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Mechanical Engineering Objective Questions { Refrigeration and AC }



15. In S.I. unit, one ton of refrigeration is equal to
A.- 210 kJ/min
B.21 kJ/min
C.420 kJ/min
D.840 kJ/min

16. The vapour compression refrigerator employs the following cycle
A.Rankine
B.Reversed Carnot.
C.Reversed Rankine
D.Brayton

17. Allowable pressure on high-pressure side or ammonia absorption system is of the order of
A.Atmospheric pressure
B.Slightly above atmospheric pressure
C.2-4 bars
D.5-6 bars

18. The moisture in a refrigerant is removed by
A.Evaporator
B.Safety relief valve
C.Dehumidifier
D.Driers

19. The condensing pressure due to the' presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,
A.Will be higher
B.Will be lower
C.Will remain unaffected
D.May be higher or lower depending upon the nature of non-condensable gases

20. Critical pressure of a liquid is the pressure 42) above which liquid will remain liquid
A.(b) above which liquid becomes gas
B.(c) above which liquid becomes vapour
C.(d) above which liquid becomes solid
D.(e) at which all the three phases exist together.

21. Criti5a1 temperature is the temperature above which
A.A gas will never liquefy
B.A gas will immediately liquefy
C.Water will evaporate
D.Water will never evaporate

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