Pneumatics Final

Question 1

What are the two categories of fluid power?

Answer 1

Hydraulics & pneumatics

Question 2

What are the three things that fluid does?

Answer 2

1. It flows
2. Takes the shape of its container
3. Exerts a pressure

Question 3

Difference between liquids and gases?

Answer 3

Liquids have a fixed volume and cannot be compressed, gases can be compressed.

Question 4

Definition of pressure?

Answer 4

Force per unit area

Question 5

3 ways pressure can be created?

Answer 5

1. Force applied
2. Column of fluid
3. Resistance to flow

Question 6

Definition of a vacuum?

Answer 6

Any pressure less than atmospheric

Question 7

Definition of an orfice?

Answer 7

Any restricted passage

Question 8

The amount of flow through an orfice is determined by 4 thing?

Answer 8

1. Size of orfice
2. Viscosity of fluid
3. Pressure drop
4. Temperature

Question 9

What is Boyles law?

Answer 9

As volume increases, pressure decreases

Question 10

What slows down the cylinder at the end of its stroke?

Answer 10

Cushion valves

Question 11

Check valves allow what?

Answer 11

Flow in only one direction

Question 12

In a multistage compressor which piston is larger?

Answer 12

The 1st stage is always larger than the 2nd stage

Question 13

What is the benefit of having a multistage compressor?

Answer 13

Builds more pressure.

Question 14

Pressure is measured in what?

Answer 14

PSI

Question 15

Flow rate in pneumatics is measured In what?

Answer 15

CFM

Question 16

You control pressure at what 2 points?

Answer 16

At the compressor and after the receiver tank

Question 17

What are the 3 types of center conditions?

Answer 17

1. Blocked
2. Exhaust
3. Pressure

Question 18

Flow controls are in 2 major categories, what are they?

Answer 18

1. Fixed
2. Adjustable

Question 19

Give an example of fixed and adjustable flow controls.

Answer 19

Fixed - orfice plate
Adjustable - needle valve

Question 20

This valve increases exhaust flow in a dcv?

Answer 20

Quick exhaust valve

Question 21

Air is drawn into a fluid power motor by what?

Answer 21

The smallest volume chamber

Question 22

To power a double acting cylinder you have to have at least a what?

Answer 22

4 way dcv

Question 23

Formulas for pressure, force and area?

Answer 23

Force - P x A = F
Pressure - F/A =P
Area - P/F = A

Question 24

What device cools between multistage compression?

Answer 24

Intercooler

Question 25

Which device cools after compression?

Answer 25

Aftercooler

Question 26

Which valve unloads pressure from compressor head when compressor shuts off?

Answer 26

Unloading valve

Question 27

If unloading valve does not shut off than what is wrong?

Answer 27

Bad check valve

Question 28

Most common non-positive displacement motor?

Answer 28

Centrifugal

Question 29

Limiting flow in a fluid power system means you limit what?

Answer 29

Speed

Question 30

Limiting pressure in a fluid power system means you limit?

Answer 30

Force

Question 31

3 things that a valve controls?

Answer 31

1. System pressure 2. Direction of flow 3. Rate of flow

Question 32

Adjustable valve that only deals with down stream pressure is what?

Answer 32

Regulator

Question 33

Non-adjustable valve that only deals with upstream pressure?

Answer 33

Safety relief valve

Question 34

What do cushion valves protect against?

Answer 34

Shock and hammer

Question 35

What are 3 types of contamination?

Answer 35

1. Built in 2. Generated 3. Ingested

Question 36

What does FRL stand for?

Answer 36

Filter, regulator, lubricator

Question 37

Why do we use lubrication?

Answer 37

To lubricate seals, reduce friction and heat and to extend the life of something

Question 38

What are good work practices?

Answer 38

Put parts on rags on their sides, wrap zip ties around hoses to be able to identify where they go.

Question 39

What do you always have to have after an aftercooler?

Answer 39

Moisture separator

Question 40

How should you always meter flow to a cylinder?

Answer 40

When in doubt meter out

Question 41

Definition of a valve?

Answer 41

Consists of a body and a moving part which connects and disconnects within the body

Question 42

Best place for a flow control?

Answer 42

At or close to the cylinder