Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

The formation of frost on cooling coils in a refrigerator
A:
increases heat transfer
B:
improves C.O.P. of the system
C:
increases power consumption
D:
reduces power consumption
Answer: C
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The humidity ratio or specific humidity is the mass of water vapour present in
A:
1 m3 of wet air
B:
1 m3 of dry air
C:
1 kg of wet air
D:
1 kg of dry air
Answer: D
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In a refrigerating machine, heat rejected is __________ heat absorbed.
A:
equal to
B:
less than
C:
greater than
D:
Answer: C
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In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
A:
Reynold's number
B:
Grashoff's number
C:
Reynold's number, Grashoff's number
D:
Prandtl number, Grashoff's number
Answer: D
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The C.O.P. of an absorption type refrigerator is given by (where T1 = Temperature at which the working substance receives heat, T2 = Temperature of cooling water, and T3 = Evaporator temperature)
A:
B:
C:
D:
Answer: B
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