Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
452 Cards in this Set
- Front
- Back
|
The __________ on the refrigeration system rejects the heat from the system. |
condenser |
|
|
The _________ on the refrigeraion system absorbs the heat from the space. |
evaporator |
|
|
The __________ is the heart of the refrigeration system. |
compressor |
|
|
The evaporator receives medium temperature __________ refrigerant. |
liquid |
|
|
R-_____ is the replacement refrigerant for R-22. |
410a |
|
|
R-123 is the replacement refrigerant for R-_______. |
11 |
|
|
A refrigeration system using R-134a is running at 345 psi on the discharge and 168 psi on the suction. What is the compression ratio of the component? |
(discharge + absolute) / (suction + absolute) = compression ratio (345+14.7) / (168+14.7) = 1.97 |
|
|
A ________ ________ air handler unit always operates at the rated capacity. |
constant volume |
|
|
A __________ _________ AHU supplies conditioned air to only one area of the building. |
single zone |
|
|
A ________ AHU has heating, and cooling coils located at the different zones. It uses air dampers from the hot and cold decks to maintain zone comfort. |
multizone |
|
|
A dual duct AHU has hot and cold ducts connected to _________ _________ at each zone. |
mixing box |
|
|
A terminal reheat AHU delivers air at constant _____ degrees. A reheat coil is connected to the thermostat to maintain comfort in the space. |
55 |
|
|
An induction AHU uses ______ _______ air flowing through the induction nozzles to draw air across the heating coil. |
high pressure |
|
|
The color of a cylinder containing R-11 is ________. |
orange |
|
|
The color of a cylinder containing R-12 is ________. |
white |
|
|
The color of a cylinder containing R-22 is ________. |
light green |
|
|
The color of a cylinder containing R-123 is _________. |
light gray |
|
|
The color of a cylinder containing R-134a is _________. |
light blue |
|
|
The color of a cylinder containing R-401a is __________. |
coral red |
|
|
The color of a cylinder containing R-410a is _________. |
rose |
|
|
What is the KVA rating for a 3-phase transformer that has rated for 600 volts and 425 amps? |
KVA= (volt * amps * 1.73) / 1000 KVA = ((600)(425)(1.73)) / 1000 441.15 KVA |
|
|
On a 4-wire delta circuit, the phase to phase voltage is 480 volts, what is the phase to neutral _____ volts? |
480 / 2 240 v |
|
|
A low-pressure steam boiler must have an ASME _____ stamp. |
H |
|
|
The ratio of the maximum fuel input rate and the minimum fuel input rate is known as the ____________ _________. |
turn-down ratio |
|
|
An 18x7x21 duplex reciprocating pump operates at 250 rpm with 9% slip. It will be able to produce _______ gallons per minute. |
gpm = LANE / 231 L= length of stroke A= area of water diameter N= number of strokes * (duplex is 2, simplex is 1) E= efficiency gpm = ((21)(7^2*.7854)(250*2)(.91)) / 231 1591.86 gpm |
|
|
The waste products from a sugar cane are used in a ________ plant. |
bagasse |
|
|
_________ BTU's are required to raise the temperature of 685 pounds of water from 40 degrees to 220 degrees F. |
BTU's = (220-40) * 685 123300 BTU's |
|
|
The expansion tank is usually installed at the _______ _______ to help remove air from the system. |
pump inlet |
|
|
The Economic boiler was an improvement on the HRT boiler. The economic boiler has more ________ ________ per square foot of floor space, it requires less _______ and is easier to _______ as a single packaged unit. |
heating surface brickwork ship |
|
|
A dry pipe on a scotch marine boiler is used to remove _____ from the steam prior to leaving the boiler. |
water |
|
|
In a positioning control system, a change in the steam pressure will result in a change to the ________ ________ damper to modulate the fuel supply to the boiler. |
forced draft |
|
|
When the pump suction is above the water level of the suction water source, a _______ valve is required to keep the suction line full of water. |
foot |
|
|
A rotary pump is a _______ displacement pump. |
positive |
|
|
________ _________ is the restriction in circulation due to a steam pocket inside the pump. |
Steam binding |
|
|
Name the 4 steps needed to perform a regeneration on a zeolite water softener. |
1. Backwash 2. Brine rinse 3. Rinse 4. Back in service |
|
|
The blowdown valve closest to the boiler is ________ first and ________ last. |
opened closed |
|
|
_________ tubes are used to protect the refractory in the boiler. |
Waterwall |
|
|
The ________ control turns the burner off when boiler steam pressure is sufficiently high and turns the burner on when steam pressure in the boiler is sufficiently low. |
operating |
|
|
There are _______ btu's per gallon of #4 fuel oil. |
146,000 |
|
|
The "Three T's" for proper fuel combustion are ________, ________, and __________. |
Time Temperature Turbulance |
|
|
City water pressure entering a building is 135 psi. The building is 175 feet tall. There is _______ psi city water pressure on the top floor of the building? |
Actual pressure = Gauge pressure - (Effective leg / 2.31) Ap = 135 - (175 / 2.31) 59.24 psi |
|
|
A reciprocating pump has a water cylinder that is 12" diameter and 16" long. The plunger in the cylinder strokes 7/8 of the length of the cylinder. What is the volume of water displaced with each stroke of the plunger? |
Volume = area of circle * length * length of stroke V = (12^2*.7854)(16)(7/8) 1583.37 in.3 |
|
|
A burner that uses a feed ram for coal is an example of an _______ stoker. |
underfeed |
|
|
A 10" pipe filled with water 192 feet high will have _______ psi on a pressure gauge located at the bottom of the pipe. |
Feet of Head = Gauge pressure * 2.31 192 = gp * 2.31 192 / 2.31 = gp 83.12 psi |
|
|
The accumulation of ______ on the waterside of the boiler leads to overheating and possible sagging and loosening in the tubesheet. |
scale |
|
|
An obstruction in the ________ _______ to the water column will cause a slow rising water level in the gauge glass after a gauge glass blowdown. |
bottom connection |
|
|
The first thing that should be done on a loss of visible water level on the boiler is to ___________ the _________ to the burner. |
shut-off fuel |
|
|
The ________ ________ burner can burn almost any fuel oil, at almost any temperature. |
steam atomizing |
|
|
__________ coal burns with a yellow, smoky flame. |
Bituminous |
|
|
Testing coal for moisture, percent volatile matter, fixed carbon, and ash content is a _________ _________. |
proximate analysis |
|
|
The two methods for determining the grindability of coal are ______-______ and ________ test. |
ball-mill hardgrove |
|
|
Number 4, 5, and 6 fuel oils are heavy and viscous, thus require ________ prior to being sprayed into a furnace. |
heating |
|
|
Coal gas is produced using the volatile matter from _________ coal and has a heating value of ______ btu's per cubic foot. |
bituminous 550 |
|
|
The safety valve on the ________ should always be set at a lower pressure than the ______ safety valve to always ensure steam flow through the superheater. |
superheater drum |
|
|
The presence of scale on the boiler tubes will result in a ________ in the boiler's efficiency, and an ________ in the temperature on the boiler tubes. |
decrease increase |
|
|
To internally remove oxygen from the boiler, __________ ________ is used. |
sodium sulfite |
|
|
Water hammer is caused by quickly opening a _________ ________. The sudden change in pressure and temperature on the connected piping may cause vibration, noise, or even pipe rupture. |
steam valve |
|
|
For a company to make qualified repairs to a safety valve they must have a _____ stamp. |
VR |
|
|
If a boiler is rated for 20,500,000 BTU's per hour, what is the equivalent boiler horsepower? |
Hp = 20,500,000 / 33,475 612.4 hp |
|
|
If a boiler is rated for 67,000 pounds of steam per hour, what is the equivalent boiler horsepower? |
Hp = 67,000 / 34.5 1942.03 hp |
|
|
140F = C |
F = (C * 1.8) + 32 (F-32) / 1.8 = C (140 - 32) / 1.8 = 60 degrees C |
|
|
78C = F |
F = (C * 1.8) + 32 F = (78 * 1.8) + 32
172.4 degrees F |
|
|
In conduction the transfer of heat from one material to another occurs due to direct _________. |
contact |
|
|
__________ is the transfer of heat from a liquid flowing over the surface of a body. |
Convection |
|
|
On order for a Black Liquor boiler to sustain combustion, the liquor must contain over _____% solids. |
58 |
|
|
The flow of heat through electromagnetic waves is known as ___________. |
radiation |
|
|
A power boiler is steam boiler that operates at pressures greater than _____ psi, or a hot water boiler that operates above ________ or ________. |
15 160 psi 250 degreeF |
|
|
What is the popping pressure required to lift a 2.5" pressure relief valve with a spring pressure of 16,500 lbs? |
Total force = Area * Pressure Total force / Area = Pressure 16,500 / (2.5^2*.7854) = p 3361.34 psi |
|
|
What is the maximum pressure that a 24x16x15 duplex reciprocating pump can develop when operating with 175 psi steam? |
Total force of water = Total force of steam (16^2*.7854) p = (24^2*.7854)(175) p = (24^2*.7854*175) / (16^2*.7854) 393.75 psi |
|
|
The general classification of superheaters includes _______ and __________ types, depending on where the heat is absorbed. |
radiant convection |
|
|
________ ________ boilers recover the heat in the exhaust from a gas turbine to produce useful steam. |
Waste heat |
|
|
Infrared flame scanners use a ________ ________ cell to detect the presence of the flame. |
lead sulfide |
|
|
The Low Water Fuel Cut-off will shut off the fuel to the burner before the water drops below the safe permissible level, and thus prevent _______ damage to the boiler. |
overheating |
|
|
A _________ boiler inspection should be performed six months after the internal boiler inspection on power boilers. |
external |
|
|
Cooling of flue gases below approximately 325F can cause ________ of the water in the flue gases. |
condensation |
|
|
A device used to reduce the temperature of superheated steam to a lower desired temperature is a __________. |
desuperheater |
|
|
Unlike an infrared scanner, the ultraviolet scanner is not affected by the light given off by hot _________. |
refractories |
|
|
________ _________ are used extensively in pulverized-fuel-burning plants to keep heat-absorbing surfaces free from soot and ash buildup. |
Soot blowers |
|
|
Permanent hard water is water that contains large quantities of calcium and magnesium _________. |
sulfates |
|
|
Temporary hard water is water that contains large quantities of calcium and magnesium __________. |
bicarbonates |
|
|
Too much _____ causes dense white smoke. |
air |
|
|
The flow rate, in gallons per minute, through a 6" pipe with a velocity of 9 feet per second is ______gpm. |
gpm = (velocity * diameter^2) / .4085 gpm = (9*36) / .4085 793.15 gpm |
|
|
Galvanic corrosion occurs when two _________ metals are in direct contact with each other in a _________ environment. |
dissimilar conductive |
|
|
A boiler horsepower is the evaporation into dry saturated steam of _______ pounds per hour from and at 212F. |
34.5 |
|
|
The operation of a black liquor boiler is known for its _________ _________, and recovery of _______ _______. |
steam generation soda ash |
|
|
Leaking safety valves should be _______ to stop the leakage, never _______ by adjustment to stop the leakage. |
reground tightened |
|
|
The maximum adjustment to the setpoint of a safety valve is ____ percent. |
10 |
|
|
The modulating control controls the _________ _______ of the burner. |
firing rate |
|
|
The last form of over-pressure protection on the boiler, prior to lifting the safety valve is the ________ ________ ________. |
high limit control |
|
|
Butane and propane are produced from the manufacturing of ________. Propane has a heating value of ________btu's per cubic foot. Butane has a heating value of about _______ btu's per cubic foot. |
gasoline 2500 3200 |
|
|
Steam atomization typically consumes about ______ percent of the steam produced by the boiler. |
2 |
|
|
The lowest temperature at which fuel oil will flow is the _______ ______. |
pour point |
|
|
________ ________ is the temperature at which fuel oil will give off a vapor that will ignite when exposed to an open flame. |
Flash point |
|
|
__________ is the amount of pressure below the setpoint that must be relieved before the safety valve closes. |
Blowback |
|
|
The temperature of a liquid minus 32 is the _________ of the liquid. |
enthalpy |
|
|
The type of fuel gas with the lowest btu content is ________ ________ gas with about 90 btu's per ft3. |
blast furnace |
|
|
Operating a boiler at temperatures 10F to 20F above the design temperatures for long periods of time can cause a life reduction of ______ to _______ years. |
10 20 |
|
|
The National Board of Boiler and Pressure Vessel Repair requires a _____ stamp for companies that repair boilers. |
R |
|
|
Rectifying phototube and cadmium sulfide phototube both prove flame in the boiler by sensing _______ _______. |
visible light |
|
|
Welding a flat strip of metal between the waterwall tubes is known as ________ wall construction. |
membrane |
|
|
The ratio of the boiler's heat output to its heat input is ________ ________. |
boiler efficiency |
|
|
In lieu of a stop valve a _________ _______ may be used instead of the stop valve _______ to the boiler. |
non-return valve closest |
|
|
A three element feedwater regulator senses ________ _______, ________ _______, and _______ ________. |
water level steam flow feedwater flow |
|
|
The maximum voltage allowable on a control circuit is ______ volts. |
150 |
|
|
A __________ is a gelatin like substance that has very small particles in suspension. These particles are usually less than _____ microns in size. |
colloidal .2 |
|
|
_________ valves are not allowed to be blowdown valves. |
Globe |
|
|
The percentage of excess air required to burn coal is about _____ percent. |
50 |
|
|
A 600 psi superheated steam boiler produces 175,000 pounds of steam per hour. The minimum pipe size for the pipe leaving the boiler is ______ inches. (Density is 1.14 lbs./ft3) |
D = 12 SqRt C / .7854*F C = (lbs of steam per hour / Density) / 60 C = (175,000 / 1.14) / 60 C = 2558.48 F = 14,000 D = 12 SqRt (2558.48 / (.7854*14,000)) D = 5.79" 6" |
|
|
The minimum size of the piping between the boiler and the water column is _____. |
1" |
|
|
Prior to entering a confined space, the minimum amount of oxygen in the space ______ percent. |
19 |
|
|
__________ _________ may be caused by an accumulation of unburned combustibles igniting spontaneously. |
Furnace explosion |
|
|
A ________ is caused by a slag inclusion forming a lamination at the time the plate was rolled. |
blister |
|
|
A supercritical boiler is a boiler that operates in excess of ________ or ________. |
3206 psia 705 degree F |
|
|
Pressure relief valve on a hot water boiler must be at least ______ diameter and not more than _____ diameter. |
3/4" 4 1/2" |
|
|
The ________ ________ mechanism on the high limit control calls attention if the _________ control has malfunctioned. |
manual reset operating |
|
|
The accumulation of carbon dioxide in the condensate system produces _________ ______, which attacks and corrodes steam metal piping. |
carbonic acid |
|
|
What is the total force acting on a 1 1/4" pressure relief valve with a popping pressure of 250 psi? |
Total force = area * pressure Tf = (1.25^2*.7854)(250) 306.8 lbs |
|
|
A pump moving 125 gpm of water to a height of 140 feet with an operating efficiency of 85% will require ________ horsepower. |
Horsepower = (gpm*8.33*height*specific gravity) / 33,000*efficiency Hp = (125*8.33*140*1) / (33,000*.85) 5.2 hp |
|
|
A temperature sensor that measures the resistance of a platinum wire at different temperatures is a _________ ________ ________. |
resistance temperature detector |
|
|
ASME code requires all boiler safety valves be stamped with a _____ stamp. |
V |
|
|
The percentage of excess air required to burn natural gas, fuel oil, or pulverized coal is _____ to ______ percent. |
10 30 |
|
|
The safety valve capacity must be sufficient to relieve all the steam that the boiler can generate at the _________ ________ ________ without allowing the pressure to rise more than ______ percent above the maximum allowable working pressure. |
maximum firing rate 6 |
|
|
If the analysis of the boiler water indicated 130 ppm of calcium and 85 ppm of magnesium, what is the total hardness? |
Total hardness = (calcium * 2.5) + (magnesium * 4.1) Th = (130 * 2.5) + ( 85 * 4.1) 673.5 ppm |
|
|
A 3" pressure reducing valve has 1 1/2" bypass line. The inlet pressure is 125 psi, and the outlet pressure is 5 psi. The safety valve on the discharge should be rated for ______ pounds per hour. Where: OC = 7,200 PPH, VSPA = 7.39, BPA = 1.5 |
Reducing Valve Capacity = 1/3 * Orifice Capacity * Valve Size Pipe Area Reducing Valve Capacity = 1/2 * Orifice Capacity * Bypass Pipe Area RVC = 1/3 * 7,200 * 7.39 17,736pph RVC = 1/2 * 7,200 * 1.5 5400pph 17,736 PPH |
|
|
The device that allows for greater surface area for the steam to act upon, thus creating a popping action is called a _________ _________. |
huddling chamber |
|
|
A slow opening blowdown valve must complete _____ turns between full open and full shut. |
5 |
|
|
When the protective coating on metal is removes by rubbing with another metal object, thus causing new oxidation, it is called __________ _________. |
fretting corrosion |
|
|
A temperature increases of ______ can reduce the expected creep life from 40 years to 4 to 8 years. |
50 degree F |
|
|
The minimum size for the connection between the gauge glass and the water column is ______. |
1/2" |
|
|
If the boiler is susceptible to freezing, ______ lay-up should be used. |
dry |
|
#151 The picture is an example of a _________ type safety valve. |
nozzle |
|
|
A 20"x32" rectangular duct is replaced with a round duct. What is the minimum diameter of the round duct to provide the same cross-sectional area? |
Area of rectangle = Area of circle base * height = diameter^2 * .7854 20*32 = d^2 * .7854 (20*32) / .7854 = d^2 SqRt ((20*32) / .7854) = d 28.55" |
|
|
A boiler is operating with 87% condensate return and is producing 75,000 pounds of steam per hour. The desired conductivity in the boiler is 3500 PPM and the make-up water contains 280 PPM. What is the percent of blowdown and the amount of blowdown needed? |
Percent Blowdown = Make-up conductivity / desired conductivity %BD = 280 / 3500 %BD = .08 = 8% Make-up + Condensate Return = Evaporation Rate + %BD Make-up M + (.87*75,000) = 75,000 + .08M .92M = 9750 M = 9750 / .92 M = 10597.83 %BD*M= amount of blowdown needed .08*10597.83 847.83 8% 847.83 pph |
|
|
The chief heat producing elements in fuels are ________, __________, and _________. |
carbon hydrogen sulfur |
|
|
Anthracite coal is very hard, has the highest percentage of _______ _______. |
fixed carbon |
|
|
__________ amines are used in boiler water systems with low make-up water flow, low alkalinity, and good oxygen level controls. |
Neutralizing |
|
|
A _________ pump can be started with the discharge valve shut. |
centrifugal |
|
|
A 600 horsepower boiler is operating at 15 psi. The boiler burners 22,900 ft3 per hour of natural gas containing 975 btu's per ft3. The chimney receives 10,750 pph of flue gas containing 450 btu's per pound. What is the boiler efficiency through the indirect method? |
Boiler efficiency = ((Input - losses) / Input) * 100 Input = burners ft3 per hour * btu's per ft3 losses = chimney pph * btu's per pound
Be = ((22,900*975) - (10,750*450)) / (22,900*975) * 100
78.33% |
|
|
Leakage that occurs inside a centrifugal pump, from the discharge to the suction, is known as _________. |
slip |
|
|
When performing an evaporation test on the low water cut off, _________ is secured to the boiler. |
feedwater |
|
|
A ________ valve is best used for throttling purposes. |
globe |
|
|
A _________ valve is used to blank off and bring it back on-line without using a shut off valve. |
non-return |
|
|
A ________ draft gauge uses a U-tube to measure the differential pressure between two points. |
manometer |
|
|
An _______ ________ mounted on the water column will sound an alarm if the water level is too high or too low. |
alarm whistle |
|
|
The presence of free oxygen in the boiler water will produce _______ attack on the boiler metal surfaces. |
pitting |
|
|
________ are added to the boiler to prevent steam line and condensate line corrosion. These chemicals are used because they will boil-off with the steam. |
Amines |
|
|
Firetube boiler tubes are likely to leak due to cracking, burning, and corrosion of the _________ _______. |
tube ends |
|
|
__________ is when water or impurities leave the boiler with the steam. |
Carryover |
|
|
One grain is equal to ______ parts per million. ________ grains equal one pound. |
17.1 7000 |
|
|
Light domestic fuel oil is known as number _______ ________ ________. |
1 fuel oil |
|
|
The bottom blowdown on a boiler ____. a. removes sludge and sediment from the mud drum b. reduces boiler steam pressure c. adds makeup water to the boiler d. increases |
a |
|
|
In a ____ boiler, the water circulates inside tubes that are surrounded by flue gases and the products of combustion. a. cast iron b. electric c. firetube d. watertube |
d |
|
|
A _____ is a system programmed for automatic burner sequencing and flame supervision. a. high-limit control b. burner management system c. modulating control d. flame sensor |
b |
|
|
Spalling in a boiler refers to ____. a. hairline cracks in the steam drum b. hairline cracks in the refractory c. slugs of water in the steam d. water in the fuel oil |
b |
|
|
Boiler horsepower is the evaporation of ____ lb/hr of water from and at a feedwater temperature of 212F. a. 34.5 b. 180 c. 345 d. 970.3 |
a |
|
|
A siphon installed between the boiler and the pressure gauge protects the Bourdon tube from _____. a. water b. the gases of combustion c. steam temperature d. steam pressure |
c |
|
|
The pH of the boiler water should have a ____pH. a. acid b. neutral c. alkaline d. low |
c |
|
|
The boiler superheater raises the temperature of the ______. a. feedwater b. gases of combustion c. air for combustion d. steam leaving the boiler |
d |
|
|
An economizer is used to preheat ____. a. air for combustion b. fuel oil c. feedwater d. coal |
c |
|
|
Fires caused by spontaneous combustion would probably start in the ____. a. fuel oil tank b. oily waste rag storage c. boiler firebox d. boiler ash pit |
b |
|
|
A high suction reading on the fuel oil pressure gauge indicates______. a. dirty strainers b. a high tank temperature c. dirty burners d. leaky pump packing |
a |
|
|
The automatic nonreturn valve should be opened during startup when the steam pressure on a boiler reaches ____. a. the line pressure b. 75% to 85% of the line pressure c. 5 lb to 10 lb above line pressure d. 5 lb to 10 lb below line pressure |
b. |
|
|
A _____ is used to measure furnace temperature. a. mercury thermometer b. pyrometer c. oxygen analyzer d. pressure gauge |
b |
|
|
The range of a boiler pressure gauge must not be less than _____ times the safety valve setting. a. 1 1/2 b. 2 c. 2 1/2 d. 3 |
a |
|
|
Boiler feedwater is chemically treated to ____. a. increase circulation in the boiler b. increase oxygen concentration c. prevent formation of scale d. increase boiler makeup water |
c |
|
|
The ______ opens when the gas pressure drops below a preselected minimum requirement, deenergizes the main gas valve, and energizes the vent valve. a. safety relief valve b. main gas valve c. high-gas-pressure switch d. low-gas-pressure switch |
d |
|
|
In a firetube boiler, soot settles on the _____. a. inside tube surface b. outside tube surface c. waterwall surface d. lowest part of the water side |
a |
|
|
Carbon dioxide in the flue gas is a sign of ____ combustion. a. imperfect b. complete c. incomplete d. half-complete |
b |
|
|
A manometer measures _____. a. flue gas temperature b. volume of airflow c. atmospheric pressure d. difference in pressure between two points |
d |
|
|
____ lay-up is the storage of a boiler with all water drained. a. dry b. evaporative c. hydrostaic d. pressurized |
a |
|
|
The main purpose of conducting a _____ test is to verify the strength of the boiler shell and any parts under pressure. a. condensation b. evaporation c. hydrostatic d. try lever |
c |
|
|
The pressure applied on the boiler during a hydrostatic test is ______ times the MAWP. a. 1 1/2 b. 2 c. 2 1/2 d. 3 |
a |
|
|
Boiler safety valve capacity must be such that the steam pressure can never go higher than _____% above the MAWP. a. 2 b. 4 c. 6 d. 10 |
c |
|
|
As fuel oil is heated, its viscosity _____. a. stays the same b. increases c. decreases d. ignites |
c |
|
|
No. ____ fuel oil has the highest Btu content per gallon. a. 1 b. 2 c. 4 d. 6 |
d |
|
|
All steam boilers must have one or more safety valves. T or F |
T |
|
|
An open feedwater heater vents gases to the atmosphere. T or F |
T |
|
|
A hydrostatic test will determine whether a steam boiler has sufficient relieving capacity. T or F |
F |
|
|
When boilers are set in battery, the main steam stop valves, bottom blowdown valves, and feedwater valves should be locked closed before anyone enters the boiler drums. T or F |
T |
|
|
A programmer is a boiler system that modulates the flow of air to and from a burner. T or F |
F |
|
|
In an open feedwater heater, the water and steam come into direct contact. T or F |
T |
|
|
An economizer is a fuel-saving device that reclaims heat from the gases of combustion. T or F |
T |
|
|
Soot accumulation on the tubes of a watertube boiler does not affect the efficiency of the boiler. T or F |
F |
|
|
Scale protects the boiler heating surfaces. T or F |
F |
|
|
Boiler corrosion cannot be prevented as long as water is in contact with metal. T or F |
F |
|
|
Priming can cause water hammer. T or F |
T |
|
|
Dry saturated steam is in a gaseous state. T or F |
T |
|
|
Pressure on water does not change the boiling point of the water. T or F |
F |
|
|
During cold startup, a boiler must be warmed slowly to prevent uneven expansion of the boiler and piping. T or F |
T |
|
|
The primary function of a gas solenoid valve is to shut down the burner if the water level drops below a safe operating level. T or F |
F |
|
|
The interior of the Bourdon tube in a steam pressure gauge is always filled with live steam when it is operating. T or F |
F |
|
|
Safety valves on superheaters should be set to open before main safety valves on boilers. T or F |
T |
|
|
An operating pressure control shuts down the burner when the steam pressure increases to the setpoint. T or F |
T |
|
|
Waterwalls permit greater heat absorption per cubic foot of furnace volume than refractory walls. T or F |
T |
|
|
A steam trap is a device that removes air and condensate without loss of steam. T or F |
T |
|
|
Steam traps are only used on high-temperature hot water systems. T or F |
F |
|
|
Steam traps are used wherever condensate collects. T or F |
T |
|
|
A boiler feedwater pump cannot become steambound. T or F |
F |
|
|
In both firetube and watertube boilers, the hot gases of combustion are inside the tubes. T or F |
F |
|
|
Foaming can lead to carryover. T or F |
T |
|
|
_____ makes a pop-type safety valve pop open. a. Steam entering the huddling chamber exposing a larger area for the steam pressure to act on b. Weakening of the spring by the steam entering the valve c. The momentum of the steam through the valve into the huddling chamber d. Increasing steam temperature |
a |
|
|
Manual testing of the safety valve is accomplished by ______. a. removing and sending it out to a repair shop to have it tested b. closing the main steam stop valve and letting the pressure build to its setpoint c. pulling the test lever by hand and then releasing it to allow it to snap closed d. securing the feedwater to allow the water level to fall below the NOWL |
c |
|
|
A _____ prevents fuel from entering the furnace of the boiler and building up when the burner is not lit. a. low-water fuel cutoff b. operating control c. safety valve d. flame scanner |
d |
|
|
To ensure good heat transfer in a watertube boiler, the outside of the tubes are kept clean by ______. a. soot blowers b. cold lime water softeners c. ion-exchange water softeners d. bottom and continuous blowdown |
a |
|
|
When beginning a bottom blowdown, it is important to _____. a. measure the total dissolved solids b. maintain the water at the NOWL c. measure the feedwater temperature d. set the burner on high fire |
b |
|
|
When economizers are used to heat boiler feedwater, every 10F rise in feedwater temperature is accompanied by a _____% savings in fuel. a. 1 b. 10 c. 25 d. 50 |
a |
|
|
Proper safety procedure requires that _____ before anyone is allowed to enter the steam drum. a. safety valves be tagged b. the inspector be notified c. a safety light be made available d. the boiler be properly locked out |
d |
|
|
Impulse steam turbines use _____ as a force acting in a forward direction on a blade or on a bucket mounted on a wheel. a. saturated steam b. low-quality steam c. deaerated feedwater d. steam velocity |
d |
|
|
The _____ must be tested when the boiler is on-line. a. combustion air proving switch b. oil drawer proving switch c. safety valve d. low-gas-pressure switch |
c |
|
|
The induced draft fan is located between the _____ and ______. a. feedwater pump; heater b. first pass; heater c. boiler; economizer d. boiler; stack |
d |
|
|
The flash point of fuel oil is the minimum temperature at which the fuel oil will _____. a. support combustion b. flash and no longer flow c. flash when exposed to an open flame d. have its highest Btu content |
c |
|
|
The fire point of fuel oil is the minimum temperature at which the fuel oil will _____. a. burn continually b. no longer flow c. flash when exposed to an open flame d. have its highest Btu content |
a |
|
|
The pour point of fuel oil is the ______ temperature at which fuel oil will _____. a. lowest; burn b. lowest; flow c. highest; burn d. highest; flow |
b |
|
|
Fuel oil with a low flash point is _____. a. used with high pressure boilers b. dangerous to handle c. only used in low pressure plants d. heated to increase its viscosity |
b |
|
|
_____ dioxide is major source of air pollution and is caused by burning fuel oil. a. Nitrous b. Vanadium c. Hydrogen d. Sulfur |
d |
|
|
In a closed feedwater heater, the steam and water ______. a. do not come into direct contact b. only mix on the discharge side c. only mix on the feedwater side d. are not used at the same time |
a |
|
|
The operating range of a steam boiler is controlled by a ____. a. operating pressure control b. airflow interlock c. scanner d. program clock |
a |
|
|
Water hammer in steam lines is caused by ______. a. low steam pressure b. high steam pressure c. condensation in the line b. a sudden drop in plant load |
c |
|
|
Carbon monoxide in the flue gas is a sign of _____ combustion. a. perfect b. complete c. incomplete d. half-complete |
c |
|
|
A ____ area is a location where Class A and Class B flammables exceed those expected in ordinary hazard areas. a. extra hazard b. combustibles c. flammable d. fire prevention |
a |
|
|
In boiler room work, HRT means ______. a. highly regulated therm b. high return tubular c. hot return tubular d. horizontal return tubular |
d |
|
|
The safety valves on a boiler drum and superheater safety valves of a steam boiler are set so that _____. a. both drum safety valves open together b. only one drum safety valve opens c. the superheater safety valve opens first d. one drum safety valve opens and then the superheater safety valve opens |
c |
|
|
The best time to blow down a boiler is when it is ______. a. at its peak load b. at 75% of its peak load c. at its lightest load d. being taken out of service |
c |
|
|
The frequency of blowing down a boiler can best be determined by ______. a. the boiler operator b. the boiler inspector c. the blowdown flow meter d. a boiler water analysis |
d |
|
|
In most plants, the suggested operating procedure is to blow down the water column and gauge glass ______. a. at least once a week b. at least once a shift c. only when taking the boiler off-line d. except when the boiler is under pressure |
b |
|
|
Sodium sulfite is used in boiler water to prevent pitting of the boiler metal. T or F |
t |
|
|
An airtight boiler room does not allow enough air for complete combustion. T or F |
t |
|
|
If the top line to a boiler gauge glass were closed, the water in the glass would rise to the top. T or F |
t |
|
|
The boiling point of water is not affected by boiler pressure. T or F |
F |
|
|
Priming can be a direct result of maintaining too high a water level in the boiler. T or F |
T |
|
|
In a closed feedwater heater, steam and water come into direct contact with each other. T or F |
F |
|
|
The automatic nonreturn valve is on the main steam line. T or F |
T |
|
|
An atomizing burner can be designed to use steam to atomize fuel oil. T or F |
T |
|
|
A combustible material is any material that burns when it is exposed to oxygen and heat. T or F |
T |
|
|
A high-pressure cutoff control can take the place of a safety valve. T or F |
F |
|
|
Both stop and check valves must be installed on the boiler feedwater line. T or F |
T |
|
|
Try cocks on a water column can be used to determine the water level if the gauge glass is broken. T or F |
T |
|
|
Boiler explosions would not occur if all boilers had an MAWP of 15 psi. T or F |
F |
|
|
The purpose of safety valves is to protect the boiler from exceeding its MAWP. T or F |
T |
|
|
The duty rating of a boiler is the ratio of the heat absorbed by the boiler (output) to the heat available in the fuel (input). T or F |
F |
|
|
An energy audit of a facility identifies how energy is used in a facility and recommends ways to improve energy efficiency and reduce energy costs. T or F |
T |
|
|
The low-water fuel cutoff shuts down the burner when the steam pressure increases above the setpoint of the operating pressure control. T or F |
F |
|
|
In a pop-type safety valve, the huddling chamber assists in opening the valve. T or F |
T |
|
|
If a safety valve leaks after testing, the valve should be opened again using the test lever. T or F |
T |
|
|
The low-water fuel cutoff control shuts off the fuel to a burner when a low-water condition occurs. T or F |
F |
|
|
A low-water fuel cutoff control should be tested by blowing down the float chamber at least once a shift. T or F |
T |
|
|
The water column reduces the turbulence of the water to give a more accurate reading of the water level. T or F |
T |
|
|
Boiler blowdown tanks do not require vents because the water is discharged to the sewer. T or F |
F |
|
|
A false water level reading can occur if the water column or gauge glass blowdown valves are not fully closed. T or F |
T |
|
|
Boilers that are laid up dry have trays of ______ put in the steam drums to absorb moisture. a. sodium chloride b. hot soda lime c. silica gel d. potash |
c |
|
|
To obtain complete combustion of a fuel ______ are required. a. mixture, atomization, temperature, and time b. CO2, O2, CO, and CO3 c. turbulence, feedwater, air, and flue gas d. hot refractory, air, draft, and gases of combustion |
a |
|
|
Oxygen in the boiler causes ____. a. scale b. pitting c. foaming d. carryover |
b |
|
|
A ____ valve is a manual valve that is typically used to isolate the feedwater to the boiler or the steam discharge from the boiler. a. pressure-reducing b. low-water c. relief d. stop |
d |
|
|
Scale buildup in the tubes of a watertube boiler can be removed by _____. a. washing down the boiler with high pressure water b. a steam-driven or water-driven turbine c. wire brushes d. boiling out the boiler with caustic soda |
b |
|
|
When no boiler water analysis is made, the boiler should be blown down at least once ____. a. every 8 hours b. every 24 hours c. a week d. a month |
b |
|
|
When the boiler low-water alarm is sounding, the operator should _____. a. call the chief engineer b. increase the firing rate c. decrease the draft d. secure the fuel |
d |
|
|
A 3/4" blowdown line may be used if the boiler has _____sq ft of heating surface. a. more than 100 b. no more than 100 c. less than 199 d. more than 500 |
b |
|
|
A superheater drain _____ the superheater during startup and shutdown. a. removes gases from b. removes pressure from c. establishes airflow through d. establishes steam flow through |
d |
|
|
An infrared sensor _____. a. can be used as a flame scanner b. detects smoke c. measures pressure d. prevents low water |
a |
|
|
A furnace explosion can be prevented by _____. a. checking the water level once a shift b. testing the safety valves once a month c. purging after ignition failure d. testing the safety valve regularly |
c |
|
|
The bottom blowdown valve located farthest from a boiler is always a ____ valve. a. quick-opening b. slow-opening c. check d. sealing |
b |
|
|
A lead sulfide cell, which can be used for flame detection, is sensitive to ______. a. infrared light b. light c. heat d. temperature increases |
a |
|
|
An economizer heats ______. a. steam b. air for combustion c. fuel oil d. feedwater |
d |
|
|
A combustion air proving switch verifies that there is sufficient ______. a. gas flow at the pilot b. air for combustion c. steam flow d. fuel oil pressure |
b |
|
|
The Btu content of natural gas is _____ Btu per ______. a. 100,000; therm b. 100,000; cubic foot c. 152,000; therm d. 152,000; cubic foot |
a |
|
|
Chemicals are added to boiler water by _____. a. the feedwater pump b. the vacuum pump c. the proportional chemical pump d. mixing in the reservoir |
c |
|
|
The boiler feedwater stop valve is between the boiler and the _____. a. check valve b. feedwater pump c. feedwater control valve d. main header |
a |
|
|
A pop-type safety valve is a _____ type of safety valve. a. counterweighted b. pin and disc c. deadweight d. spring-loaded |
d |
|
|
An economizer is used to heat feedwater before it enters a boiler by using _____. a. a gas fired preheater b. exhaust steam from a turbine c. exhaust gases from a gas or diesel engine d. gases of combustion as they leave the boiler |
d |
|
|
Tubes in a firetube boiler are ______. a. rolled and beaded b. welded c. collared and peened d. bolted and nutted |
a |
|
|
When burning fuel oil with a firetube boiler, soot can settle on the ______. a. stays b. waterwalls c. outside tube surface d. inside tube surface |
d |
|
|
Pressure gauges are calibrated with a _____. a. pyrometer b. Orsat analyzer c. lightweight tester d. electronic calibrator |
d |
|
|
To test a low-water fuel cutoff using an evaporation test, the boiler operator must ______. a. open the feedwater stop valve b. secure all of the feedwater going to the boiler c. completely drain the regulator chamber d. have an inspector on hand |
b |
|
|
A blowdown flash tank _____. a. acts as a separator b. recovers condensate c. controls blowdowns d. recovers low-pressure steam |
d |
|
|
A closed boiler room that does not permit the proper flow of outside air to the furnace will experience combustion problems. T or F |
T |
|
|
All firetube boilers are horizontal boilers. T or F |
F |
|
|
Weighted lever-type safety valves can be used on steam boilers that operate at pressures not exceeding 50 psi. T or F |
F |
|
|
Steam boilers that are out of service can be laid up wet or dry. T or F |
T |
|
|
The dry method of boiler lay-up requires the boiler to be opened and air to be circulated to keep the boiler drums and tubes open to the air. T or F |
F |
|
|
Chemical treatment of the boiler water is not necessary when laying a boiler up wet if the water has been deaerated. T or F |
F |
|
|
A flash point is the lowest temperature at which the vapor of a fuel oil ignites when exposed to an open flame. T or F |
T |
|
|
The fire point of fuel oil is the minimum temperature at which the fuel oil burns continuously. T or F |
T |
|
|
No. 6 fuel oil burns with a clean flame when it is not heated. T or F |
F |
|
|
Poor grades of No. 6 fuel oil can be used quite well with a steam atomizing burner. T or F |
F |
|
|
A check valve is a manual valve that is typically used to isolate the feedwater to the boiler or the steam discharge from the boiler. T or F |
F |
|
|
A steam pressure gauge is typically calibrated in pounds per square foot. T or F |
F |
|
|
The Bourdon tube of a steam pressure gauge has to be protected from the pressure. T or F |
F |
|
|
The presence of soot on the heating surfaces of a boiler increases efficiency. T or F |
F |
|
|
Gauge pressure is pressure below atmospheric pressure. T or F |
F |
|
|
A dry pipe separator is in a steam drum. T or F |
T |
|
|
A dry pipe separator increases the quality of steam leaving a steam boiler. T or F |
T |
|
|
Excess air for combustion is indicated by testing for CO2 in the gases of combustion. T or F |
F |
|
|
A change in steam pressure will change the boiling point of water. T or F |
T |
|
|
Boiler tube dimensions are based on the inside diameter of the tube. T or F |
F |
|
|
The safety valve on a superheater header should be set to a lower popping pressure than the safety valve on the steam drum. T or F |
T |
|
|
A globe valve offers less resistance to flow than a gate valve. T or F |
F |
|
|
To control the flow of steam, a gate valve is opened halfway. T or F |
F |
|
|
A large heat loss in a boiler is caused by heat being carried with the gases of combustion to the atmosphere. T or F |
T |
|
|
The bottom blowdown valves can be used to lower the boiler steam pressure. T or F |
F |
|
|
In a rotary cup burner, atomization is achieved by ___. a. fuel oil pressure b. air pressure c. the pressurized burner d. the rotary cup and primary air |
d |
|
|
To prevent a vacuum from forming on a boiler that is coming off-line, the _____. a. boiler vent should be opened b. boiler should be blown down c. boiler should be dumped d. safety valve should be opened |
a |
|
|
The _____ is a law that was passed to allow for monitoring and controlling environmental air emissions. a. Ozone Emissions Act (OEA) b. Clean Air Act (CAA) c. New Source Performance Standards (NSPS) d. Particulate Matter Plan (PMP) |
b |
|
|
When warming up a boiler during cold plant startup, the ___ should remain open until the steam pressure reaches approximately 10 psi to 25 psi. a. safety valve b. boiler vent c. nonreturn valve d. breeching damper |
b |
|
|
High pressure boilers equipped with quick-opening and slow-opening valves are blown down by opening the _____ valve first and closing it _____. a. quick-opening; last b. slow-opening; last c. quick-opening; first d. slow-opening; first |
a |
|
|
____ are designed to collect condensate from the steam system so that it can be returned to the boiler through the condensate return tank. a. Flash tanks b. Steam traps c. Bottom blowdown lines d. Safety valves |
b |
|
|
To ensure good heat transfer in a firetube boiler, the outside of the tubes are kept clean by ____. a. soot blowers b. recommended feedwater treatment c. daily surface blowdowns d. overfire air |
b |
|
|
The viscosity of fuel oil is the measurement of the _____ in the fuel oil. a. Btu content b. fire point c. flash point d. internal resistance to flow |
d |
|
|
The maximum size of a boiler bottom blowdown line is ______". a. 1 1/2 b. 2 c. 2 1/2 d. 3 |
c |
|
|
A ___ valve is a manual valve that is typically used to isolate the feedwater to the boiler or the steam discharge from the boiler. a. pressure-reducing b. low-water c. relief d. stop |
d |
|
|
Any repairs done on a boiler safety valve must be done by a ___. a. boiler inspector b. qualified repair technician c. watch engineer d. shift engineer |
b |
|
|
Feedwater is treated chemically before it enters the boiler to _____. a. prevent foaming b. eliminate blowing down the boiler c. allow more frequent blowdown d. reduce the boiling temperature |
a |
|
|
Soot blowers are most commonly found _____. a. on an HRT boiler b. on a watertube boiler c. in main breeching d. on vertical firetube boilers over 150 HP |
b |
|
|
In a furnace, the amount of NOx decreases as the _____. a. combustion air flow decreases b. amount of FGR decreases c. combustion temperature decreases d. combustion temperature increases |
c |
|
|
In a furnace, the amount of NOx decreases as the _____. a. combustion air flow decreases b. amount of FGR decreases c. combustion temperature decreases d. combustion temperature increases |
c |
|
|
Complete combustion is defined as burning all fuel using ____. a. the theoretical amount of air b. the minimum amount of excess air c. no excess air d. CO2 and CO |
b |
|
|
When testing a safety valve by hand, _____. a. there should be no pressure in the boiler b. notify the boiler inspector c. the boiler should have a pressure of at least 75% of the popping pressure d. first secure the fires |
c |
|
|
The absolute pressure of a steam boiler at 160 psig would be ___ psia. a. 145.3 b. 174.7 c. 200 d. 320 |
b |
|
|
The ____ analysis test is used to test the density of smoke leaving a boiler. a. proximate b. opacity c. Orsat d. Fyrite |
b |
|
|
An automatic nonreturn valve is found on the ____. a. discharge side of the feedwater pump b. inlet line to the open feedwater heater c. boiler main steam line between the main stop valve and the header d. boiler main steam line between the boiler and the main stop valve |
d |
|
|
A boiler steam pressure of 100 psi with a temperature of 500F indicates _____. a. dry steam b. supersaturated steam c. superheated steam d. steam at its corresponding pressure and temperature |
c |
|
|
A ____ regulates fuel supply, air supply, air-fuel ratio, and draft in a boiler in order to deliver the required amount of steam to a load. a. programmer b. firing-sequence controller c.. flame scanner d. combustion control system |
d |
|
|
To aid in the delivery of moisture-free steam, the steam leaves the steam drum through the ____. a. dry pipe b. surface blowdown valve c. desuperheater d. internal feedwater pipe |
a |
|
|
A broken baffle in a watertube boiler causes ____. a. smoke to come from the stack b. a rise in stack temperature c. a drop in stack temperature d. steam to come from the stack |
b |
|
|
The water column on a high pressure steam boiler ____. a. reduces the fluctuation in the water level to prevent carryover b. reduces the turbulence of the water in the gauge glass c. provides a place to install the safety valves d. provides a place to mount the fuel oil pump |
b |
|
|
Safety valves on high pressure boilers can be tested _____. a. only by hand b. only by pessure c. by hand or pressure d. automatically |
c |
|
|
One of the purposes of a bottom blowdown valve is to remove sludge from a boiler. T or F |
T |
|
|
The main function of a steam trap is to remove gases and condensate without the loss of steam. T or F |
T |
|
|
A therm of natural gas has 10,000 Btu. T or F |
F |
|
|
In a natural draft system, the lowest draft reading is obtained at the furnace. T or F |
F |
|
|
Burning fuel produces a chemical reaction that releases heat. T or F |
T |
|
|
The main function of a continuous blowdown system is to reduce the total concentration of solids in the boiler. T or F |
T |
|
|
An evaporation test is a test in which the boiler operator allows the water level in the boiler to drop in order to test the proper operation of the feedwater pump. T or F |
F |
|
|
A throttling calorimeter measures the excess air being used for combustion. T or F |
F |
|
|
When conducting a hydrostatic test, all safety valves are either gagged or blanked, and the water pressure is increased to 1 1/2 times the MAWP. T or F |
T |
|
|
Boiler drum safety valves must open before the superheater safety valve to ensure a backflow. T or F |
F |
|
|
Standard atmospheric pressure will support a column of mercury approximately 30" high. T or F |
T |
|
|
A flow meter totalizes the temperature and pressure of the steam. T or F |
F |
|
|
Purging a furnace before firing can prevent a furnace explosion. T or F |
T |
|
|
Try cocks are most effective at a steam pressure below 250 psi. T or F |
T |
|
|
A pyrometer measures the amount of moisture in the steam leaving a boiler. T or F |
F |
|
|
The forced and induced draft fans on a boiler move the same volume of gas. T or F |
F |
|
|
A high pressure steam boiler has a pressure of more than 15 psi. T or F |
T |
|
|
The size of a boiler tube is determined by the inside diameter of the tube. T or F |
F |
|
|
Superheating steam is possible only at high steam pressures. T or F |
F |
|
|
Preheaters heat air for combustion. T or F |
T |
|
|
An economizer is a heat exchanger that absorbs heat from the gases of combustion leaving a boiler. T or F |
T |
|
|
A desuperheater is only used with saturated steam. T or F |
F |
|
|
Safety valves are located on the uppermost part of the steam space and the outlet of the superheater header. T or F |
T |
|
|
Cavitation occurs when water leaves a steam drum along with the steam. T or F |
F |
|
|
An adequate supply of air is the only thing needed for good combustion. T or F |
F |
|
|
Before laying up a boiler, the boiler operator must ____. a. notify the boiler inspector b. remove the boiler certificate c. thoroughly clean the fire and water sides d. clean only the water side because soot acts as an insulator |
c |
|
|
Neutral on the pH scale is ____. a. 0 b. 4 c. 7 d. 14 |
c |
|
|
_____ is a type of particulate matter (PM) consisting of noncombustible material found in the gases of combustion. a. Combustion air b. Pulverized coal c. Fly ash d. Induced carbon |
c |
|
|
A _____ can be used as part of a draft control system to adjust the speed of a fan. a. damper linkage b. variable-speed drive c. modulating motor starter d. jackshaft |
b |
|
|
According to the ASME Code, the setting or adjusting of a boiler safety valve popping point must be done by a _____. a. boiler inspector b. plant manager c. watch engineer d. qualified repair technician |
d |
|
|
_____ is produced from incomplete combustion due to poor burner design or firing conditions. a. Carbon monoxide b. Nitrogen oxide c. Sulfur d. Mercury |
a |
|
|
A scotch marine boiler is a ____ boiler. a. watertube b. cast iron c. cast iron firetube d. firetube |
d |
|
|
A boiler that has more than ____sq ft of heating surface must have two or more safety valves. a. 100 b. 300 c. 500 d. 1000 |
c |
|
|
A ___ test is used to test the relieving capacity of a safety valve. a. hydrostatic b. accumulation c. Orsat analysis d. opacity |
b |
|
|
An open feedwater heater is located ____. a. above the feedwater pump on the discharge side of the pump b. above the feedwater pump on the suction side of the pump c. below the feedwater pump d. between the feedwater pump and the boiler |
b |
|
|
A draft system regulates the flow of ____ through a boiler. a. air b. steam c. fuel oil d. condensate |
a |
|
|
To start a turbine pump, the discharge valve must be ______. a. closed b. opened c. primed d. hydrostatically closed |
b |
|
|
When performing a hydrostatic test on a boiler, the pressure is ____. a. 75% of the safety valve setting b. 1 1/2 times the safety valve setting c. 2 times the safety valve setting d. operating pressure plus atmospheric pressure |
b |
|
|
The float feedwater regulator element is located ____. a. at the NOWL b. on the right side of the steam drum c. on the left side of the steam drum d. on the feedwater heater |
a |
|
|
At a water temperature of 212F, 1 BHP is equivalent to the evaporation of ____ lb/hr of water. a. 34.5 b. 62.5 c. 180 d. 970.3 |
a |
|
|
The valves located between the boiler and the water column are ____ valves and must be locked and sealed open. a. flow control b. os&y or lever c. stop d. nonreturn |
b |
|
|
To cut a boiler in on a line equipped with hand-operated main steam stop valves, the steam pressure on the boiler coming on-line should be ____. a. slightly lower than line pressure b. slightly higher than line pressure c. equal to line pressure d. no different because the pressure will equalize |
a |
|
|
The suggested range of a boiler steam pressure gauge is ___. a. 1 1/2 to 2 times the safety valve setting b. 2 times the MAWP c. not more than 6% above the MAWP d. gauge pressure plus atmospheric pressure |
a |
|
|
An evaporation test is a test in which the boiler operator allows the water level in a boiler to drop in order to test the proper operation of the _____. a. low-water fuel cutoff b. water column c. main steam stop valve d. safety valve |
a |
|
|
With all of the safety valves popping, the boiler pressure should not go higher than ___. a. 1 1/2 times the MAWP b. 6% above the MAWP c. 8% above the set pressure d. 10% above the set pressure |
b |
|
|
Boiler water containing foreign material can cause an increase in ____. a. foaming b. soot c. flame failure d. safety valve operation |
a |
|
|
A ____ ensures that a burner will not start until all fuel safety equipment is proven. a. furnace purge b. flame scanner c. burner management system d. modulating cam |
c |
|
|
Pressure at the discharge side of a forced draft fan is ____ atmospheric pressure. a. greater than b. less than c. the same as d. balanced at |
a |
|
|
A safe maximum water concentration of dissolved solids is maintained by ____. a. daily blowdowns b. bottom blowdown c. surface blowdowns d. increased makeup water |
c |
|
|
Pyrometers measure ____. a. air duct velocity b. draft c. superheater flow d. temperature |
d |
|
|
A ______ is a rotary mechanical device used to drive rotating equipment, such as a generator, by extracting thermal energy from pressurized steam. a. steam turbine b. gear pump c. cavitation pump d. steam condenser |
a |
|
|
A pressure control maintains the ___ at or near the setpoint. a. pressure b. purge time c. firing rate d. duty cycle |
a |
|
|
An atomizing burner can use ___ to atomize fuel oil. a. water b. gas c. vacuum d. steam |
d |
|
|
____ is the difference in pressure between two points of measurement that causes air or gases of combustion to flow. a. Draft b. Priming c. Flow zone d. Carryover |
a |
|
|
According to the ASME Code, if a boiler has an MAWP that exceeds 100 psi, the boiler must have _____ blowdown valves. a. zero b. one c. two d. three |
c |
|
|
The minimum size pipe connecting a water column to a boiler is ____". a. 1/2 b. 1 c. 1 1/2 d. 2 |
b |
|
|
No. 6 fuel oil has ____ viscosity compared to No. 2 fuel oil. a. no b. a high c. a medium d. a low |
b |
|
|
A ____ steam turbine allows condensate to be reclaimed for reuse. a. atmospheric b. saturated c. condensing d. noncondensing |
c |
|
|
An evaporation test should be performed _____ to check the low-water fuel cutoff control. a. daily b. weekly c. monthly d. annually |
c |
|
|
If a boiler has a heating surface of more than 100 sq. ft, the blowdown lines and fittings must be at least ___" and not more than 2 1/2". a. 1/2 b. 3/4 c. 1 d. 1 1/2 |
c |
|
|
Boilers taken off-line for cleaning and inspection may be dumped (emptied) when the ____. a. boiler pressure is 50 psi or higher b. boiler has cooled c. boiler water temperature is 175F or higher d. automatic nonreturn valve cuts the boiler off-line |
b |
|
|
A lead sulfide cell is sensitive to _____. a. pressure b. temperature c. electricity d. infrared light |
d |
|
|
Anthracite coal has a ____ content. a. high volatile b. low hydrogen c. high fixed carbon d. high ash |
c |
|
|
Bituminous coal has a high ___ content. a. volatile b. hydrogen c. fixed carbon d. ash |
a |
|
|
For the efficient combustion of pulverized coal, it is necessary to maintain _____. a. 50% excess air b. a high furnace temperature c. a low furnace temperature d. positive furnace pressure |
b |
|
|
The surface blowdown line on a steam boiler is located _____. a. at the lowest visible part of the gauge glass b. on the mud drum c. at the highest part of the steam drum d. near the NOWL |
d |
|
|
A dry pipe ____. a. removes moisture from the steam b. connects the dry drum to the steam drum c. increases water circulation d. acts as a receiver |
a |
|
|
The function of the fuel oil burner is to ____. a. preheat the fuel oil b. spray fuel oil into the furnace c. circulate the fuel oil d. pump fuel oil back to the fuel oil tank |
b |
|
|
When performing a hydrostatic test on a boiler, the safety valves must be ___. a. kept free to pop at set pressure b. set at 1 1/2 times the MAWP c. tested at the same time d. gagged or removed, and the openings must be blank-flanged |
d |
|
|
In a three-element feedwater regulating system, ____ are measured. a. steam flow, fuel flow, and feedwater flow b. feedwater flow, water level, and condensate return c. makeup water, condensate return, and water level d. steam flow, feedwater flow, and water level |
d |
|
|
The check valve on the boiler feedwater line ____. a. prevents backflow from the boiler into the feedwater line b. allows the stop valve to be repaired without dumping the boiler c. allows the water level in the boiler to equalize d. prevents the bottom blowdown from backing into the feedwater lines |
a |
|
|
On boilers that have both quick-closing and slow-opening blowdown valves, the quick-closing valve must be located _____. a. after the slow-opening valve b. at the NOWL c. closest to the boiler d. on the bottom blowdown tank |
c |
|
|
An automatic feedwater regulator ____. a. warns of high or low water b. maintains a constant water level c. shuts the burner off in the event of low water d. adds makeup water automatically |
b |
|
|
A common type of steam pressure gauge operates by the movement of a _____. a. safety valve b. Bourdon tube c. os&y valve d. try lever |
b |
|
|
A ____ sensor in a flame scanner senses visible light from the burner. a. lead sulfide b. photocell c. sodium sulfite d. ionic |
b |
|
|
A pH of 11 indicates ____ water. a. alkaline b. neutral c. acidic d. hard |
a |
|
|
The primary function of the ____ is to shut down the burner if the water level in the boiler drops below a safe operating level. a. water flow proving switch b. low-water fuel cutoff c. safety valve d. backflow preventer |
b |
|
|
Foaming may be caused by ______. a. a high water level b. a low water level c. a leaking surface blowdown valve d. impurities on the boiler water surface |
d |
|
|
Fuel, heat, and ____ are required to sustain combustion. a. oxygen b. carbon c. gas d. nitrogen |
a |
|
|
The Bourdon tube in a steam pressure gauge is protected by a _____. a. steam trap b. siphon c. steam strainer d. stopcock |
b |
|
|
A dry pipe on a boiler ____. a. removes moisture from steam b. supplies adequate makeup water c. maintains an NOWL d. is used in the event of a fire |
a |
|
|
A ____ valve is a valve that permits fluid flow in only one direction and closes automatically to prevent backflow. a. globe b. check c. butterfly d. gate |
b |
|
|
____ blowdown is performed to remove sludge and sediment and control high water. a. Continuous b. Surface c. Bottom d. Feedwater |
c |
|
|
Scale deposits on the heating surfaces in a boiler can cause _____. a. a higher rate of heat transfer b. overheating of the boiler metal c. carryover d. purging |
b |
|
|
A deaerating feedwater heater removes dissolved gases such as oxygen and CO2 from the feedwater that can cause ____. a. corrosion b. foaming c. carryover d. pumps to become vaporbound |
a |
|
|
A steam boiler is blown down to _____. a. reduce the amount of dissolved oxygen b. test the safety valve c. remove sludge and sediment d. clean the blowdown lines |
c |
|
|
An air heater employs a counterflow principle in which the gases of combustion ____. a. and air move in opposite directions b. and air move in the same direction c. bypass the flow meter d. and air mix together |
a |
|
|
Boiler operating data and maintenance records are commonly recorded in a ____. a. logbook b. maintenance planner c. combustion control system d. consultant report |
a |
|
|
Mechanical draft is produced by ____. a. the height of the stack b. the diameter of the stack c. power-driven fans d. steam jets |
c |
|
|
A scotch marine boiler has ____. a. an internal furnace b. an external furnace c. a brick setting d. water tubes |
a |
|
|
The tubes in a straight-tube watertube boiler are _____ into drums, headers, or sheets to remain stationary. a. screwed b. rolled and flanged c. expanded and flared d. welded and bolted |
c |
|
|
A compound pressure gauge indicates _____. a. differential pressure b. pressure and vacuum c. absolute pressure d. the sum of the steam pressures on two boilers |
b |
|
|
A ____ valve prevents a boiler from exceeding its MAWP. a. main steam stop b. safety c. os&y d. globe |
b |
|
|
_____ coal has the highest amount of fixed carbon. a. Bituminous b. Anthracite c. Subbituminous d. Semianthracite |
b |
|
|
____ lay-up is used when the boiler is expected to be out of service for an extended period. a. Wet b. Dry c. Bottom d. Surface |
b |
|
|
A ____ test is used to determine if a safety valve and discharge piping are capable of discharging steam. a. try lever b. steam flow c. hydrostatic d. pressure-reducing |
a |
|
|
Soot on the outside of boiler tubes is removed by a ____. a. steam turbine b. water turbine c. soot blower d. wire brush and vacuum cleaner |
c |
|
|
Overheating of tubes on a watertube boiler can be caused by ____. a. excessive soot in the tubes b. the water level being too high c. the water circulation being too rapid d. scale buildup inside the tubes |
d |
|
|
A high pressure boiler has an MAWP of more than ____ psi. a. 1 b. 15 c. 100 d. 212 |
b |
|
|
A ____ boiler comes completely assembled with its own feedwater system, fuel system, combustion control, and draft system. a. package b. electric c. field-erected d. cast iron |
a |
|
|
_____ combustion occurs when all the fuel is burned using the minimum amount of excess air. a. Perfect b. Imperfect c. Incomplete d. Complete |
d |
|
|
The most common type of pump used as a feedwater pump is a ____ pump. a. centrifugal b. steam c. reciprocating d. injector |
a |
|
|
Sludge and sediment from the mud drum of a boiler are discharged into a ____. a. condensate tank b. settling tank c. blowdown tank d. river or pond |
c |
|
|
The atomization of fuel oil in a rotary cup burner is caused by the ____. a. steam atomizer b. rotating cup and primary air c. pressure of the fuel oil d. secondary and primary air |
b |
|
|
A ____ boiler is a boiler in which heat and gases of combustion pass through tubes surrounded by water. a. cast iron b. electric c. watertube d. firetube |
d |
|
|
____ air is used to atomize fuel oil or convey pulverized coal and control the rate of combustion, thus determining the amount of fuel that can be burned. a. Complete b. Incomplete c. Secondary d. Primary |
d |
|
|
Ultimate analysis of coal is used to determine the ____ in the coal. a. amount of volatile matter, fixed carbon, moisture, and ash b. elements present c. heat content d. moisture level |
b |
|
|
In a closed feedwater heater, the _____. a. steam and water come into direct contact b. feedwater pressure is higher than the boiler pressure c. feedwater pressure is lower than the boiler pressure d. noncondensable gases are removed from the top |
b |
|
|
The ____ of a fuel oil indicates how well or poorly the oil will flow during pumping and atomization. a. viscosity b. flash point c. fire point d. specific gravity |
a |
|
|
Economizers are used in large plants so that ______. a. the dew point can be reduced b. impure feedwater can be used c. higher flue gas temperatures can be maintained d. heat from the gases of combustion can be reclaimed |
d |
|
|
A ____ protects against loss of boiler water and potential catastrophic explosion. a. airflow proving switch b. safety valve c. low-water fuel cutoff d. stop valve |
c |
|
|
A pyrometer measures ____. a. temperature b. steam pressure c. draft d. the quality of steam leaving the boiler |
a |
|
|
A steam pressure gauge is typically calibrated in ____. a. cubic feet per minute (cfm) b. pounds per square foot (psf) c. cubic inches per second (cis) d. pounds per square inch (psi) |
d |
|
|
An Orsat analyzer is used to determine the ______ in a boiler. a. required stack gas temperatures b. combustion efficiency c. steam quality d. heating value of the fuel |
b |
|
|
The bottom blowdown valve located farthest from a boiler is always a ____ valve. a. slow-opening b. quick-opening c. stop d. check |
a |
|
|
A _____ automatically removes air and condensate from steam lines. a. steam header b. pressure-relief valve c. gate valve d. steam trap |
d |
|
|
A _____ automatically removes air and condensate from steam lines. a. steam header b. pressure-relief valve c. gate valve d. steam trap |
d |
|
|
When using No. 6 fuel oil, the boiler operator must _____. a. blend it with No. 2 fuel oil b. cool the fuel oil c. heat the fuel oil d. pressurize the fuel oil tank |
c |
|
|
Smoke is the result of ____. a. complete combustion b. incomplete combustion c. too much excess air d. too much primary air |
b |
|
|
In a plant that uses forced draft only, the pressure in the furnace is _____. a. at atmospheric pressure b. greater than atmospheric pressure c. less than atmospheric pressure d. determined by the height of the stack |
b |
|
|
A throttling calorimeter determines ____. a. heat in the condensate b. saturated steam temperature c. superheated steam temperature d. the amount of moisture in steam |
d |
|
|
A throttling calorimeter determines ____. a. heat in the condensate b. saturated steam temperature c. superheated steam temperature d. the amount of moisture in steam |
d |
|
|
The try cocks on a water column are used _____. a. as a secondary means of determining the water level b. to blow down the water column c. as sampling cocks for water testing d. to remove impurities from the surface of the water |
a |
|
|
Boiler water is chemically treated to ____. a. increase oxygen concentration b. prevent scale formation c. increase carbon dioxide concentration d. improve water circulation |
b |
|
|
A _____ system is a boiler system that regulates the flow of air into the burner and the gases of combustion from the burner to the stack. a. gas b. combustion c. oil d. draft |
d |
|
|
____ uses steam pressure as the input signal and outputs a signal to modulating motor that turns a jackshaft to modulate the air and fuel flow. a. Metering control b. ON/OFF control c. Parallel positioning d. Single-point positioning |
d |
|
|
A superheater header safety valve is set to pop at ____ the steam drum safety valves. a. the same pressure as b. the MAWP of c. a lower pressure than d. a higher pressure than |
c |
