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.Management Sciences
Category: Refrigeration and Air Conditioning
In vapor compression cycle the condition off refrigerant is dry saturated vapor________________?
A. after passing through the condenser
B. before passing through the condenser
C. after passing through the expansion or throttle valve
D. before entering the expansion valve
E. before entering the compressor
Where does the lowest temperature occur in a vapour compression cycle ?
A. condenser
B. evaporator
C. compressor
D. expansion valve
E. receiver
Choose the correct statement?
A. A refrigerant should have low latent heat
B. If operating temperature of system is low, then refrigerant with low boiling point should be used
C. Precooling and subcooling bf refrigerant are same
D. Superheat and sensible heat of a. refrigerant are same
E. Refrigerant is inside the lubes in case of a direct-expansion chiller
The coefficient of performance is the ratio of the refrigerant effect to the_________________?
A. heat of compression
B. work done by compressor
C. enthalpy increase in compressor
D. all of the above
E. none of the above
Critical pressure of a liquid is the pressure_________________?
A. above which liquid will remain liquid
B. above which liquid becomes gas
C. above which liquid becomes vapour
D. above which liquid becomes solid
E. at which all the three phases exist together
In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?
A. condenser and expansion valve
B. compressor and evaporator
C. expansion valve and evaporator
D. compressor and condenser
E. none of the above
The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration__________________?
A. 0.1 to 0.5 h.p. per ton of refrigeration
B. 0.5 to 0.8 h.p. per ton of refrigeration
C. 1 to 2 h.p. per ton of refrigeration
D. 2 to 5 h.p. per ton of refrigeration
E. 5 to 10 h.p. per ton refrigeration
The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?
A. increase
B. decrease
C. remain unaffected
D. may increase or decrease depending on the type of refrigerant used
E. unpredictable
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
The refrigerant for a refrigerator should have ___________________?
A. high sensible heat
B. high total heat
C. high latent heat
D. low latent heat
E. low sensible heat
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