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3rd Sixth Month > Final > Flashcards

Final Flashcards

1
Q

Pipes up to 12 inches diameter are usually designated by

A

It’s nominal inside diameter

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2
Q

The most distinguished feature on a pipe thread is

A

It’s taper

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3
Q

Rubber gaskets are generally used when

A

There are low pressures and cold services

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4
Q

To differentiate between pipes carrying different substances pipe systems are

A

Often color-coded

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5
Q

All pipe system should be installed in accordance with the

A

American standard code for pressure piping

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6
Q

In general piping should be supported to provide the necessary rigidity to prevent

A

All three, metal fatigue, to prevent sagging to provide drainage

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7
Q

Self cleaning strainers are used to

A

Automatically strain raw water to remove silt and debris

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8
Q

Pressure, equalizing, lines reduce, where and

A

Make large valves easier to open,

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9
Q

Plastic pipe is inert and continuous service to all

A

Acids, caustics, solvent. Most likely not used for oils.

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10
Q

Some pipe may be coated to

A

Prevent external or internal, corrosion and erosion, to prevent heat loss

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11
Q

A line used to control the concentration of impurities in a pressure vessel

A

A blow down line

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12
Q

Which type of pipe would be affected the least by corrosion

A

Stainless steel

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13
Q

(Work) equals in a cylinder

A

Force times piston, travel 

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14
Q

Most compressors, such as the reciprocating compressor are

A

Of the positive displacement type

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15
Q

The purpose of an intercooler on a two stage air compressor is

A

It reduces the power needed on a two-stage compressor

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16
Q

The advantage of unloading a compressor is

A

It can run without delivering air

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17
Q

Single stage vein compressors are capable of developing up to

A

50 psi

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18
Q

Unlike piston or reciprocating compressors, this type of compressor operates at speeds between 3000 and 12,000 RPM

A

Screw or rotary

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19
Q

The impeller compressor is designed for

A

High volume rather than high-pressure to deliver air

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20
Q

If temperature increases as the pressure increases, what happens to the air

A

The ability of the compressed air to hold moisture also increases

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21
Q

Water cooling in compressors is economical for

A

Medium size compressors for more than eight hours, a day and larger compressors operating more than 10 hours a day

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22
Q

During peak flow periods, air stored in the lines and in the air receiver will

A

Keep the overall system pressure from dropping too low if it cannot another or larger receivers were required

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23
Q

Inertial separators in a pneumatic circuit depend on the inertia of a heavy, moving particle to

A

Aid in the separation,the faster it is moving ,more rapid change in airflow

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24
Q

In addition to dust in cloud, particles, compressed air has

A

Very fine oil particles in the .01 2.8 µm range also called aerosols

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25
Q

If a filter stops 100% of a given particle size this is called

A

Absolute rating

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26
Q

The pros of a fine lubricator are

A

The lubrication is carried greater distances from the lubricator and is effective with equipment that is intermittent

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27
Q

Laminar airflow in a pneumatic circuit is

A

When an airline can handle the volume of air, that it flows through with no obstructions

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28
Q

When installed as compressor discharge and distribution lines, all horizontal pipe should slope approximately

A

1 inch for every 10 foot of pipe downward

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29
Q

While , disconnecting airlines where eye protection because

A

A blast of escaping air can blow dirt or chips into your eyes or face

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30
Q

A needle valve is a two way valve and an excellent valve for

A

High-pressure service as a throttling or flavored reducing valve

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31
Q

Spool valves operate in high pressures, and

A

Controls air by sliding and is easy to move

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32
Q

Five way valves have five external connections, many four-way valves have

A

Two external exhaust ports

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33
Q

A diaphragm relief valve, responding to increasing air pressure opens much faster than a poppet valve

A

The diaphragm valve has a larger pressure sensitive area than a poppet

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34
Q

Pressure relief valves only job is

A

To protect the system, and its components from damage

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35
Q

Regulator valve closes when discharge pressure increases when the secondary pressure equals spring pressure

A

The ceiling element is pulled upward closing off the valve opening

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36
Q

The best way to guard against successive pressure in a regulator is

A

By relieving low volume excess pressure in the secondary pressure line, if large buildup occur, a separate relief valve must be provided

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37
Q

On double acting cylinders, because the rod takes up some of the surface area of the piston

A

Less pressure can be exerted on the rod side, then on the cap side of the piston

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38
Q

To limit the return, stroke speed of a cylinder is usually controlled by

A

An exhaust flow control metering valve

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39
Q

Pivoted cylinder mountings are crossed as being

A

Tonyan or Cuevas, mounting it is a cylinder that must be free to pivot

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40
Q

Checking the control valve to determine if it is capable of handling, the air of a cylinder is referred to as

A

Is referred to as calculating the capacity coefficient

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41
Q

Piston motors, have a stalling torque, almost double

A

The starting torque

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42
Q

It’s typical horsepower curve for a pneumatic motor shows that maximum power output is

A

Obtained at medium speed and medium torque output

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43
Q

On piston motors, the cam attached to the offset shaft causes

A

The camp plate to rotate ,this motion is transferred through gears to the output shaft

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44
Q

In an air boosters, an air pressure of 100 psi can create hydraulic pressure of

A

1000 psi if the air piston drives a small diameter hydraulic piston

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45
Q

Fluid is any substance that is like

A

A liquid or a gas that flows

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46
Q

A steam line is to direct The steam to the trap

A

which bleeds the hot water out of the system

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47
Q

Pipe fittings like elbows are the parts that connect

A

Sections of pipe, sections of hoses, and sections of tubing

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48
Q

Sludge and corrosion can reduce the inside diameter of pipe that results in

A

A reduction in pressure

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49
Q

It is a rule that if the speed of a fluid is double

A

The friction is increased four times what it was before

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50
Q

Above 12 inches a pipe is ordinarily designated

A

By its outside diameter

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51
Q

Utility or service lines Carry

A

Steam, gas, water, compressed, air, and air conditioning fluids

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52
Q

A metal that contains iron is called

A

Ferrous metal

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53
Q

As viscosity rises in pipes, so does what

A

Friction also rises in the pipe

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54
Q

Water hammer is when

A

Water in a pipe is suddenly stopped or slowed

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55
Q

The most corrosive proof available pipe for industrial and sewage waste is

A

Vitrified clay pipe

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56
Q

A similar pipe to concrete with reinforcing rods and rings, but in addition, a welded steel shell embedded in the concrete is

A

Cylinder concrete pipe

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57
Q

Plastic pipe rarely has to be insulated, because

A

It is self insulating

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58
Q

Is suite disadvantage of threading pipe is

A

The threading weekends, the wall strength of the pipe

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59
Q

The advantages of glass pipe include

A

It’s great resistance to corrosion, contamination, and heat

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60
Q

Most tubing is very flexible and has some give to them this allows tubing to

A

Tubing can withstand vibration

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61
Q

Tubing eliminates fittings

A

They are flexible and can be run from one point to another with fewer fittings then if Piper used

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62
Q

Stainless steel tubing should be cut rapidly because

A

When stainless steel tubing is cut, it can become work hardened

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63
Q

Aluminum tubing joints are made by

A

Brazing, and by gas or arc welding

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64
Q

Solvent, cementing and heating fusion welding are

A

The methods of joining plastic tubing by fusion

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65
Q

To determine the size of a hose simply convert the size into sixteenths a one and 1/4 can be pronounced as

A

– 20

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66
Q

A hose with two layers of high strength synthetic cord reinforcement is called

A

Braided hose

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67
Q

Vacuum rating on a hose refers to

A

The degree of vacuum that is created before a hose begins to collapse

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68
Q

Teflon is using applications where hoses are required to carry

A

Corrosive, fluids and fluids at temperatures of up to 450°F

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69
Q

When a hose is damaged, the proper repair is

A

Cut off at least 1 foot of the hose beyond the damage area before recouping, then reverse the ends of the hoses

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70
Q

The standard of fittings 250 pound refers to

A

The pressure at which the fitting can be safely used

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71
Q

In the long radius, elbow the center to face distance is

A

Always one and a half times the diameter of the fitting

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72
Q

In the short radius, elbow fitting the sensor to face measurement equals

A

The pipe diameter, C divided by F equals D

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73
Q

With fittings, high temperature lines are usually made up with

A

A large, bend or loop to allow for expansion

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74
Q

In piping systems Aside from the main purpose, vibration, dampers, also help reduce

A

The effects of water hammer

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75
Q

Valves are made in a full range of sizes which match pipe and tubing sizes for example, a 3 inch valve would be selected for use in a pipeline width

A

A 3 inch diameter

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76
Q

Needle valves are used for very accurate

A

Throttling

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77
Q

In the swing check valve the closing element swings open and shut like trap doors. What type of flow does this valve offer

A

Little resistance to flow

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78
Q

The seal in an industrial valve is the same part that is called

A

Washer in a household valve

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79
Q

The separation of the Bonet assembly from the fluid line in a diaphragm valve, makes it excellent for use and applications

A

Where the fluid must be contaminant free

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80
Q

The 5 360 turns of the hand wheel on a blow valve, insures that the operation it started slowly, and

A

Prevent shock to the system

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81
Q

Pressure regulating valves demand are

A

Constantly changing

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82
Q

Where are safety valves referred to valves with gases and steam? A relief valve is used with.

A

Liquids

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83
Q

The particular advantage to ruptured disc relief valves is that

A

It can relieve large volumes of gas or liquid quickly

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84
Q

Solid particles in a high-pressure line can damage a valve in two ways

A

It can clog the valve so that it cannot close tightly and it wears away at the closing machine valve parts

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85
Q

For duplex filters when one filter element needs cleaning

A

The other side of the duplex unit is switched into service

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86
Q

Differential pressure is the difference in

A

PSI between the inlet and outlet pressures

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87
Q

If the line carrying dry saturated steam, at a pressure of 100 psi and a temperature of 338 Fahrenheit or below and there’s a dropping pressure somewhere

A

The saturated steam will change into superheated steam

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88
Q

Trap maintenance includes

A

Periodic, cleaning, removing sludge that interferes with valve action 

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89
Q

Absolute pressure is

A

Gauge pressure +14.7 pounds of atmospheric pressure

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90
Q

The bulb of a mercury temperature gauge is in capillary tube are contained inside a protective

A

Metal tube

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91
Q

The function of a vacuum (siphon)breaker is

A

To admit air into the line , whenever a vacuum develops

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92
Q

When adjusted for desired pressure, the regulator automatically

A

Maintains that pressure

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93
Q

Water cooled after coolers purpose are

A

To cool the hot air coming from the compressor

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94
Q

A compressor takes a volume of air from the atmosphere and

A

And compresses it into a smaller volume to increase its pressure

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95
Q

The size of compressor filters is generally determined by

A

The machines intake requirements

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96
Q

Why should corrosion resistant piping be used?

A

Because water also tends to promote rust and scale buildup in pipes and fittings

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97
Q

After lubricating oil is added to the airline air should travel no more than

A

About 30 feet

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98
Q

Pictoral symbols on a diagram are very useful for showing

A

The physical relationship and interconnections between components

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99
Q

Schematic symbols on a diagram, more clearly emphasize

A

The function and method of operation of components 

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100
Q

Pilot or signal lines are drawn as

A

A series of long dashes

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101
Q

Understanding a pneumatic circuit can best be accomplished by

A

Studying small segments at a time

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102
Q

Symbols for special devices are drawn by

A

The manufacturer

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103
Q

Receivers must be equipped with pressure, gauges, and safety valves according to

A

A SME the American society of mechanical engineers

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104
Q

When installing pipe into a system, it is better to select a slightly oversized pipe because

A

It can accommodate additional demands

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105
Q

Pipe support spacing should be

A

Close enough together to prevent any appreciable SAG

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106
Q

In tubing fitting leaks, never take a chance if the flares not good you should

A

Cut it off and do it over

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107
Q

The best way to conduct plant maintenance is

A

With a plan maintenance program where all equipment is checked on a regular basis

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108
Q

Within pipe systems, excessive pressure results in

A

Accelerated where, possible overstressing, and premature failure of parts

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109
Q

Air control valves for industrial control circuits are

A

For the most part designed and built for use with pressures up to 150 psi

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110
Q

It is best to check the items on a maintenance login records at least once in the shift it is best to do this when

A

Early in the shift or at the beginning

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111
Q

Records of control valve and cylinder operating cycles are usually obtained from

A

Production records

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112
Q

Troubleshooting checks are determined by the

A

Type and number of components in the system

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113
Q

When locating trouble in a system, if there is air pressure in the supply , the sequence would

A

Start at the Air Supply and proceeded to the system actuator

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114
Q

Within the operations manual under general information, what is not in the system description and operation section

A

Troubleshooting procedures

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115
Q

When piston seals become worn and a leak check for leakage

A

by observing the exhaust ports

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116
Q

If the control valve action is sluggish, you must check

A

The moving parts for insufficient lubrication or swollen seals

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117
Q

Sheet generated during compression is controlled by

A

Limiting the pressure of the compressed air 

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118
Q

It’s a surrounding air around a cylinder is dusty or oily you must

A

Frequently clean with a detergent or steam

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119
Q

Valve wear of discharge valves is a result of?

A

Heat and accumulation of carbon deposits

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120
Q

In motor starting controls one way to check if the unloader is the problem you must

A

Let out all the air in the compressor reservoir and start the compressor again

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121
Q

Out of lubrication bearings and seals and intake valves, which maintenance item is not the same for all rotary compressions

A

Intake valves are not the same maintenance item

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122
Q

In troubleshooting controls, a control malfunction can best be isolated by

A

Analyzing the performance or lack of performance of the components and the pneumatic circuit

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123
Q

If there’s a loss of power in the pneumatic circuit, the system goes into

A

The system goes into manual

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124
Q

Solenoids are activated by

A

Ajit field set up by the flow of electrical current

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125
Q

If the valve has low air pressure, it can be shifted manually but

A

The circuit response may still not be correct

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126
Q

The use of improper lubricant in a control valve will not cause it to

A

Shift without a signal

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127
Q

Within a cylinder, tie rod cylinders are used mostly in

A

Industrial applications

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128
Q

This gland access the support or bearing for the piston rod as the travels back-and-forth during its work cycle

A

A bushing

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129
Q

Applications regarding a cylinder that involve higher temperatures or 200°F require

A

Special seals for the cylinder

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130
Q

Often improperly torqued which causes internal misalignment within the cylinder this is

A

Tie rod

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131
Q

The function of an internal cushion is to

A

Protect the cylinder from damage

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132
Q

When installing couplings on a hose, if the fitting is difficult, you must

A

Lubricate the nipple and the inside of the hose with a soapy solution

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133
Q

When you repair air motors or tools remember that they are precision built you must

A

Exercise care when disassembling and assembling them

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134
Q

The service life of air motors is limited unless

A

The air is clean, dry, and filtered

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135
Q

When inspecting a grinder gives special attention to

A

The arbor or motor shaft of an automatic grinder

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136
Q

Because of their slower operating speeds this air motor requires less maintenance than other air motors

A

Radial , piston air motors

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137
Q

The lower pressure in air oil tanks is overcome by

A

Relatively large work cylinders are required for anything except low output force

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138
Q

The main components in an air hydraulic booster, are it

A

Air, piston and hydraulic ram

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139
Q

Within single pressure booster systems, the manual shut off valve is used to

A

Adjust the oil levels between the make up tank and return tank as required

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140
Q

With an air oil cylinders possibility of air leakage is eliminated by

A

Placing a bleeder space or passage between the two sets of rod seals in the center of the unit

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141
Q

Another way of combining hydraulic and pneumatic systems is by interlocking their independent actions. The two independent systems are used for.

A

Economy and speed

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142
Q

But because the electric power sources do not always deliver their power output in a directly usable form , hydraulic systems

A

Convert electrical energy into usable energy

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143
Q

The function of a control valve in a system is

A

All of the above controls, the path controls the flow and controls the pressure

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144
Q

Fluid transmits hydraulic power through the system, but it also serves the important function of

A

Lubricating the hydraulic equipment

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145
Q

Before working on system, the first thing to understand is

A

The operation of the basic machine or system installed

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146
Q

In order for the system to provide correct hydraulic action, the valves and other components must be

A

Installed correctly

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147
Q

This diagram shows the general location, purpose, and appearance of the systems elements

A

A pictorial diagram

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148
Q

What illustrates the elements that make up a hydraulic system

A

All types of diagrams, pictorial, cutaway, and schematic diagrams illustrates the elements that make up a hydraulic system

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149
Q

These are used in a diagram to show the elements of the system shown as a device or a sign that stands for something

A

Schematic symbols

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150
Q

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

A

Get the overall view of the system

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151
Q

The control valve symbol on a diagram, illustrates fluid flow and

A

Shows the valves function

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152
Q

Each major component in a hydraulic system has its own particular

A

Installation techniques that must be considered during installation

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153
Q

To provide proper alignment between pump and drive motor, this should be used

A

Flexible, coupling

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154
Q

You must jog the drive when starting a newly installed pump to

A

Make sure that rotation direction is correct before running the system

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155
Q

When hydraulic control valves are held together by bolts this is called

A

Manifold Ing only the four way valve is piped using this method

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156
Q

Which statement is not true about installing solenoids

A

Clipping off, the solenoid leads is not a good tip for installing solenoids

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157
Q

ForThe inlet piping of a pump, the diameter of the pipe should not be smaller than

A

The intake of the pump it should be larger

158
Q

What considerations must be thought of while selecting tubing

A

All of the above the material ID and the wall thickness

159
Q

Within tubing installations and bending tubing should not be assembled or connected in a straight line this is because

A

In the connection of tubing helps eliminate strain by absorbing vibration

160
Q

The main advantage and disadvantage of using a hydraulic hose as it’s flexibility. These are also the reasons why

A

The hose wears out more rapidly than either pipe or tubing

161
Q

Most seals used in hydraulic components, are designed engineers it is not your job to

A

Rectify to the design problems

162
Q

The primary function of a hydraulic fluid is

A

To transmit efficiently, the force and energy

163
Q

One of lubrications, most important properties of fluid are

A

It’s viscosity

164
Q

Viscosity’s greatest item of affection is

A

Temperature

165
Q

When selecting fluids for a system, you must make sure it is first

A

Compatible with the system

166
Q

A precautionary step before filling a system with fluid you must make sure it is

A

Just make sure the system is clean

167
Q

Time between inspections ,depends on other systems, and

A

The location of identical systems in the plant

168
Q

Looking for possible troubles before they occur is preventative maintenance. Inspection is a form of.

A

Preventative maintenance

169
Q

When A sample of fluid quality should be taken at in oil system is

A

Twice a year or every thousand hours

170
Q

Repair being scheduled later should not be followed when

A

When safety is in line of production, never sacrifice safety for production

171
Q

Reconditioning system is best to do when

A

The system has run for two years or breaks down

172
Q

When troubleshooting listening to the pump is the only way of finding the problem because

A

A visual inspection is not possible until the pump has been disassembled

173
Q

Pressure shocks in a positive displacement pump may cause other failures, such as

A

Repeated shaft, seal, blowout, broken rotor, segments, cracked, and broken veins and teeth

174
Q

Excessive wear scratches or roughness in a gear pump means that

A

The system is compromised with solid contaminants

175
Q

It is important that contaminants are kept out of the piston pumps because

A

They are manufactured with close tolerances

176
Q

When any type of hydraulic pump is being repaired it is good general practice

A

Replace all anti-friction bearings, shaft seals and gaskets

177
Q

Plasma performs what essential function when breaking a circuit

A

Allows flow between two open circuits

178
Q

Protective feature a __________ is provided if gas pressure becomes to great in the chamber

A

Safety valve

179
Q

True or false air blast breakers are greater than oil cooling breakers

A

True

180
Q

An air circuit breaker employs air as the interrupting ______________

A

Insulation medium

181
Q

Within circuit breaker controls a trip free operation occurs when the breaker is

A

Closed on a fault

182
Q

The function of circuit breaker auxiliary contacts are to

A

Open first and close last

183
Q

How is air for a breaker operation dried

A

By conducting it through automatic drying system

184
Q

Transformers permit the transfer of electric energy between to circuits which are

A

Completely insulated from each other

185
Q

In a transformer the winding that receives the voltage is called the

A

Secondary winding

186
Q

Bushings are used on transformers to by

A

Insulating the leads and serve as entrances to the transformer

187
Q

Transformers are classified as static or non static machines?

A

Static machines

188
Q

When the secondary winding has more turns than the primary a greater voltage will be induced to the secondary and will be known as a

A

Step up transformer

189
Q

To maintain the required primary current to supply the transformer losses and secondary load the transformer must have a

A

Balanced conditions

190
Q

The input component of a hydraulic power transmission system is called a, the output is called

A

The input is called a pump and the output is called an actuator

191
Q

The power source of a hydraulic system is a prime mover, such as

A

An electric motor or an engine

192
Q

Which port limits the max PSI to the directional control valve

A

The inlet port

193
Q

What pushes fluid into the pumping chamber to fill the void and charge the pump?

A

Atmospheric pressure

194
Q

Pressure is generated in a hydraulic system by

A

The resistance of a load

195
Q

In this mathematical formula with the variables, pressure force in area what is the equation?

A

Pressure equals force divided by area

196
Q

Inlet pressure of a pump is usually measured in

A

Inches of mercury

197
Q

Which parts of a hydraulic system is The rate at which work is performed is determined by

A

The pump and actuator

198
Q

When Flo becomes turbulent in a pipe friction varies as

A

The square of the velocity

199
Q

Work is done whenever a force or push is

A

Exerted through a distance

200
Q

Because 1 gallon per minute of flow at one psi equals .000583 hp the total horsepower for any condition marks as

A

Horsepower equals gallons per minute times PSI times 0.000583

201
Q

In the process of designing a simple hydraulic system, the first step should be

A

To select an actuator

202
Q

To find the volume a cylinder will hold you must use this equation

A

Piston area times the stroke length

203
Q

The turns ratio formula in transformers is

A

E1/E2=T1/T2

204
Q

To find the secondary voltage or current given the primary windings specs you must use this formula

A

E2 x I2 = E1 x I1

205
Q

Current transformers are instrument transformers used to

A

Step current down

206
Q

The secondary terminal of a potential transformer should never be _________ to remove the device it operates from service

A

Short circuited

207
Q

The secondary of a current transformer should never be _________ to remove the device it operates from

A

Opened

208
Q

Transformers only having one winding are called

A

Autotransformers

209
Q

In the core type transformer a section of both the primary and secondary windings are

A

Wound on each of the core

210
Q

Hysteresis can be explained as

A

Friction of the molecules due to AC

211
Q

True or false : iron losses occur in a transformer whenever the primary is energized , even though no load is on the secondary winding

A

True

212
Q

The rating of a transformer is usually given in VA, KVA, or MVA

A

All of the above

213
Q

Conservator systems are used on OCB transformers to

A

Preserve the dielectric strength of the transformer oil

214
Q

A Hydrodynamic device uses kinetic energy rather than

A

Pressure

215
Q

A hydrostatic device uses

A

Potential energy energy by pressure

216
Q

The psi by height in feet is called

A

Feet of head of the column of water

217
Q

A mercury barometer has the weight of the column of mercury with a perfect_____ at the top

A

Vacuum

218
Q

Flow rate is the measure of volume of fluid, passing a point in a given time and can be measured by

A

Velocity

219
Q

The flow rate and speed is a formula of

A

Gallons per minute equals cubed, inches divided by minutes

220
Q

Laminar flow is

A

When particles of fluid move through a pipe in a street parallel flow path

221
Q

Flow resistance or abrupt changes in cross-section upset the laminar flow and caused it to become

A

Turbulent

222
Q

Verni’s principal states that if _______ is constant, the sum of kinetic energy and depress energy at various points in the system must be constant

A

Flow rate

223
Q

In a hydraulic symbol, this is used to describe what carries fluid that is used to control the operation of a valve or other components

A

A pilot or sensing line it is written in long dashes

224
Q

In hydraulic symbols, a motor is depicted as

A

A circle with a triangle pointing inward

225
Q

Connecting lines are drawn to the bottom of the reservoir symbol when the lines

A

Terminate below the fluid level in the tank

226
Q

What are the 4 primary purposes of hydraulic fluid systems

A

Cooling, lubricate, seal, transmission

227
Q

In additional purposes of hydraulic fluid it must

A

Be compatible with compatible materials such as seals and hose interior linings

228
Q

Other than sizes of clearances and pressure drop across the clearances what determines the leakage rate in a hydraulic system

A

The operating viscosity of the fluid

229
Q

The viscosity of a fluid is defined as

A

Resistance to flow

230
Q

Absolute viscosity is defined as

A

Resistance encountered when moving on layer of liquid over another

231
Q

Kinematic viscosity is

A

The most common way way of measuring viscosity

232
Q

Viscosity index is

A

A dimensionless number that characterizes the variation of viscosity of a fluid with variations of a temperature

233
Q

Pour point is

A

Is the lowest temperature at which a fluid will flow

234
Q

What is not a catalyst of oxidation pressure, water, agitation, or acids

A

Acid is not a catalyst for oxidation

235
Q

These are additives that aid the fluid in the rejection of water

A

Demulsifiers

236
Q

High specific gravity fluids used in a pump may be more critical in

A

Causing pump cavitation

237
Q

Fire resistant oils are made up of

A

Water bases, and synthetics

238
Q

Phosphate Esther attack

A

Elastomers some paints and plastic

239
Q

The advantages of synthetic fluids are

A

Oxidation resistance, and high temperature operating characteristics

240
Q

Pipe and pipe fittings are classified by ______ size and wall thickness

A

Nominal

241
Q

The schedule number for standard pipe sizes

A

Schedule 40

242
Q

One advantage of tubing over pipe is the ease of_____ to shape

A

Bending

243
Q

Tubing sizes designated by

A

The outside diameter

244
Q

Ceiling between sections of tubing is obtained by the use of various types of

A

Fittings

245
Q

This dynamic seal is installed in an annual groove machine into one of the meeting parts

A

This is an O-ring

246
Q

Lip type seals are used principally on these types of shafts

A

Rotating shafts

247
Q

A rubber like material that contains no natural rubber is called a

A

Synthetic rubber or elastomer

248
Q

This elastomer is a wide we use seal material in modern hydraulic systems and is inexpensive

A

Nitrile or Buna-N

249
Q

Nitrile has a reasonably wide temperature range, which is

A

-40°F to 250°F

250
Q

One of the several ways to reduce leakage is with the usage of

A

Mounted valves

251
Q

Back mounting prefers to panel type installations where pipe or tubing is

A

Connected to sub plates

252
Q

At two high temperature, a seal may ______ or swell

A

Soften

253
Q

After installation, a seal began to wear quickly and leak, which meant it was probably not_______ before installation

A

Lubricated

254
Q

The filler hole and a reservoir is provided with a

A

Opening that has a removable screen

255
Q

A plate that prevents returning fluid from directly entering the pump inlet in a reservoir is called a

A

Baffle

256
Q

Connections made on top of the reservoir often set______ to keep them above dirt and other contaminants

A

Risers

257
Q

Lines that terminate near the tank bottom and are not equipped with strainers should be cut_________ prevent the line opening from bottoming in the tank and cutting off flow

A

A 45° angle

258
Q

What is not one of the three most common standard reservoir, designs, flat top, L shaped, overhead stack, or wedge

A

Wedge is not one of the three most common standard reservoir designs

259
Q

A modification on a reservoir to provide a reserve against unexpected demands on system capacity is

A

To size the reservoir for at least 20% over capacity

260
Q

Fluids in a reservoir with a low viscosity index should be

A

Kept warm by heaters or heat exchangers

261
Q

Reservoir temperature is controlled by

A

Heaters, air, coolers, and water coolers

262
Q

Sources of contamination in a hydraulic system, R

A

Built-in contamination, ingress, contamination, and internally generated contamination 

263
Q

Which of the following is not a mechanism of wear in hydraulic systems :adhesion ,filtration, fatigue ,cavitation

A

Filtration is not a mechanism of

264
Q

A particle one micron in size equals______ inches

A

39 millionth of an inch

265
Q

The smallest particle and I can see is approximately

A

40 µm

266
Q

A contamination blockage which prevents the solenoid spool from shifting is called a

A

Transient failure

267
Q

Hydraulic circuit components fail as a result of contamination and

A

Design

268
Q

When sampling a hydraulic system the preferred location for sampling is directly _____ of the return line filter element

A

Upstream

269
Q

To monitor initial and subsequent levels of contamination these points must be provided

A

Sample points must be provided

270
Q

There are three areas hydraulic systems for locating a contamination control device

A

The pressure, return line, filter

271
Q

The tubing must not be welded or

A

Brazed

272
Q

When transferring clean oil the oil transfer pump must be equipped with a

A

5 micron filter

273
Q

The term full flow applied to a filter means

A

That all the flow generated by the system passes through the filtering element

274
Q

A coarse filter is referred to as a

A

Filter

275
Q

The higher the mech or sieve number

A

The finer the screen

276
Q

An increase in pressure difference across a filter will cause a

A

Increase in power consumption

277
Q

To test for material compatibility with a filter element it is

A

Immersed for 72 hours in system fluid

278
Q

When specifying the correct filter for a given application which of the following would not be considered

A

Flow sampling method

279
Q

There are two basic classification of filtering materials and they are

A

Absorbent and adsorbent

280
Q

What type of filter element provides precise control of pore size

A

Surface media

281
Q

What is used to support the media again pressure differential in filters

A

Cylindrical perforated tubes

282
Q

Hydraulic filter elements for fine filtration requirements are most frequently made of

A

Glass fiber material and also tend to have a pleated structure

283
Q

This type of valve is incorporated into the housing to eliminate the possibility of element collapse or rupture in filters

A

A bypass valve

284
Q

A filter designed to signal the operator when the element needs to be cleaned is a

A

Indicating filter

285
Q

The double acting cylinder returns and extends by

A

Hydraulic pressure

286
Q

Speed of cylinder formula

A

Gpm x (231/effective piston area)

287
Q

Force of cylinder formula

A

Force = PSI x in^2

288
Q

Pressure of a cylinder formula

A

PSI = force(lbs) / piston area (in^2)

289
Q

Displacement in hydraulic actuators is

A

The amount of fluid required to turn the motor output shaft one revolution

290
Q

Torque rate in a motor formula =

A

Torque load(lb-in)/desired operating psi x0.01

291
Q

Which motor is Not classified by application

A

HSLT, LSHT , torque actuators , or LMPG

292
Q

Internal gear motors fall into two categories

A

Direct drive gerotor and orbiting gerotor

293
Q

Balnced motors vanes are held against the cam ring by

A

System pressure

294
Q

In vane motors inlet fluid is also ported under the vanes so as to

A

Balance the pressure between the top and bottom

295
Q

Devices which usually cannot rotate continuously in one direction are

A

( both a and c) torque generator and actuator

296
Q

Torque is proportional to the area of the pistons and is a function of the angular relationship at wich

A

The swash plate is positioned

297
Q

Motor displacement is varied in response to workload changes by

A

The compensator control

298
Q

A hydraulic motor that rotates less than a full revolution is sometimes called

A

A limited rotation actuator

299
Q

This valves control the direction of fluid flow

A

Directional valves

300
Q

These valves direct the fluid by opening and closing flow paths in discrete valve spool positions

A

Definite position directional finite valves

301
Q

This valve allows free flow in one direction and blocks flow in the other direction

A

Check valve

302
Q

A heavy spring check valve is usually correlated as a

A

Relief valve

303
Q

This valve is normally offset to one extreme position by a spring , it has one actuator that shifts the spool to the other extreme position

A

Two position spring offset

304
Q

Directional valves are not

A

Actuators

305
Q

Directional control valves may be shifted

A

All of the above

306
Q

The pilot pressure on a two stage valve may be supplied by

A

An internal or external passage

307
Q

To control the shift speed of the main spool on a two stage valve

A

A pilot choke may be incorporated

308
Q

To increase the shifting speed on a two stage valve a

A

Pilot piston can be used

309
Q

A simple method on a two stage valve of flow control that restricts the distance the main spool can shift is

A

A spool stroke limiter

310
Q

Line mounted versions of spool stroke limiters are more frequently found in 

A

Mobile applications

311
Q

A typical deceleration valve application is

A

Too slow a drill, head from fast advance to feed speed

312
Q

This valve loses control in reverse flow rate that is permitted by the integral check valve

A

A tapered, plunger design deceleration valve

313
Q

What type of deceleration valve allows the load to creep?

A

A window or fist valve

314
Q

In a prefall valve, what pushes the fluid through the valve?

A

Atmospheric pressure or gravity

315
Q

Decompression valves are offered as an integral part of of the pre-fill valve that

A

Prevent possible damage from hydraulic shock

316
Q

A relief valve is normally closed or normally opened

A

Normally closed

317
Q

What is a relief valves purpose?

A

To limit pressure in the system to a preset maximum

318
Q

The pressure at which the valve first begins to divert flow is called the

A

Cracking pressure

319
Q

The difference between cracking pressure and full flow pressure is sometimes called

A

Pressure override

320
Q

The event connection to the chamber above the piston vents to

A

The tank

321
Q

To use the same valve as an unloading valve you need

A

Back pressure

322
Q

A back pressure valve operates in

A

Balance

323
Q

A sequence valve is used to cause actions to take place in a system in

A

A definite order

324
Q

If a sequence valve is installed downstream in a cylinder line , it must have a

A

Check valve to allow free flow return

325
Q

The pressure setting in a counterbalance valve is slightly higher than

A

Is required to hold the load from falling

326
Q

A brake valve is used in the exhaust line of a hydraulic motor to

A

Prevent over speeding and to prevent excessive pressure buildup when decelerating

327
Q

When the load is being accelerated, pressure is

A

Maximum at the motor inlet

328
Q

To control the flow when a load tends to run away the best approaches to

A

Utilize a meter out circuit

329
Q

A flow control valve purposes

A

To control the rate of flow

330
Q

A meter in circuit is

A

A circuit that controls the amount of fluid going into the actuator

331
Q

Another method of controlling flow that is installed in a branch circuit off the main line to control cylinder speed is

A

A bleed off circuit

332
Q

By adjusting the flow control on a bleed off circuit

A

The pump delivery is diverted to the reservoir and affects the cylinder speed

333
Q

On a bypass type for control the spring that keeps the bypass piston close is equivalent to

A

20 psi

334
Q

On a restricted type for control, a 20 psi spring holds the compensator spool and the normally_______ position

A

Open

335
Q

The use of any type of proportional valve requires that the equipment contain

A

Electrical power supply

336
Q

These type of valves are restricted type flow controls, and they are usually used in a meter out configuration

A

Deceleration valves

337
Q

Displacement in a hydraulic pump is the

A

Max or pressure capability output in GPM

338
Q

Displacement is expressed in

A

Cubic inches per revolution or CIR cubed

339
Q

Efficiency percentage in a hydraulic pump formula is

A

The efficiency percentage equals the actual output times 100 divided by the theoretical output

340
Q

Fix displacement pumps have a displacement that cannot be changed without

A

Replacing some internal components of the pump

341
Q

Because gear pumps have higher pressures at pump outlets, and lower pressures at pump inlet they referred to as

A

An unbalanced design

342
Q

Most fixed displacement vein pumps use

A

A balanced design

343
Q

On an intra-vein pump holes drilled through the rotor segments act as this purpose

A

Equalize pressure above and below

344
Q

An axial piston pumps, the pistons reciprocate_____ to the axis of rotation of the cylinder block

A

Parallel

345
Q

On a bent axis piston pump, the connection from the driveshaft to the cylinder block causes

A

A angle

346
Q

On in-line piston pumps, the pistons fitted to boards in the cylinder block are connected through

A

Piston shoes

347
Q

Accumulators provide a way to store fluids

A

Under pressure

348
Q

The energy storage capability also makes accumulators capable of acting as

A

Shock absorber

349
Q

A weight loaded accumulator is the only type of accumulator where pressure is______ whether the chamber is full or nearly empty

A

Constant

350
Q

The most commonly used gas in a gas charged accumulator is

A

Nitrogen

351
Q

The pre-charge on a gas charge accumulator should never be less than

A

1/4 of the maximum working pressure

352
Q

An intensifier on a cylinder is a device used to

A

Multiply pressure

353
Q

A push rod operates two electrical switches by

A

Using a plunger to press both electricals switches

354
Q

Two principal types of pressure gauges are

A

The Borden tube and the Schrader type

355
Q

Vacuum gauges are calibrated in

A

Inches of mercury

356
Q

The purpose of a snubber on gauges are

A

To prevent the gauge from oscillating and protects it from pressure surges

357
Q

Name all types of chemical hazards

A

Flammable, explosive, toxic, and corrosive

358
Q

The four main types of hazards are

A

Electrical, chemical, mechanical, and environmental

359
Q

Most common work place injuries are

A

Back injuries

360
Q

An example of a contact by accident is

A

A splash from a chemical

361
Q

When encountering a chemical spill only pick it up if

A

You are trained to handle it

362
Q

If you see a way to make your job safer you should tell your

A

Supervisor

363
Q

OSHA’s hazard communication standard states about flammable chemicals

A

Chemical manufacturers and distributors to classify chemicals that are flammable

364
Q

The purpose of the EPA

A

Control chemicals in the environment

365
Q

Chemical glove manufactures test gloves extensively to show

A

Which gloves protect against with chemicals

366
Q

The best eye protection better than safety glasses are

A

Safety goggles

367
Q

The second kind of atmosphere supplying respirator is

A

SCBA self contained breathing apparatus

368
Q

Which of the following is the responsibility of an employee

A

Identifying ppe to be worn on the job

369
Q

While using mechanical tools or rotary tools you must not wear

A

Gloves

370
Q

While using an electrical tool if a short circuit occurs what becomes part of the circuit

A

The handle or casing

371
Q

Before you disconnect a pneumatic tool you must first

A

Relieve the pressure

372
Q

Before you disconnect a pneumatic tool you must first

A

Relieve the pressure

373
Q

To use a forklift you must be

A

OSHA certified

374
Q

Under what conditions is it safe to stand under a load

A

Never

375
Q

The fixed guard opening can be as large as 6 in if

A

It’s more that 3ft from the operation

376
Q

If the machine is equipped with presence sensing guards

A

There is no physical barrier between the operator and danger zone

377
Q

In tagout osha requires that tags should never be

A

Bypassed or ignored

378
Q

Potential difference is measured in

A

Volts

379
Q

I’m a properly wired 120 v circuit the hot wire is ______ and the neutral is_____

A

Generally black or red, white or gray

380
Q

If you touch someone who is in contact with an electrical source you will

A

Also become part of the circuit

381
Q

The most common method of preventing the accumulation of static electricity is

A

Grounding

382
Q

Fuses and circuit breakers are designed to act as ______ to prevent them from overloading

A

Safety valves

383
Q

If the unexpected start up of equipment is likely to danger people, power to the equipment must be

A

Locked out

384
Q

In a fire pyramid these three elements will give you a chain reaction

A

Oxygen, fuel , heat

385
Q

A class B fire are of flammable or combustible

A

Liquids and gasses

386
Q

Water puts out fire by

A

Reducing the temperature of the fuel

387
Q

After using this type of fire extinguisher it must be turned in for refilling

A

Pump tank water

388
Q

Ultraviolet radiation from welding can

A

Damage the eyes as well as produce a burn similar to sunburn

389
Q

One of the most important safety concerns for workers in confined spaces is the

A

Atmosphere within the space

390
Q

The warning signs of heatstroke are

A

Hot and dry skin , severe headache, rapidly rising temperature, fainting

3rd Sixth Month (1 decks)

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