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

36.	As warns air cools, its relative humidity................

	A. Decreases	B. Increases
	C. Remains unchanged	D. Unpredictable
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : Increases Report error Hide Error Report Box

37.	In air-conditioning system the comfort conditions are defined by

	A. 15°C DBT, 90% RH	B. 25°C DBT, 35% RH
	C. 20°C DBT, 80% RH	D. 22°C DBT, 60% RH
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : D Solution : 22^oC DBT, 60% RH Report error Hide Error Report Box

38.	In a cooling tower, the dissipation of heat is mainly due to

	A. Evaporation	B. Conduction
	C. Convection	D. Radiation
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : A Solution : Evaporation Report error Hide Error Report Box

39.	In air-conditioning system the quantity of free air required per person is usually taken

	A. 0.8 m3/min	B. 1.2m³/min
	C. 3m3/min	D. 5m3/min
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : 1.2m³/min Report error Hide Error Report Box

40.	Which of the following permanents remain constant during sensible heating/cooling?

	A. Enthalpy	B. Wet bulb temperature
	C. Humidity ratio	D. Dry bulb temperature
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : C Solution : Humidity ratio Report error Hide Error Report Box

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