Exam (elaborations)
NATE Heat Pump Exam 2024/2025
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NATE Heat Pump Exam 2024/2025 NATE Heat Pump Exam 2024/2025
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NATE ICE EXAM 2025After a vacuum pump has been used, a continuous pressure rise in the system
most likely indicates - ANSWER existence of a leak
after a vacuum has been pulled to 500 microns, a pressure rise in the system,
followed by a leveling-off at 1500 microns, most likely indicates the - ANSWER
presence of a moisture
on initial start up of an air conditioning system, the temperature drop measured
across the evaporator coil exceeds manufacturer's specifications. this condition
most likely indicates - ANSWER lack of refrigerant
charge
,the technician is on a spring maintenance check of an air conditioning system.
they find the following - head pressure is higher than normal, suction pressure
higher than normal, superheat 0 degrees, condenser is clean, outdoor fan
operation is normal, subcooling is 25 degrees. which of the following is most likely
the problem? - ANSWER non-condensibles in the
system
in a compressor, the internal overload senses the winding temperature and -
ANSWER amperage in the compressor circuit
the function of an external equalizer line for a thermostatic expansion valve is to -
ANSWER reference the pressure at the evaporator outlet
in a fixed orifice air conditioning system, the presence of non-condensables in the
system will cause - - ANSWER high head and high
suction pressures
,which one of the following could possibly cause a noisy reciprocating compressor?
- ANSWER broken internal springs
two places where superheating occurs in a system are the - ANSWER
evaporating coil and the compressor
if the fan switch on a thermostat sub-base is set to ON and the blower motor is
cycling on and off, the most probable cause is - - ANSWER
motor overload
when you are checking for windings of a single-phase compressor with an
ohmmeter, the highest ohm reading would be - - ANSWER
start to run
, a compressor does not run, although the condenser fan is operating. reading the
compressor windings, the measured resistance between r to a is 5 ohms, r to c is
open and s to c is open. the problem is due to - - ANSWER
internal overload being open
a compressor with tight bearings will cause the amperage to draw to -
ANSWER rise above normal
which of the following can be caused by insufficient air flow? - ANSWER
increased compressor failure
a correct statement about a hard start kit is that it - ANSWER
increases starting torque
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