G2 Test Questions Flashcards
Underground piping or tubing shall be tested in accordance with the:
Requirements of the B149. 1 Code
What is the allowable maximum distance piping supports should be spaced on a 4 inch horizontal gas line?
15 feet
What is the required minimum distance a purge line may terminate from either a building or air intake when purging a piping tubing system to outdoors?
10 feet
Schedule 80 piping is required in a propane system:
For propane vapour over 125 pisg working pressure
What is the minimum time and pressure required to test a new welded 3 inch NPS piping system that is 220 feet long with a supply pressure of 40 psig?
180 minutes at 60 pisg
Above ground piping of which size and larger must be welded, unlesss the authority having jurisdiction allows threaten joints?
2 and 1/2”
What size tubing is required to supply propane to a 225,000 Btuh input appliance when installing 95 feet of copper tubing which will operate at 2 psig with a pressure drop of 1.0 psig?
0.625” (5/8”)
When is it necessary to purge every branch supply line in a piping system?
Always
When sizing a branch line, what is the minimum size of job fabricated welded fitting that can be used on NPS 6” gas supply header?
3/4” NPS
Natural gas piping in industrial building shall be identified:
With yellow paint or yellow bands
When sizing a brand line, what is the maximum size of job fabricated welded fitting that can be used in a 4” NPS gas supply header?
2” NPS
Armoured cable is called”
BX
When a new appliance is to be installed in a building using steel framing and steel studs and the supply wiring to it will be in contact with the studding. Which of the follow types or wire is acceptable, and the most cost effective?
BX
Voltmeters are connected:
In parallel with the device being checked
A panel mounted ground fault circuit interrupting breaker protects all:
Loads in the circuit served by that breaker
A hard, sharp pilot flame indicates:
The orifice is too small
A good pilot generator should produce what voltage?
750 mV
Which of the following statement is correct?
A ground wire shall not be used as a neutral wire
A zero ohmmeter reading tank between the casing of a solenoid and disconnected wire to the solenoid indicates that:
The coil is shorted to the casing of the device
The instrument used to determine potential difference in an electrical circuit is the:
Voltmeter
As the diameter of a wire increases the resistance:
Decreases
In a normal thermocouple application, the expected drop out reading is from:
2-4 millivolts
The resistance of a wire ___________________ as its temperature rises.
Increases
What is the percentage of the appliance-rated gas is applied to a burner using a two stage gas valve when the thermostat calls for the second stage of heat?
100%