Module Self Test Questions

Question 1

In a deliquescent dryer, is the flow normally upward or downward through the bed?

Answer 1

Upward

Question 2

What is relative humidity?

Answer 2

A comparison of the amount of water air holds to the maximum amount it could hold if saturated.

Question 3

Define Dewpoint

Answer 3

The temperature to which air must be cooled for condensation of water vapour to begin.

Question 4

True or False:
Regenerative dryers often use a portion of the dried air for regeneration of the saturated desiccant bed.

Answer 4

True

Question 5

True or False:
Desiccants are most often a salt of some kind.

Answer 5

False;
Common desiccants are;
activated alumina, granular and bead type silica gels, molecular sieves.

Question 6

True or False:
There are forms of energy other than electricity that can be very harmful and equipment must be locked out to prevent injury.

Answer 6

True

Question 7

True or False:
As a sample of air that is partially saturated cools, relative humidity rises.

Answer 7

True

Question 8

True or False:
It takes more heat energy to change the phase of a volume of liquid to a vapour without any change in temperature than it does to increase its temperature 1 degree without any phase change.

Answer 8

True

why? who knows

Question 9

Name the four categories of air dryers:

Answer 9

Adsorption
Absorption
Refrigeration
Mechanical

Question 10

When working on a dryer, you must ________ and __________ the complete system, as well as lockout the compressor whenever possible.

Answer 10

Depressurize and Isolate