Chapter 125

Question 0

The volume of standard air is:
A) 0.533 kg/m3 of dry air
B) 0.633 kg/m3 of dry air
C) 0.733 kg/m3 of dry air
D) 0.833 kg/m3 of dry air
E) 0.933 kg/m3 of dry air

Answer 0

D) 0.833 kg/m3 of dry air

Question 1

Air is approximately what composition by volume?
A) 72% N2 and 21% CO2
B) 79% O2 and 21% N2
C) 79% N2 and 21% O2
D) 79% CO2 and 21% O2
E) 79% H2 and 21% H2O vapour

Answer 1

C) 79% N2 and 21% O2

Question 2

The difference between the wet and dry bulb readings is called the____ _____ ______.

Answer 2

Wet bulb depression

Question 3

The term ____ ____ applies to the percentage of moisture in the air as compared to the amount of moisture that the air can hold at a specific temperature.

Answer 3

Relative humidity

Question 4

The values of standard temperatures and pressure of air that are used for evaluating air handling equipment are:
A) 1 kg of dry air at 0C and 101kPa abs
B) 1 kg of dry air at 20C and 125 kPa abs
C) 1 kg of dry air at 21C and 200 kPa abs
D) 1 kg of dry air at 21C and 101 kPa abs

Answer 4

D) 1 kg of dry air at 21*C and 101 kPa abs