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Mechanical Engineering Objective Questions { Refrigeration and AC }



57. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents
A.Condensation of the refrigerant vapour
B.Evaporation of the refrigerant liquid
C.Compression of the refrigerant vapour
D.Metering of the refrigerant liquid

58. Freon group of refrigeraW are
A.Inflammable
B.Non-toxic and non-inflammable.
C.Non-inflammable and toxic
D.Non-toxic and inflammable

59. Ammonia is
A.Non-toxic
B.Non-inflammable
C.Toxic and non-inflammable
D.Highly toxic and inflammable

60. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at
A.Suction of compressor
B.Delivery of compressor
C.High pressure side colse to receiver
D.Low pressure side near receiver

61. Short horizontal lines on pressure-enthalpy chart show
A.Constant pressure lines
B.Constant temperature lines
C.Constant total heat lines
D.Constant entropy lines

62. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process
A.Involves no change in volume
B.7.72. One ton of the refrigeration is
C.Takes place at constant entropy
D.Takes place at constant enthalpy takes place at constant pressure.

63. One ton of the refrigeration is
A.The standard unit used in refrigeration problems
B.The cooling_ effect produced by melting 1?ton of ice
C.The refrigeration effect to freeze 1 ton of water at 0?C into ice at 0?C in 24 hours
D.The refrigeration effect to produce 1 ton of ice at NTP conditions

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