Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

A vapour absorption refrigerator uses __________ as a refrigerant.
A:
water
B:
ammonia
C:
freon
D:
aqua-ammonia
Answer: D
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For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is __________ that for counter flow.
A:
equal to
B:
less than
C:
greater than
D:
Answer: A
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The freon group of refrigerants are
A:
halo-carbon refrigerants
B:
azeotrope refrigerants
C:
inorganic refrigerants
D:
hydro-carbon refrigerants
Answer: A
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The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
A:
less
B:
more
C:
D:
Answer: B
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A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
A:
lack of cooling water
B:
water temperature being high
C:
dirty condenser surface
D:
all of these
Answer: D
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