NATE ICE EXAM 2025
After 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 1 / 4
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 2 / 4
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 3 / 4
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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