Q. The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

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Q. The temperature below which a gas is always liquified, is known as critical temperature.

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Q. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.

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Q. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

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Q. When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,

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Q. When there is an addition of water vapour to the air of enclosed space, a gain in __________ is said to occur.

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Q. The relative humidity __________ as air gets drier.

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Q. The expression is used for calculating

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Q. The critical thickness of insulation for a sphere is

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Q. The difference between dry bulb temperature and dew point temperature, is called

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Q. Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

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Q. Film coefficient is defined as the ratio of

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Q. Thermal conductivity of solid metals __________ with rise in temperature.

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Q. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

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Q. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

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Q. Which of the following refrigerant is highly toxic and flammable?

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Q. The unit of Stefan-Boltzmann constant is

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Q. In a vapour compression system, the condition of refrigerant is dry saturated vapour

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Q. An evaporator is also known as

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Q. The rate of heat flow through a body is . The term is known as temperature gradient.

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