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
Related Mcqs:
- Highest temperature encountered in refrigeration cycle should be________________?
A. near critical temperature of refrigerant
B. above critical temperature
C. at critica. temperature
D. much below critical temperature
E. could be anywhere - One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice_________________?
A. in 1 hour
B. in 1 minute
C. in 24 hours
D. in 12 hours
E. in 10 hours - The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?
A. condensation of the refrigerant vapour
B. evaporation of the refrigerant liquid
C. compression of the refrigerant vapour
D. metering of the refrigerant liquid
E. none of the above - Reducing suction pressure in refrigeration cycle_________________?
A. lowers evaporation temperature
B. increases power required per ton of refrigeration
C. lowers compressor capacity because vapour is lighter
D. reduces weight displaced by piston
E. all of the above - For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?
A. bigger cabinet should be used
B. smaller cabinet should be used
C. perfectly tight vapour seal should be used
D. refrigerant with lower evaporation temperature should be used
E. refrigerant with high boiling point must be used - Vapor compression refrigeration is some what like ____________________?
A. Carnot cycle
B. Rankine cycle
C. reversed Camot cycle
D. reversed Rankine cycle
E. none of the above - Refrigeration in aeroplanes usually employs the following refrigerant___________________?
A. Co2
B. Freon-11
C. Freon-22
D. Air
E. none of the above - A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?
A. 0.2
B. 1.2
C. 5
D. 6
E. 10 - The leaks in a refrigeration system using Freon are detected by____________________?
A. halide torch which on detection produces greenish flame lighting
B. sulphur sticks which on detection gives white smoke
C. using reagents
D. smelling
E. sensing reduction in pressure - The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?
A. same
B. more
C. less
D. more or less depending on ambient conditions
E. unpredictable
