Q. A composite slab has two layers of different materials with thermal conductivities k1 and k2. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

View solution

Q. The critical temperature is the temperature

View solution

Q. The evaporator changes the low pressure liquid refrigerant from the expansion valve into

View solution

Q. For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is

View solution

Q. In case ofsensible cooling of air, the coil efficiency is given by

View solution

Q. The cooling system used for supersonic aircrafts and rockets is

View solution

Q. Which of the following statement is correct?

View solution

Q. The desirable property of a refrigerant is

View solution

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

View solution

Q. The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to

View solution

Q. The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called

View solution

Q. The transfer of heat by molecular collision is smallest in

View solution

Q. During dehumidification process, the relative humidity

View solution

Q. The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.

View solution

Q. The ratio of actual heat transfer to the maximum possible heat transfer is known as heat exchanger effectiveness.

View solution

Q. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.

View solution

Q. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

View solution

Q. The unit of overall coefficient of heat transfer is

View solution

Q. Most thermostatic expansion valves are set for a superheat of

View solution

Q. For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is

View solution