Exam Questions Flashcards
Natural gas is:
A) not a fossil fuel
B) not a member of the hydrocarbon family
C) a product of decomposed, prehistoric animal and plant life
D) a product of animal and plant life
C) a product of decomposed, prehistoric, animal and plant life
The ignition temperature of natural gas is:
A) 1100°F
B) 3550°F
C) 1200°F
D) 1000°F
1100°F
The flame temperature for natural gas is:
A) 3550°F
B) 1200°F
C) 1100°F
D) 1000°F
3550°F
True or false, The upper and lower limits of inflammability of natural gas are 5 to 15%
False
True or false, the name of the odorant used to give natural gas to distinct odour is carbon monoxide
False
True or false ,Natural gas is heavier than air per cubic foot
False
Natural gas contains what percentage of methane:
A) 99%
B) 90%
C) 80%
D) 75%
75%
The average house gas line pressure is:
A) 16 O.S.I
B)7” WC
C)28” WC
D)1/2 P.S.I
7” WC
The water filled monometer operates under the principle of:
A) a bourdon tube
B) vacuum
C) pressure, displacing a column of water
D) a mercury barometer
Pressure displacing a column of water
True or false,C.S.A stands for Canadian safety association
False
A factor which affects pressure drop on a gas system is:
A) specific gravity of gas
B) flow rate
C) length of run
D) all of the above
All of the above
True or false the main purpose of a gas pressure regulator is to reduce and maintain the upstream inlet pressure at a desired downstream outlet pressure
True
The three main components of a gas pressure regulator:
A) diaphragm, valve, vent
B) spring, diaphragm, valve
C) spring, diaphragm, vent
D) spring, screw, valve
Spring, diaphragm, valve
The main purpose of a gas metre
A) to measure gas flow
B) to record gas flow
C) to reduce gas pressure
D) both A and b are correct
Both a and B are correct
True or false rotary gas metres are used mainly for domestic applications
False
True or false regulators must be vented
True
The terminating point of the vent piping from a regulator is the:
A) combustion chamber
B) outdoors
C) chimney
D) both a and B are correct
Both a and B are correct
True or false, the two basic types of regulators used in the gas industry are service and appliance
True
Which direction does spring adjusting screw must be tightened to increase the pressure downstream from the regulator:
A) counterclockwise
B) clockwise
C)opposite
D)same
Clockwise
A basic instrument used by the gas industry to measure pressure is:
A) a water filled monometer
B) bourdon tube gauge
C)combustion temp/pressure gauge
D) both a and b
Both a and b
