During an annual service check up, it is discovered that there is a moderate amount of resistance on a "bellyband" crankcase heater. What does this condition indicate?
A. the crankcase heater will operate
B. the crankcase heater will not operate
C. the crankcase heater is open
D. the crankcas...
NATE AC Practice 3 Questions &
Answers(RATED A+)
During an annual service check up, it is discovered that there is a moderate amount of resistance on
a "bellyband" crankcase heater. What does this condition indicate?
A. the crankcase heater will operate
B. the crankcase heater will not operate
C. the crankcase heater is open
D. the crankcase heater voltage must be increased for proper operation - ANSWERA. the crankcase
heater will operate
High superheat is a symptom of:
A. a system overcharge
B. a clogged air filter
C. a blower fan operating on a speed that is too low
D. an extremely high indoor temperature - ANSWERD. An extremely high indoor temperature
Electronic type leak detectors typically have a push-button or knob for setting a reference refrigerant
level. This feature is useful for:
A. adjusting the detector after installing a new battery
B. checking the factory calibration of the instrument
C. setting the detector for use in environments with ambient refrigerant vapor
D. adjusting the detector for the type of refrigerant to be checked - ANSWERC. Setting the detector
for use in environments with ambient refrigerant vapor
The continuity of a fuse should be tested by:
A. checking resistance with power off
B. checking resistance with power on
,C. checking resistance from the load side of the fuse to ground
D. checking resistance from the supply side of the fuse to ground - ANSWERA. Checking resistance
with power off
When performing a preventive maintenance on an outdoor unit, check the wiring to be certain:
A. no wires have broken or loosened
B. all wires are connected to their proper terminal
C. all wire sizes are correct
D. the correct wire type has been used - ANSWERA. No wires have broken or loosened
What is the effect of 170 volts supplied to a 208/230 volt compressor?
A. no effect; the motor will continue to run
B. current decreases and the motor runs cooler
C. current increases and the motor may trip on overload
D. current increases and the motor runs cooler - ANSWERC. Current increases and the motor may
trip on overload
To properly set the heat anticipator it is necessary to check the:
A. voltage rating of the heat relay
B. heating control circuit amperage draw
C. BTU output of the furnace
D. VA rating of the transformer - ANSWERB. Heating control circuit amperage draw
What could cause a customer to complain that their home feels damp or "sticky"?
A. high head pressure
B. returns may be pulling in attic air due to duct damage
C. the thermostat setting is too low
, D. the heat sequencers may be off - ANSWERB. Returns may be pulling in attic air due to duct
damage
In a simple refrigeration system, the refrigerant boils in the:
A. metering device
B. compressor
C. evaporator
D. condenser - ANSWERC. Evaporator
Refer to the diagram above and answer the question: When troubleshooting an energized electrical
circuit on an electric heat section, 244 volts is measured across the elements at points A and B and
no amperage is measured. what is the problem with this system?
A. the element has a short in it
B. the element is shorted to ground
C. a fuse link is open
D. the electric element is open - ANSWERD. The electric element is open
A bright red or orange glow from the resistance elements in a duct heater indicates that the:
A. duct heaters are operating properly
B. flow of air is insufficient
C. line voltage is insufficient
D. supply wires are oversized - ANSWERB. Flow of air is insufficient
When under a deep vacuum, a hermetic refrigeration compressor's:
A. oil must be kept warm to avoid its breakdown
B. motor insulation improves its dielectric strength
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