Q. When the discharge pressure is too high in a refrigeration system, high pressure control is installed to stop the compressor.

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Q. A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.

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Q. The wet bulb temperature during sensible cooling of air

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Q. In absorption vapour systems, the refrigerant widely used is R-12.

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Q. Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.

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Q. Dry bulb temperature is the temperature of air recorded by a thermometer, when

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Q. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

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Q. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

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Q. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The by-pass factor of the heating coil is

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Q. An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by

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Q. R-12 is generally preferred over R-22 in deep freezers since

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Q. The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

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Q. During sub-cooling, sensible heat from a liquid refrigerant is removed.

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Q. The expression is used for calculating relative humidity.

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Q. If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

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Q. The wet bulb depression indicates __________ humidity of the air.

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Q. The refrigerant widely used in domestic refrigerators is

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Q. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmittivity (τ) = 0, then the body is said to be a

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Q. Prandtl number (PN) is given by PN = μ.cp/k.

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Q. In a vapour compression system, the condition of refrigerant before passing through the condenser is

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