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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