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Heat Transfer, Refrigeration and Air Conditioning

1.

In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Answer: D

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2.

A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

Answer: D

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Answer: B

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4.

As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.

Answer: B

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5.

The relative humidity decreases as air gets wet.

Answer: A

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6.

At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.

Answer: A

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7.

During cooling and dehumidification, dry bulb temperature

Answer: C

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8.

The water, alcohol and ammonia have same refrigerating effect at different altitudes.

Answer: B

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9.

Which of the following refrigerant has the lowest freezing point?

Answer: C

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