Mechanical Engineering MCQs

Page No. 144

The COP of a domestic refrigerator___________________?


ais less than 1


bis more than 1


cis equal to 1


ddepends upon the make


View Answer is more than 1

Critical temperature is’ the temperature above which _____________________?


aa gas will never liquefy


ba gas will immediately liquefy


ca gas will immediately liquefy


dwater will never evaporate



One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice_________________?


ain 1 hour


bin 1 minute


cin 24 hours


din 12 hours


View Answer in 24 hours

In vapour compression cycle the condition of refrigerant is superheated vapour _____________________?


aafter passing through the condenser


bbefore passing through the condenser


cafter passing through the expansion or throttle valve


dbefore [entering the expansion valve



A standard ice point temperature corresponds to the temperature of ___________________?


awater at 0°C


bice at – 4°C


csolid and dry ice


dmixture of ice and water Under equilibrium conditions



One ton refrigeratiqn corresponds to_________________?


a50 kcal/min


b50 kcal/kr


c80 kcal/min


d80 kcal/hr


View Answer 50 kcal/min

Ammonia-absorption refrigeration cycle requires__________________?


avery little work input


bmaximum work input


cmaximum work input


dzero work input



Vapor compression refrigeration is some what like ____________________?


aCarnot cycle


bRankine cycle


creversed Rankine cycle


dnone of the above


View Answer none of the above

An important characteristic of absorption system of refrigeration is__________________?


anoisy operation


bquiet operation


ccooling below 0°C


dvery little power consumption


View Answer quiet operation

In vapour compression cycle, the conditii of refrigerant is saturated liquid________________?


aafter passing through the condenser


bbefore passing through the condensei


cafter passing through the expansion throttle valve


dbefore entering the expansion valve



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