Mechanical Engineering MCQs

Page No. 140

The COP of a vapor compression plant in comparison to vapor absorption plant is ________________?


amore


bless


csame


dmore/less depending on size of plant


View Answer more

The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?


amore


bless


cequally


dunpredictable


View Answer more

Which of the following refrigerants has lowest freezing point_______________?


aFreon-12


bNH3


cC02


dFreon-22


View Answer Freon-22

The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?


asame


bmore


cless


dmore or less depending on ambient conditions


View Answer less

Reducing suction pressure in refrigeration cycle_________________?


alowers evaporation temperature


bincreases power required per ton of refrigeration


clowers compressor capacity because vapour is lighter


dall of the above


View Answer all of the above

Most of the domestic refrigerators work on the following refrigeration system _________________?


avapour compression


bvapour absorption


ccarnot cycle


delectrolux refrigerator


View Answer vapour compression

The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?


aincrease


bdecrease


cremain unaffected


dunpredictable


View Answer increase

For obtaining high COP, the pressure range of compressor should be_______________?


ahigh


blow


coptimum


dany value


View Answer low

Super heating in a refrigeration cycle __________________?


aincreases COP


bdecreases COP


cCOP remains unaltered


dother factors decide COP


View Answer decreases COP

Moisture in freon refrigeration system causes________________?


aineffective refrigeration


bhigh power consumption


cfreezing automatic regulating valve


dcorrosion of whole system



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