R.A.C. - Question & Answer with solution in Hindi & English

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Mechanical Engineering : R.A.C. Question & Answer in English

31.	The refrigerant- 717 is -

	A. Sulphur dioxide	B. Ammonia
	C. Methyl chloride	D. Carbon dioxide
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : Ammonia Report error Hide Error Report Box

32.	Regarding ‘Dry ice’ which of the following statements is correct?

	A. It does not contain impurities	B. It is solidified form of CO²
	C. It is free from water	D. None of the above
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : It is solidified form of CO₂ Report error Hide Error Report Box

33.	The colour of flame during halide torch test for refrigerant leaks will change to

	A. Gray	B. Blue of bright green
	C. Black	D. Pink of red
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	Answer & Solution Hide Solution Box Answer : B Solution : Blue of bright green Report error Hide Error Report Box

34.	During sensible heating of most air, enthalpy

	A. Increases	B. Deceases
	C. Remains constant	D. None of the above
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	Answer & Solution Hide Solution Box Answer : A Solution : Increases Report error Hide Error Report Box

35.	Absolute humidity is the mass of water vapour present in

	A. 1 kg of dry air	B. 1 m³ of dry air
	C. 1 kg of wet air	D. 1 m3 of wet air
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : 1 m³ of dry air Report error Hide Error Report Box

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