G2 Gas Exam Review UPDATED Exam
Questions and CORRECT Answers
Power supply to a residential building - CORRECT ANSWER- 240/1/60
Gas pipes are bonded to ground? - CORRECT ANSWER- to prevent current from travelling
to ground
As the length of the conductor increases, you should? - CORRECT ANSWER- increases wire
size
a gas filled plug type fuse may be used - CORRECT ANSWER- once
when installing a conductor through steel wall studs, you must use - CORRECT ANSWER-
BX wire
A 240-volt power supply for a residential electrical circuit is taken from the:
A. Line side of one branch circuit breaker and the line side of the second breaker
B. Load side of one main circuit breaker and the load side of the second circuit main breaker
C. Load side of one branch circuit breaker and the load side of the second branch circuit
breaker
D. Line side of one main circuit breaker and the line side of the second main circuit breaker -
CORRECT ANSWER- the line side of both branches (A)
All new residential homes must have what amperage - CORRECT ANSWER- 100 A
Millivolt wiring should be isolated from Line Voltage Wiring because - CORRECT
ANSWER- Line voltage will induce a current in millivolt wiring
is it permissible to use gas piping as a ground? - CORRECT ANSWER- only for a flame
safeguard
,BX is referred to as - CORRECT ANSWER- armored cable
A 120 volt power supply for a furnace is taken from - CORRECT ANSWER- load side of one
branch circuit breaker, and a neutral lug.
What principle does rod and tube control device operate on? - CORRECT ANSWER- All
metal expand at different rates
A Klixon disc responds to changes in? - CORRECT ANSWER- temperature
How is the Heat Anticipator setting determined for a Thermostat with an adjustable
Anticipator? - CORRECT ANSWER- in series
what is the device that allows current flow in only one direction - CORRECT ANSWER-
diode
what device is made of a semi conductive material which reduces resistance when heated -
CORRECT ANSWER- thermistor
an operating control responds to changes in a controlled variable by? - CORRECT
ANSWER- making or breaking a circuit
an operating pressuretrol responds to pressure in? - CORRECT ANSWER- steam pressure
what is the purpose of the anticipator in the thermostat? - CORRECT ANSWER- heat up the
bi-metal coil
the normal setting for a heat anticipator is determined by? - CORRECT ANSWER- the total
current draw of all the components in the circuit
a flow switch that senses the movement of air is? - CORRECT ANSWER- Sail switch
low water cut-off is required on all? - CORRECT ANSWER- Steam boilers
, the infrared sensor uses lead sulphide to transmit a signal. the same principle as a -
CORRECT ANSWER- thermistor
high temperature requires the flame rod to be made of? - CORRECT ANSWER- kanthol
a redundant valve contains - CORRECT ANSWER- 2 shutoff valves
what is not an operating control - CORRECT ANSWER- high limit
what will happen if the heat anticipator is set too low? - CORRECT ANSWER- short cycling
of the main burner
a two speed motor is usually used as - CORRECT ANSWER- a direct drive motor controlled
by single pole double throw relay
when operating gas pressure is higher than _ gas pressure switch is required - CORRECT
ANSWER- 1/2 psig
operating controller is - CORRECT ANSWER- normally closed switch
When infrared waves fall on infrared detector its resistance - CORRECT ANSWER-
decreases
If the number of occupants increase in a tightly constructed building, The? - CORRECT
ANSWER- relative humidity increases
moisture barriers are installed on? - CORRECT ANSWER- the warm side of the insulation
Watt is the unit of measure of: - CORRECT ANSWER- power
a high gas pressure switch will open when pressure is exceeded by? - CORRECT ANSWER-
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Questions and CORRECT Answers
Power supply to a residential building - CORRECT ANSWER- 240/1/60
Gas pipes are bonded to ground? - CORRECT ANSWER- to prevent current from travelling
to ground
As the length of the conductor increases, you should? - CORRECT ANSWER- increases wire
size
a gas filled plug type fuse may be used - CORRECT ANSWER- once
when installing a conductor through steel wall studs, you must use - CORRECT ANSWER-
BX wire
A 240-volt power supply for a residential electrical circuit is taken from the:
A. Line side of one branch circuit breaker and the line side of the second breaker
B. Load side of one main circuit breaker and the load side of the second circuit main breaker
C. Load side of one branch circuit breaker and the load side of the second branch circuit
breaker
D. Line side of one main circuit breaker and the line side of the second main circuit breaker -
CORRECT ANSWER- the line side of both branches (A)
All new residential homes must have what amperage - CORRECT ANSWER- 100 A
Millivolt wiring should be isolated from Line Voltage Wiring because - CORRECT
ANSWER- Line voltage will induce a current in millivolt wiring
is it permissible to use gas piping as a ground? - CORRECT ANSWER- only for a flame
safeguard
,BX is referred to as - CORRECT ANSWER- armored cable
A 120 volt power supply for a furnace is taken from - CORRECT ANSWER- load side of one
branch circuit breaker, and a neutral lug.
What principle does rod and tube control device operate on? - CORRECT ANSWER- All
metal expand at different rates
A Klixon disc responds to changes in? - CORRECT ANSWER- temperature
How is the Heat Anticipator setting determined for a Thermostat with an adjustable
Anticipator? - CORRECT ANSWER- in series
what is the device that allows current flow in only one direction - CORRECT ANSWER-
diode
what device is made of a semi conductive material which reduces resistance when heated -
CORRECT ANSWER- thermistor
an operating control responds to changes in a controlled variable by? - CORRECT
ANSWER- making or breaking a circuit
an operating pressuretrol responds to pressure in? - CORRECT ANSWER- steam pressure
what is the purpose of the anticipator in the thermostat? - CORRECT ANSWER- heat up the
bi-metal coil
the normal setting for a heat anticipator is determined by? - CORRECT ANSWER- the total
current draw of all the components in the circuit
a flow switch that senses the movement of air is? - CORRECT ANSWER- Sail switch
low water cut-off is required on all? - CORRECT ANSWER- Steam boilers
, the infrared sensor uses lead sulphide to transmit a signal. the same principle as a -
CORRECT ANSWER- thermistor
high temperature requires the flame rod to be made of? - CORRECT ANSWER- kanthol
a redundant valve contains - CORRECT ANSWER- 2 shutoff valves
what is not an operating control - CORRECT ANSWER- high limit
what will happen if the heat anticipator is set too low? - CORRECT ANSWER- short cycling
of the main burner
a two speed motor is usually used as - CORRECT ANSWER- a direct drive motor controlled
by single pole double throw relay
when operating gas pressure is higher than _ gas pressure switch is required - CORRECT
ANSWER- 1/2 psig
operating controller is - CORRECT ANSWER- normally closed switch
When infrared waves fall on infrared detector its resistance - CORRECT ANSWER-
decreases
If the number of occupants increase in a tightly constructed building, The? - CORRECT
ANSWER- relative humidity increases
moisture barriers are installed on? - CORRECT ANSWER- the warm side of the insulation
Watt is the unit of measure of: - CORRECT ANSWER- power
a high gas pressure switch will open when pressure is exceeded by? - CORRECT ANSWER-
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