Air Conditioning Certification Exam
(Exam Code A-02)|verified Exam
Question And Correct Answers All
Graded A+|Guaranteed
Success|Latest Update 2024-2025
Heat which causes a change in temperature of a substance is called; - ANSWER-
✔sensible heat.
Heat which causes a change in state of a material without a change in temperature is
called; - ANSWER-✔latent heat.
Heat which is added to a vapor after the change of state occurs is called; - ANSWER-
✔superheat.
Heat can travel by; - ANSWER-✔conduction, convection, radiation.
The movement of heat by way of fluid (or air) is called; - ANSWER-✔convection .
The movement of heat by direct contact is called; - ANSWER-✔conduction .
The standard unit for measuring the quantity of heat in a substance is; - ANSWER-
✔the British Thermal Unit (Btu).
A refrigerat gives up heat when; - ANSWER-✔it condenses.
It is desirable for refrigerant in the suction line to be slightly superheated in order to;
- ANSWER-✔insure liquid refrigerant does not enter the compressor.
The state of refrigerant in the suction line should be; - ANSWER-✔low pressure/
low temperature.
The state of the refrigerant entering the condenser is; - ANSWER-✔high pressure/
highly superheated liquid.
The evaporator; - ANSWER-✔Transfers heat from the refrigerant to the ambient air.
Which of the following is NOT a thermodynamic property of refrigerants?
, a) Critical point.
b) Saturation point.
c) Enthalpy.
d) Flammability. - ANSWER-✔d) Flammability.
The sequential order of steps in the vapor - compression process are; - ANSWER-
✔compression, condensation, expansion, vaporization.
If a 30 pound cylinder of reclaimed R-12 refrigerant has been stored over night at
70°F, the pressure in the cylinder should be approximately; - ANSWER-✔70.2 Psig.
Pressures lower than atmospheric are measured in;
a) inches of mercury
b) microns
c) Psig
d) either "A" or "B". - ANSWER-✔d) either "A" or "B".
Zero psia (pounds per square inch absolute) is; - ANSWER-✔a pressure which
cannot be further reduced.
Zero psig (pounds per square inch guage) is; - ANSWER-✔the same as atmospheric
pressure.
The temperature at which moisture will start to condense from the air is called; -
ANSWER-✔dew point temperature.
A compound pressure guage measures; - ANSWER-✔pressure and vacuum.
A mechanical shaft seal is necessary on a; - ANSWER-✔open drive compressor.
Liquid slugging is; - ANSWER-✔liquid refrigerant in the compressor clearance
space.
The clearance space in a reciprocating compressor; - ANSWER-✔has an effect on
compressor capacity.
Which of the following will cause a change in compressor capacity?
a) suction pressure.
b) discharge pressure.
c) refrigerant vapor density.
d) all of the above. - ANSWER-✔d) all of the above
The main function of the condenser is to; - ANSWER-✔remove heat from the
refrigerant.
Refrigerant R12 vapor enters the condenser at 116.9 psig, 100 F. It leaves the
condenser at 80 F. Its pressure will be approximately; - ANSWER-✔84.1 psig.
There are three basic types of condensers, the air cooled, the water cooled and the
__________cooled. - ANSWER-✔evaporative.
(Exam Code A-02)|verified Exam
Question And Correct Answers All
Graded A+|Guaranteed
Success|Latest Update 2024-2025
Heat which causes a change in temperature of a substance is called; - ANSWER-
✔sensible heat.
Heat which causes a change in state of a material without a change in temperature is
called; - ANSWER-✔latent heat.
Heat which is added to a vapor after the change of state occurs is called; - ANSWER-
✔superheat.
Heat can travel by; - ANSWER-✔conduction, convection, radiation.
The movement of heat by way of fluid (or air) is called; - ANSWER-✔convection .
The movement of heat by direct contact is called; - ANSWER-✔conduction .
The standard unit for measuring the quantity of heat in a substance is; - ANSWER-
✔the British Thermal Unit (Btu).
A refrigerat gives up heat when; - ANSWER-✔it condenses.
It is desirable for refrigerant in the suction line to be slightly superheated in order to;
- ANSWER-✔insure liquid refrigerant does not enter the compressor.
The state of refrigerant in the suction line should be; - ANSWER-✔low pressure/
low temperature.
The state of the refrigerant entering the condenser is; - ANSWER-✔high pressure/
highly superheated liquid.
The evaporator; - ANSWER-✔Transfers heat from the refrigerant to the ambient air.
Which of the following is NOT a thermodynamic property of refrigerants?
, a) Critical point.
b) Saturation point.
c) Enthalpy.
d) Flammability. - ANSWER-✔d) Flammability.
The sequential order of steps in the vapor - compression process are; - ANSWER-
✔compression, condensation, expansion, vaporization.
If a 30 pound cylinder of reclaimed R-12 refrigerant has been stored over night at
70°F, the pressure in the cylinder should be approximately; - ANSWER-✔70.2 Psig.
Pressures lower than atmospheric are measured in;
a) inches of mercury
b) microns
c) Psig
d) either "A" or "B". - ANSWER-✔d) either "A" or "B".
Zero psia (pounds per square inch absolute) is; - ANSWER-✔a pressure which
cannot be further reduced.
Zero psig (pounds per square inch guage) is; - ANSWER-✔the same as atmospheric
pressure.
The temperature at which moisture will start to condense from the air is called; -
ANSWER-✔dew point temperature.
A compound pressure guage measures; - ANSWER-✔pressure and vacuum.
A mechanical shaft seal is necessary on a; - ANSWER-✔open drive compressor.
Liquid slugging is; - ANSWER-✔liquid refrigerant in the compressor clearance
space.
The clearance space in a reciprocating compressor; - ANSWER-✔has an effect on
compressor capacity.
Which of the following will cause a change in compressor capacity?
a) suction pressure.
b) discharge pressure.
c) refrigerant vapor density.
d) all of the above. - ANSWER-✔d) all of the above
The main function of the condenser is to; - ANSWER-✔remove heat from the
refrigerant.
Refrigerant R12 vapor enters the condenser at 116.9 psig, 100 F. It leaves the
condenser at 80 F. Its pressure will be approximately; - ANSWER-✔84.1 psig.
There are three basic types of condensers, the air cooled, the water cooled and the
__________cooled. - ANSWER-✔evaporative.
