Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

In case ofsensible cooling of air, the coil efficiency is given by
A:
B.P.F. - 1
B:
1 - B.P.F.
C:
D:
1 + B.P.F.
Answer: B
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For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is
A:
zero
B:
20
C:
50
D:
100
Answer: D
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The evaporator changes the low pressure liquid refrigerant from the expansion valve into
A:
high pressure liquid refrigerant
B:
low pressure liquid and vapour refrigerant
C:
low pressure vapour refrigerant
D:
none of these
Answer: C
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The critical temperature is the temperature
A:
below which a gas does not obey gas laws
B:
above which a gas may explode
C:
below which a gas is always liquified
D:
above which a gas will never liquified
Answer: D
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A composite slab has two layers of different materials with thermal conductivities k1 and k2. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be
A:
k1 k2
B:
k1 + k2
C:
D:
Answer: D
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