21) Indication of amount of moisture in air is given by
a) DBT
b) WBT
c) DPT
d) Saturation temperature
22) The mass of water vapour in one m3 of dry air is defined as
a) Specific humidity
b) Humidity ratio
c) Absolute humidity
d) Relative humidity
23) The wet bulb depression is zero, when relative humidity is equal to
a) zero
b) 0.5
c) 0.75
d) 1.0
24) The heat production from a normal healthy mass when asleep is about
a) 45 W
b) 20 W
c) 60 W
d) 70 W
25) The human body feeds comfortable when the heat stored in the body is
a) Positive
b) Negative
c) Zero
d) Either zero or negative
26) The aspect ratio, for rectangular ducts, should not be greater than …….. in any case
a) 8
b) 10
c) 12
d) 16
27) A duct is said to be a low velocity duct if the velocity of air in the duct is upto
a) 600 m/min
b) 800 m/min
c) 1200 m/min
d) 1600 m/min
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