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4TH Final > Developing electrical troubleshooting skills 210 > Flashcards

Developing electrical troubleshooting skills 210 Flashcards

1
Q

Cross referencing to the different location of limit switches in a diagram are provided by

A

Arrows next to the symbol line numbers

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2
Q

A control panel layout shows the

A

Physical arrangement of a components

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3
Q

A sequence of operation

A

Is used with an elementary diagram

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4
Q

Which part of an electrical schematic generally represents the hot conductor?

A

Left vertical line

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5
Q

Which of the following is not typically used to identify conductors in a motor-control circuit?

A

Colors

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6
Q

The actual location and routing of circuits is shown on

A

Wiring diagram

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7
Q

In addition to the locations of lighting and lighting panels, lighting diagrams show the locations of

A

Telephone outiets

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8
Q

On architectural working drawings, an electrician is concerned mainly with the electrical drawings superimpose

A

Floor plan

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9
Q

Which of the following would show where the power-astribution system, ducts, and manholes are located for a manufacturing plant consisting of several buldings?

A

Plot plan

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10
Q

The following symbol represents an _______ outlet in a________

A

Exit light , wall

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11
Q

Which are most affected by overvoltage?

A

Slow speed motors

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12
Q

Maintained start-stop devices provide

A

only undervoltage release

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13
Q

Which of the following provides both overload protection and short-circuit protection in one unit?

A

Combination motor starter

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14
Q

If an electrical machine has several problems, you should correct _______ problem(s) before trying the mach

A

Only one

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15
Q

circuit that provides undervoltage release and has two wires connected to the pilot device that energizes

A

two-wire control

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16
Q

Overvoltage, excessive current and too-frequent operation are possible causes of

A

burned or short circuit magnet coil

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17
Q

When you arrive to troubleshoot a defective machine, the next thing to do after talking to the machine operator

A

Press the start button

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18
Q

In the electronic timing relay, the time-delay assembly is connected in

A

senes with the relay coil

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19
Q

When troubleshooting a starter, if line voltage is present, the problem is probably in the

A

Pilot circuit

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20
Q

The basic tools required for troubleshooting most control relays include a screwdriver, a voltmeter, and (a/an)

A

circuit tester. grounding

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21
Q

Most reversing starters with low-voltage remote pushbuttons are all of the following EXCEPT

A

mechanically interconnected

22
Q

Adding limit switches to the control circuit of a reversing motor provides

A

overtravel protection

23
Q

Changing the number of magnetic poles in the stator of a squirrel-cage motor permits the motor to run

A

at two or more fixed speeds

24
Q

For additional safety, most reversing starters are equipped with both an electrical and mechanical

A

interlock

25
Q

Which of the following kinds of starters is used to limit the starting torque on certain loads?

A

Autotransformer

26
Q

A good diode has a resistance that is

A

low in one direction, high in the other

27
Q

A latched electrical relay is an example of a

A

device that is stable in both the energized and de-energized conditions

28
Q

In autotransformer input circuits, each input line should be

A

fused

29
Q

The no-load current in a three-phase rectifier is typically 6 to 10% of the
______ current and usually

A

Full load

30
Q

A pneumatic shuttle valve is used for operating a conventional pneumatic ______
or electrical relay

A

Valve

31
Q

The kind of lubrication that should be used in a bearing is determined by the bearing’s

A

maximum operating temperature

32
Q

DC motors and generators have______ which cause special problems not normally found in ac mach

A

commutators and brushes

33
Q

Commutator overheating is sometimes caused by the direction of rotation of the motor being changed without changing the position of the brushes to the new ______ plane

A

neutral

34
Q

Worn and damage ball in roller bearings are easily detected by the _______ they produce

A

Unusual noise

35
Q

Motors that have been flooded with water usually can be savaged provided there’s no chemical or ______ were in

A

oils

36
Q

When testing a three phase delta connection wiring with a compass, the compass will indicate alternating north and south polls when the pole phase

A

Connected properly

37
Q

Which of the following is not a common cause of mechanical, vibration,

A

Worn Brushes

38
Q

All of the following are common reasons why a motor makes a noticeable noise when operating except

A

Too little end play

39
Q

You can measure the current in the leads of a three phase motor with a clamp on Ammeter the continuity with of the motor is tested with

A

ohmmeter

40
Q

When taking faults in a single phase split phase motor test, both the ______ windings for grounds opened in shorts

A

Run and start

41
Q

Play light maintenance primarily consist of______ to economize on labor ____ to optimize light levels in space appearance and _____ to correct the abnormalities in operations

A

Group Relamping , fixture cleaning, troubleshooting

42
Q

NEMA recommend seasoning liner lamps for ____ hr before dimming

A

12

43
Q

HID lamps require a____ and ____ period

A

Start up ; restrike

44
Q

The systemic testing of all controls in a building to ensure that they perform and interact properly is known as

A

commissioning

45
Q

The color temperature of a light produced by a lamp is expressed in degrees

A

Kelvin

46
Q

When preparing an elementary diagram, you should number all lines with_____ numbers

A

consecutive

47
Q

One of the best ways to leam about new equipment is to begin troubleshooting

A

before installation

48
Q

A sequence of operation consists of two elements: a log and a

A

Graph

49
Q

Most equipment manufacturers adhere to some kind of standard for electrical prints and symbols; the most widely used is the one proposed by

A

JIC

50
Q

Whenever equipment undergoes circuit changes and/or modifications, make sure that you record the information

A

On the schematic

4TH Final (7 decks)

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