Final 2

Question 1

What type pump is centrifugal?

Answer 1

Non-positive displacement

Question 2

What are the two types of positive displacement pumps?

Answer 2

Rotary
Reciprocating

Question 3

What are the two ways to control system pressure in a hydraulic system?

Answer 3

Relief valve- divert back to tank
Pressure compensator

Question 4

What moves fluid in a pump?

Answer 4

Difference in volume in chambers

Question 5

What four things does hydraulic fluid do?

Answer 5

1. Transmit power
2. Lubricate
3. Cool moving parts
4. Seal clearances

Question 6

What is pump cavitation?

Answer 6

Formation and collapse of air bubbles.

Question 7

What is pseudo cavitation?

Answer 7

Extra air being drawn into system.

Question 8

What can cause pseudo cavitation?

Answer 8

Bad seals
Crack on inlet side
Low fluid level

Question 9

What is the first Line of defense for a hydraulic system?

Answer 9

Sump strainer

Question 10

Should return line be larger or smaller than pressure line?

Answer 10

Larger, to allow for lower pressure and less turbulence in tank

Question 11

Four ways to operate dcv

Answer 11

1. Manually
2. Mechanically
3. Solenoid
4. Pilot operated

Question 12

4 types of centers on dcv’s

Answer 12

Float
Block
Tandem
Open

Question 13

Uses for accumulator

Answer 13

Develop flow
Backup pressure
Shock absorption
Maintain system pressure