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

View solution

Q. Oil separator in a refrigeration cycle is installed

View solution

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

View solution

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

View solution

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

View solution

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

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 __________ power per tonne of refrigeration.

View solution

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

View solution

Q. The emissive power of a body depends upon its

View solution

Q. An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

View solution

Q. A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h1, h2 and h3 respectively. The average heat transfer coefficient for the cube is

View solution

Q. The dehumidification process, on the psychrometric chart, is shown by

View solution

Q. The vertical and uniformly spaced lines on a psychrometric chart indicates

View solution

Q. A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness

View solution

Q. In a refrigeration system, the expansion device is connected between the

View solution

Q. The heat rejection factor (HRF) is given by

View solution

Q. Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.

View solution

Q. In a domestic vapour compression refrigerator, the refrigerant commonly used is

View solution

Q. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)

View solution

Q. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.

View solution