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Hydraulics > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Which pump can be variable displacement?

A

Piston

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2
Q

Which cylinder component prevents slamming against the cap or rod end?

A

Cushion

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3
Q

What two types of pressure systems do we use?

A

Psia (atmosphere) and psig (gauge)

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4
Q

What does a counterbalance valve do?

A

Keeps a cylinder from dropping a heavy load

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5
Q

What type of seals do cylinder pistons have?

A

Single bidirectional sealing element

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6
Q

Which component is designed to store hydraulic fluid at system pressure and release it when demand exceeds pump delivery?

A

Accumulator

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7
Q

Which type of hydraulic pump uses an angled swash plate?

A

Axial piston

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8
Q

A flow path through a normally closed pressure relief valve is opened when fluid pressure is enough to overcome spring pressure. True or False?

A

True

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9
Q

What are the functions of hydraulic fluid?

A

Transfer of power, lubrication

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10
Q

At sea level, a column of air 1 inch tall will weigh?

A

14.7 pounds

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11
Q

Accumulators are filled with inert gas such as nitrogen, can air be used instead?

A

No

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12
Q

Generation of heat by working energy being delivered to components is considered…

A

System Inefficiency

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13
Q

The major cause of entrainment is leakage past cylinder seals. True or False?

A

False

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14
Q

What component dissipates heat, settles contaminants?

A

Reservoir

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15
Q

Manmade oil is called

A

Synthetic

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16
Q

With air-over-oil accumulators, a pinhole size leak can cause the oil spray to become

A

Combustible

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17
Q

High temperature oxidation causes

A

Lacquer, varnish, sludge

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18
Q

A hydraulic actuator converts…

A

hydraulic energy to mechanical energy

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19
Q

A volume that flows in a given amount of time is called

A

Flow rate

20
Q

SUS stands for

A

Saybolt Universal Seconds

21
Q

How does a flow control valve work?

A

Operates by resistance

22
Q

ASTM stands for

A

American Society for Testing Materials

23
Q

A resistance of a fluid to flow

A

Viscosity

24
Q

A common fluid used for hydraulic fluid is either…

A

Paraffinic or naphthenic

25
Q

According to the law of conservation of energy,

A

Energy can neither be created nor destroyed, but it can change forms

26
Q

Application of a force through a distance

A

Work

27
Q

Reduction of friction between moving objects

A

Lubrication

28
Q

One consideration when dealing with energy is…

A

The STATE in which it is found

29
Q

Define resistance

A

Any force which can stop or slow the movement of a body

30
Q

2 types of actuators

A

Rotary or linear

31
Q

A pressure compensated flow control valve delivers a constant flow regardless of fluctuations before and after the valve. True or false?

A

True

32
Q

Vane pumps containing a pressure compensator produces a constant delivery. True or false?

A

True

33
Q

A sump strainer should be placed…

A

on the return side

34
Q

In most cases, flow control valves are installed after the directional control valve and before the actuator. True or false?

A

False

35
Q

How can dirt get into a hydraulic system?

A

Built-in, generated, added

36
Q

Most popular piston pump

A

Axial

37
Q

In the unbalanced design, fluid pressure on one side

A

Puts stress on the driveshaft and bearings

38
Q

Variable displacement pumps can vary output by…

A

Varying the position of the cam ring, adjusting the swash plate angle, or changing the size of the chambers

39
Q

The torque required to get a load turning?

A

Breakaway torque

40
Q

What can block fluid flow and starve a pump?

A

An oversized or improperly maintained sump strainer

41
Q

What type of flow control valve is designed to change pressure beyond the valve?

A

Pressure reducing, normally open

42
Q

What does a sequence valve do?

A

Causes one operation to occur before another by sensing upstream pressure, it is normally closed.

43
Q

Two major classifications of positive displacement pumps

A

Variable or fixed

44
Q

What Directional Control Valve should be used for a single acting cylinder?

A

2 position, 3 way

45
Q

Reservoir designs can be:

A

L-shape, overhead, conventional

46
Q

To start or stop a unidirectional hydraulic motor, what kind of directional control valve should be used?

A

2 position, 2 way

Hydraulics (1 decks)

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