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my stuff > PNA2 > Flashcards

PNA2 Flashcards

1
Q

Why is an orb fitting preferable to as a tapper thread fitting

A

It causes less stress and distortion

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2
Q

Should you normally instal a cylinder with the ports at the top or the bottom

Why

A

Top

Allows for bleeding out after installation

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3
Q

Why is it important to align a cylinder to the load to which it is attached

A

To avoid wear on walls and on seals

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4
Q

What is the most costly result of leaks in a cylinder

A

Dirt and air

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5
Q

What is the operating principle of any hydraulic motor

A

Fluid pushes to turn the drive shaft

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6
Q

What does a decrease in mechanical in mechanical efficiency indicate

A

Increase in internal friction

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7
Q

What does a decrease in volumetric efficinecy indicate

A

Internal leakage

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8
Q

What type of gear motor requires timing

A

Orbiting gear

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9
Q

What is found in a vane motor that is not in a vane pump

A

Springs under the vanes

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10
Q

How can you change the displacement of a cam type radial piston motor

A

Change cam ring to a different size

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11
Q

By shutting off the cushion valve at the rod end of a cylinder with a load pulling what danger could occurs

A

Pressure intensification

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12
Q

What happends if you dont time a radial piston motor correctly

A

It runs in revers

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13
Q

Do pumps create pressure or flow?

A

Flow

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14
Q

Why are positive displacement pumps used for hydraulics

A

More acurate flow control

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15
Q

Does the volume of the pumping chamber expand or contract at the inlet

A

Expand at inlet

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16
Q

Three methods of changing the output of a pump

A

Built in flow controls
drive speed change
Variable displacement

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17
Q

Wish swash plate control, regulates the flow to suit any given load

Limits the maximum pressure in the system

A

Load sensing compensator

Pressure limiting compensator

18
Q

When you install a load sensing pump what must the load sensor be set at to bring the bias piston back to full stroke

A

200-400 psi

19
Q

Does the space between the vanes increase or decrease at the inlet

A

Increase

20
Q

How is output flow increased on an unbalanced vane pump

A

By moving the cam further off Center

21
Q

What is the rotation of a factory built vane pump

A

Right hand

22
Q

On a gear pump do gears go into or come out of mesh at inlet

A

Come out of mesh

23
Q

Fro what end of the pump is the rotation defined

A

Drive end

24
Q

How do you change the direction of rotation in a balanced vane pump

A

Flip over cam ring, rotor and flex plate assembly

25
Q

What pump is more compact balance or Unbalanced vane

A

Balance vane

26
Q

Pumping chambers increase or decrease in volume at inlet and then increase or decrease as they push out fluid at discharge

A

Increase volume at inlet, decrease at discharge

27
Q

How is fluid ported in and out of a radial piston pump

A

Through check valves in the Pistons

28
Q

What’s more efficient gear pump or piston pump

A

Piston pump

29
Q

Does an internal gear pump have the same number of teeth as the outside or should it have fewer

A

Fewer

30
Q

Why is a very close fit necessary between the teeth the casing on a gear pump.

A

To prevent bypassing back to inlet

31
Q

Which is the best pump to use if you have to locate it above the surface of the fluid: an in-line axial pump or a bent axis

A

Bent axis

32
Q

What is the purpose of a bias piston in a in line axis piston pump

A

To move the swash play to the maximum angle

33
Q

What provides more force to keep the vane in a vane pump against the cam ring

A

intra-vane

Cartage style -= high efficiency, high pressure

34
Q

Positive seals and non positive seals differ how

A

Positive seals are designed for zero leakage

Non positive seals allow controlled leakage

35
Q

How do static and dynamic seals differ

A

Static is for stationary parts

Dynamic Is for moving parts

36
Q

What 2 seal types are used to deal against the case pressure in a hydraulic pump or motor

A

High pressure lip seals or mechanical seals

37
Q

What seals are used for pressures over 150 psi

A

Mechanical seals

38
Q

What are 3 accumulator applications

A

Compensate for lag
Emergency power
Makeup fluid for leakage

39
Q

Four types of piston motors

A

Inline axial piston
Bent piston
Radial piston
Cam type radial piston

40
Q

Maximum angle in an inline axial motor has what speed and what torque

A

Low speed

High toque

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