MCC HVAC MIDTERM EXAM Questions and Correct Answers the Latest Update and Recommended Version
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Course
MCC HVAC
Institution
MCC HVAC
List at least five factors that must be controlled if a comfortable indoor environment is to be
maintained.
The factors that must be controlled include temperature, humidity, air motion, dust,
bacteria, odors, toxic gases, and ionization.
((Ref: 1/1))
Describe in simple terms the basic p...
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MCC HVAC MIDTERM EXAM Questions
and Correct Answers the Latest Update
and Recommended Version
List at least five factors that must be controlled if a comfortable indoor environment is to be
maintained.
✓ The factors that must be controlled include temperature, humidity, air motion, dust,
bacteria, odors, toxic gases, and ionization.
✓
✓ ((Ref: 1/1))
Describe in simple terms the basic process by which a refrigerant transfers heat energy.
✓ A refrigerant is used to transfer heat when it changes states. When liquid refrigerant
evaporates into a vapor, heat is absorbed by the vapor. When refrigerant vapor is
condensed into a liquid, heat is rejected from the refrigerant.
✓
✓ ((Ref: 2/3))
In your own words, state the first law of thermodynamics.
✓ Energy can neither be created nor destroyed, but can be changed from one form into
another.
✓
✓ ((Ref: 3/2))
Define work.
✓ A force moving an object in the direction of the force.
✓
✓ ((Ref: 3/3))
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✓ Latent heat causes a change in the state of a substance without a change in its
temperature. Sensible heat causes a change in the temperature of substance without a
change in its state.
✓
✓ ((Ref: 6/1))
The latent heat of _____ causes a change in phase from vapor to liquid. The latent heat of
_____ causes a change in phase from liquid to vapor.
✓ Condensation, vaporization.
✓
✓ ((Ref: 6/1))
What is specific heat?
✓ Specific heat is the energy required to raise the temperature of 1 lb of a substance by 1
degree F.
✓
✓ ((Ref: 6/3))
What is superheat?
✓ Superheat is energy that raises the temperature of a vapor above its saturation
temperature.
✓
✓ ((Ref: 6/4))
Convert 68 degrees F to an equivalent Celsius temperature.
✓ 68 degrees minus 32, divided by 1.8 = 20 degrees Celsius
✓
✓ ((Ref: 7/2))
Convert 25 degrees Celsius to an equivalent Fahrenheit temperature.
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