Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

In a vapour compression system, the condition of refrigerant before passing through the condenser is
A:
saturated liquid
B:
wet vapour
C:
dry saturated vapour
D:
superheated vapour
Answer: D
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Prandtl number (PN) is given by PN = μ.cp/k.
A:
Yes
B:
No
C:
D:
Answer: A
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When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmittivity (τ) = 0, then the body is said to be a
A:
black body
B:
grey body
C:
opaque body
D:
white body
Answer: A
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The refrigerant widely used in domestic refrigerators is
A:
ammonia
B:
carbon dioxide
C:
sulphur dioxide
D:
R-12
Answer: D
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The wet bulb depression indicates __________ humidity of the air.
A:
absolute
B:
relative
C:
specific
D:
Answer: B
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