HVAC AC Excellence Exam
(100 questions) with verified
solutions
Heat which causes a change in temperature of a substance is called -
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correct answer ✔Sensible Heat
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Heat added to a substance without a rise in temperature: (example) liquid
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refrigerant to gas) this process is called - correct answer ✔Latent Heat of
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Vaporization
Heat added to a refrigerant in a vapor state after the evaporation process
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is called? - correct answer ✔Superheat
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A scroll compressor mover refrigerant means of? - correct answer
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✔Involutes spiral |||
The movement of heat by way of fluid (or air) is called? - correct answer
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✔Convection
The movement of heat by through a solid object is callled? - correct
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answer ✔Conduction |||
, The standard unit for measuring the quantity of heat in a substance is? -
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correct answer ✔BTU British Thermal Unit
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A refrigerant gives heat when - correct answer ✔It Condenses
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Why must refrigerant in the suction line be slightly warmer than the
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saturation temperature? - correct answer ✔Prevent Liquid Slugging of the
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Compressor
The state of the refrigerant in the suction line should be - correct answer
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✔Low Pressure/ Low Temperature Vapor
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The state of refrigerant entering the condenser is - correct answer ✔Low
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Pressure/ Low Temperature Vapor ||| ||| |||
The Evaporator - correct answer ✔Transfers heat from the refrigerated
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space to the refrigerant
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Which of the following is not a thermodynamic property of refrigerant? -
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correct answer ✔Flammability
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The sequential order of steps in the evaporator -compressor are? - correct
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answer ✔Compression, Condensation, Expansion, Vaporization
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If a 30 pound cylinder of reclaim R-410a refrigerant has been stored over
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night at 70F, the pressure in the cylinder should be approximately? -
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correct answer ✔201 psig ||| ||| |||
(100 questions) with verified
solutions
Heat which causes a change in temperature of a substance is called -
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
correct answer ✔Sensible Heat
||| ||| |||
Heat added to a substance without a rise in temperature: (example) liquid
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
refrigerant to gas) this process is called - correct answer ✔Latent Heat of
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
Vaporization
Heat added to a refrigerant in a vapor state after the evaporation process
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
is called? - correct answer ✔Superheat
||| ||| ||| ||| |||
A scroll compressor mover refrigerant means of? - correct answer
||| ||| ||| ||| ||| ||| ||| ||| ||| |||
✔Involutes spiral |||
The movement of heat by way of fluid (or air) is called? - correct answer
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
✔Convection
The movement of heat by through a solid object is callled? - correct
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
answer ✔Conduction |||
, The standard unit for measuring the quantity of heat in a substance is? -
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
correct answer ✔BTU British Thermal Unit
||| ||| ||| ||| |||
A refrigerant gives heat when - correct answer ✔It Condenses
||| ||| ||| ||| ||| ||| ||| ||| |||
Why must refrigerant in the suction line be slightly warmer than the
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
saturation temperature? - correct answer ✔Prevent Liquid Slugging of the
||| ||| ||| ||| ||| ||| ||| ||| ||| |||
Compressor
The state of the refrigerant in the suction line should be - correct answer
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
✔Low Pressure/ Low Temperature Vapor
||| ||| ||| |||
The state of refrigerant entering the condenser is - correct answer ✔Low
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
Pressure/ Low Temperature Vapor ||| ||| |||
The Evaporator - correct answer ✔Transfers heat from the refrigerated
||| ||| ||| ||| ||| ||| ||| ||| ||| |||
space to the refrigerant
||| ||| |||
Which of the following is not a thermodynamic property of refrigerant? -
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
correct answer ✔Flammability
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The sequential order of steps in the evaporator -compressor are? - correct
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
answer ✔Compression, Condensation, Expansion, Vaporization
||| ||| ||| |||
If a 30 pound cylinder of reclaim R-410a refrigerant has been stored over
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
night at 70F, the pressure in the cylinder should be approximately? -
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
correct answer ✔201 psig ||| ||| |||
