Humidity Control

Question 1

A ratio of the moisture content in the air compared to the maximum amount of moisture that the air can hold at its current temperature describes ____.

Answer 1

relative humidity (rh)

Question 2

Human comfort requires a relative humidity between ____.

Answer 2

30% and 50%

Question 3

A humidistat is a control device that responds to ____.

Answer 3

humidity

Question 4

A humidifier’s solenoid valve opens when the ____ running.

Answer 4

furnace and blower are

Question 5

An electromechanical humidistat’s hygroscopic element responds to a decrease in humidity by ____.

Answer 5

shrinking

Question 6

Which one of the four types of evaporative humidifiers can be used only in low-capacity applications?
Fixed Filter
Plate
Rotating Disk
Rotating Drum

Answer 6

Plate

Question 7

Which humidifier uses a pad consisting of numerous layers of tight metallic mesh wetted by water delivered from above?

Answer 7

Fixed filter

Question 8

Which humidifier uses a series of porous materials that wick water upward to be evaporated by passing air?

Answer 8

Plate

Question 9

The ideal water to use in humidifiers to prevent both duct deposits and foreign matter from entering the air-stream is ____.

Answer 9

distilled water