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Mechanical Engineering Objective Questions { Refrigeration and Air Conditioning }

127. The refrigerator which does not require compressor is known as
A.Vapour absorption refrigerator
B.Vapour compression refrigerator
C.Electrolux refrigerator
D.Carnot refrigerator
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128. Which of the following is not a desirable property of the refrigerant in a vapour compression refrigerator
A.High h.p. per ton of refrigeration
B.High critical temperature and pressure
C.Low vapour and liquid densities
D.High latent heat of vaporisation and low specific heat
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129. Which of the following is not a desirable property of good insulating material
A.Light weight
B.High heat conductivity
D.Low initial cost
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130. The function of brine agitator in ice plant is to
A.Increase refrigeration effect
B.Increase COP
C.Reduce compressor power
D.Obtain uniform temperature of brine
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131. One of the reasons for an evaporator to not cool may be
A.Frozen oil
B.Faulty thermostat
C.Leaking refrigerant
D.Insufficient lubricant in refrigerant
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132. Choose the wrong statement
A.Liquid refrigerant is charged into the compressor suction or discharge valve port
B.System is discharged easily with refrigerant in vapour form than in liquid form
C.An absorption system is quiet in operation
D.Non-condensable gases raise the condensing pressure above that required for the condensing temperature
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133. For same compressor work, COP of refrigerator as compared to COP of heat pump is
D.May be high or low
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