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Electrical > Book #8 > Flashcards

Book #8 Flashcards

1
Q

Solid state devices:

A

Can be provided with an integral disconnect

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2
Q

When can a final inspection by the inspection department be done on the electrical installation in a single dwelling?

A

After the electrical installation has been completed

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3
Q

What is the top layer involved with a thermit weld?

A

Magnesium filings

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4
Q

To whom do you report an unsafe condition on a construction site?

A

Your supervisor

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5
Q

Which operation will a punch down tool perform?

A

cut and terminate

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6
Q

Which undesirable condition may result from encircling metal-covered single conductor cables with support made of ferrous materials?

A

Reduce conductor capacity

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7
Q

What would be used to check an element for an open condition in an energized electric hot water furnace?

A

Clamp-on ammeter

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8
Q

What are the two precents to remember when doing open delta calculations?

A

57.7% and 86.6%

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9
Q

A fuse has the following stamped on the body of the fuse, “2000a 600v HRCI-MISC, 20 kaic. what does the 20 kaic stand for?

A

Kilo-amps of interrupting capacity

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10
Q

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

A

WHMIS qualification and availability of MSDS information

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11
Q

When should rough-in wiring on any new single dwelling installation commerce?

A

After the walls and roof are installed

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12
Q

What type of drawing would show all the major components of a building’s electrical system

A

Single line

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13
Q

When connecting a residential extra-low voltage thermostat, what does the R terminal designate?

A

Transformer

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14
Q

Which type of split-phase motor would most efficiently drive an air compressor?

A

Capacitor starting

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15
Q

Which DC motor has the highest starting torque?

A

Series

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16
Q

An Ac induction motor is required to have dynamic braking, how would this be done?

A

Applying DC to the stator

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17
Q

Copper welding by the thermit process is permitted to be performed in:

A

Dry locations

18
Q

What is the primary purpose of skirting on a high voltage semi-con stress cone?

A

Minimize corona build up

19
Q

What is the function of a triac lamp dimmer

A

It varies the voltage cycle across each lamp

20
Q

What do you require to operate a powder actuated tool?

A

Certificate

21
Q

When installing a PLC system, how do you test your inputs and outputs?

A

Energize inputs and outputs one by one

22
Q

When C phase on a ground fault indicating system is shorted to ground, how will the ground detection device lights indicate the presence of a ground fault?

A

Two bright, one dark

23
Q

What is prevented by installing a heat shrink material over high voltage underground splice?

A

Moisture penetration

24
Q

What is the most important consideration when disconnecting a meter from an energized current transformer?

A

CT secondary must be short-circuited

25
Q

Why is high voltage cable shielded

A

To prevent corona build-up

26
Q

A circuit is thought to have a problem with harmonic distortion. which test instrument should be used to confirm the problem?

A

A digital ammeter and a digital voltmeter

27
Q

What would cause a Class A ground fault circuit breaker to trip and disconnect supply to a circuit?

A

Overload, short circuit, and ground fault

28
Q

When doing welds for a ground grid, what is placed at the top of the thermit weld mould?

A

Ignition powder

29
Q

What happens to a squirrel cage motors slip and torque as a load is added?

A

Torque goes up, slip goes up

30
Q

A DC motor obtains its supply from a half wave rectifier and a solid-state starter. if one diode of the rectifier opens, what will happen to the motor?

A

The motor would stop

31
Q

If an analog DC voltmeter deflects in the wrong direction, the probable cause is:

A

Reversed polarity

32
Q

How are sheath currents prevented on a 26.6kv high voltage cable?

A

drain one end and isolate the other

33
Q

What is the term for the voltage produced in a photocell, module or an array of solar cells?

A

Photovoltaic

34
Q

What is the function of the condenser in an air-conditioning unit?

A

Transfer heat to the outside

35
Q

What is the function of the Furnace in an air-conditioning unit?

A

Transfer heat to the inside

36
Q

What pumps refrigerant through the system on an air-conditioning unit?

A

Compressor

37
Q

What transfers cold to the inside of an air-conditioning unit?

A

Evaporator

38
Q

An apprentice wants more complex work, what shall you do?

A

Work with the apprentice, to assist you with more complex work

39
Q

What shall be included in the job specifications?

A

Completion date

40
Q

What should be used to clean DC machine Brushes?

A

Sandpaper

Electrical (13 decks)

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