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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