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.Management Sciences
Category: Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be_______________?
A. high
B. low
C. optimum
D. any value
E. there is no such criterion
Rating of a domestic refrigerator is of the order of__________________?
A. 0.1 ton
B. 5 tons
C. 10 tons
D. 40 tons
E. 100 tons
Which of the following cycles uses air as the refrigerant__________________?
A. Ericsson
B. Stirling
C. Carnot
D. Bell-coleman
E. none of the above
The value of COP in vapour compression cycle is usually__________________?
A. always less than unity
B. always more than unity
C. equal to unity
D. any one of the above
E. none of the above
Under-cooling in a refrigeration cycle_________________?
A. increases COP
B. decreases COF
C. COP remains unaltered
D. other factors decide COP
E. unperdictable
Cooling water is required for following equipment in ammonia absorption plant__________________?
A. condenser
B. evaporator
C. absorber
D. condenser and absorber
E. condenser, absorber and separator (rectifier)
Critical temperature is’ the temperature above which _____________________?
A. a gas will never liquefy
B. a gas will immediately liquefy
C. water will evaporate
D. water will never evaporate
E. none of the above
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process ________________?
A. involves no change in volume
B. takes place at constant temperature
C. takes place at constant entropy
D. takes place at constant enthalpy
E. takes place at constant pressure
Which of the following refrigerants has lowest freezing point_______________?
A. Freon-12
B. NH3
C. C02
D. Freon-22
E. S02
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