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
Related Mcqs:
- Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?
A. atmospheric pressure
B. slightly above atmospheric pressure
C. 2-4 bars
D. 5-6 bars
E. 7-10 bars - 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 - 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 - In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?
A. less than 2 kg
B. more than or equal to 3.65 kg
C. more than 10 kg
D. there is no such consideration
E. pone of the above - 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 - One of the purposes of sub-cooling the liquid refrigerant is to________________?
A. reduce compressor overheating
B. reduce compressor discharge temperature
C. increase cooling effect
D. ensure that only liquid and not the vapour enters the expansion (throttling) valve
E. none of the above - In vapor compression cycle, the condition of refrigerant is high pressure saturated liquid________________?
A. after passing through the condenser
B. before passing through the condenser
C. after passing through the expansion or thiottle valve
D. before entering the expansion valve
E. before entering the compressor - 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 - 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 - 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
