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Electrical > Book #3 > Flashcards

Book #3 Flashcards

1
Q

When installing a switched receptacle in a residential bedroom, what must be done so the receptacle can also be counted as a wall outlet?

A

Constant power on the top socket

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2
Q

When the liquid level is down in a battery, what type of liquid do you add?

A

Distilled water

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3
Q

On a single-phase split-phase induction motor, the centrifugal switch disconnects the start winding from the circuit at what percentage of the full speed of the motor

A

75%

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4
Q

What characteristics will a capacitor-start motor have?

A

Low inrush current and high starting torque

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5
Q

In a DC circuit, Voltage and Current are:

A

Directly proportional

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6
Q

Where do you find the maximum amount of area a smoke detector covers?

A

The manufacturer

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7
Q

During a routine maintenance check of a wye connected 3-phase motor, you discover when you take individual amp reading of each phase that one phase is drawing 7 amps more than the other. what is the probable cause

A

Shorted winding

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8
Q

What is the main reason for lubricating bearings in a motor?

A

Reduce heating

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9
Q

What is the proper procedure to follow when energizing an oil-filled transformer for the first time?

A

Open the secondary and energize the primary

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10
Q

When wiring a control system, how shall normally closed devices be wired?

A

in series

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11
Q

What is the installation requirements for single conductor mineral-insulated cables carrying over 425A?

A

Grouped together to minimize induced sheath currents

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12
Q

Most AC voltmeters and ammeters are calibrated in?

A

Root-means-square values

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13
Q

The hypotenuse of the power triangle represents:

A

Apparent power

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14
Q

The primary purpose of a megger is to measure:

A

Resistance

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15
Q

A Split-phase AC motor is made self starting by the addition of:

A

Starting winding

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16
Q

The primary of a current transformer is always connected in:

A

Parallel with the load

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17
Q

The primary hazards when handling and charging batteries is/are due to the danger of

A

Acid burns and explosions

18
Q

“Trip-free” as applied to electrical terms means:

A

Mechanism which makes it impossible to hold contact close against overload

19
Q

A motor can be operated as a generator when the motor needs to be slowed or stopped quickly. what is this type of DC motor control called?

A

Dynamic Braking

20
Q

The purpose of electrical interlocks in a reversing magnetic starter are:

A

To prevent mote than one coil from being energized at the same time

21
Q

Limit switches are usually used to limit:

A

Travel

22
Q

A dual voltage single phase motor must have:

A

Two running windings

23
Q

A dual voltage AC motor operating on the higher voltage will draw:

A

Less current than on the lower voltage

24
Q

A single phase motor has a phase to ground fault, a possible cause is:

A

The centrifugal switch is touching the frame

25
Q

Solid-state inverters are used to:

A

Change DC to AC

26
Q

AC squirrel-cage induction motors can have their speed controlled through electronic equipment that controls the?

A

Frequency

27
Q

The part of an AC to DC power supply that keeps the output voltage constant despite load changes in current is the:

A

Voltage regulator

28
Q

How is the circuit of a loaded voltage divider connected?

A

Series parallel

unloaded = series

29
Q

Which type of switch is installed to only separate the circuit from its source of supply and should never be opened or closed under load?

A

Isolating switch

30
Q

When replacing a shackle pin on a hydraulic bender, why shouldn’t you use a threaded bolt

A

Bolt may not be strong enough

31
Q

A growler cannot locate which of the following faults in a motor winding

A

Reverse Coils

32
Q

W.H.I.M.I.S is an abbreviation for?

A

Workplace hazardous materials information system

33
Q

M.S.D.S is an abbreviation for:

A

Material Safety Data Sheets

34
Q

What is required for personnel to work in an area where chemicals are in use?

A

WHIMIS qualification and availability of MSDS information

35
Q

According to WHIMIS classification, control products are divided into how many classes?

A

6

36
Q

When you transfer hazardous materials to another container, you must:

A

Create a workplace label and affix it to the new container

37
Q

If you are exposed continuously to a toxic material:

A

You may not be have a health problem for several years

38
Q

When chemicals arrive on site, what needs to be done with the MSDS sheet?

A

WHIMIS folder in the general office on site

39
Q

How long is MSDS valid for?

A

3 years

40
Q

What are the two types of labels prescribed by WHIMIS

A

Workplace label and supplier label

41
Q

Battery acid is an example of:

A

Class E: corrosive materials

Electrical (13 decks)

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