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PNA1 Flashcards

1
Q

Cavitation can be the result of

Hydraulic fluid with low viscosity
Running pump at too high speeds
Increasing inlet flow
Removing inlet stainer

A

Running pump at too high of speed

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2
Q

An example of a dynamic pump would be

Impeller
Vane
Gear
Piston

A

Impeller

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3
Q

A spring that extends by force and retracts by spring or Gravity is known as

A

Single acting

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4
Q

The flow produced by a pressure compensated pump during cylinder extension is at

Load pressure
Relief pressure
Stand by plus load pressure
Stand by pressure

A

Load pressure

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5
Q

The flow produced by a pressure compensated pump at the end of its stroke is at

Stand by pressure
Load pressure
Relief pressure
No flow produced

A

Relief pressure

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6
Q

The purpose of a cycling cushion is to

A

Reduce amount of shock

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7
Q

The pump in a hydraulic system produces

A

Fluid flow

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8
Q

An unbalanced vane pump can be identified by its

A

Off Center cam ring

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9
Q

Variable displacement vane pumps control fluid flow by

A

Shifting the cam ring

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10
Q

The vanes of the vane pump maintain contact with the cam ring by

A

Sets of inlet outlet ports opposing each other

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11
Q

A pumps input is 15gpm and measured output is 12gpm at 1000 psi. The volumetric efficiency is?

A

80%

12 div by 15 x 100

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12
Q

The displacement of a bent axis piston can be varied by

A

Pivoting the cylinder block to change the angle of the shaft

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13
Q

The toque of a hydraulic motor is dependent upon

A

Inlet pressure, surface area, and radius of rotation

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14
Q

If a cylinder had internal leakage it would effect

A

Pressure

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15
Q

Hydraulic motors are driven by

A

Fluid flow and pressure

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16
Q

Balance vane motors maintain vane contact by

A

Fluid pressure/springs

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17
Q

In an inline axial piston motor, speed can be increased by

A

Decreasing swash plate angle

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18
Q

The purpose of the stop tube is to

A

Reduce side load when extended

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19
Q

In a rotary piston pump, the fluid is ported in and out of the cylinder through the

A

Pintle

20
Q

The output flow of gear pumps can be adjusted by

A

Changing rpm or a prime mover

21
Q

A radial piston motor can be classed as

A

Low speed/high torque

22
Q

O-ring boss port connections have what type of threads

A

Unified national fine

23
Q

Three main styles of pumps

A

Piston
Vane
Gear

24
Q

What is require at the pumps In order for oil to flow into the inlet

A

Negative pressure

25
Q

What cylinder style is the most common in hydraulics

A

Double acting cylinder

26
Q

What type of cylinder has two Pistons attached to a rod to obtain extra force

A

Tandem

Used for high force, short stroke

27
Q

What part of a cylinder contains the load pressure

A

Barrel

28
Q

When the main port connections are at the bottom how do you remove entrapped pressure

A

Bleed port

29
Q

a symptom of a hot spot would indicate what in a cylinder

A

Internal leaks

30
Q

Jerky movement, squealing or rattling sound is a sign of what in a cylinder

A

Aeration

Or

Misalignment

31
Q

Hydraulic motors convert what type of power into rotary motion and produce toque to drive

A

Fluid power

32
Q

Smooth operation and heavy loads and low speeds of 2rpm describe what type of hydraulic motor

A

LSHT low speed high torque

33
Q

Crane hoist, dynamic rollers slow turning vaccume screens all require what type of hydraulic motor

A

LSHT

34
Q

Three types of LSHT motors

A

Radial piston
Cam type
roller vane

35
Q

Fans generators and compressor all require what type of hydraulic motor

A

HSLT

36
Q

What motor cymbal has a half circle with two arrows pointing up

A

Limited rotation motor

37
Q

Torque depends on what three 3 key elements

A

Inlet pressure, surface area, radius of rotation

38
Q

Motor speed depends on what two factors

A

Flow rate

Volume

39
Q

What is the advantage of the roller vane Gerotor design

A

It reduces the friction between gears by using rollers in place of internal gear teeth.

40
Q

What do the orbiting gear rotor and roller vane Gerotor have in common

A

Orbiting star shaped gear

41
Q

All 4 piston motors operate under the same principle which is…

A

Pressurized inlet fluid pushes on the piston to produce rotation through either swash plate or a cam

42
Q

What valve is spring loaded and opens when the filter clogs is hydraulic motors

A

Spring load check valve

43
Q

A pressure drop of over 45psi is hard on filter elements and wastes power. A pressure drop of 85 psi at 20gpm consumes about how much HP

A

1HP

44
Q

Bypass Indicator colour

Green =

Yellow =

Red =

A

Green - Full flow is passing through filter

Yellow - bypass valve is beginning to open (yellow is a good indication for filter change)

red - Filter is clogged

45
Q

What filter has 20% of the total system preset pass through it every minute

A

Return line filter

46
Q

What filters are used imidatly after the pump

A

Pressure line filters

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