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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