The correct answer is: Existence of a leak.
After a vacuum pump has been used, a
continuous pressure rise in the system most
likely indicates the:
The correct answer is: Presence of moisture.
After a vacuum has been pulled to 500
microns, a pressure rise in a system,
followed by a leveling-off at 1500 microns,
most likely indicates the:
The correct answer is: Insufficient airflow.
On initial start-up of an air-conditioning
system, the temperature drop measured
across the evaporator coil exceeds
manufacture's specifications. This condition
most likely indicates a/an:
The correct answer is: Overcharge of refrigerant.
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 is higher than normal.
• Superheat is 0°F.
• Condenser is clean.
• Outdoor fan operation is normal.
• Sub-cooling is 25°F.
Which of the following is most likely the
problem?
Which one of the following can be caused by The correct answer is: Low superheat.
a restricted air filter?
Which of the following would most likely The correct answer is: Excess refrigerant may migrate to the crankcase.
occur if a crankcase heater fails?
The correct answer is: 3 psig.
Across an R-22 suction line drier, how much
pressure drop indicates changing the drier?
The correct answer is: High head and high suction pressure.
In a fixed orifice air conditioning system, the
presence of non-condensable in the system
will cause:
A compressor with tight bearings will cause The correct answer is: Rise above normal.
the amperage draw to:
Which of the following can be cause by The correct answer is: Increased compressor failure.
insufficient airflow?
The correct answer is: Motor overload.
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 in the:
The correct answer is: Start to run.
When you are checking the windings of a
single-phase compressor with an ohmmeter,
the highest ohm reading would be:
After a vacuum pump has been used, a
continuous pressure rise in the system most
likely indicates the:
The correct answer is: Presence of moisture.
After a vacuum has been pulled to 500
microns, a pressure rise in a system,
followed by a leveling-off at 1500 microns,
most likely indicates the:
The correct answer is: Insufficient airflow.
On initial start-up of an air-conditioning
system, the temperature drop measured
across the evaporator coil exceeds
manufacture's specifications. This condition
most likely indicates a/an:
The correct answer is: Overcharge of refrigerant.
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 is higher than normal.
• Superheat is 0°F.
• Condenser is clean.
• Outdoor fan operation is normal.
• Sub-cooling is 25°F.
Which of the following is most likely the
problem?
Which one of the following can be caused by The correct answer is: Low superheat.
a restricted air filter?
Which of the following would most likely The correct answer is: Excess refrigerant may migrate to the crankcase.
occur if a crankcase heater fails?
The correct answer is: 3 psig.
Across an R-22 suction line drier, how much
pressure drop indicates changing the drier?
The correct answer is: High head and high suction pressure.
In a fixed orifice air conditioning system, the
presence of non-condensable in the system
will cause:
A compressor with tight bearings will cause The correct answer is: Rise above normal.
the amperage draw to:
Which of the following can be cause by The correct answer is: Increased compressor failure.
insufficient airflow?
The correct answer is: Motor overload.
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 in the:
The correct answer is: Start to run.
When you are checking the windings of a
single-phase compressor with an ohmmeter,
the highest ohm reading would be:
