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Hydraulics > Final Exam Question Bank > Flashcards

Final Exam Question Bank Flashcards

1
Q

Lint from cleaning rags can be harmful to hydraulic systems because the lint ___.

A

…can clog filters and promote component leakage

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2
Q

If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be ___.

A

…obstructed suction passage

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3
Q

When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?

A

…there is no fluid flow

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4
Q

The hydraulic system of a deck winch has been drained, flushed, and refilled with hydraulic fluid. An erratic knocking noise from the hydraulic motor when the winch is started would indicate ___.

A

…air trapped in the system

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5
Q

The usual number of single-acting pistons used in a variable stroke axial-piston pump is ___.

A

…7 to 9

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6
Q

An axial piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned ___.

A

…parallel to each other and to the shaft

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7
Q

Which of the following problems may be encountered by using an oil having a viscosity higher than that specified for an operating hydraulic system?

A

…increased power consumption

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8
Q

A casing drain is provided for axial piston and bent axis variable stroke pumps to ___.

A

…prevent damage due to agitation and overheating of oil accumulated in the casing as a result of normal internal leakage

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9
Q

What is the prime mover?

A

…energy source that drives the pump

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10
Q

When installing a hydraulic hose, which of the following precautions should be taken?

A

…the hose should not be twisted
…the hose should be protected with a sleeve if it is subjected to rubbing
…there should be some slack in the hose
(all of the above)

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11
Q

What is the pressure at the bottom of a 20ft column of oil?

A

8 psi

0.4 psi per foot

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12
Q

Fatigue wear is defined as ___.

A

…particles bridging a clearance causing a surface stress riser or micro-crack that expands into a spall due to repeated stressing of the damaged area

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13
Q

After installing a hydraulic hose, which of the following precautions should be taken?

A

…the filters and strainers should be checked frequently

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14
Q

The speed of a radial piston hydraulic motor is controlled by…

A

…varying the fluid flow rate discharged to the motor

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15
Q

New piping and tubing to be installed in a hydraulic system can be safely degreased by using ___.

A

…a special petroleum solvent

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16
Q

The ability of an oil to separate cleanly from an oil and water mixture is referred to as its ___.

A

…demulsibility

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17
Q

Which of the following statements is/are true regarding hydraulic pumps in general?

A

…variable volumes can be obtained with gear pumps only by variation of the pump drive speed

18
Q

Tubing is sized by…

A

…nominal outside diameter

19
Q 
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?
Pressure-reducing valve
Unloading valve
Counterbalance valve
Pressure-relief valve
A

Pressure relief valve

20
Q

The pressure of an operating hydraulic system, as indicated by a pressure gauge is a result of the fluid flow overcoming:

  • internal resistance to flow
  • resistance of the internal components
  • the load applied to the system
A

all of the above

21
Q

What pressure is usually available to push liquid into the pump inlet?

A

atmospheric pressure

22
Q

Hydraulic pumps most commonly used in steering systems are of the…

A

…axial piston type

23
Q

With which component does the design of a hydraulic circuit begin?

A

…the actuator

24
Q

When changing to a fire resistant hydraulic fluid in a system, it is important to check the compatibility of the new fluid with the systems:
seals
metals and plating
paint

A

all of the above

25
Q

As a rule of thumb, when pressure is applied to hydraulic oil, the oil will…

A

…reduce in volume by 1/2 of 1% for every 1000 psi increment

26
Q

Which of the listed components of a hydraulic system would enable the pump to be temporarily shutdown, and yet still provide an instantaneous source of hydraulic force?

A

Accumulator

27
Q

Most solenoid valves are actuated by…

A

an electromagnet

28
Q

Sluggish response or action of the hydraulic actuators may be a result of…

A

…excessively high oil viscosity

29
Q

What does a directional control valve do?

A

Directs the flow of fluid

30
Q

A solenoid direct-acting three-position spring-centered directional control valve is used in a hydraulic system to control a linear actuator. When the remote push button is depressed to extend, the actuator fails to move even though the pump is on. What is going on?

A

Any one of the following:

  • a spring at one spool end has broken…
  • the ‘extend’ solenoid coil has developed and open circuit
  • the pump coupling is damaged and pump is unable to turn at its required speed
31
Q

Express 30 psia in psig

A

30 psia = 15.3 psig

32
Q

Air entrained in the hydraulic fluid, or trapped in an actuator will cause the actuators to move with a jerky motion. This action is a result of…

A

the trapped air being compressed to operating system pressure, the dropping…

33
Q

Air trapped in one end of a hydraulic actuator may be indicated by…

A

erratic or jerky motion of the actuator

34
Q

Before performing any maintenance on a hydraulic system storing energy in an accumulator, you should…

A

bleed off all pressure within the system

35
Q

Pump working pressure is the sum of which individual pressures?

A

Friction, fluid weight and load

36
Q

What determines the size of a pump needed in a hydraulic system?

A

How fast the actuators need to move

37
Q

How many envelopes are in the symbol for a relief valve?

A

One

38
Q

If the pump for a hydraulic anchor windlass is overheating, the cause may be…

A

excessive pump discharge pressure

39
Q

If you install a hydraulic hose on a unit and fail to leave sufficient room for expansion, which of the following problems will develop?

A

the hose may pull loose from its fittings

40
Q

When the pressure is applied to the Bourdon tube gauge show in illustration GS-0154…

A

…the gauge pointer will move in a clockwise direction

41
Q

The use of a needle valve in a piping system is recommended when requiring…

A

…close regulation of flow

Hydraulics (2 decks)

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