Refrigeration and Air Conditioning

91. Vertical lines on pressure-enthalpy chart show constant

1. pressure lines
2. temperature lines
3. total heat lines
4. entropy lines
5. volume lines.

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92. Where does the lowest temperature occur in a vapour compression cycle ?

1. condenser
2. evaporator
3. compressor
4. expansion valve
5. receiver.

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93. Which of the following cycles uses air as the refrigerant

1. Ericsson
2. Stirling
3. Carnot
4. Bell-coleman
5. none of the above.

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94. Which of the following is not a desirable property of a refrigerant

1. high triiscibility with oil
2. low boiling point
3. good electrical conductor
4. large latent heat
5. non-inflammable.

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95. Which of the following refrigerants has lowest freezing point

1. Freon-12
2. NH3
3. C02
4. Freon-22
5. S02.

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