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107 Cards in this Set
- Front
- Back
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What is Purge Gas Systems?
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use nitrogen or other inert gas
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Yellow flame caused by what?
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lack of primary air
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Heat Value:
Natural Gas has __________ BTU's per cubic foot. _____% methane |
1000BTU, 85% methane
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Heat Value:
Propane has _____ BTU's per cubic foot |
2500BTU
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Heat Value:
Butane has _____BTU's per cubic foot |
3500BTU
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What is the ignition temperature of natural gas?
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1200degrees F
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What is the ignition temperature of propane gas?
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920 degrees - 1020degrees F
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What is the maximum temperature of natural gas?
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3500degrees F
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What is the maximum temperature of propane gas?
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3650degrees F
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What are two drafts of an appliance vent?
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natural draft or mechanical draft
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What is a spill switch?
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detects back draft of combustion gases safety device- shuts down gas valve.
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What are the 6 safety devices for water heaters?
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flame roll out protection, T & P valve, Draft diverter, thermocouple or thermo pile, dip tube anti syphon hole, energey cut off switch
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Safety devices for water heaters:
What does the Flame Roll out proctection do? |
prevents fires
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Safety devices for water heaters:
What does the T & P valve do? |
in small heaters. set at 150 PSI 210degrees F rated at BTU's per hour
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Safety devices for water heaters:
What does the Draft Diverter do? |
prevent pilot blow out
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Safety devices for water heaters:
What does the Themocouple or thermo pile do? |
shuts gas when pilot goes out
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Safety devices for water heaters:
What does the Energy cut off switch do? |
Thermal overload control gas valve (fusible link) shuts gas valve (high temps).
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What is improper combustion produce
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It produces carbon monoxide
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What is proper combustion produce?
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produces carbon dioxide
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True or False
Vent appliances using different fuels into a common flue pipe. |
False.
DO NOT vent appliances using different fuels into a common flue pipe. different exhaust gas temps. They must connect independently into the chimney. |
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Water heater installations in bathrooms or bedrooms shall be of the _____ vent type
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direct vent pipe
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____ and ____ are inert gases. used as shielded gas for welding.
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Helium and Argon
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Gas distribution pipe above 4" diam must be ______.
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welded.
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True or False
NYC CODE, UPC, threaded fittings above 4" shall not be used unless acceptable to the authority having jurisdiction. |
True
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True or False
All gas equipment shall have an accessible, approved manual shot-off valve within 8ft of the equipment. UPC |
False
6ft of the equipment |
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What material is not permitted for natural gas inside a building?
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PLASTIC
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Is ether permitted for testing a gas line?
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NO! Ether is a flammable gas. Gas tests meduim shall be air, nitrogen carbon dioxide or an inert gas. Oxygen must NOT be used.
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True or false
Medical Gas: May require certification NITC ISO 9000 |
True
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Medical Gas:
All brazing to be done with nitrogen purge to prevent ____ and keep the tube clean |
oxidation
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Medical Gas:
3 year certification- can be renewed every ___ months, Braze Certificate. |
6 Months
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________ is used once in each room, and every 20 ft and every story height
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pipe labeling
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____ and _______ are positive pressure med gas 10 to 55 PSI.
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Oxygen and nitrous Oxide`
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What are supported gases?
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nitrogen and instrument air
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To ream med gas pipe, use _____ tool only
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deburing
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Med Gas lines:
Minimum size branch is ____" |
1/2"
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Med Gas Lines:
Minimum size vacuum is ____ " |
3/4"
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Med gas lines:
minimum size drop pipes are ___" |
1/2"
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Tubing for Med Gas to be ___________.
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ASTM B-819
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The condition caused by a blockage in a flue is called:
a. signage b. spillage c. sewage d. cavitation |
b spillage
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A "PRV" is used to regulate:
a. pumps b. prawns c. cavitation d. pressure |
d. pressure
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Cavitation refers to the tiny air bubbles that could be produced by a:
a. oirc pump b. bunsen burner c. gas safety valve d. oil well |
A. oirc pump
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Natural gas is approx. what percent methane:
a. 15 b. 50 c. 85 d. 100 |
c. 85
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"B" vent flue pipe is:
a. single wall b. double wall c. outside wall d. no wall |
b. double wall
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The chemical added to the odorless natural gas is called:
a. smelly b. cavitation c. mercurochrome d. mercaptan |
d. mercaptan
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The two types of gas meters are bellows and ___:
a. rotary b. compound c. brass d. gray |
a. rotary
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What is the heating valve of natural gas:
a. 750 BTU b. 1000BTU c. 2500 BTU d. 3600 BTU |
B. 1000 BTU
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A therm is equal to how many BTU's:
a. 1000 b. 10000 c. 100000 d. 1000000 |
c100000
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3" w.c. is equal to what psi?
a. 0.108 b. 1.08 c. .433 d.12 |
a. o.108
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The flame on a Bunsen Burner utilizes what kind of air?
a. fluid b. primary and secondary c. primary d. secondary |
b. primary and secondary
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A bright yellow flame indicates a lack of:
a. air pressure b. primary air c. secondary air d. gas |
b. primary air
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A draft hood is designeed to eliminate :
a. gas b. flue gas c. smells d. draft |
b. flue smells
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The ECO is designed to shut the flow of gas when senses:
a. leak b. high temp c. cold water d. stools |
b. high temp
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A thermocouple produces a :
a. electricity b. magnetism c. cavitations d. thermo children |
a. electricity
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Which gas law is an expansion tank based on:
a. charles b. lussacs c. boyles d. mobiles |
c boyles
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"Bumping" of a circ pump checks its:
a. flow b. leaks c. motivation d. rotation |
d. rotation
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The metric equivalent of a BTU is:
a. cavity b. calorie c. Celsius d. centigrade |
b. calorie
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Which gas is lighter than air?
a. propane b. butane c. map d. methane |
d. methane
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Meter piping should be tested according to whose requirements?
a.utilities b. building code c. NFPA d. NYC |
a. utilities
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Un-insulated return lines in a gravity hot water system will cause circulation to decrease
True or false? |
False
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Circulating pumps use _______ force to raise water.
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centrical
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What kinds of valves should not be used for throttling purposes?
a. globe b. butterfly c. ball d. gate |
??? CHECK
c and d? |
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A hot water circulating pump should be located on what type of pipe?
a. gas b. flue c. supply d. return |
d. return
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A small hole near the top of the dip tube is designed to prevent:
a. corrosion b. siphonage c. contractions d. depression |
b. siphonage
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Convection is caused by a difference in:
a. weather b. pressure c. density d. velocity |
c. density
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A new circulating pump should always be ____ in order to check rotation
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bumped
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a draft hood is connected directly to the:
a. flue connection b. dip tube c. aquastat d. gas burner |
a. flue connection
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Violent flashing and collapsing of vapor bubbles in a pump is called:
a. condensation b. capitulation c. cavitation d. cavities |
c. cavitation
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In a water heater subject to electrochemical corrosion the water is the:
a. anode b. meaningless c. electrolyte d. cathode |
c. electrolyte
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what tool is used to measure pressures less than 1 psi?
a. amp meter b. thermometer c. manometer d. pressure gauge |
c. manometer
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Natural gas has a specific gravity of:
a. .5 b. 1.0 c. 1.5 d. .60 |
d. .60
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Propane has a specific gravity of:
a. .5 b. 1.0 c. 1.5 d. .60 |
c. 1.5
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Air has a specific gravity of:
a. .5 b. 1.0 c. 1.5 d. .60 |
1.0
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Boyles law states that with temperature constant, the volume of a gas is inversely proportional to the ____ exerted on it.
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pressure
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Lussac's law states that with pressure constant, volume is directly proportional to _____.
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temperature
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Charles's law states that with volume constant, temperature will be directly proportional to ____
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pressure
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Density is expressed as:
a. psi b. lbs/cu c. gpm d. fps |
b. Lbs/cu
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What is the smallest part of a molecule?
a. compound b. element c. atom d. alloy |
c. atom
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Which of these will cause a change of state?
a. heat b. compression c. movement d. chanting |
a. heat
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What causes water at 212degrees F to change to steam at 212degreesF?
a. heat b. hidden heat c. chanting d. latent heat |
d. latent heat
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A molecule is the smallest part of a/an?
a. element b. atom c. mole d. mixture |
a. element
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The boiling point of water is affected by:
a. volume b. heat source c. color d. pressure |
d. pressure
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Water is most dense at:
a. 32 degrees F b. 0 degrees F c. 37 degrees F d. 39 degrees F |
39 degrees F
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What is required to change the temperature of 1 pound of water, 1degree F?
a. 1 calorie b. 1 btv c. 1btu d. 1 bth |
d. 1bt
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When a change of temperature is measured in a substance, you can conclude that ___ heat has been measured.
a. sensitive b. sensible c. some d. latent |
b. sensible
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The process by which vapor changes to a liquid, is called?
a. compensation b. consumption c. conduction d. condensation |
d. condensation
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Water that comes in contact with calcium, magnesium, or other minerals could be described as:
a. soft b. hard c. bad d. tepid |
b. hard
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An atom with an unbalanced electrial charge is called a:
a.Ioff b. eon c. ion d. neutral |
??????
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Neutral on the PH scale is:
a. 1 b. 6 c. 7 d. 14 |
c. 7
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___ is the study of liquids in motion
a. fluids b. pneumatics c. hydrodynamics d. hydraulics |
d. hydrualics
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___ is the study of the mechanical properties of air.
a. fluids b. pneumatics c. hydonamics d. hydraulics |
b. pneumatics
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What is the name of the gauge most commonly used?
a. Bourdon b. bourbon c. liquid fill d. air filled |
a. Bourdon
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In an enclosed space, pressure is distributed ___ in all directions:
a.sometimes b. never c. partially d. equally |
d. equally
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Force and pressure are equal.
True or false |
false
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A pressure less than atmospheric id described as:
a. low b. high c. viscous d. vacuum |
d. vacuum
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An expansion tank works on the principle of __ law.
a. Lussacs b. Charles c. Boyles d. PAscals |
C. Boyles
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The vessel in a Pressure Assist water closet is described as ___ tank.
a. hydraulic b. thermal expansion c. pneumatic d. hydro-pneumatic |
d. hydro-pneumatic
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Most water closets rely on ___ action to operate
a. any b. electric c. centrifugal d. siphonic |
d. siphonic
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An upward force applied against an object submerged in a liquid is called:
a. gravity b. hydraulics c. buoyancy d. displacement |
c. buoyancy
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Archimedes principle states that a body submerged in a fluid loses as much ___ as the fluid it displaces
a. weight b. volume c. area d. pressure |
a. weight
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___ flow in a pipe will cause a minimal amount of friction.
a. turbulent b. fast c. laminar d. turdulent |
c. laminar
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Discharge from a small nozzel at a very high velocity will cause the pressure at the nozzle to be very low, even below atmospheric pressures at times. This effect is called a:
a. Bernoulli b. laminar c. siphon d.venturi |
d. venturi
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In a gas appliance if the flames are jumping off the burner it is an indication of:
a. high gas pressure b. low gas pressure c. too much primary air d. too little primary air |
d. too little primary air
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The ratio of the force that performs hte work to the force which is applied to a machine is called:
a. work b. force c. friction d. mechanical advantage |
d. mechanical advantage
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Levers, pulleys, wheels, inclined planes, wedges, and the screw are one of the six simple:
a. tools b. methods c. machines d. implements |
c. machines
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How many classifications of levers are there?
a. 1 b. 2 c. 3 d. 4 |
c. 3
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A fixed point about which the resistance arm and the effort arm rotate is called the ____.
a. pivot b. focus c. axis d. fulcrum |
d. fulcrum
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An ____ is the combination of two or more metals or a metal and another substance:
a. aluminium b. mixture c. compound d. alloy |
d. alloy
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