Chapter 13

Question 1

2 stage compressor

Answer 1

Consists of an intake, first stage compressor, inter cooler, second stage compressor

Uses less energy than an equivalent one stage

Question 2

Most common toe of positive displacement compressor

Answer 2

Piston or reciprocating Compressor

The screw compressor is another type but less common

Question 3

Two types of screw compressors

Answer 3

Dry

Oil flooded

Question 4

Single stage compressor

Answer 4

Limit is 150 psi

Not effective for high pressure situation due to the large amount of heat generated

Don’t think that a angle stage with two separate compression cylinders is a two stage

Question 5

Before servicing a compressor

Answer 5

Turn off compressor drive

Question 6

Always wear

Answer 6

Safety goggles

Question 7

Keep air intake

Answer 7

Well ventilated

Question 8

Lock and tag each vent

Answer 8

OPEN

If they are closed a sudden pressure loss will create a vacuum and can cause collapses

Question 9

Do not touch

Answer 9

Pressurized air lines or components

Question 10

Also wear

Answer 10

Hearing protection

Question 11

All compressors have

Answer 11

Intake filter element
Air preparation package
Air distribution package

Question 12

Two types of valves

Answer 12

Poppet type

Sliding or shear action type valve

Question 13

Who is responsible for standardizing pneumatic symbols $

Answer 13

ANSI

Question 14

Why should thence be locked in the open position when working on a pressurize system $

Answer 14

Because closed Vince and a sudden repressurization can cause a vacuum and collapse sensitive components

Question 15

What is the practical pressure limit for single stage $

Answer 15

150 psi

Question 16

Is the single stage or two-stage compressor more efficient $

Answer 16

Two stage

Question 17

Three major types of air compressors $

Answer 17

Reciprocating, rotary screw, centrifugal

Question 18

What are the most common type of positive displacement compressor $

Answer 18

Piston or reciprocating compressors

Question 19

What are more common

Dry or oil flooded screw compressors $

Answer 19

Oil flooded

Question 20

What are the three types of after coolers $

Answer 20

Air cooled
water cooled
refrigerated

Question 21

What is a FRL $

Answer 21

A filter, pressure regulator, and lubricator is the FRL unit

Question 22

When should metal bowls be used for filtering and lunricating $

Answer 22

High pressure and high temperature

Question 23

Two main types of control valves $

Answer 23

Poppet

DCV

Question 24

Why do some air cylinders have cushions

$

Answer 24

Reduce cylinder shock and noise if piston suddenly slammed