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
Related Mcqs:
- Under-cooling in a refrigeration cycle_________________?
A. increases COP
B. decreases COF
C. COP remains unaltered
D. other factors decide COP
E. unperdictable - A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?
A. Ammonia
B. Carbon dioxide
C. Freon
D. Brine
E. Hydrocarbon refrigerant - 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 vapor compression refrigerator employs the following cycle_________________?
A. Rankine
B. Carnot
C. Reversed Rankine
D. Brayton
E. Reversed Carnot - Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?
A. 1.25
B. 0.8
C. 0.5
D. 0.25
E. none of the above - 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 - 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 - 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 - In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?
A. collect liquid refrigerant and prevent it from going to compressor
B. detect liquid in vapour
C. superheat the vapour
D. collect vapours
E. increase refrigeration effect - The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is_________________?
A. bigger
B. smaller
C. equal
D. smaller/bigger depending on capacity
E. unpredictable
