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2nd 6 Month Final > Hydraulics TPC > Flashcards

Hydraulics TPC Flashcards

1
Q

What characteristic of a fluid does the term specific gravity describe?

A

Density

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2
Q

Pressure is measured in ________ in the English system

A

PSI

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3
Q

Which of the following is not needed in order to calculate the work a hydraulic cylinder can do?

A

Power (ft-lb/min)

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4
Q

Pascal’s laws states that pressure exerted on a confined liquid:

A

Is distributed equally throughout the liquid

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5
Q

According to Bournooli’s principle, when fluid flow increases in a system, the pressure:

A

Decreases

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6
Q

A hydraulic fluid must be able to do all of the following except:

A

Compress easily

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7
Q

A hydraulic fluid that exhibits little change in viscosity when heated is said to have a high:

A

Viscosity index

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8
Q

The ability of a fluid to penetrate into small clearances between closely fitted parts is determined by the fluid’s

A

Viscosity

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9
Q

Which of the following, when added to hydraulic fluid, will limit oxidation?

A

A chemical inhibitor

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10
Q

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

A

Good maintenance procedure

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11
Q

The ability of a filter or strainer to remove 100% of the contaminant particles of a particular size from a hydraulic fluid is called:

A

Absolute rating

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12
Q

When the maximum allowable pressure drop of a filter is reached, the filter will:

A

Allow particles to pass through the medium

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13
Q

The purpose of the filter in a hydraulic system is to:

A

Remove small contaminants

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14
Q

The purpose of the filter in a hydraulic system is to:

A

Remove small contaminants

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15
Q

Depth filters do not:

A

Have a long service life

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16
Q

Surface filter media made of sintered metal powders are use in high-pressure systems because of their:

A

Thick mass

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17
Q

The separation of contaminants from hydraulic fluid in a resovoir is aided by

A

Slow fluid movement

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18
Q

What is used in a hydraulic reservoir to aid fluid cooling?

A

A baffle

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19
Q

To maintain the temperature of a hydraulic fluid effectively, the reservoir should have:

A

Thin walls

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20
Q

An air breather is installed on a fluid reservoir to:

A

Vent the reservoir

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21
Q

Peak hydraulic system demands are usually met by the use of an:

A

Accumulator

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22
Q

The resistance of a hydraulic system to fluid flow causes:

A

Pressure

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23
Q

Pump capacity is rated in all of the following terms except:

A

Pounds PSI

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24
Q

The ratio fo the actual delivery rate of the pump to its displacement is its:

A

Volumetric efficiency

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25
Q

Which of the following is not a type of gear pump?

A

Vane

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26
Q

Internal gear pumps are normally used in applications that have:

A

Pressures of less than 1000psi

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27
Q

The flow rate of hydraulic fluid through piping or tubing is measured in

A

GPM

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28
Q

Pressure loss in a hydraulic line depends on the

A

Flow velocity

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29
Q

Hydraulic lines should NEVER be constructed of

A

Galvanized pipe

30
Q

In non critical applications having no severe stress, safe working pressures of hydraulic piping are bases of providing a safety factor of:

A

6

31
Q

A disadvantage of using hose in hydraulic systems instead of piping or tubing is that the hose:

A

Is less permanent

32
Q

Which of the following kinds of valves should be used in hydraulic system to change the directions of motion of the cylinder?

A

Directional control valve

33
Q

A three way valve is identified by its three…

A

Paths

34
Q

The closing force of a direct acting solenoid valve is approximately

A

15lbs

35
Q

The construction of a spool valve causes it to:

A

Be partially balanced

36
Q

A four way valve that can operate in three positions is called a

A

Closed crossover valve

37
Q

The operating differential pressure of a relief valve is the difference between its maximum pressure and the

A

Cracking pressure

38
Q

The flow from the outlet of a sequence valve is at

A

Line pressure

39
Q

Fluid pressure in one section of a hydraulic system is limited by a

A

Reducing valve

40
Q

A shock suppressor is used in a hydraulic system as

A

Protection against pressure surges

41
Q

A meter-out flow-control valve is used to regulate fluid flow from a(n)

A

Actuator

42
Q

Straight line mechanical force is created by

A

Hydraulic cylinder

43
Q

The force exerted by a double acting piston is

A

Less on the rod side

44
Q

A cylinder in which the retracting stroke is the power stroke is called a

A

Pull-type cylinder

45
Q

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

A

Pump capacity is adequate

46
Q

Mechanical shock is controlled in a Hydraulic cylinder by means of

A

Cushioning device

47
Q

Which of the following statements about hydraulic motors is true?

A

They are all positive displacement types

48
Q

The pressure range of a hydraulic motor may vary from

A

100 to 5000 psi

49
Q

the overall efficiency of a hydraulic motor is defined as the

A

Output horsepower divided by the input horsepower

50
Q

A crescent shaped separator is used on some _________ gear motors

A

Internal

51
Q

Internal leakage in hydraulic gear motor is held to a minimum by the use of

A

Wear plates

52
Q

The amount of matter in an object and its resistance to change in motion is called its
- density
- mass
- volume
- weight

A

Mass

53
Q

The Law of Conservation of Energy states that energy cannot be created or destroyed, it can only be
- amplified
-conserved
- diluted
- transformed

A

Transformed

54
Q

Turbulent flow conditions:
- can release air suspended in the hydraulic fluid
- conserve power
- cool the hydraulic fluid
- occur when fluid viscosity is too high

A

Can release air suspended in the hydraulic fluid

55
Q

A fluid rated at 250 SSU has a ____________ than a fluid rated at 150 SSU
- higher flow rate
- higher viscosity
- lower film strength
- lower pour point temperature

A

Higher viscosity

56
Q

The viscosity of a fluid is a measure of its resistance to

A

Flow

57
Q

How should cylinders used for heavy-duty pushing or thrust applications be mounted?

A

Square flanges on the cap end

58
Q

Which type of motor toque changes with changes in fluid pressure?

A

Runnning

59
Q

A counter-balance valve is normally a _________ valve

A

Double-poppet

60
Q

The two categories of relief valve are _______ and ________.

A

Direct acting, and pilot operated

61
Q

The pressure at which a check valve starts to open is called its ______ pressure

A

Cracking

62
Q

In applications using a needle valve that must be shut off frequently, a ________ should be used

A

Soft seat

63
Q

Directional valves are sometimes classified by the way the fluid flows when the valve is in the ________ position.

A

Center

64
Q

Which of the following connections are suitable for joining 1 1/2” pipe?

A

Threaded

65
Q

The most important factor is selecting hydraulic line is the

A

Flow rate

66
Q

Pressure loss in a hydraulic line depends on the

A

Flow velocity

67
Q

A vane pump with the rotor place off-center is classified as a(n) _________ pump

A

Unbalanced

68
Q

Pumps operating at high pressures require a minimum speed to prevent

A

Overheating

69
Q

In addition to storing and releasing fluid, accumulators also

A

Absorb hydraulic shocks

70
Q

In what part of the hydraulic reservoir tank does the sludge settle?

A

Sump

71
Q

What is the reason for installing duplex in-line strainers in a hydraulic system?

A

Clean one while the other is operating

2nd 6 Month Final (11 decks)

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