Refrigeration and Air Conditioning

81. The moisture in a refrigerant is removed by

1. evaporator
2. safety relief valve
3. dehumidifier
4. driers
5. expansion valve

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82. The refrigerant for a refrigerator should have

1. high sensible heat
2. high total heat
3. high latent heat
4. low latent heat
5. low sensible heat

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83. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

1. same
2. more
3. less
4. more or less depending on ambient conditions
5. unpredictable.

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84. The relative coefficient of performance is

1. actual COP/fheoretical COP
2. theoretical COP/actual COP
3. actual COP x theoretical COP
4. 1-actual COP x theoretical COP
5. 1-actual COP/fheoretical COP.

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85. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is

1. bigger
2. smaller
3. equal
4. smaller/bigger depending on capacity
5. unpredictable.

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86. The value of COP in vapour compression cycle is usually

1. always less than unity
2. always more than unity
3. equal to unity
4. any one of the above
5. none of the above.

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87. The vapour compression refrigerator employs the following cycie

1. Rankine
2. Carnot
3. Reversed Rankine
4. Brayton
5. Reversed Carnot.

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88. The vapour pressure of refrigerant should be

1. lower than atmospheric pressure
2. higher than atmospheric pressure
3. equal to atmospheric pressure
4. could be anything
5. none of the above.

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89. Under-cooling in a refrigeration cycle

1. increases COP
2. decreases COF
3. COP remains unaltered
4. other factors decide COP
5. unperdictable.

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90. Vapour compression refrigeration is some what like

1. Carnot cycle
2. Rankine cycle
3. reversed Camot cycle
4. reversed Rankine cycle
5. none of the above.

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