Mechanical Engineering MCQs

Page No. 142

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_________________?


a0.2


b1.2


c5


d6


View Answer 5

Accumulators should have adequate volume to store refrigerant charge at least_________________?


a10%


b25%


c50%


d75%


View Answer 50%

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?


acollect liquid refrigerant and prevent it from going to compressor


bdetect liquid in vapour


csuperheat the vapour


dcollect vapours



In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?


ahigh, of the order of 25°


bas low as possible (3 to 11°C)


czero


dany value



Condensing temperature in a refrigerator is the temperature_________________?


aof cooling medium


bof freezing zone


cof evaporator


dat which refrigerant gas becomes liquid



The value of COP in vapour compression cycle is usually__________________?


aalways less than unity


balways more than unity


cequal to unity


dany one of the above



In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?


aless than 2 kg


bmore than or equal to 3.65 kg


cmore than 10 kg


dthere is no such consideration



Critical pressure of a liquid is the pressure_________________?


aabove which liquid will remain liquid


babove which liquid becomes gas


cabove which liquid becomes vapour


dabove which liquid becomes solid



The vapor pressure of refrigerant should be_________________?


alower than atmospheric pressure


bhigher than atmospheric pressure


cequal to atmospheric pressure


dcould be anything



The higher temperature in vapour compression cycle occurs at____________________?


areceiver


bevaporator


ccondenser discharge


dcompressor discharge


View Answer compressor discharge

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