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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Q. Oil separator in a refrigeration cycle is installed

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Q. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is

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Q. The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.

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Q. The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

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Q. The human body feels comfortable when the heat stored in the body is

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Q. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.

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Q. The amount of heat flow through a body by conduction is

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Q. The emissive power of a body depends upon its

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