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5th Month Final > Motor Control > Flashcards

Motor Control Flashcards

1
Q

What is the least number of rollers you should use under a load on a skid?

A

3

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2
Q

If new equipment is damaged and shipment you should report it to the?

A

Carrier

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3
Q

What type of wrench should you use for tightening anchor bolts?

A

Torque

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4
Q

Which of the following determine the speed of response for the proximity limit switch using an oscillator in the output circuit

A

The oscillator frequency

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5
Q

What is a solenoid current and amps with the plunger in the close position

A

Sealed or holding current

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6
Q

What design features are improve with the oil immersed solenoid?

A

Heat dissipation and wear conditions are improve through the use of oil immersed Solenoids.

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7
Q

Name two important functions of the memory selection of the PLc processor?

A

Both A and B (remember info that processor may need to make decisions remembers the instruction given by the user telling the POC what to do)

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8
Q

In a given transformer the voltage is reduced from the primary to the secondary what is this transformer called

A

Step down transformer

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9
Q

How is the effective voltage applied to a motor using a solid-state reduce voltage starter controlled

A

Through controlling the conduction of the silicon controlled rectifiers

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10
Q

Under what conditions does a step in motor advance one step?

A

Each time the motor is the Deenergized

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11
Q

The term differential when referring to a pressure switch means

A

The term differential between the actuation and the re-actuation points

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12
Q

The two types of timers most frequently used in industrial machines are the synchronous motor driven and the solid state

A

True

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13
Q

Why do some systems require a back up battery power source for the processor memory

A

Enable the processor memory to maintain a program in the event that the main power sources lost

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14
Q

Why is the inverse time characteristic of a fuse important

A

It parallel’s the characteristics of Conductors motors transformers and other electrical apparatus

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15
Q

In the double solenoid operating valve what keeps the spool in a center position when both solenoids are Deenergized

A

The valves pool is kept in a center position by Springs located of each end of the valve

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16
Q

What is meant by regulation in a transformer

A

The difference between the no-load and full load voltage as a percent of full load voltage

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17
Q

Why is it that more than one set of overload relays are used in a multi speed motor starter

A

Due to the change in horsepower when the speed of a motor changes it is necessary to supply the two sets of overload for it adequate protection.

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18
Q

What characteristics is most important and the rubber coating of wire an extension cords

A

Flexibility

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19
Q

What is advantage of panel mounting a contact block

A

The mounting provide space for terminal block is installations

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20
Q

A liquid has a _ shape and _volume

A

Changeable, fixed

21
Q

Convection heat is the

A

Transfer of heat by Fluids

22
Q

The solvent_, should not be used for cleaning because it is highly flammable and irritate skin

A

Gasoline

23
Q

At room temperature carbon is chemically

A

Inert

24
Q

Answer: 23^7/_8in.x26^7/_8in

A
25
Q

Kilograms per cubic meter is a unit of metric measurement for

A

Density

26
Q

You can use lead sheet or plastic film for

A

Reducing vibration of pipes or ducks

27
Q

Fires involving electrical equipment and wiring are designated?

A

Class c

28
Q

Excess Noise on the electrical and tools often indicates

A

Carbon brush problems

29
Q

Machinability is a speed and ease which a metal

A

Can be cut on a machine tool

30
Q
A

Chemical composition steel

31
Q

The ratio of a Material density to the density of water is called a

A

Specific gravity

32
Q

Magnesium parts should be gas welded

A

Only in emergencies

33
Q

An alloy containing iron as a base metal is

A

Steel

34
Q

Malleable cast Iron is _ than white cast iron and has _ resistance to water then?

A

Softer, more

35
Q

Steels that are_generally have a_Content

A

Forged, low

36
Q

The most important element added to iron and making steel is

A

Carbon

37
Q

Which of the following should you use as a lubricant when machining zinc

A

Lard oil

38
Q

To avoid sharp bending and abrasion The eye of a fiber rope sling should include a

A

Thimble

39
Q

What is the way of a 36 foot American standard I beam designed 515×42. Nine? Use equation W times W/Ft times L

A

1544.4 lbs

C

40
Q

Which of the following identifications would be most likely to appear on the links of a chain suitable for overhead lifting

A

800

41
Q

The following factors all Affect Wire Rope strength. In which one is the d/d ratio important

A

Bending over a curved surface

42
Q

Which of the wire rope end fittings is the most efficient assuming all are prepared correctly

A

Speltered socket

43
Q

The height of a movable sectional MetalScaffold that measures 4 x 8’ at the base should not exceed

A

16

44
Q

When a rigger left a load a few inches then stops to see if the load drifts downword what is he checking

A

Hoist brakes

45
Q

When working with floor operated hoist and cranes you should make sure that

A

Obstructions can be cleared by the moving load

46
Q

The rated load capacity or capacity of an encased polyester sling is indicated by the

A

Color and of the cover

47
Q

If a sling leg is attached to a suspended load at an angle of less than 90° the horizontal force acting on the sling leg

A

Increases as the sling angle gets smaller

48
Q

To support a lever across machine tools

A

Gauge block

5th Month Final (1 decks)

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