Absolute or specific humidity is

Absolute or specific humidity is

a) the actual mass of moisture present in a specific amount of air
b) the maximum mass of moisture that a specific amount of air can hold
c) the ratio of the mass of moisture contained in a specific amount of air to the maximum amount of moisture this specific amount of air can contain
d) the mass of moisture present in a specific amount of air at that absolute temperature
e) a specific amount of air saturated with moisture





Answer: A

The term "relative humidity" applies to

The term "relative humidity" applies to

a) the percentage of moisture in the air as compared to the amount of moisture the air can hold at a specific temperature
b) the weight of the moisture in the air
c) the dryness fraction of the air
d) the amount of moisture in the air
e) the amount of humidity in the air







Answer: A

Air conditioning involves

Air conditioning involves

a) only the cooling of the air in a conditioned space
b) the control of the air temperature, the control of humidity, air circulation, and the removal of contaminants
c) only the control of air temperature
d) only the control of humidity and temperature
e) only air purification






Answer: B

Relative humidity is

Relative humidity is

a) the ratio of water vapour in the air compared to the total amount water vapour the air could contain at a given temperature
b) equal to the dry bulb temperature divided by the wet bulb temperature
c) equal to the wet bulb temperature divided by the dry bulb temperature
d) the ratio of the mass of water vapour divided by the mass of dry air
e) the ratio of the mass of water vapour divided by the mass of wet air







Answer: A

Dalton's Law of partial pressure states that

Dalton's Law of partial pressure states that

a) for every pressure there is an equal and opposite pressure
b) in a mixture of two or more gases each will exert a partial pressure which is equal to the pressure that it would exert if it filled that space alone
c) the pressure exerted by two or more gases on the walls of the containing vessel is equal to a constant
d) the sum of the mass of air and water vapour in a vessel is equal to the total pressure
e) water vapour must be included when calculating air pressures






Answer: B

Which of the following instruments use a battery operated fan to draw air over thermometer bulbs?

Which of the following instruments use a battery operated fan to draw air over thermometer bulbs?

a. Hydrometer
b. Aspirating psychrometer
c. Sling psychrometer
d. Dry psychrometer
e. Humidistat






Answer: B