176. -Usually central air conditioning system as compared to individual system has
A.Higher overall efficiency
B.Lower overall efficiency
C.Same overall efficiency
D.#NAME?

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177. Enthalpy of air-vapour mixture consists of
A.Sensible heat of dry air between 0?C and dry bulb temperature
B.Total enthalpy of the contained water vapour at saturation temperature
C.Heat of superheat of the contained water vapour
D.All of the above

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178. Usually the quantity of free air per person in air conditioning system is taken as
A.1.2 m3/sec
B.1.2 m3/min
C.1.2 m3/hr
D.6 m3/min

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179. On psYchrometric chart, relative humidity lines are
A.Horizontal
B.Vertical
C.Straight inclined sloping downward to the right
D.Curved

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180. Humidification process involves
A.An increase in relative humidity
B.A decrease in relative humidity
C.An increase in specific humidity
D.A decrease in specific humidity

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181. Air is normally dehumidified by
A.Injecting water
B.Passing steam
C.Heating
D.Cooling

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182. At 100% relative humidity
A.Dew point equals wet bulb temperature
B.Dry bulb temperature equals wet bulb temperature
C.Saturation and dew point temperatures become equal
D.All of the above

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