• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/140

Click to flip

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;

140 Cards in this Set

  • Front
  • Back

The most efficient operation of a fan demands that the ________ is only sufficient enough to supply the required amount of air.

speed

Balanced draft refers to the combination of _________ and ___________ draft.

forced, induced

A boiler with only an induced draft fan will have a ________ furnace pressure

negative

When the least amount of energy is desired to drive a fan with variable output control, the type of control used would most likely be _________ speed coupling.

variable

A diaphragm draft gauge on a furnace typically indicates the draft in __________ of water column.

millimetres

Which code specifies standards for the air openings required into a boiler room when the boiler is burning oil?

CSA B-139.1

The advantages of a steel stack over a reinforced concrete stack is that a steel stack is a lower ________.

cost

Draft measuring instruments can be used to measure wind box pressure, air heater flue gas pressure and ____________ pressure.

furnace

Natural draft is produced in a boiler furnace when gasses in the stack have _________ mass than an equal column of outside colder air.

less

If a "U" tube is connected to the discharge of a forced draft fan the open end will have a _________ liquid level than the connection to the fan.

higher

When the least amount of energy is desired to drive a fan with variable output control, the type of control used would most likely be a ___________ speed coupling.

variable

In a balanced draft system, the forced draft fan is __________ than the induced draft fan.

smaller

The most efficient operation of a fan demands that the __________ be only sufficient enough to supply the required amount of air.

speed

Proper draft is important to the plant operator because it produces ________ combustion.

efficient

In a balanced draft system the air heater is placed __________ the ID fan and boiler and ___________ the forced draft fan and boiler.

between, between

Variable speed couplings require the ________ amount of energy when the fan is operating at varying speeds.

least

Inlet damper control on a fan requires ______ power to drive the fan at reduced loads.

less

An induced draft fan operates at much __________ temperatures than an FD fan.

higher

With a fan outlet damper control the fan air pressure ____________ with a decrease in air flow.

increases

The inclined "U" tube manometer is __________ accurate than a "U" tube manometer.

more

With axial flow fan the air flow is __________ to the shaft.

parallel

The incomplete combustion of carbon results in the formation of ___________.

CO

The amount of air required to supply just enough oxygen for complete combustion is called ___________ air.

theoretical

The approximate amount of excess air for burning fuel oil is ____%

15%

Carbon monoxide is both explosive and _________.

toxic

A disadvantage of coal compared to oil is that more handling equipment and _________ is required.

labour

When using a mechanical fuel oil atomizer, ________ pump pressure is required.

high

Ethane is a component of natural gas and constitutes a percent volume of ____% - ____%.

10% - 20%

When using a Fyrite Analyzer it is recommended to use _____ bulb strokes to capture a _____ ml sample.

18, 60ml

The main function of a gas burner is to provide _________ of gas with combustion air.

mixing

Boiler stack temperature can rise if the __________ of the boiler becomes fouled.

fireside

Insufficient air for combustion will result in:



_________ in flue gasses


______ oxygen reading in flue gases


______ CO in flue gases

carbon, low, high

A major disadvantage of oil over coal is that oil is more ___________ and less abundant.

expensive

When a gas fired burner is burning fuel properly, it will have a ________ flame with short ________ coloured tips.

blue, yellow

The approximate amount of excess air for fuel oil is ____%

15%

In a steam atomizing oil burner, the _______ travels through the central portion of the burner.

oil

The __________ atomizing burner supplies oil under high pressure.

mechanical

If not enough air is given to an oil fired flame, the flame will be _______ and smokey.

dark

The amount of excess air required for combustion is determined by the composition and ___________ of the fuel.

condition

The three combustible elements of a fuel are:

Hydrogen, Carbon & Sulphur

__________ is added to the coal in a typical FBC unit to ensure that the heated compounds become relatively inert.

limestone

NOx emissions are reduced in a fluidized bed furnace due to the ___________ combustion temperatures.

reduced

In atmospheric fluidized bed combustion units, the fuel content by mass of the turbulent inert material is usually less than _____%

2%

The combustion in a fluidized bed combustion unit can be controlled at a furnace temperature of _______˚C to reduce NOx emissions.

850˚C

Before coal can be burned in a fluidized bed combustion unit, it is necessary to heat the inert bed material to about _________˚C

600˚C

A typical time to heat the bed in a fluidized bed combustion unit to fuel-ignition temperature is ____ hour(s)

1 hour

One major disadvantage of FBC is it will not work with __________ in the coal.

sulphur

A design disadvantage of the application of a PFBC furnace is _________ and/or corrosion/fouling of turbine blades may occur.

erosion

Reducing furnace bed temperatures from 1600˚C to 850˚C reduces as well the production of __________ oxides.

nitrous

What is the ignition temperature of coal?

600˚C

Steam generators of the FBC type can be reduced in size by up to ____%

25%

A gradual loss of the fluidized bed, including fuel (carbon) particles, is due to ____________.

carryover

Fluidized bed combustion is a term describing a _________ of systems of combustion.

range

One major disadvantage of FBC is there is poor combustion _________ at low firing rates.

control

The pressurized combustion chamber allows the use of more efficient _________ cycles.

energy

What is the percentage of SO2 reduction which can be gained by adding an excess amount of limestone to the bed of an AFBC unit? ( ____% - ____%)

80% - 90%

Large "clinkers" are not produced in FBC furnaces because of the __________ furnace temperatures.

lower

For coal containing 5% sulphur, how much limestone might be fed to the furnace of an AFBC unit with each tonne of coal?

1/2 tonne

Two start-up strategies of an FBC unit are:



1. Combustion of auxiliary fuel as a flame ________ the bed fluidized with air.



2. Passing hot gasses through the ______.

above, bed

Operating a PFBC furnace at low temperatures results in the __________ temperature limited over the period of heat supply.

steam

The growth of the bed can be controlled by __________ feed rate and bed _________ rate.

limestone, drain

Because of the one quarter reduction size of FBC plants a significant saving is gained in __________ and construction cost.

material

The ASME code states that if a steam boiler has over _________ m2 of water heating surface, two or more safety valves shall be installed.

47

If a safety valve opens, the boiler pressure will not rise more than ______% above the MAWP

6%

The purpose of the spring in a safety valve is to hold down the ______ on the seat.

disc

Each safety valve on a steam heating boiler is set to discharge at a pressure not exceeding _____ kPa

100 kPa

The safety valves on a boiler meet code requirements and are set to a popping pressure of 1380 kPa. What would be the maximum permissible pressure rise in the boiler, if the boiler was fired at full capacity with the main steam valve closed? (kPa)

82.8 kPa

When performing a safety valve pop test, one of the first things to do is verify the __________ of the applicable steam pressure gauge.

accuracy

If the safety valve of a boiler is set at 200kPa, then the steam gauge dial must be graduated from 0 kPa - ________ kPa.

400kPa

A steam heating boiler safety valve shall be set to discharge at a pressure no greater than ______ kPa.

103

An operator should check that a boiler safety valve will open at its set pressure by ___________ the boiler pressure until the valve opens and noting the pressure on the pressure gauge when the valve opened.

increasing

In order for a person to adjust the opening pressure or popping point of a safety valve, they must be authorized by a boiler _____________.

inspector

The minimum blowdown of an LP safety valve is _____ kPa. (ASME Section IV)

15 kPa

A fitting which is not clearly identified should be ___________.

rejected

Temperature relief devices can open on a rise in temperature by the expansion of a wax-filled rod or by the ________ of the alloy in a fusible plug.

melting

Two safety valves are required on a high pressure steam boiler that has a heating surface larger than _____ m2

47 m2

LP boiler safety valves can be repaired by a qualified boiler operator after permission from the ____________.

inspector

If a safety valve is too small then the boiler pressure will rise more than ____% above the MAWP.

6%

A safety relief valve is like a safety valve except it does not have a ____________ ring or bottom guides

blowdown

A temperature relief valve uses the expansion of a ______ filed rod.

wax

The opening or connection between a heating boiler safety valve and the boiler shall have __________ the same area as the valve inlet.

at least

What does the boiler inspector install to prevent tampering with a safety valve setting?

a seal

If a power boiler has 60 square meters of heating surface, it must have _____________ safety valves.

at least two

When is a stop valve allowed between the safety valve and the boiler drum?

never

The "popping" action of a safety valve is due to the __________-shaped lip on the valve disc.

cone

An LP steam boiler safety valve shall not be smaller than ____mm

13mm

The safety valve test lever must not be used unless pressure is at least ____% of Boiler Operating pressure.

75%

The purpose of the spring in a safety valve is to hold down the ______ on the seat.

disc

If gauge glass breaks, the first action by the operator should be to close the gauge glass _________ valves.

isolation

Tubular gauge glasses should not exceed _____ mm in length.

750 mm

For a horizontal firetube boiler with a diameter greater than 400 mm, ASME code, Section 1, requires the lowest visible level in the gauge glass to be at least ______ mm above the lowest permissible water level as specified by the boiler manufacturer.

75 mm

Round tubular gauge glasses are not recommended for pressures aboue ________ kPa

2800 kPa

According to the codes, each gauge glass shall be fitted with a drain cock or valve having an unrestricted drain opening of not less than ____mm diameter to facilitate cleaning.

6 mm

Quick-closing gauge glass valves require ____ degrees for full travel.

90˚

The bottom of the gauge glass for a heating boiler must be ______ mm above the lowest permissible water level.

25mm

flat gauge glasses are lined with mica to prevent ________ of the glass.

erosion

According to the codes, gauge glasses on power boilers having multiple tubular sections shall have a minimum of _____ mm overlap of the sections in which the water level may be visible.

25 mm

According to the codes, connections from the power boiler to the water column shall be at least ______ mm.

25 mm

Dirp traps are installed on an "Igema" remote water-level indicator to prevent indicating liquid ___________.

contamination

A disadvantage of gauge glass safety-shutoff valve is it requires more __________.

maintenance

If gauge glass breaks, the first action by the operator should be to close the the _______ glass isolating valves.

gauge

When a differential pressure is used to measure water level in a boiler steam drum, the differential pressure is greatest when the drum level is ______.

low

When a fire tube boiler is filled for the first time, it should be confirmed that when the waster first appears in the gauge glass, that there is ______ mm of water over the top of the tubes.

76 mm

The bottom of the gauge glass for a fire tube boiler must be ______ mm above the highest fire tube.

76 mm

For pressure above 2410 kPa, a water column is constructed of __________.

steel

Try cocks are for __________ water level while the gauge glass is out of service.

checking

A great advantage of an Igema level indicator over a Hopkinson unit is there are no _________ parts.

moving

A gauge glass may be surrounded by a number of thin rods, when the boiler is a high pressure unit, the glass is attached to a _________ column.

water

According to the codes, if shut-off valves are installed on a water column, they are to be sealed in the open position and must be ____________ screw and yoke rising spindle gate valves.

outside

According to the codes, connections for gage glasses connected directly to the power boiler or to an intervening water column shall be at least ____ mm.

15mm

According to the codes, a power boiler water column must have a drain connection of at least ______ mm.

20mm

According to the codes connections from the power boiler to the water column shall be at least _______ mm.

25mm

According to the codes, if shutoff valves are provided in the pipe connections between a power boiler and a water column or between a power boiler and the shutoff valves required for the gauge glass what shall the minimum size be? (_____ mm)

25mm

At lower pressures, steam readily rises and _________ from the water.

separates

The intermittent blow-off line (is or is not) a drum internal.

is not

The continuous blowdown valve is usually a __________ valve with an indicator.

regualting

Some smaller boilers have a short pipe which discharges against a baffle in the steam drum. This pipe acts as an internal ___________ pipe.

feed

The chemical injection line is located near the __________ feed pipe.

internal

What purpose does the boiler steam drum serve?



a) provides a place for storage of steam


b) provides a place for the distribution of feedwater


c) provides a place in which equipment can be installed to remove impurities from the steam


d) all of the above

d) all of the above

Relative to steam drum internals, a boiler water test is conducted to adjust or set the ___________ blow down valve (CBD)

contiuous

The steam drum in a modern watertube boiler is a complex piece of equipment with ________ mechanical stages to help separate steam from water.

several

The CBD pipe is controlled by a special __________ or metering valve.

regulating

Impurities must be removed from steam leaving the boiler because ___________ will form on turbine blades.

deposits

A boiler steam drum will allow load __________ to be accomplish more quickly.

increases

The component of a boiler which allows a space for the introduction of chemicals is the _________ drum.

steam

Some smaller boilers have a dry pipe in the steam section of the steam drum that acts as a __________.

separator

The chemical injection line is located near the __________ feed pipe.

internal

The continuous blow down collecting pipe is located a few inches ________ the water level in the steam drum.

below

The boiler continuous blowdown pipe is used to remove the greatest concentration of __________ solids from the drum.

dissolved

Water treatment chemicals are injected using an internal feed pipe near the __________ of the steam drum.

bottom

One of the purposes of combustion control is to:

ensure the proper ratio of air and fuel

If, during a flue gas analysis, the excess air to a boiler furnace is increased:

CO2 with decrease

Low fuel ________ in oil burners produces unsafe conditions of burning.

pressure

Due to various differences in the operation of the FBC plants, the following is required:

A considerably different control system

The efficiency of a combined cycle plant based on PFBC is about _____ higher than a conventional pulverized coal plant.

5%

One method of increasing combustion control at low operating rates in FBC units is to:

Add more expensive control equipment

Operating a PFBC furnace at low temperatures result in:

Steam temperature limited over the period of heat supply

Torsion bar safety valves are deigned for boilers that operate at greater than _______ kPa.

8000 kPa

If the bottom valve of a power boiler gauge glass is more than _____ m above the floor, the operating mechanism must indicate if the valve is open or closed.

2.0 m (2.1m in moodle)

The cyclone separator has ______ removed from the steam by centrifugal force.

moisture