GAS CFESA REVIEW STUDY QUESTIONS WITH
100% VERIFIED ANSWERS ALREADY GRADED
A+ | GUARANTEE PASS
1. Where does natural gas come from? - ANSWER Found in wells drilled
deep in the ground
2. Where does lp gas come from? - ANSWER It is a byproduct of natural gas
3. What are three gases often termed LP? - ANSWER Propane, butane, ethane
4. Are LP tanks filled with gas or liquid? - ANSWER Liquid
5. What happens in a LP tank as gas is drawn off? - ANSWER Pressure in the
tank begins to fall and so does the boiling point.
6. To solve unusual venting problems like negative pressure, high winds, long
vents, the installe
should use_____?
A) A larger size vent pipe
B) Vent outlets
C) Vent top turbines
D) A draft hood - ANSWER D
7. What is a bypass flame?
A) The smallest flame that will keep the burners lit after the gas
thermostat has reached the
,temperature set point
B) A flame that is 3/8" tall after the thermostat shuts off
C) A flame left on the burner to keep the pilot form going out
D) A flame to a special part of the burner after the main burner goes off -
ANSWER A
8. The primary purpose of a vent on a regulator is to:
A) Vent leaking gas
B) Allow diaphragm movement
C) Allow high pressure
D) Monitor flow - ANSWER B
9. A properly burning infrared ceramic burner will look______?
A) Blue
B) Bright reddish orange
C) Dull red
D) Blue with a tint of orange - ANSWER B
10.Vent lines are required on regulators above 1" and must be vented:
A) A pilot flame
B) An open flame within 2 feet
C) A working flue or exhaust system
D) The outside atmosphere, above the snow line - ANSWER D
11.What is the proper flame current for an ignition module?
A) Always 3 or more microamps
B) Always ¼ or more microamps
C) It depends on the module manufacturer
D) Always 2 or more microamps - ANSWER C
12.Does natural gas have an odor? - ANSWER No
,13.What is specific gravity of a gas? - ANSWER The weight of the gas
compared to the weight of air, specific gravity of air is 1. Anything lower
than one will float.
14.Is natural gas heavier or lighter than air? - ANSWER Lighter
15.Is LP gas heavier or lighter than air - ANSWER Heavier
16.Why is LP more dangerous to work with than natural gas? - ANSWER It is
heavier than air and will fall and not dissapate
17.What is the hearing value of a cubic foot of natural gas? - ANSWER
950btus to 1150btus
18.What is the heating value of LP gas? - ANSWER 2500btus
19.How should you check for leaks? - ANSWER Soapy bubbles or
combustible leak detectors
20.Which gas is more volatile, NG OR LP? - ANSWER LP
21.The purpose of a draft hood/draft diverter is_______?
A) To prevent drafts from entering the burner compartment that comes
from the power cent
hoods.
B) To prevent the combustion chamber from overheating, and allowing air to
come down the
, vent pipe into the room.
C) To allow the flue to control the amount of secondary air drawn in instead of
the vent pipe,
and to prevent air from coming back down the vent into the combustion
chamber
D) To allow the vent pipe to control the amount of secondary air drawn into the
combustion
chamber as designed by its height above the hood. - ANSWER C
22.The two primary functions of the flue are____?
A) The remove combustion byproducts and heat from the equipment
B) To create a draft to pull in secondary air and remove the byproducts
form the combustion
chamber
C) To create a draft to keep the burners cool and remove byproducts from
the cooking area
D) To remove the excessive heat to keep the burners, and cooking surface
from overheating - ANSWER B
23.Primary air is the air______?
A) That surrounds the burner
B) That enters the burner though the venture
C) Is the air that is vented through the exhaust system
D) That must always have a pressure greater than the incoming gas
pressure - ANSWER B
Every time a gas fired convection oven shuts off the gas flow to the burners there
is a loud pop.
The oven is rated for and using LP gas. The noise is called_____, and can be
reduced by____ the
100% VERIFIED ANSWERS ALREADY GRADED
A+ | GUARANTEE PASS
1. Where does natural gas come from? - ANSWER Found in wells drilled
deep in the ground
2. Where does lp gas come from? - ANSWER It is a byproduct of natural gas
3. What are three gases often termed LP? - ANSWER Propane, butane, ethane
4. Are LP tanks filled with gas or liquid? - ANSWER Liquid
5. What happens in a LP tank as gas is drawn off? - ANSWER Pressure in the
tank begins to fall and so does the boiling point.
6. To solve unusual venting problems like negative pressure, high winds, long
vents, the installe
should use_____?
A) A larger size vent pipe
B) Vent outlets
C) Vent top turbines
D) A draft hood - ANSWER D
7. What is a bypass flame?
A) The smallest flame that will keep the burners lit after the gas
thermostat has reached the
,temperature set point
B) A flame that is 3/8" tall after the thermostat shuts off
C) A flame left on the burner to keep the pilot form going out
D) A flame to a special part of the burner after the main burner goes off -
ANSWER A
8. The primary purpose of a vent on a regulator is to:
A) Vent leaking gas
B) Allow diaphragm movement
C) Allow high pressure
D) Monitor flow - ANSWER B
9. A properly burning infrared ceramic burner will look______?
A) Blue
B) Bright reddish orange
C) Dull red
D) Blue with a tint of orange - ANSWER B
10.Vent lines are required on regulators above 1" and must be vented:
A) A pilot flame
B) An open flame within 2 feet
C) A working flue or exhaust system
D) The outside atmosphere, above the snow line - ANSWER D
11.What is the proper flame current for an ignition module?
A) Always 3 or more microamps
B) Always ¼ or more microamps
C) It depends on the module manufacturer
D) Always 2 or more microamps - ANSWER C
12.Does natural gas have an odor? - ANSWER No
,13.What is specific gravity of a gas? - ANSWER The weight of the gas
compared to the weight of air, specific gravity of air is 1. Anything lower
than one will float.
14.Is natural gas heavier or lighter than air? - ANSWER Lighter
15.Is LP gas heavier or lighter than air - ANSWER Heavier
16.Why is LP more dangerous to work with than natural gas? - ANSWER It is
heavier than air and will fall and not dissapate
17.What is the hearing value of a cubic foot of natural gas? - ANSWER
950btus to 1150btus
18.What is the heating value of LP gas? - ANSWER 2500btus
19.How should you check for leaks? - ANSWER Soapy bubbles or
combustible leak detectors
20.Which gas is more volatile, NG OR LP? - ANSWER LP
21.The purpose of a draft hood/draft diverter is_______?
A) To prevent drafts from entering the burner compartment that comes
from the power cent
hoods.
B) To prevent the combustion chamber from overheating, and allowing air to
come down the
, vent pipe into the room.
C) To allow the flue to control the amount of secondary air drawn in instead of
the vent pipe,
and to prevent air from coming back down the vent into the combustion
chamber
D) To allow the vent pipe to control the amount of secondary air drawn into the
combustion
chamber as designed by its height above the hood. - ANSWER C
22.The two primary functions of the flue are____?
A) The remove combustion byproducts and heat from the equipment
B) To create a draft to pull in secondary air and remove the byproducts
form the combustion
chamber
C) To create a draft to keep the burners cool and remove byproducts from
the cooking area
D) To remove the excessive heat to keep the burners, and cooking surface
from overheating - ANSWER B
23.Primary air is the air______?
A) That surrounds the burner
B) That enters the burner though the venture
C) Is the air that is vented through the exhaust system
D) That must always have a pressure greater than the incoming gas
pressure - ANSWER B
Every time a gas fired convection oven shuts off the gas flow to the burners there
is a loud pop.
The oven is rated for and using LP gas. The noise is called_____, and can be
reduced by____ the
