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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