NATE ICE Flashcards. Top Exam
Questions & Answers. 100% Accurate.
VERIFIED.
After a vacuum pump has been used, a continuous pressure rise in the system most likely indicates -
✔✔-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 - ✔✔-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 - ✔✔-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? - ✔✔-non-condensibles in the system
in a compressor, the internal overload senses the winding temperature and - ✔✔-amperage in the
compressor circuit
the function of an external equalizer line for a thermostatic expansion valve is to - ✔✔-reference the
pressure at the evaporator outlet
in a fixed orifice air conditioning system, the presence of non-condensables in the system will cause - -
✔✔-high head and high suction pressures
which one of the following could possibly cause a noisy reciprocating compressor? - ✔✔-broken internal
springs
, two places where superheating occurs in a system are the - ✔✔-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 - - ✔✔-motor overload
when you are checking for windings of a single-phase compressor with an ohmmeter, the highest ohm
reading would be - - ✔✔-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
- - ✔✔-internal overload being open
a compressor with tight bearings will cause the amperage to draw to - ✔✔-rise above normal
which of the following can be caused by insufficient air flow? - ✔✔-increased compressor failure
a correct statement about a hard start kit is that it - ✔✔-increases starting torque
across an r-22 suction line drier, how much pressure drop indicates changing the drier? - ✔✔-3 psig
which one of the following can be caused by a restricted air filter? - ✔✔-high superheat
which of the following would most likely occur if a crankcase heater fails? - ✔✔-the refrigerant may not
be driven out of the oil
a correct statement concerning a relay is that it - ✔✔-consists of one or more contacts actuated by a
solenoid coil
Questions & Answers. 100% Accurate.
VERIFIED.
After a vacuum pump has been used, a continuous pressure rise in the system most likely indicates -
✔✔-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 - ✔✔-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 - ✔✔-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? - ✔✔-non-condensibles in the system
in a compressor, the internal overload senses the winding temperature and - ✔✔-amperage in the
compressor circuit
the function of an external equalizer line for a thermostatic expansion valve is to - ✔✔-reference the
pressure at the evaporator outlet
in a fixed orifice air conditioning system, the presence of non-condensables in the system will cause - -
✔✔-high head and high suction pressures
which one of the following could possibly cause a noisy reciprocating compressor? - ✔✔-broken internal
springs
, two places where superheating occurs in a system are the - ✔✔-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 - - ✔✔-motor overload
when you are checking for windings of a single-phase compressor with an ohmmeter, the highest ohm
reading would be - - ✔✔-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
- - ✔✔-internal overload being open
a compressor with tight bearings will cause the amperage to draw to - ✔✔-rise above normal
which of the following can be caused by insufficient air flow? - ✔✔-increased compressor failure
a correct statement about a hard start kit is that it - ✔✔-increases starting torque
across an r-22 suction line drier, how much pressure drop indicates changing the drier? - ✔✔-3 psig
which one of the following can be caused by a restricted air filter? - ✔✔-high superheat
which of the following would most likely occur if a crankcase heater fails? - ✔✔-the refrigerant may not
be driven out of the oil
a correct statement concerning a relay is that it - ✔✔-consists of one or more contacts actuated by a
solenoid coil
