Air Dryers Review

Question 1

True or False;
Chemical type absorption dryers can be regenerated:​

Answer 1

false

Question 2

What are the four main categories of Air Dryers?

Answer 2

Adsorption
Absorption
Cooling
Mechanical

Question 3

Desiccant dryers may use __________ to take moisture from the gas/air.

Answer 3

Silica Gel
Activated Alumina
Molecular Sieves

Question 4

True or False;
In absorption dryers, switching valves are used to route the flow of air/gas through the drying and reactivation cycle.

Answer 4

False

ADSORPTION

Question 5

Condensation does not occur within a compressor because:

Answer 5

Increased temperature enables the air to hold more moisture.

Question 6

The saturation point of air will vary with changes in:

Answer 6

pressure and temperature

Question 7

A physical attraction of water vapour to the surface of a porous substance describes a(n) _________ dryer.

Answer 7

Adsorption

Question 8

The greatest dew point reduction can be achieved using:

Answer 8

Desiccants

Question 9

True or False;
Air or gas at a constant temperature will be able to hold less moisture as the pressure increases.

Answer 9

True

Question 10

True or False;
In absorption dryers the chemical reaction results in a liquid becoming a solid.

Answer 10

False

-solid to liquid
salt to brine

Question 11

Refrigerant air/gas dryers can be divided into two main parts:

Answer 11

Air to Air circuit
Refrigerant to Air circuit

Question 12

The amount of moisture actually contained in the air compared to the maximum amount that the air could hold refers to:

Answer 12

Relative Humidity

Question 13

True or False;
Lubricants used for valves on heated regeneration dryers must be suitable for high temperatures:

Answer 13

True

its in the name ‘heated’

Question 14

High differential pressures across a desiccant dryer could be caused by:

Answer 14

The desiccant bed being compacted

Question 15

Excessive inlet air/gas flow rates through a chemical dryer will result in:

Answer 15

the air/gas having inadequate time with the deliquescent

Question 16

Poor dew points on a regenerative type dryer could be caused by:

Answer 16

High temperature of the desiccant bed​

Poor cycling
​
Flow rate too high

Question 17

The heated regeneration desiccant dryer should be monitored to verify that it cycles through:

Answer 17

drying, reactivation, cooling

Question 18

Reactivation of a desiccant dryer is normally accomplished by:

Answer 18

Heating the desiccant​

Routing part of the flow through the desiccant

Question 19

Failure of switching valves to move during cycle changes can result in:

Answer 19

Inadequate reactivation​

Saturation of the drying bed​

Possible stoppage of gas flow

Question 20

Demister pads are commonly used at the:

Answer 20

Exit of Process Vessels

Question 21

What is often found in the line before an air dryer to help reduce the load on the dryer?

Answer 21

Cyclonic Separator

Question 22

True or False;
Cyclone separators are most often found before the compressor aftercooler.

Answer 22

False

most often after