HVAC GAS HEAT CERTIFICATION EXAM
A technician wraps a thermostat wire ten times around his clamp-on ammeter
and measures 5.5 amps between R and W terminals on the thermostat sub-base.
He should set the heat anticipator to - ANSWERS-5.5
A gas valve with 100% shut-off means - ANSWERS-Gas to a pilot and manifold is
shut-off
A gas furnace has an electronic control board. How is the fan cycled during
heating - ANSWERS-Time
A primary cause of burner "flashback" is - ANSWERS-Low manifold pressure
The reason for a crossover on a gas burner is to - ANSWERS-Provide smooth
lighting of all burners
A technician needs to run thermostat wire 75 feet. To avoid a voltage drop, the
technician should use - ANSWERS-#16 AWG
A gas furnace has an induced draft fan. Which switch must operated properly
before ignition sequence starts - ANSWERS-Differential air pressure
, A technician reads 0 Ohms between the common and low speed wires on a 120
VAC furnace motor. From this the technician determines that the winding is -
ANSWERS-Open
On his ohmmeter a technician reads infinity between the high and low speed
wires on a 120 VAC furnace motor. What does this indicate - ANSWERS-Open
The "bonnet capacity" of a furnace is - ANSWERS-Furnace output BTU's
Gas furnace installed at altitudes above _______ feet needs to have adjustments
to operate properly - ANSWERS-2,000
Failure to wire a replacement low voltage transformer in an electronic ignition
furnace, based on its noted polarity, will - ANSWERS-Short the PC board
A spark ignited operates at _____ VAC - ANSWERS-10,000
The pressure inside an induced draft heat exchanger for a mid-efficiency furnace
is approximately - ANSWERS-+2" W.C.
A furnace nameplate specifies a temperature rise of 40 to 70 degrees.
Temperature measurements indicate a rise of 80 degrees. The most appropriate
action is to - ANSWERS-Increase fan speed
A technician wraps a thermostat wire ten times around his clamp-on ammeter
and measures 5.5 amps between R and W terminals on the thermostat sub-base.
He should set the heat anticipator to - ANSWERS-5.5
A gas valve with 100% shut-off means - ANSWERS-Gas to a pilot and manifold is
shut-off
A gas furnace has an electronic control board. How is the fan cycled during
heating - ANSWERS-Time
A primary cause of burner "flashback" is - ANSWERS-Low manifold pressure
The reason for a crossover on a gas burner is to - ANSWERS-Provide smooth
lighting of all burners
A technician needs to run thermostat wire 75 feet. To avoid a voltage drop, the
technician should use - ANSWERS-#16 AWG
A gas furnace has an induced draft fan. Which switch must operated properly
before ignition sequence starts - ANSWERS-Differential air pressure
, A technician reads 0 Ohms between the common and low speed wires on a 120
VAC furnace motor. From this the technician determines that the winding is -
ANSWERS-Open
On his ohmmeter a technician reads infinity between the high and low speed
wires on a 120 VAC furnace motor. What does this indicate - ANSWERS-Open
The "bonnet capacity" of a furnace is - ANSWERS-Furnace output BTU's
Gas furnace installed at altitudes above _______ feet needs to have adjustments
to operate properly - ANSWERS-2,000
Failure to wire a replacement low voltage transformer in an electronic ignition
furnace, based on its noted polarity, will - ANSWERS-Short the PC board
A spark ignited operates at _____ VAC - ANSWERS-10,000
The pressure inside an induced draft heat exchanger for a mid-efficiency furnace
is approximately - ANSWERS-+2" W.C.
A furnace nameplate specifies a temperature rise of 40 to 70 degrees.
Temperature measurements indicate a rise of 80 degrees. The most appropriate
action is to - ANSWERS-Increase fan speed
