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.Management Sciences
Category: Refrigeration and Air Conditioning
One ton refrigeratiqn corresponds to_________________?
A. 50 kcal/min
B. 50 kcal/kr
C. 80 kcal/min
D. 80 kcal/hr
E. 1000 kcal/day
Short horizontal lines on pressure-enthalpy chart show__________________?
A. constant pressure lines
B. constant temperature lines
C. constant total heat lines
D. constant entropy lines
E. constant volume lines
For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?
A. small
B. high
C. euqal
D. anything
E. under some conditions small and under some conditions high
Air refrigeration operates on_____________________?
A. Carnot cycle
B. Reversed Carnot cycle
C. Rankine cycle
D. Erricson cycle
E. Brayton cycle
Highest pressure encountered in a refrigeration system should be________________?
A. critical pressure of refrigerant
B. much below critical pressure
C. much above critical pressure
D. near critical pressure
E. there is no such restriction
Clapeyron equation is a relation between___________________?
A. temperature, pressure and enthalpy
B. specific volume and enthalpy
C. temperature and enthalpy
D. temperature, pressure, and specil volume
E. temperature, pressure, specific volur and’enthalpy
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
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