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

Right

Wrong

Answer is:

Right

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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

it considerably reduces mass of the system

it improves the C.O.P., as the condenser is small

the positive work in isentropic expansion of liquid is very small

it leads to significant cost reduction

Answer is:

the positive work in isentropic expansion of liquid is very small

221) The unit of overall coefficient of heat transfer is

W/m²K

W/m²

W/mK

W/m

Answer is:

W/m²K

222) Most thermostatic expansion valves are set for a superheat of

5 Degree Centigrade

10 Degree Centigrade

15 Degree Centigrade

20 Degree Centigrade

Answer is:

5 Degree Centigrade

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

reciprocating

rotating

centrifugal

screw

Answer is:

centrifugal

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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

Right

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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

the positive work in isentropic expansion of liquid is very small

221) The unit of overall coefficient of heat transfer is

W/m2K

222) Most thermostatic expansion valves are set for a superheat of

5 Degree Centigrade

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

centrifugal

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

W/m²K