Q. Air refrigerator works on

View solution

Q. The reciprocating refrigerant compressors are very suitable for

View solution

Q. The boiling point of carbon dioxide is

View solution

Q. The mass of water vapour present in __________ is called absolute humidity.

View solution

Q. The relative coefficient of performance is equal to

View solution

Q. The final relative humidity of the air during cooling and dehumidification is generally __________ than that of entering air.

View solution

Q. The emissivity of a polished silver body is __________ as compared to black body.

View solution

Q. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.

View solution

Q. R-11 has the highest critical point temperature.

View solution

Q. The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called

View solution

Q. The boiling point of ammonia is

View solution

Q. The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)

View solution

Q. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

View solution

Q. In a black body, all radiations are rejected.

View solution

Q. Most air cooled condensers are designed to operate with a temperature difference of

View solution

Q. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.

View solution

Q. The ratio of surface convection resistance to the internal conduction resistance is known as

View solution

Q. Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

View solution

Q. Kirchhoff's law states that

View solution

Q. Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.

View solution