Heat Transfer, Refrigeration and Air Conditioning Questions

• During sensible heating of air __________ decreases.
• The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
• The material of pipe lines for a system using freon as a refrigerant should be
• A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
• The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
• The lowest temperature during the cycle in a vapour compression system occurs after
• When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
• The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is
• In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
• A refrigerant compressor is used to
• In aircraft, air refrigeration Cycle is used because of
• The pressure at the inlet of a refrigerant compressor is called
• The power per tonne of refrigeration is