Latest Refrigeration and Air Conditioning - Mechanical Engineering Multiple choice Questions and Answers pdf

31.    Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
(a)    electrically operated throttling valve
(b)    manually operated valve
(c)    thermostatic valve
(d)    capillary tube
(e)     expansion valve.
Ans: d

32.    Air refrigeration operates on
(a)    Carnot cycle
(b)    Reversed Carnot cycle
(c)    Rankine cycle
(d)    Erricson cycle
(e)    Brayton cycle.
Ans: e

33.    Air refrigeration cycle is used in
(a)    domestic refrigerators
(b)    commercial refrigerators
(c)    air conditioning
(d)    gas liquefaction
(e)    such a cycle does not exist.
Ans: d

34.    In a vapour compression cycle, the refrigerant immediately after expansion valve is
(a)     liquid 
(b)     sub-cooled liquid
(c)     saturated liquid
(d)     wet vapour    
(e)     dry vapour.
Ans: d

35.    The vapour pressure of refrigerant should be
(a)    lower than atmospheric pressure
(b)    higher than atmospheric pressure
(c)    equal to atmospheric pressure
(d)    could be anything
(e)    none of the above.
Ans: b

36.    For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
(a)    small 
(b)    high
(c)    euqal 
(d)    anything
(e)    under some conditions small and under some conditions high.
Ans: a

37.    The bank of tubes at the back of domestic refrigerator are
(a)    condenser tubes
(b)    evaporator tubes
(c)    refrigerant cooling tubes
(d)    capillary tubes
(e)    throttling device.
Ans: a

38.    The higher temperature in vapour compression cycle occurs at
(a)     receiver 
(b)     expansion valve
(c)     evaporator     
(d)     condenser discharge
(e)     compressor discharge.
Ans: e

39.    Highest temperature encountered in refrigeration cycle should be
(a)    near critical temperature of refrigerant
(b)    above critical temperature
(c)    at critica. temperature
(d)    much below critical temperature
(e)    could be anywhere.
Ans: d

40.    In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is
(a)    less than 2 kg
(b)    more than or equal to 3.65 kg
(c)    more than 10 kg
(d)    there is no such consideration
(e)    pone of the above.
Ans: b

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