Refrigeration and Air Conditioning

1. Clapeyron equation is applicable for registration at

1. saturation point of vapour
2. saturation point of liquid
3. sublimation temperature
4. triple point
5. critical point.

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2. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

1. Ammonia
2. Carbon dioxide
3. Freon
4. Brine
5. Hydrocarbon refrigerant.

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3. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be

1. 0.2
2. 1.2
3. 5
4. 6
5. 10

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4. A standard ice point temperature corresponds to the temperature of

1. water at 0°C
2. ice at - 4°C
3. solid and dry ice
4. mixture of ice, water and vapour under equilibrium conditions under NTP conditions
5. mixture of ice and water Under equilibrium conditions.

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5. Absorption system normally uses the following refrigerant

1. Freon-11
2. Freon-22
3. C02
4. S02
5. ammonia.

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6. Accumulators should have adequate volume to store refrigerant charge at least

1. 10%
2. 25%
3. 50%
4. 75%
5. 100%.

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7. Air refrigeration cycle is used in

1. domestic refrigerators
2. commercial refrigerators
3. air conditioning
4. gas liquefaction
5. such a cycle does not exist.

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8. Air refrigeration operates on

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

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9. Allowable pressure on high-pressure side or ammonia absorption system is of the order of

1. atmospheric pressure
2. slightly above atmospheric pressure
3. 2-4 bars
4. 5-6 bars
5. 7-10 bars.

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10. Ammonia is

1. non-toxic
2. non-inflammable
3. toxic and non-inflammable
4. highly toxic and inflammable
5. none of the above.

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