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Secunduh > Basic Hydraulics TPC > Flashcards

Basic 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 [BLANK] in the English system

A

Pounds per square inch

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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 law states that pressure exerted on a confined liquid

A

is distributed equally throughout the liquid

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5
Q

According to Bernoulli’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 its

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 a filter in a hydraulic system is to

A

Remove small contaminants

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14
Q

Depth filter do NOT

A

have a long service life

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15
Q

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

A

Thick mass

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16
Q

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

A

slow fluid movement

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17
Q

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

A

A baffle

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18
Q

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

A

Thin walls

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19
Q

An air breather is installed on a fluid reservoir to

A

Vent the reservoir

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20
Q

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

A

Accumulator

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21
Q

The resistance of a hydraulic system to fluid flow causes

A

Pressure

22
Q

Pump capacity is rated in all the following terms EXCEPT

A

Pounds per square inch

23
Q

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

A

Volumetric efficiency

24
Q

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

A

Vane

25
Q

Internal gear pumps normally are used in applications that have

A

Pressures of less than 1000 psi

26
Q

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

A

gpm

27
Q

Pressure loss in a hydraulic line depends on the

A

Flow velocity

28
Q

Hydraulic lines should NEVER be constructed of

A

Galvanized pipe

29
Q

In noncritical applications having no severe stress, safe working pressures of hydraulic piping are based on providing a safety factor of

A

6

30
Q

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

A

Is less permanent

31
Q

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

A

Directional control valve

32
Q

A three-way valve is identified any its three

A

Paths

33
Q

The closing force of a direct-acting solenoid valve is approximately

A

15 lbs

34
Q

The construction of a spool valve causes it to

A

Be partially balanced

35
Q

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

A

Closed crossover valve

36
Q

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

A

Cracking pressure

37
Q

The flow from the outlet of a sequence valve is at

A

Line pressure

38
Q

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

A

Reducing valve

39
Q

A shock suppressor is used in a hydraulic system as

A

Protection against pressure surges

40
Q

A meter-out flow-control valve is used to regulate fluid flow from an

A

Actuator

41
Q

Straight-line mechanical force is created by a

A

Hydraulic cylinder

42
Q

The force exerted by a double-acting piston is

A

Less on the rod side

43
Q

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

A

Pull-type cylinder

44
Q

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

A

Pump capacity is adequate

45
Q

Mechanical shock is controlled in a hydraulic cylinder by means of a

A

Cushioning device

46
Q

Which of the following statements about hydraulic motors is true?

A

They are all positive-displacement types

47
Q

The pressure range of a hydraulic motor may vary from

A

100 to 5000 psi

48
Q

The overall efficiency of a hydraulic motor is defined as the

A

Output horsepower divided by the input horsepower

49
Q

A crescent-shaped separator is used on some [BLANK] gear motors

A

Internal

50
Q

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

A

Wear plates

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