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Mechanical Engineering Objective Questions { Refrigeration and Air Conditioning }

43. Accumulators should have adequate voltunl e to store refrigerant charge at least
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44. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
C.Remains same
D.Depends on other factors
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45. In vapour compression refrigeration system, refrigerant occurs as liquid between t- (a) condenser and expansion valve
A.(b) compressor and evaporator
B.(c) expansion valve and evaporator
C.(d) compressor and condenser
D.(e) none of the above.
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46. Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system
A.Strong solution to weak solution
B.Weak solution to strong solution
C.Strong solution to ammonia vapour
D.Ammonia vapour to weak solution
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47. .Efficiency of a Cornot engine is given as 80%. If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle
C.(e) 0.5
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48. Highest pressure encountered in a refrigeration system should be
A.Critical pressure of refrigerant
B.Much below critical pressure
C.Much above critical pressure
D.Near critical pressure
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49. a heat pump cycle operates between the condenser temperature of +27?C and evaporator temperature of ? 23?C, then the Camot COP will be
C.(d) 6
D.(e) 10.
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