Heat Transfer, Refrigeration and Air Conditioning Questions

• The rate of heat flow through a body is . The term x/kA is known as
• Which of the following refrigerant has the lowest boiling point?
• In a domestic vapour compression refrigerator, the refrigerant commonly used is
• The human body feels comfortable when the heat stored in the body is
• The freezing point of sulphur dioxide is
• Oil separator in a refrigeration cycle is installed
• In larger industrial and commercial reciprocating compression systems, refrigerent widely used is
• The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
• 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.
• Radiation is the process of heat transfer in which heat flows from a __________ , in a straight line, without affecting the intervening medium.
• The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T1 = Lowest absolute temperature, and T2 = Highest absolute temperature)
• In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
• The process, generally used in summer air conditioning to cool and dehumidify the air, is called
• The capillary tube, as an expansion device, is used in
• Which of the following statement is wrong?
• In which of the following refrigeration system, waste heat can be effectively used?
• During heating and dehumidification process, dry bulb temperature
• In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
• The process of undercooling is generally brought about by
• R-12 has the __________ freezing point.