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Air Conditioning Certification Exam (Exam Code A-02) Questions with 100% correct answers
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Air Conditioning Certification Exam(Exam Code A-02)
✅✅
Heat which causes a change in temperature of a substance is called; -
-sensible heat.
✅✅
Heat which causes a change in state of a material without a change in temperature
is called; - -latent heat.
✅✅
Heat which is added to a vapor after the change of state occurs is called; -
-superheat.
Heat can travel by; -✅✅-conduction, convection, radiation.
The movement of heat by way of fluid (or air) is called; - ✅✅-convection .
The movement of heat by direct contact is called; - ✅✅-conduction .
The standard unit for measuring the quantity of heat in a substance is; - ✅✅-the
British Thermal Unit (Btu).
A refrigerat gives up heat when; - ✅✅-it condenses.
✅✅
It is desirable for refrigerant in the suction line to be slightly superheated in order to; -
-insure liquid refrigerant does not enter the compressor.
The state of refrigerant in the suction line should be; - ✅✅-low pressure/ low
temperature.
The state of the refrigerant entering the condenser is; - ✅✅-high pressure/ highly
superheated liquid.
The evaporator; - ✅✅-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. - -d) Flammability.
✅✅
The sequential order of steps in the vapor - compression process are; -
-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; - -70.2 Psig.
Pressures lower than atmospheric are measured in;
a) inches of mercury
b) microns
✅✅
c) Psig
d) either "A" or "B". - -d) either "A" or "B".
Zero psia (pounds per square inch absolute) is; - ✅✅-a pressure which cannot be
further reduced.
Zero psig (pounds per square inch guage) is; - ✅✅-the same as atmospheric
pressure.
✅✅
The temperature at which moisture will start to condense from the air is called; -
-dew point temperature.
A compound pressure guage measures; - ✅✅-pressure and vacuum.
A mechanical shaft seal is necessary on a; - ✅✅-open drive compressor.
Liquid slugging is; - ✅✅-liquid refrigerant in the compressor clearance space.
The clearance space in a reciprocating compressor; - ✅✅-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. - -d) all of the above
The main function of the condenser is to; - ✅✅-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; - -84.1 psig.
✅✅
There are three basic types of condensers, the air cooled, the water cooled and the
__________cooled. - -evaporative.
10 lbs. of refrigerant pass through a water cooled condenser and gives up 20 Btu's of
heat per lbs. At the same time, 10 lbs. of water passes through with an entering
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