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Fluid power > Hydraulic Final #2 > Flashcards

Hydraulic Final #2 Flashcards

1
Q

Name a non-positive displacement pump?

A

Centrifugal

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2
Q

Formation and collapse of air bubbles

A

Cavitation

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3
Q

What are 2 common causes of cavitation?

A

1) Restriction on inlet side of pump
2) Oil is too viscous

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4
Q

T or F
True pump cavitation stops at the pump?

A

True

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5
Q

What is false cavitation?

A

Psuedo-cavitation

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6
Q

What is caused by too much vacuum on the inlet side of the pump?

A

Cavitation

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7
Q

What is caused by extra air being drawn into the inlet side of the pump?

A

Psuedo-cavitation

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8
Q

What are 2 reasons for psuedo-cavitation?

A

1) Crack on the inlet piping
2) Fluid level too low

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9
Q

Substance used for transmitting energy from pump to actuator in a working hydraulic system?

A

Hydraulic fluid

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10
Q

What 4 uses does hydraulic oil serve in a hydraulic system?

A

1) Transmits power
2) Lubricates parts
3) Cools moving parts
4) Seals clearances

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11
Q

T or F:
Hydraulic oil is fire proof?

A

False

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12
Q

When is hydraulic oil most dangerous?

A

When it’s atomized

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13
Q

What are the 4 hydraulic additives?

A

1) Anti-wear
2) Wear resistant
3) Extreme pressure
4) Rust and oxidation inhibitor

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14
Q

Coverts working energy into rotary mechanical energy?

A

Hydraulic motor

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15
Q

Name 3 types of hydraulic motors?

A

1) Vane
2) Gear
3) Piston

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16
Q

What are the 5 ways to identify a DCV?

A

1) Positions
2) Ways
3) Operated
4) Return or held
5) Center conditions

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17
Q

How many positions can a DCV have?

A

2 or 3

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18
Q

What is the minimum number of ways a DCV can have?

A

2

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19
Q

What are the 4 ways a DCV can be operated?

A

1) Manual
2) Electrical
3) Pilot
4) Mechanical

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20
Q

What are the 4 DCV centering conditions?

A

1) Float
2) Blocked
3) Open
4) Tandem

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21
Q

Name 4 valve sizes by ports from smallest to largest?

A

1) D03
2) D05
3) D08
4) D010

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22
Q

Allows flow in one direction only?

A

Check valve

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23
Q

Name 3 applications a check valve can be used for?

A

1) By-pass check
2) Isolation/ back flow check
3) Pilot operated check

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24
Q

Name the 3 types of accumulators:

A

1) Weight loaded
2) Spring loaded
3) Hydro-pnuematic

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25
Q

Which accumulator type is charged with nitrogen?

A

Hydro-pnuematic

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26
Q

Name 3 uses of an accumulator:

A

1) Develop flow
2) Maintain pressure
3) Absorb shock

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27
Q

Name the 3 types of reservoirs:

A

1) Conventional
2) Overhead
3) L-shaped

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28
Q

What creates a quiet zone inside the reservoir?

A

Baffle plate

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29
Q

Name 3 purposes a baffle plate serve inside a reservoir:

A

1) Allows fluid to cool
2) Settle dirt
3) Allows trapped air to escape

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30
Q

Name 2 types of fluid coolers:

A

1) Air cooled
2) Water cooled

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31
Q

What are the 2 types of flow controls:

A

1) Fixed
2) Adjustable

32
Q

What are 4 locations of hydraulic filters:

A

1) Sump strainer
2) Suction filter
3) Pressure filter
4) Return filter

33
Q

What are the 4 hydraulic cylinder types:

A

1) Single acting
2) Double acting
3) Single rod
4) Double rod

34
Q

What slows the rod speed at the end of its stroke?

A

Cushion valve

35
Q

What helps eliminate shock in a hydraulic cylinder?

A

Cushion valve

36
Q

Name 4 pressure control valves:

A

1) Relief valve
2) Sequence valve
3) Pressure reducing valve
4) Counterbalance valve

37
Q

What 3 pressure control valves are normally non-passing?

A

1) Relief valve
2) Sequence valve
3) Counterbalance valve

38
Q

Which pressure control valve normally has a built in bypass check?

A

Counterbalance valve

39
Q

Which pressure control valve is normally passing?

A

Pressure reducing valve

40
Q

What must be added in parallel with a sequence valve to allow reversible motion?

A

By-pass check

41
Q

Name the 2 styles of positive displacement pumps:

A

1) Reciprocating
2) Rotary

42
Q

T or F:
Pumps create pressure?

A

False

43
Q

What is pressure?

A

Force per unit area

44
Q

Which pressure control valve limits system pressure?

A

Relief valve

45
Q

Which pressure control valve allows one operation to happen before another operation?

A

Sequence valve

46
Q

Which pressure control valve reduces downstream pressure after a valve?

A

Pressure reducing valve

47
Q

Which pressure control valve counteracts a heavy weight on an actuator?

A

Counterbalance valve

48
Q

What creates pressure?

A

Resistance to flow

49
Q

What 3 things dictate the capacity of a pump?

A

1) Size of pump
2) Viscosity
3) RPM

50
Q

Bearing for a split case pump is referred to as what?

A

In-between bearing

51
Q

Bearing in an end suction pump is called what?

A

Overhung bearing

52
Q

Rather than using a DCV, what is used to hold heavy loads in the air?

A

Pilot operated check valve

53
Q

T or F:
A safety relief valve is the only thing that limits system pressure when using a fixed displacement pump?

A

True

54
Q

What are the 2 types of packing in a pump:

A

1) Mechanical
2) Compression packing

55
Q

Which type of displacement controls pressure at the pump?

A

Variable

56
Q

Name the 3 types of impellers used in pumps:

A

1) Open
2) Semi-open
3) Closed

57
Q

List the 7 steps to setting the compensator on a pump:

A

1) Block flow
2) Back relief valve all the way out
3) Run compensator all the way in
4) Set relief valve pressure
5) Set system pressure
6) Lock jam nuts
7) Open flow

58
Q

What is the separation of oil from water?

A

Phase separation

59
Q

What is excessive flow over the case drain an indication of?

A

A failing pump

60
Q

How is pressure measured?

A

PSI

61
Q

How is flow in a hydraulic system measured?

A

GPM

62
Q

Name 2 different types of hydraulic fluid:

A

1) Water based
2) Synthetic

63
Q

Which pressure control valve has an external bleed line back to tank?

A

Sequence valve

64
Q

Which 2 pressure control valves have the pilot before the valve:

A

1) Relief valve
2) Sequence valve

65
Q

Which pressure control valve has an external pilot pressure that monitors the flow rate leaving the cylinder body?

A

Counterbalance valve

66
Q

Is a 2 position DCV spring centered or spring returned?

A

Spring returned

67
Q

Is a 3 position DCV spring centered or spring returned?

A

Spring centered

68
Q

Which displacement pump has a case drain to help monitor pump life?

A

Variable displacement

69
Q

Name 2 types of centrifugal pumps:

A

1) Split case
2) End suction

70
Q

Which hydraulic filter is located inside the reservoir and can be hard to get to?

A

Sump strainer

71
Q

Which hydraulic filter is located just before the pump inlet?

A

Suction filter

72
Q

Which hydraulic filter is located after the pump but before the return?

A

Pressure filter

73
Q

Which hydraulic filter is located just before the reservoir in the return system?

A

Return filter

74
Q

What is the most common flow control?

A

Needle valve

75
Q

Which of the 4 ways to operate a DCV has the ability to move the biggest spool type?

A

Pilot operated

Fluid power (12 decks)

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