NATE ICE EXAM QUESTIONS
CORRECTLY ANSWERED.
After a vacuum pump has been used, a continuous pressure rise in the system most likely indicates -
CORRECT 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 - CORRECT 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 - CORRECT 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? - CORRECT ANSWER non-condensibles in the system
in a compressor, the internal overload senses the winding temperature and - CORRECT ANSWER
amperage in the compressor circuit
the function of an external equalizer line for a thermostatic expansion valve is to - CORRECT 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 - -
CORRECT ANSWER high head and high suction pressures
which one of the following could possibly cause a noisy reciprocating compressor? - CORRECT ANSWER
broken internal springs
two places where superheating occurs in a system are the - CORRECT 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 - - CORRECT ANSWER motor overload
when you are checking for windings of a single-phase compressor with an ohmmeter, the highest ohm
reading would be - - CORRECT 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
- - CORRECT ANSWER internal overload being open
a compressor with tight bearings will cause the amperage to draw to - CORRECT ANSWER rise above
normal
which of the following can be caused by insufficient air flow? - CORRECT ANSWER increased compressor
failure
a correct statement about a hard start kit is that it - CORRECT ANSWER increases starting torque
across an r-22 suction line drier, how much pressure drop indicates changing the drier? - CORRECT
ANSWER 3 psig
which one of the following can be caused by a restricted air filter? - CORRECT ANSWER high superheat
which of the following would most likely occur if a crankcase heater fails? - CORRECT ANSWER the
refrigerant may not be driven out of the oil
a correct statement concerning a relay is that it - CORRECT ANSWER consists of one or more contacts
actuated by a solenoid coil
the control voltage in an air conditioning system comes directly from - - CORRECT ANSWER the
secondary of a step down transformer
CORRECTLY ANSWERED.
After a vacuum pump has been used, a continuous pressure rise in the system most likely indicates -
CORRECT 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 - CORRECT 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 - CORRECT 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? - CORRECT ANSWER non-condensibles in the system
in a compressor, the internal overload senses the winding temperature and - CORRECT ANSWER
amperage in the compressor circuit
the function of an external equalizer line for a thermostatic expansion valve is to - CORRECT 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 - -
CORRECT ANSWER high head and high suction pressures
which one of the following could possibly cause a noisy reciprocating compressor? - CORRECT ANSWER
broken internal springs
two places where superheating occurs in a system are the - CORRECT 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 - - CORRECT ANSWER motor overload
when you are checking for windings of a single-phase compressor with an ohmmeter, the highest ohm
reading would be - - CORRECT 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
- - CORRECT ANSWER internal overload being open
a compressor with tight bearings will cause the amperage to draw to - CORRECT ANSWER rise above
normal
which of the following can be caused by insufficient air flow? - CORRECT ANSWER increased compressor
failure
a correct statement about a hard start kit is that it - CORRECT ANSWER increases starting torque
across an r-22 suction line drier, how much pressure drop indicates changing the drier? - CORRECT
ANSWER 3 psig
which one of the following can be caused by a restricted air filter? - CORRECT ANSWER high superheat
which of the following would most likely occur if a crankcase heater fails? - CORRECT ANSWER the
refrigerant may not be driven out of the oil
a correct statement concerning a relay is that it - CORRECT ANSWER consists of one or more contacts
actuated by a solenoid coil
the control voltage in an air conditioning system comes directly from - - CORRECT ANSWER the
secondary of a step down transformer
