Book 2: 1-10 - Humidification

Question 1

From a health standpoint, humidity between ______ is desirable.

Select one:

A. 35% and 50%
B. 55% and 80%
C. 15% and 30%
D. 45% and 60%
E. 25% and 40%

Answer 1

A. 35% and 50%

Question 2

Calculate the relative humidity of a sample of air that at 21°C (70°F) holds 0.01 kg (0.022 lb) of moisture if the maximum that it can hold at this temperature is 0.015 kg (0.033 lb).

Select one:

A. 93.3%
B. 10.7%
C. 6.7%
D. 25.8%
E: 0.33%

Answer 2

C. 6.7%

Question 3

When the air temperature is raider without a change in moisture content the relative humidity will:

Select one:

A. Decrease
B. Lose latent heat
C. Gain latent heat
D. Not change
E. Increase

Answer 3

A. Decrease

Question 4

One of the wetted element humidifiers group is the _____ type.

Select one:

A. Power
B. Spray
C. Pan
D. Wet
E. Steam

Answer 4

A. Power

Question 5

The pan type humidifier has a/an:

Select one:

A. Moderate humidification rate
B. Low humidification rate
C. Very high humidification rate
D. Very low humidification rate
E. High humidification rate

Answer 5

D. Very low humidification rate

Question 6

When the air washer is used for humidification, the spray water must be _____ temperature of the entering air.

Select one:

A. Cooled below the dew point
B. Heated above the dry bulb
C. Cooled below the wet bulb
D. Heated above the dew point
E. Cooled below the dry bulb

Answer 6

D. Heated above the dew point

Question 7

Atomizing humidifiers have the disadvantage that:

Select one:

A. The water sprayed into the air evaporates leaving the salts that appear as a fine white Dust
B. They have no float valve
C. They do not require motor
D. They have no moving parts
E. They add moisture to the air

Answer 7

A. The water sprayed into the air evaporates leaving the salts that appear as a fine white dust

Question 8

One of the types of humidification used to residential purposes is the _____ humidifier.

A. Pan
B. Dry element
C. Air washer
D. Pot
E. Steam

Answer 8

A. Pan

Question 9

An air washer is installed on the suction side of the fan so as to:

Select one:

A. Avoid leakage of water through the joints
B. Add moisture to the air
C. Add latent heat to the air
D. Avoid leakage of air through the joints
E. Add sensible heat to the air

Answer 9

A. Avoid leakage of water through the joints

Question 10

One of the types of humidifiers used for residential purposes is the _____ humidifier.

Select one:

A. Steam
B. Dry element
C. Pot
D. Atomizing
E. Air washer

Answer 10

D. Atomizing