Mechanical Engineering MCQs

Page No. 145

In vapor compression cycle the condition off refrigerant is dry saturated vapor________________?


aafter passing through the condenser


bbefore passing through the condenser


cbefore passing through the condenser


dbefore entering the compressor



The moisture in a refrigerant is removed by___________________?


aevaporator


bsafety relief valve


cdehumidifier


ddriers


View Answer driers

The vapor compression refrigerator employs the following cycle_________________?


aRankine


bCarnot


cReversed Rankine


dReversed Carnot


View Answer Reversed Carnot

The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?


awill be higher


bwill be lower


cwill remain unaffected


dmay be higher or lower depending upon the nature of non-condensable gases


View Answer will be higher

Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?


aatmospheric pressure


bslightly above atmospheric pressure


c2-4 bars


d5-6 bars


View Answer 5-6 bars

In S.J. unit, one ton of refrigeration is equal to___________________?


a210 kJ/min


b21 kJ/min


c420 kJ/min


d840 kJ/min


View Answer 210 kJ/min

The boiling point of ammonia is___________________?


a -100°C


b-50°C


c– 33.3°C


d0°C


View Answer – 33.3°C

In vapor compression cycle, the condition of refrigerant is high pressure saturated liquid________________?


aafter passing through the condenser


bbefore passing through the condenser


cafter passing through the expansion or thiottle valve


dbefore entering the expansion valve



Clapeyron equation is a relation between___________________?


atemperature, pressure and enthalpy


bspecific volume and enthalpy


ctemperature and enthalpy


dtemperature, pressure, specific volur and’enthalpy



A refrigerant should have _____________________? Pick up the wrong statement


aTow specific heat of liquid


bhigh boiling point


chigh latent heat of vaporisation


dhigher critical temperature


View Answer high boiling point

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