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Fluid Power > Pneumatics Final > Flashcards

Pneumatics Final Flashcards

1
Q

What are the two categories of fluid power?

A

Hydraulics & pneumatics

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2
Q

What are the three things that fluid does?

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

Difference between liquids and gases?

A

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

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4
Q

Definition of pressure?

A

Force per unit area

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5
Q

3 ways pressure can be created?

A
  1. Force applied
  2. Column of fluid
  3. Resistance to flow
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6
Q

Definition of a vacuum?

A

Any pressure less than atmospheric

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7
Q

Definition of an orfice?

A

Any restricted passage

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8
Q

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

A
  1. Size of orfice
  2. Viscosity of fluid
  3. Pressure drop
  4. Temperature
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9
Q

What is Boyles law?

A

As volume increases, pressure decreases

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10
Q

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

A

Cushion valves

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11
Q

Check valves allow what?

A

Flow in only one direction

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12
Q

In a multistage compressor which piston is larger?

A

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

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13
Q

What is the benefit of having a multistage compressor?

A

Builds more pressure.

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14
Q

Pressure is measured in what?

A

PSI

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15
Q

Flow rate in pneumatics is measured In what?

A

CFM

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16
Q

You control pressure at what 2 points?

A

At the compressor and after the receiver tank

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17
Q

What are the 3 types of center conditions?

A
  1. Blocked
  2. Exhaust
  3. Pressure
18
Q

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

A
  1. Fixed
  2. Adjustable
19
Q

Give an example of fixed and adjustable flow controls.

A

Fixed - orfice plate
Adjustable - needle valve

20
Q

This valve increases exhaust flow in a dcv?

A

Quick exhaust valve

21
Q

Air is drawn into a fluid power motor by what?

A

The smallest volume chamber

22
Q

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

A

4 way dcv

23
Q

Formulas for pressure, force and area?

A

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

24
Q

What device cools between multistage compression?

A

Intercooler

25
Q

Which device cools after compression?

A

Aftercooler

26
Q

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

A

Unloading valve

27
Q

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

A

Bad check valve

28
Q

Most common non-positive displacement motor?

A

Centrifugal

29
Q

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

A

Speed

30
Q

Limiting pressure in a fluid power system means you limit?

A

Force

31
Q

3 things that a valve controls?

A
  1. System pressure
  2. Direction of flow
  3. Rate of flow
32
Q

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

A

Regulator

33
Q

Non-adjustable valve that only deals with upstream pressure?

A

Safety relief valve

34
Q

What do cushion valves protect against?

A

Shock and hammer

35
Q

What are 3 types of contamination?

A
  1. Built in
  2. Generated
  3. Ingested
36
Q

What does FRL stand for?

A

Filter, regulator, lubricator

37
Q

Why do we use lubrication?

A

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

38
Q

What are good work practices?

A

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

39
Q

What do you always have to have after an aftercooler?

A

Moisture separator

40
Q

How should you always meter flow to a cylinder?

A

When in doubt meter out

41
Q

Definition of a valve?

A

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

42
Q

Best place for a flow control?

A

At or close to the cylinder

Fluid Power (6 decks)

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