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86 > 8th 6 Months Final > Flashcards

8th 6 Months Final Flashcards

1
Q

To what type of energy does a hydraulic system convert electrical energy?

A

Usable

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2
Q

What is the function of a control valve in a hydraulic system?

A

All of the above

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3
Q

The hydraulic fluid in a system must be able to transmit power and

A

lubricate the system

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4
Q

Before working on a hydraulic system, the most important requirement is to

A

understand the system’s operation

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5
Q

If a hydraulic system is to function properly, it must

A

have all components installed correctly

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6
Q

Which of the following types of drawings illustrate the general location and appearance of a system’s elements?

A

Pictorial

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7
Q

What type of drawing illustrates the elements that make up a hydraulic system?

A

Schematic

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8
Q

On a schematic drawing, hydraulic components are represented by

A

symbols

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9
Q

The first thing to do when you read a schematic of a hydraulic system is to

A

obtain an overall view of the system

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10
Q

A schematic drawing of a hydraulic control valve illustrates fluid flow and

A

valve function

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11
Q

When installing hydraulic components, you should follow the installation techniques that

A

are required for each component

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12
Q

In order to provide proper alignments between a hydraulic pump and the driving motor, you should always

A

install the pump first

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13
Q

Which of these procedures should be followed when starting a newly installed pump?

A

Jog the drive motor

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14
Q

A stack of hydraulic control valves held together by bolts is called a

A

manifold

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15
Q

Which of the following statements about installing solenoid valves is NOT true?

A

Clip off the leads at the valve

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16
Q

Pump suction or inlet pipes should always be equal to or larger than the

A

pump intake

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17
Q

Which of the following must be considered when selecting hydraulic tubing?

A

All of the above

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18
Q

Which of the following should be avoided when assembling tubing?

A

Straight line connections

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19
Q

The disadvantage of using hydraulic hose in a hydraulic system is that it

A

wears out more quickly than tubing

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20
Q

Which of the following best describes most seals used in hydraulic components?

A

Preformed

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21
Q

What is the primary function of a hydraulic fluid?

A

Transmit force and energy

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22
Q

The lubricating capacity of a hydraulic fluid is dependent mostly upon its

A

viscosity

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23
Q

Which of the following items affects hydraulic fluid viscosity the most?

A

temperature

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24
Q

When you select a hydraulic fluid, always make sure it is

A

compatible with the system

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25
Q

Before filling a hydraulic system with hydraulic fluid, always make sure of the

A

system being clean

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26
Q

The interval of time between inspections on a specific hydraulic system depends on the

A

type of the system

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27
Q

Because inspections are made to locate trouble before a breakdown occurs, they are

A

preventive maintenance

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28
Q

After how many operating hours should the fluid in a hydraulic system be sent out for laboratory analysis?

A

1000

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29
Q

In many cases, repair maintenance can be scheduled for a later time. Under what conditions should this procedure NOT be followed?

A

When a safety hazard exists

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30
Q

When should hydraulic systems elements be reconditioned?

A

Periodically, and whenever they break down

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31
Q

Troubleshooting is best described as a means of determining trouble in a system by

A

means of a logical sequence

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32
Q

Prior to troubleshooting a hydraulic system, you should first evaluate the symptoms and then

A

determine the cause

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33
Q

The best way to protect a pressure gauge from surges is by

A

using a snubber with the gauge

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34
Q

When are fluid flow meters or gauges most commonly used in a hydraulic system?

A

During testing

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35
Q

Which of the following documents is the most helpful in solving a hydraulic system problem?

A

Maintenance record

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36
Q

The best way to determine if a valve is the cause of a system malfunction is to

A

test the circuit

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37
Q

Whenever a valve is disassembled for inspection or repair, you should always

A

replace the seals

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38
Q

Which of the following causes sludge formation?

A

Overheating of the hydraulic fluid

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39
Q

Which of the following could cause solenoid-coil burnout in a directional control valve?

A

All of the above

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40
Q

Which of the following tells how directional control valves should always be reassembled?

A

Carefully

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41
Q

Cylinder rod misalignment is usually caused by

A

side loading

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42
Q

A probable cause of an immovable or slow-moving cylinder may be

A

a blocked speed control valve

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43
Q

Which of the following hydraulic fluids is suitable for fire-resistant applications?

A

All of the above

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44
Q

Before connecting a cylinder to the hydraulic system, you should first

A

clean the piping system

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45
Q

Which of the following items is essential to proper cylinder performance?

A

Accurate mounting

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46
Q

Visual inspection of an operating hydraulic pump or motor is limited, because

A

You cannot see the internal parts

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47
Q

Broken pump rotors, fractured teeth or vanes, and repeated seal blowout are usually caused by

A

pressure shocks

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48
Q

Excessive wear and roughness in a gear pump are indications of

A

solid contaminants in the system

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49
Q

It is important to keep all contaminants out of piston pumps because of the pump’s

A

close-tolerance construction

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50
Q

It is good maintenance practice to replace which of the following when a hydraulic pump is repaired?

A

Anti-friction bearings, gaskets, and seals

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51
Q

What results when the volume of air in an air compressor is decreased?

A

Pressure increases

52
Q

A dynamic air compressor is frequently referred to as a

A

non-positive displacement compressor

53
Q

The size of a compressor air intake filter is determined by the

A

intake requirements

54
Q

Corrosion-resistance piping is used in pneumatic systems to

A

extend pipe service life

55
Q

After lubricating oil has been introduced into an air line, what is the recommended maximum distance that the air should travel?

A

30 ft

56
Q

What kind o f drawings should be used to show the interconnections between components

A

Pictorial

57
Q

What is generally illustrated in a schematic drawing?

A

Functions and operations

58
Q

Pilot or signal lines are shown on a schematic drawing as

A

a series of long dashes

59
Q

A schematic diagram can best be understood if the drawing is

A

studied in small segments

60
Q

Special schematic symbols are usually devised and drawn by the

A

component manufacturer

61
Q

In accordance with the American Society of Manufacturing Engineers’ code, air receivers must be equipped with safety valves and

A

pressure gauges

62
Q

Slightly over-sized pipe

A

can help accommodate additional demands

63
Q

What is the proper spacing for pipe supports or hangers?

A

Close enough to prevent sag

64
Q

What should you do if an air leak occurs at a flared fitting?

A

Replace the flare

65
Q

What is the proper length for hoses used to connect pneumatic components?

A

Only as long as necessary

66
Q

A good planned maintenance program requires

A

regular equipment checks

67
Q

A pneumatic system operated with excessive air pressure will usually have

A

accelerated wear

68
Q

Most control valves in a pneumatic system are designed for use with pressure up to

A

150 psi

69
Q

The best time to perform a daily check on compressor room equipment is

A

early in the shift

70
Q

The operating cycles of control valves and cylinders used on production lines are usually entered in the

A

production record

71
Q

Which of the following determines what troubleshooting checks to make in a pneumatic system?

A

The type and number of components

72
Q

When you are troubleshooting a pneumatic system, first check the

A

supply air pressure

73
Q

Which of the following would NOT be in the description section of an operations manual?

A

Troubleshooting procedures

74
Q

Piston seals can be checked for leakage by

A

observing the exhaust port for air

75
Q

Which of the following should you always inspect when troubleshooting a manually operated control valve for sluggish action?

A

Moving parts

76
Q

Heat generated in the cylinder of a compressor during the compression stroke is best controlled by cooling the compressor and

A

limiting the compression pressure

77
Q

An air compressor operating in a dusty or oily atmosphere should be cleaned at regular intervals with a

A

detergent

78
Q

Which of the following causes the greatest discharge valve wear in a compressor?

A

Carbon deposits

79
Q

A motor starting controller on a compressor is checked for proper operation by starting the compressor after the

A

reservoir pressure has been relieved

80
Q

Which of the following is NOT a maintenance consideration common to all rotary compressors?

A

Intake valves

81
Q

The best way of locating air control valve problems is to analyze the performance of the

A

circuit components

82
Q

`Loss of power in a pneumatic control circuit can cause the circuit to

A

get out of sequence

83
Q

What is used to activate a solenoid on a pneumatic control valve?

A

An electric current

84
Q

A control valve that will shift manually, but not automatically, is likely to have

A

low air pressure

85
Q

The use of an improper lubricant in a control valve may result in all of the following EXCEPT

A

shifting without a signal

86
Q

What type of pneumatic cylinder is used for most industrial applications?

A

tie rod

87
Q

The primary purpose of a piston rod bushing is to

A

act as a bearing

88
Q

Above what temperature do pneumatic cylinders require special seals?

A

200 F

89
Q

Improperly tightened or torqued tie rods on pneumatic cylinders will cause

A

internal misaligntment

90
Q

What is the function of pneumatic cylinder cushions?

A

Prevent cylinder damage

91
Q

The normal service life of air motors can be improved by

A

clean, filtered air

92
Q

Which of the following is a proper lubricant to use when installing hose couplings?

A

Soapy solution

93
Q

Air motors require careful handling during disassembly and assembly because they are

A

precision-built

94
Q

Special attention should be given to the ____ of pneumatic grinders.

A

arbor shafts

95
Q

Radial piston air motors require less maintenance that other air motors because they have

A

slower operating speeds

96
Q

The low pressure in the hydraulic end of an air-oil tank system is overcome by the use of

A

large work cylinders

97
Q

The main components of air-oil boosters are the

A

air pistons and hydraulic rams

98
Q

What valve adjusts the makeup and return tank oil levels in a single-pressure booster system?

A

Manual shutoff valve

99
Q

In a combined, single-unit air-oil cylinder, the fluids are separated by

A

a bleeder space

100
Q

One advantage of interlocked independent air-oil systems is their

A

increased speed of operation

101
Q

The best way to determine the correct running clearance in a plain-bearing installation is to

A

consult the manufacturer’s charts and tables

102
Q

The ability of bearing material to dissipate excessive heat generated during operation is called

A

thermal conductivity

103
Q

The ability of bearing material to flow slightly when loaded is called

A

conformability

104
Q

An advantage of grease compared to oil in lubricating a plain bearing is that

A

newly applied grease forces old lubricants out

105
Q

Discoloration in plain bearings is generally a symptom of

A

excessive heat

106
Q

If you must leave your workplace temporarily, what care should you give a new, unmounted anti-friction bearing?

A

Wrap it in oil-resistant paper

107
Q

To prevent creeping of an inner bearing ring around the shaft, you should mount the inner ring with an ___ fit.

A

interference

108
Q

You can force an anti-friction bearing into position on the shaft by using an arbor press or by impact, if the bearing has an O.D. of

A

4 in. or less

109
Q

A bearing is driven up a split tapered adapter by

A

tightening a heavy-duty locknut

110
Q

A bearing running at a temperature above ___F usually indicates trouble.

A

200

111
Q

What is the correct tool to use when removing a locknut from an anti-friction bearing installation?

A

A spanner

112
Q

When you use a puller to remove a taper-mounted bearing, what should you do with the locknut?

A

Back the nut off several turns

113
Q

An aluminum heating ring is designed for mounting and dismounting the inner rings of a

A

cylindrical roller bearing

114
Q

When you use an aluminum heating ring to expand a bearing, heat the ring to

A

500 F

115
Q

If you have cleaned and inspected an anti-friction bearing but do not intend to reuse it immediately, how should you treat it before wrapping it in oil-resistant paper and storing it?

A

Fill it with grease

116
Q

Which type of bearing seal keeps out water, dirt, and contaminants most effectively?

A

Contact seal

117
Q

Which type of anti-friction bearing can tolerate the most internal misalignment?

A

Spherical roller bearing

118
Q

The correct tolerance range for shafts from 2 to 4 inches in diameter is nominal to

A

-0.001 in.

119
Q

When you lubricate bearings with grease, the actual lubricant is ____, which is held in suspension

A

mineral oil

120
Q

As a rule, the interval between lubrication renewals is cut in half for every 27 F increase in temperature above ___ F.

A

160

121
Q

The threads of an acme screw are

A

squared off and thick

122
Q

Ball bearing screws are designed to

A

move loads vertically and horizontally

123
Q

The screw in a ball bearing screw is supported by

A

standard ball bearings

124
Q

In a contact seal, what forms the actual seal?

A

A thin film of oil

125
Q

Before you install a lip seal, you should chamfer the end of the shaft and the leading edge of the housing bore at an angle of ____ to ____ degrees.

A

15; 30

86 (1 decks)

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