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TPC > Test 2 - Hydraulics > Flashcards

Test 2 - Hydraulics Flashcards

1
Q

Force is measured in units of ______ in the metric system?

A
  • newtons
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2
Q

The mass of an object is ???

A
  • a measure of the amount of matter in it
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3
Q

The density of a fluid is expressed in terms of ???

A
  • specific gravity
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4
Q

The number of pounds of force applied to an area is measured in ???

A
  • psi
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5
Q

When calculating the work done by a hydraulic cylinder, you must know the hydraulic pressure and the piston’s ???

A
  • area and stroke
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6
Q

The theory that states that pressure in a confined liquid is distributed equally throughout the fluid is ???

A
  • pascal’s law
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7
Q

If the force ratio between two different hydraulic pistons is a reducing ratio, the piston velocity ???

A
  • increases
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8
Q

Fluid flow in a hydraulic piping system should be ???

A
  • laminar
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9
Q

Which of the following does NOT cause turbulent flow in hydraulic systems?

A
  • large diameter pipes
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10
Q

Bernoulli’s Principle states that the total energy of a hydraulic fluid is ???

A
  • always constant
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11
Q

The functions of a hydraulic fluid include all of the following EXCEPT ???

A
  • generating heat
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12
Q

The viscosity of a fluid is a measure of its ???

A
  • internal friction
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13
Q

A hydraulic fluid with a viscosity of 150 SSU ______ than one with a viscosity of 275 SSU?

A
  • is less viscous
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14
Q

The term that describes the stability of fluid viscosity when it is heated is ???

A
  • viscosity index
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15
Q

Hydraulic oils used for low-temperature applications should have a ???

A
  • low pour point
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16
Q

The ability of a fluid to maintain lubrication between closely fitted parts under load is determined by its ???

A
  • film strength
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17
Q

What type of reaction occurs when a hydraulic fluid oxidizes?

A
  • chemical
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18
Q

It is estimated that the service life of a hydraulic fluid _____ for each 18 to 20°C increase above 54°C

A
  • is reduced by half
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19
Q

Contamination in a hydraulic system can be best controlled by ???

A
  • good maintenance procedures
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20
Q

Corrosion in a hydraulic system generally is caused by all the following EXCEPT

A
  • cavitation
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21
Q

For a hydraulic fluid to function properly over acceptable periods of time, it must ???

A
  • be kept clean
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22
Q

The performance rating of a strainer is based on its ability to remove _____ from the system

A
  • dirt
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23
Q

The point at which a filter allows contaminants to pass through the medium is called the ???

A
  • maximum allowable pressure drop
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24
Q

The medium in a strainer usually is made of ???

A
  • porous wire mesh
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25
Q

Which of the following is NOT true of a filter in a hydraulic system?

A
  • Its openings gradually increase in size
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26
Q

Which of the following is NOT true of depth filters used in highly contaminated fluid conditions?

A
  • They can be cleaned and reused
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27
Q

Wound-yarn filters are used for heavy contaminant concentrations because they ???

A
  • have good removal ratings
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28
Q

How is the filtration area of paper filter media increased?

A
  • pleating
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29
Q

Surface filter media made from sintered metal powders can be used for high-pressure filtration because of their ???

A
  • large mass
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30
Q

When working on or around a hydraulic system, alway remember that the system may be ???

A
  • pressurized
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31
Q

In order to separate contaminants from hydraulic fluid in the reservoir, the fluid must be ???

A
  • moved slowly
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32
Q

The bottom of a hydraulic fluid reservoir should NOT be ???

A
  • flat
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33
Q

A hydraulic reservoir relies on an interior baffle to ???

A
  • help heat transfer
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34
Q

What method is NOT used to maintain the temperature of hydraulic fluid at an acceptable level?

A
  • using reservoir with thick side walls
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35
Q

Most liquid-cooled heat exchangers transfer heat by means of ???

A
  • separated fluids moving in the opposite direction
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36
Q

For what reason is an air breather installed on a reservoir?

A
  • Prevent pressure buildup
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37
Q

An accumulator is used in a hydraulic system for all of the following EXCEPT to ???

A
  • take the place of the pump
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38
Q

Because of their non-mechanical design, air-bottle accumulators should NOT be used with ???

A
  • high-speed pumps
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39
Q

Which of the following is the correct procedure to use when charging a bladder accumulator?

A
  • Preload gas, then fluid
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40
Q

A distinctive characteristic of a differential-piston accumulator is that is reduces ???

A
  • fluid volume
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41
Q

A hydraulic pump does all of the following EXCEPT ???

A
  • produce the working pressure in the system
42
Q

Which of the following types of pumps is NOT a positive-displacement pump?

A
  • centrifugal
43
Q

The volume of delivery of a fixed-displacement pump ???

A
  • can be changed by changing the pump’s speed
44
Q

The capacity of a pump may be specified in all of the following EXCEPT ???

A
  • pounds per square inch
45
Q

The efficient operating life of a pump is usually given in terms of ???

A
  • hours
46
Q

Because of their design, internal gear pumps are limited to applications having ???

A
  • small capacities and low pressures
47
Q

A vane pump of the unbalanced design can be identified by its ???

A
  • off-center rotor
48
Q

The vane tips of a vane pump usually are grooved or split to permit all of the following EXCEPT ???

A
  • a larger contact area at the housing
49
Q

Variable-displacement vane pumps control fluid flow by ???

A
  • shifting the cam ring
50
Q

Radial-piston pumps generally are designed and manufactured with a ???

A
  • rotating or stationary block
51
Q

When selecting a hydraulic line, the most important factor to consider is the ???

A
  • fluid flow rate
52
Q

Resistance to fluid flow in a hydraulic system is increased by ???

A
  • pipe restrictions
53
Q

Which of the following does NOT contribute to pressure loss in a hydraulic line?

A
  • direction of flow
54
Q

Hydraulic lines should NOT be made from ???

A
  • galvanized pipe
55
Q

Steel piping may be used for hydraulic lines under all the following conditions EXCEPT ???

A
  • when the hydraulic lines are short and contain many bends
56
Q

When tubing is bent, which of the following does NOT apply to the bend?

A
  • it should be formed by hand
57
Q

Which of the following is a proper procedure for installing hydraulic tubing?

A
  • Support long tubing runs with clamps or hangers
58
Q

A disadvantage of hoses in hydraulic lines is that they ???

A
  • wear from flexing
59
Q

Hydraulic hoses should not be used for temperatures above ???

A
  • 450°F
60
Q

Most hydraulic hoses are rated with a safety factor of ???

A
  • 4
61
Q

Directional control valves do all of the following EXCEPT ???

A
  • relieve excess pressure
62
Q

Directional control valves are NOT classified by the number of ???

A
  • pipe threads
63
Q

Some manually operated two-way valves are NOT suitable for hydraulic service because of their ???

A
  • low pressure ratings
64
Q

The closing force of a solenoid-operated valve is usually limited to ???

A
  • 15 lbs
65
Q

The pressure at which a check valve will start to oped is called its ???

A
  • cracking pressure
66
Q

Spool valves usually are partially balanced because of their ???

A
  • construction
67
Q

Three-way spool valves are made with three ???

A
  • primary connections
68
Q

Selector and diverter three-way valves differ in their ???

A
  • internal construction
69
Q

A three-position, four-way valve is referred to as a ???

A
  • closed crossover valve
70
Q

Rotary spool valves can be manufactured to operate as all of the following EXCEPT ???

A
  • five-way valves
71
Q

A pressure-reducing valve is a ???

A
  • normally open two-way valve
72
Q

What is another term for the maximum pressure of a poppet relief valve?

A
  • set pressure
73
Q

What is the pressure at the discharge (outlet) of a sequence valve?

A
  • line pressure
74
Q

A counterbalance valve is usually constructed as a ???

A
  • double poppet
75
Q

Unloading valves usually are made for _____ operation?

A
  • pilot
76
Q

Pressure-reducing valves limit pressure ???

A
  • in one part of the system
77
Q

Hydraulic shock in a system is controlled by a ???

A
  • shock suppressor
78
Q

The speed of a hydraulic actuator is controlled by what characteristic of the hydraulic system?

A
  • flow
79
Q

A flow-controlled valve can be positioned to operate in all of the following ways EXCEPT ???

A
  • counterbalance
80
Q

A pressure-compensation valve senses pressure at the ???

A
  • downstream valve outlet
81
Q

Hydraulic cylinders convert fluid force into ???

A
  • straight-line motion
82
Q

In a double-acting cylinder, the thrust is ???

A
  • greater when the piston forces the piston rod out of the cylinder
83
Q

A double-end rod cylinder has a piston surface area that is ???

A
  • equal on both sides
84
Q

Which of the following is true of a ram cylinder?

A
  • it usually does not require piston seals
85
Q

The pistons of a two-piston cylinder always move ???

A
  • independently
86
Q

The end caps or heads of most industrial hydraulic cylinders are held in place by ???

A
  • tie rods
87
Q

Cylinders that move heavy thrust loads usually are furnished with ???

A
  • square flanges
88
Q

To select the proper hydraulic cylinder for use in a existing system, you must know all the following EXCEPT ???

A
  • piston speed
89
Q

To determine the total cylinder force, you must multiply the load times the acceleration factor and add the ???

A
  • frictional resistance
90
Q

What is the purpose of the cushioning device used with a hydraulic cylinder?

A
  • prevent mechanical shock
91
Q

The speed of a hydraulic motor is determined by the fluid’s ???

A
  • flow rate
92
Q

All hydraulic motors are _____ motors

A
  • positive-displacement
93
Q

The maximum fluid pressure that a motor can withstand is defined by ???

A
  • its pressure range
94
Q

The force exerted by a hydraulic motor while operating normally is called ???

A
  • running torque
95
Q

When a new hydraulic motor is installed in an existing system, its compatibility must be checked against all of the following EXCEPT the ???

A
  • piping material
96
Q

The service life of a hydraulic motor is given in ???

A
  • hours of operation
97
Q

The pressure of the hydraulic fluid entering an internal gear motor acts on the ???

A
  • gear teeth
98
Q

Gear motors frequently are equipped with wear plates to prevent ???

A
  • internal leakage
99
Q

Which of the following characteristics applies to variable-displacement hydraulic motors?

A
  • high slippage rates
100
Q

How far can vane-type rotary actuators rotate?

A
  • just under one revolution

TPC (5 decks)

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