MECHANICAL ENGINEERING REFRIGERATION & AIR CONDITIONING MCQs

In a refrigeration cycle the heat is rejected by refrigerant at

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The flow of the refrigerant in a refrigeration cycle is controlled by

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In a mechanical refrigeration system the highest temperature of refrigerant occurs

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The chemical formula for Freon-12 is

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A device designed to remove moisture from a refrigerant is called

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The leaks of refrigerant from a cycle may be detected by

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In a refrigeration system, if the compressor short cycles, the probable cause could be

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In case of freon as refrigerant the pipe lines should be of

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he heat removed capacity of a one ton refrigerator is

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Dry bulb temperature depends on

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A condenser removes from the refrigerant

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A critical temperature is the temperature

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Which type of compressor is commonly used in room air-conditioner

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A refrigerant cycle is usually a

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Which of the following is not a property of Carbondioxide?

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Reversed Carnot cycle assumes that all processes in the cycle are

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Sometimes refrigeration plants use cooling towers. The water cooled in those towers is supplied

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When moisture is removed from air at constant dry bulb temperature the process is known as

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The ratio of sensible heat to total heat is known as

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In cooling towers the heat is dissipated mainly by

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The relation between vapour pressure to the enthalpy of vaporisation is expressed in

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he difference between dry bulb temperature and wet bulb temperature, is called

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According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

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The automobile radiator is a heat exchanger of

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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

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The freon group of refrigerants are

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In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

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Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?

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A boot-strap air cooling system has

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If a gas is to be liquified, its temperature must be

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In case of liquids and gases, the heat transfer takes place according to

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he refrigerant supplied to a compressor must be

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The pressure at the outlet of a refrigerant compressor is called

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The evaporator used in house-hold refrigerators is

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The air cooling system mostly used in transport type aircrafts is

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The ratio of energy transferred by convection to that by conduction is called

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The value of the wave length for maximum emissive power is given by

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The heat of sun reaches to us according to

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The undesireable property of a refrigerant is

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The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

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The lowest temperature during the cycle in a vapour compression system occurs after

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