Explanation: Refrigeration is the process of removing heat from a substance and cooling it to a temperature or below the actual temperature. The refrigeration unit is expressed in terms of a ton of refrigeration (TR).

Explanation: Coefficient of Performance is generally referred to as C.O.P. for Refrigeration, which is used to measure the capacity or level up to which the refrigeration will occur.

Explanation: Air refrigeration system is used mainly due to light in weight, smaller and environment friendly due to use of air as a refrigerant. Also, it has a higher co-efficient of performance.

Explanation: In lithium bromide absorption refrigeration system it is necessary to keep the refrigeration temperature above 0°C as it is the freezing point of water. Water is used as a refrigerant in the system.

Explanation: Generally, unit like N/mm2, N/m2, KN/mm2 and MN/mm2 etc. are used but the S.I. unit used is N/m2 i.e. Pascal.

Explanation: Natural Refrigeration process is dependent on the local conditions like temperature of surrounding, pressure at which it occurs, and volume of the refrigerant, etc. hence it cannot be predicted exactly.

Explanation: As the operating pressure reduces, the change in work done decreases. Hence the C.O.P of refrigeration increases.

Explanation: Simple VAR uses a generator to do work as well as a pump to pressurize the liquid to the generator. So, total work done is the summation of work done by a pump and generator. The refrigeration effect is the heat absorbed in the evaporator. But as in the case of Electrolux refrigerator pump is not present. It is the VAR system with no liquid pump; hence, it is the key difference between Simple VAR and Electrolux refrigerators.

Explanation: Efficiency is the ratio of work done to heat supplied, whereas C.O.P is the ratio of Refrigeration effect to work done. Hence it is totally independent quantity.

= 192 kJ/min.

Explanation: Water is used as a refrigerant in Lithium Bromide Absorption Refrigeration system whereas lithium bromide, which is highly hydroscopic salt, is used as an absorbent. Lithium Chromate is used a corrosion inhibitor.

Explanation: In the Electrolux refrigerator, ammonia is used as a refrigerant, and in the case of Li-Br water system water is used as a refrigerant due to their desirable properties to produce refrigeration effect.

= 4.75.

Explanation: As a sufficient amount of air is obtained while aviation of air crafts, the only thing is to reduce its velocity, and then it can be used for air conditioning in air crafts.

Explanation: Air Conditioning is the process of removing heat and controlling the humidity of air in an enclosed space to achieve a more comfortable interior environment.

Explanation: In Winter, the weather is dry and cold, so the process of heating and humidification is done to get the desired comfort conditions.

Explanation: It is because in vapor-cycle the disadvantage was that due to the leakage loss of fluid it would cause the aircraft to be complete without cooling.

Explanation: In Summer, the weather is humid and hot, so the process cooling and dehumidification is done to get the desired comfort conditions.

= 4.