Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Heavy Equipment Technician Period 3 Alberta > 190301b hydraulic pump fun > Flashcards

190301b hydraulic pump fun Flashcards

1
Q

Are vane pumps balanced or unbalanced?

A

Depending on Cam style they will be balanced or un balanaced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Hydraulic pumps convert what energies?

A

Mechanical energy to Hydraulic energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where does a pump gets its power from?

A

Prime mover (internal combustion engine or electric motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does a pump supply for our system?

A

Fluid flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What determines direction of rotation?

A

The mechanical energy source, the pump will be connected to it via a shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

On a gear pump how many drive gears are there?

A

one will be the drive from prime mover and the other will be driven

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Is pump displacement directly related to the pump’s internal volume?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do we express pump displacement?

A

cm³/rev or in³/rev

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Are gear pumps fixed displacement only?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Describe fixed displacement?

A

pumping chamber will deliver the same amount of fluid with every revolution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Is the input of a gear pump the low pressure side?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Are all vane pumps fixed displacement?

A

No they can also be variable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the three types of piston pumps?

A

Axial, Bent Axial and radial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What must be included to make a vane pump variable displacement?

A

Displacement control and maximum volume adjustment, adjust circular cam position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

In an axial piston pump, are the pistons parallel or 90° to the drive shaft?

A

Pistons are parallel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Are radial piston pump’s pistons parallel or 90° to the drive shaft?

A

90°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What does maximum swash plate angle create in a piston pump?

A

The result is maximum flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Since a bent axis piston pump has no swash plate what needs to move to change displacement?

A

lens plate

rotating members

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What style of vans are needed to create a gradual start up?

A

Spring pressure on bottom of vane

20
Q

Generally what RPM does the vane pump need to rotate to use centrifugal force to push the vanes out?

A

600 RPM

21
Q

How many pieces of make up a vane pump house?

A

2 or 3 piece

22
Q

In a three piece vane pump house what is the middle piece?

A

The cam

23
Q

What are the two styles of cam rings in a vane pump?

A

Circular or elliptical

24
Q

What is used in a reversible gear pump to allow auto changes in flow direction?

A

Check balls

25
Q

What determines the amount of fluid flowing internally through a pump?

A

The pressure difference between inlet and outlet ports

The amount of internal clearance with the pump

26
Q

What limits the internal leakage in a external gear pump?

A

Pressure plates

27
Q

Rounded vane tips must be installed in the correct direction?

A

The direction of the rotor rotation does not change the way rounded vanes are installed

28
Q

What is generally the Volumetric efficiency of a external gear pump?

A

85-87% VE

29
Q

If you have a faulty shaft seal on a external gear pump, what would be the result?

A

Aeration

30
Q

What is the operator complaint if aeration is occurring?

A

Spongy operation

31
Q

Why do we need internal leakage in our pumps?

A

Lubricate all parts

32
Q

How do you determine the inlet port on an external gear pump?

A

Usually larger

Gears will be coming out of mesh

33
Q

Bi Directional Gear pumps can be installed what way?

A

In an application that is either clockwise or counter clockwise shaft rotation. (without performing any internal modifications)

34
Q

What is common on a bi direction gear pump?

Hint: Ports

A

Ports are generally the same size

35
Q

What is the vane style that has a small cut away in it that allows pressure to act on the underside of the vane?

A

Intra Vane Design

36
Q

What pressure is applied to the intra vane?

A

Outlet pressure

37
Q

What are the holes in the cam on a vane pump called?

A

Transfer Slot Input

38
Q

What is on the back side of a pressure plate to provide pressure?

A

Outlet oil pressure

Some have a spring to apply force during start up

39
Q

To change direction on a uni directional pump what is required?

A

Disassemble the pump and re position internal components

40
Q

true or false? The greater the pressure difference between the pump’s inlet and outlet port, the greater the amount of internal leakage?

A

True

41
Q

Define Slip

A

Oil leaking from the outlet side of a hydraulic pump to the inlet side

42
Q

What decreases when pump slip increases?

A

Efficiency decreases

43
Q

What can decrease volumetric efficiency?

A

too much pump wear, internal leakage increases

44
Q

How is overall efficiency determined?

A

Comparing input power to output power

45
Q

What is the pump style that can handle the most contamination?

A

External gear pumps

Heavy Equipment Technician Period 3 Alberta (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions