Q. In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

View solution

Q. As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.

View solution

Q. The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

View solution

Q. Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

View solution

Q. The optimum effective temperature for human comfort is

View solution

Q. The wet bulb temperature lines, on the psychrometric chart, are curved lines.

View solution

Q. The sensible heat factor during cooling and dehumidification process is given by (where h1 = Enthalpy of air entering the cooling coil, h2 = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

View solution

Q. Thermal diffusivity is a

View solution

Q. The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.

View solution

Q. The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.

View solution

Q. In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

View solution

Q. The amount of radiation mainly depends upon the

View solution

Q. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

View solution

Q. The highest thermal diffusivity is of

View solution

Q. While designing the refrigeration system of an aircraft, the prime consideration is that the

View solution

Q. The heat transfer takes place according to

View solution

Q. An electrolux refrigerator is called a __________ absorption system.

View solution

Q. The heat transfer by radiation __________ a medium.

View solution

Q. Thermal conductivity of water __________ with rise in temperature.

View solution

Q. The critical radius is the insulation radius at which the resistance to heat flow is

View solution