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Final > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

The measure of the density of a liquid is what

A

Specific gravity

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2
Q

Pressure is measured in

A

Pounds per square inch PSI

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3
Q

What is not needed to calculate the work a hydraulic cylinder can do

A

Power, you need pressure x piston area = force

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4
Q

Pascals law states that when pressure is exerted on a confined liquid the pressure is

A

Transmitted equally in all directions through the liquid

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5
Q

Bernoullis principle states that the total energy of the fluid always remains constant. Therefore when the fluid flow in a system increases the pressure must

A

Decrease

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6
Q

A hydraulic fluid must do all of the following except

A

Compress easily

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7
Q

Hydraulic fluid that exhibits little change in viscosity is said to have a high

A

Viscosity index

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8
Q

The ability of a fluid to penetrate into the small clearance between the closely fitted parts and remain there is based on its

A

Viscosity

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9
Q

The best method of controlling hydraulic fluid contamination is the use of

A

Good maintenance

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10
Q

What will limit the hydraulic fluid oxidation

A

Chemical inhibitor

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11
Q

The ability of a filter to remove 100% of the particles from a fluid is called its

A

Absolute rating

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12
Q

When the max allowable pressure drop of a filter is reached the filter will

A

Permit particles through the medium

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13
Q

Filters are used to pick up smaller contaminant particles because

A

They are able to accumulate them better than strainers

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14
Q

Depth filters load up quick and thus

A

Don’t have a long service life

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15
Q

Why are other surface filter media sintered or fused together used in high pressure systems

A

They are a thick mass of material which provides support to the filtering surface

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16
Q

The sudden slowdown in fluid movement causes many contaminants suspended in that fluid to

A

Separate and settle to the bottom of the tank

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17
Q

The baffle is used to help circulate returning fluid around the inside of the tank this also aids in what

A

Fluid cooling

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18
Q

In order to permit efficient cooling of the fluid reservoir the

A

Walls should be as thin as possible

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19
Q

What is used to vent the reservoir to the atmosphere

A

Air breather equipped with a 10 micofaret? Filter

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20
Q

Peak hydraulic system demands are met by the use of an

A

Accumulator

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21
Q

What causes hydraulic pressure

A

It’s caused by the load on the system and by the resistance of the hydraulic system to fluid flow

22
Q

Pump capacity is not rated in what term

A

PSI, they are typically rated in ,GPM

23
Q

The ratio of the actual delivery rate to the theoretical displacement is called

A

Volumetric efficiency

24
Q

What are the four major gear pump classifications

A

External, internal, axial flow or screw, and cycloidal

25
Q

Internal gear pumps are used in hydraulic systems limited to operating pressures below

A

1000 PSI

26
Q

Another type of pump commonly used in hydraulic systems is the

A

Vane pump

27
Q

Flow rate through a pipe is measured in

A

GPM

28
Q

Pressure lost in a hydraulic line depends on the

A

Flow velocity through the line

29
Q

Hydraulic lines should never be constructed of

A

Galvanized pipe, it could flake

30
Q

The safe working pressures of hydraulic piping are based on providing a safety factor of

A

6

31
Q

One disadvantage of using flexible hose in a hydraulic system is

A

They are less permanent then piping or tube

32
Q

What is used to change the direction of motion of hydraulic cylinders

A

Direction control valves

33
Q

Directional control valves are classified in several different ways

A

One is the number of paths three or four

34
Q

Most solenoids are only strong enough to open against a spring with a

A

15 pound closing force

35
Q

What kind of valves are commonly used in hydraulic systems because of the construction they are partially balanced and easy to operate in a high pressure system

A

Spoil valves

36
Q

How many primary or working connections does a three way spool valve have

A

Three

37
Q

The three position four way valve is called

A

A closed crossover valve

38
Q

A pressure relief valve is rated by its

A

Flow capacity and operating differential pressure

39
Q

The flow from the outlet of a sequence valve is at blank pressure

A

Line

40
Q

To limit the pressure to below the main part of the system you must use a

A

Pressure reducing valve

41
Q

A shock suppressor is used in a hydraulic system as

A

Protection against pressure surges

42
Q

Flow control valves used in a hydraulic system are usually positioned to

A

Meter out, regulates fluid flow on the outlet side of the actuator

43
Q

A cylinder in which the retracting stroke becomes the power stroke is called what type of cylinder

A

Pull type cylinder

44
Q

When a hydraulic cylinder is added to an existing system be sure that

A

The pump capacity is adequate

45
Q

What is the purpose of the cushioning device used with a hydraulic cylinder

A

Prevent mechanical shock

46
Q

All hydraulic pumps are

A

Positive displacement

47
Q

Motor pressure ratings vary from

A

100-5000 PSI

48
Q

The overall efficiency of a hydraulic motor is calculated how

A

Output hp divided by input hp

49
Q

A crescent shaped separator is used on some blank gear motors

A

Internal gear motor

50
Q

Gear motors are frequently equipped with wear plates to prevent

A

Internal leakage

Final (12 decks)

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