8th 6 Months Final Flashcards
(125 cards)
1
Q
To what type of energy does a hydraulic system convert electrical energy?
A
Usable
2
Q
What is the function of a control valve in a hydraulic system?
A
All of the above
3
Q
The hydraulic fluid in a system must be able to transmit power and
A
lubricate the system
4
Q
Before working on a hydraulic system, the most important requirement is to
A
understand the system’s operation
5
Q
If a hydraulic system is to function properly, it must
A
have all components installed correctly
6
Q
Which of the following types of drawings illustrate the general location and appearance of a system’s elements?
A
Pictorial
7
Q
What type of drawing illustrates the elements that make up a hydraulic system?
A
Schematic
8
Q
On a schematic drawing, hydraulic components are represented by
A
symbols
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
10
Q
A schematic drawing of a hydraulic control valve illustrates fluid flow and
A
valve function
11
Q
When installing hydraulic components, you should follow the installation techniques that
A
are required for each component
12
Q
In order to provide proper alignments between a hydraulic pump and the driving motor, you should always
A
install the pump first
13
Q
Which of these procedures should be followed when starting a newly installed pump?
A
Jog the drive motor
14
Q
A stack of hydraulic control valves held together by bolts is called a
A
manifold
15
Q
Which of the following statements about installing solenoid valves is NOT true?
A
Clip off the leads at the valve
16
Q
Pump suction or inlet pipes should always be equal to or larger than the
A
pump intake
17
Q
Which of the following must be considered when selecting hydraulic tubing?
A
All of the above
18
Q
Which of the following should be avoided when assembling tubing?
A
Straight line connections
19
Q
The disadvantage of using hydraulic hose in a hydraulic system is that it
A
wears out more quickly than tubing
20
Q
Which of the following best describes most seals used in hydraulic components?
A
Preformed
21
Q
What is the primary function of a hydraulic fluid?
A
Transmit force and energy
22
Q
The lubricating capacity of a hydraulic fluid is dependent mostly upon its
A
viscosity
23
Q
Which of the following items affects hydraulic fluid viscosity the most?
A
temperature
24
Q
When you select a hydraulic fluid, always make sure it is
A
compatible with the system
25
Before filling a hydraulic system with hydraulic fluid, always make sure of the
system being clean
26
The interval of time between inspections on a specific hydraulic system depends on the
type of the system
27
Because inspections are made to locate trouble before a breakdown occurs, they are
preventive maintenance
28
After how many operating hours should the fluid in a hydraulic system be sent out for laboratory analysis?
1000
29
In many cases, repair maintenance can be scheduled for a later time. Under what conditions should this procedure NOT be followed?
When a safety hazard exists
30
When should hydraulic systems elements be reconditioned?
Periodically, and whenever they break down
31
Troubleshooting is best described as a means of determining trouble in a system by
means of a logical sequence
32
Prior to troubleshooting a hydraulic system, you should first evaluate the symptoms and then
determine the cause
33
The best way to protect a pressure gauge from surges is by
using a snubber with the gauge
34
When are fluid flow meters or gauges most commonly used in a hydraulic system?
During testing
35
Which of the following documents is the most helpful in solving a hydraulic system problem?
Maintenance record
36
The best way to determine if a valve is the cause of a system malfunction is to
test the circuit
37
Whenever a valve is disassembled for inspection or repair, you should always
replace the seals
38
Which of the following causes sludge formation?
Overheating of the hydraulic fluid
39
Which of the following could cause solenoid-coil burnout in a directional control valve?
All of the above
40
Which of the following tells how directional control valves should always be reassembled?
Carefully
41
Cylinder rod misalignment is usually caused by
side loading
42
A probable cause of an immovable or slow-moving cylinder may be
a blocked speed control valve
43
Which of the following hydraulic fluids is suitable for fire-resistant applications?
All of the above
44
Before connecting a cylinder to the hydraulic system, you should first
clean the piping system
45
Which of the following items is essential to proper cylinder performance?
Accurate mounting
46
Visual inspection of an operating hydraulic pump or motor is limited, because
You cannot see the internal parts
47
Broken pump rotors, fractured teeth or vanes, and repeated seal blowout are usually caused by
pressure shocks
48
Excessive wear and roughness in a gear pump are indications of
solid contaminants in the system
49
It is important to keep all contaminants out of piston pumps because of the pump's
close-tolerance construction
50
It is good maintenance practice to replace which of the following when a hydraulic pump is repaired?
Anti-friction bearings, gaskets, and seals
51
What results when the volume of air in an air compressor is decreased?
Pressure increases
52
A dynamic air compressor is frequently referred to as a
non-positive displacement compressor
53
The size of a compressor air intake filter is determined by the
intake requirements
54
Corrosion-resistance piping is used in pneumatic systems to
extend pipe service life
55
After lubricating oil has been introduced into an air line, what is the recommended maximum distance that the air should travel?
30 ft
56
What kind o f drawings should be used to show the interconnections between components
Pictorial
57
What is generally illustrated in a schematic drawing?
Functions and operations
58
Pilot or signal lines are shown on a schematic drawing as
a series of long dashes
59
A schematic diagram can best be understood if the drawing is
studied in small segments
60
Special schematic symbols are usually devised and drawn by the
component manufacturer
61
In accordance with the American Society of Manufacturing Engineers' code, air receivers must be equipped with safety valves and
pressure gauges
62
Slightly over-sized pipe
can help accommodate additional demands
63
What is the proper spacing for pipe supports or hangers?
Close enough to prevent sag
64
What should you do if an air leak occurs at a flared fitting?
Replace the flare
65
What is the proper length for hoses used to connect pneumatic components?
Only as long as necessary
66
A good planned maintenance program requires
regular equipment checks
67
A pneumatic system operated with excessive air pressure will usually have
accelerated wear
68
Most control valves in a pneumatic system are designed for use with pressure up to
150 psi
69
The best time to perform a daily check on compressor room equipment is
early in the shift
70
The operating cycles of control valves and cylinders used on production lines are usually entered in the
production record
71
Which of the following determines what troubleshooting checks to make in a pneumatic system?
The type and number of components
72
When you are troubleshooting a pneumatic system, first check the
supply air pressure
73
Which of the following would NOT be in the description section of an operations manual?
Troubleshooting procedures
74
Piston seals can be checked for leakage by
observing the exhaust port for air
75
Which of the following should you always inspect when troubleshooting a manually operated control valve for sluggish action?
Moving parts
76
Heat generated in the cylinder of a compressor during the compression stroke is best controlled by cooling the compressor and
limiting the compression pressure
77
An air compressor operating in a dusty or oily atmosphere should be cleaned at regular intervals with a
detergent
78
Which of the following causes the greatest discharge valve wear in a compressor?
Carbon deposits
79
A motor starting controller on a compressor is checked for proper operation by starting the compressor after the
reservoir pressure has been relieved
80
Which of the following is NOT a maintenance consideration common to all rotary compressors?
Intake valves
81
The best way of locating air control valve problems is to analyze the performance of the
circuit components
82
`Loss of power in a pneumatic control circuit can cause the circuit to
get out of sequence
83
What is used to activate a solenoid on a pneumatic control valve?
An electric current
84
A control valve that will shift manually, but not automatically, is likely to have
low air pressure
85
The use of an improper lubricant in a control valve may result in all of the following EXCEPT
shifting without a signal
86
What type of pneumatic cylinder is used for most industrial applications?
tie rod
87
The primary purpose of a piston rod bushing is to
act as a bearing
88
Above what temperature do pneumatic cylinders require special seals?
200 F
89
Improperly tightened or torqued tie rods on pneumatic cylinders will cause
internal misaligntment
90
What is the function of pneumatic cylinder cushions?
Prevent cylinder damage
91
The normal service life of air motors can be improved by
clean, filtered air
92
Which of the following is a proper lubricant to use when installing hose couplings?
Soapy solution
93
Air motors require careful handling during disassembly and assembly because they are
precision-built
94
Special attention should be given to the ____ of pneumatic grinders.
arbor shafts
95
Radial piston air motors require less maintenance that other air motors because they have
slower operating speeds
96
The low pressure in the hydraulic end of an air-oil tank system is overcome by the use of
large work cylinders
97
The main components of air-oil boosters are the
air pistons and hydraulic rams
98
What valve adjusts the makeup and return tank oil levels in a single-pressure booster system?
Manual shutoff valve
99
In a combined, single-unit air-oil cylinder, the fluids are separated by
a bleeder space
100
One advantage of interlocked independent air-oil systems is their
increased speed of operation
101
The best way to determine the correct running clearance in a plain-bearing installation is to
consult the manufacturer's charts and tables
102
The ability of bearing material to dissipate excessive heat generated during operation is called
thermal conductivity
103
The ability of bearing material to flow slightly when loaded is called
conformability
104
An advantage of grease compared to oil in lubricating a plain bearing is that
newly applied grease forces old lubricants out
105
Discoloration in plain bearings is generally a symptom of
excessive heat
106
If you must leave your workplace temporarily, what care should you give a new, unmounted anti-friction bearing?
Wrap it in oil-resistant paper
107
To prevent creeping of an inner bearing ring around the shaft, you should mount the inner ring with an ___ fit.
interference
108
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
4 in. or less
109
A bearing is driven up a split tapered adapter by
tightening a heavy-duty locknut
110
A bearing running at a temperature above ___F usually indicates trouble.
200
111
What is the correct tool to use when removing a locknut from an anti-friction bearing installation?
A spanner
112
When you use a puller to remove a taper-mounted bearing, what should you do with the locknut?
Back the nut off several turns
113
An aluminum heating ring is designed for mounting and dismounting the inner rings of a
cylindrical roller bearing
114
When you use an aluminum heating ring to expand a bearing, heat the ring to
500 F
115
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?
Fill it with grease
116
Which type of bearing seal keeps out water, dirt, and contaminants most effectively?
Contact seal
117
Which type of anti-friction bearing can tolerate the most internal misalignment?
Spherical roller bearing
118
The correct tolerance range for shafts from 2 to 4 inches in diameter is nominal to
-0.001 in.
119
When you lubricate bearings with grease, the actual lubricant is ____, which is held in suspension
mineral oil
120
As a rule, the interval between lubrication renewals is cut in half for every 27 F increase in temperature above ___ F.
160
121
The threads of an acme screw are
squared off and thick
122
Ball bearing screws are designed to
move loads vertically and horizontally
123
The screw in a ball bearing screw is supported by
standard ball bearings
124
In a contact seal, what forms the actual seal?
A thin film of oil
125
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.
15; 30
