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4th Ste > Test In > Flashcards

Test In Flashcards

1
Q

How would you set the regulator for paralleling inside the feed point ?

A

Set regulator to neutral and off control.

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2
Q

In the first step of returning a voltage regulator to service, what is the position of the Power and Control switches?

A

Off

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3
Q

When bypassing a control regulator, the control is set to ______ and off control.

A

Neutral

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4
Q

What does it means when voltage regulators is set to Buck?

A

The voltage regulator provides a step down in voltage

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5
Q

The system is 6930/12000 WYE 4-wire and the transformer 12000 GRD WYE/6930. How would this transformer be connected?

A

Phase to Neutral

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6
Q

The system is 2400/4160 WYE 4-wire. The transformer is 2400/4160 WYE. How is the primary connected?

A

WYE

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7
Q

A customer wants 120/208 volts , three-face, four-wire service. The overhead transformers are 120/240 volts. What bushing would be the common?

A

X2

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8
Q

A customer wants 120/208 volts, three-face, four-wire service. Transformer are 120/240 volts. What is the secondary connection?

A

WYE

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9
Q

To build a WYE, we wire the three windings together by ______ of the connections.

A

Matching the polarity.

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10
Q

Which of the following rotations is the standard SCE face sequence?

A

BAC, CBA

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11
Q

A vector is define as a means of expressing the _______ and the _______ of a quantity.

A

Magnitude , Angle.

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12
Q

What are the three reasons that could cause an Automatic Recloser (AR) to open a ground relay target?
Select the three that apply.

A

•Bypass around AR
•Paralleling with another circuit
•Ground fault

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13
Q

Which of the following statements best describes how RARs operate during Red flag warning situations

A

RARs are Blocked to prevent reclosing in SOB 322 areas.

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14
Q

The function of the ground relay is to determine the circuit’s

A

Escaping current

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15
Q

What are the three primary reasons Edison installs Automatic Reclosers (AR’s)?

A

•sectionalizing
•protection
•changing mode operation

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16
Q

What is the primary function of a midpoint controlled switch?

A

To aid in sectionalizing the total circuit load to about 50%

17
Q

What components are required for each PE gear installation?
Select the three that applied

A

•Control mechanism
•Voltage sensing units
•Transfer mechanism

18
Q

An AC circuit has 120 volts and 10 ohms of impedance. What is the current on the circuit?

A

12 Amps

19
Q

A circuit has 17KVA with a power factor of 82.3% what is the KVAR?

A

9.7 KVAR

20
Q

Which of the following may occur if the secondary of a current transformer is opened while primary is in the current of the primary of the current transformer?
Select the two that applied

A

•High voltages across the opened secondary.
•Arcing could occur which could harm operator and cause equipment damage.

21
Q

On a CT meter panel, solid color wires with the white stipe are used for what?

A

Current Input.

22
Q

Which of the following transformers are needed for KWH meter to measure power?

A

Current and potential transformer

23
Q

What is used to shunt the CT before removing the meter in a CT panel

A

Test Switches

24
Q

What is the function of the Potential Transformer (PT)?

A

To provide a proportional output voltage for meter purposes

25
Q

What is the reason for performing high voltage testing when phasing conductor?

A

Ensures both lines are energized, and the tester is indicating properly.

26
Q

Which of the following best describes the operation of a ground bank when there’s no ground fault on the system?

A

The primary voltages are balance so there is no current flowing in the secondary

27
Q

How is the high side of a ground detector configured?

A

Three- single phase transformers connected WYE with WYE point grounded

28
Q

Which of the following are reasons for installing a ground bank?
Select two that apply.

A

•Provides source of ground on an ungrounded Delta system.
•Stabilized the neutral on a four-wire distribution circuit to protect customers from over voltage

29
Q

Which of the following best describes the time current characteristics of a fuse?

A

Arcing burns material surrounded the fuse and thus creates gases that blow out the arc and interrupt the fault current.

30
Q

How is the asymmetrical fault current determine?

A

Sum of the symmetrical current and the discharge current

31
Q

Which of the following are characteristics of an expulsion fuse compared to a current-limited fuse?
Three that apply

A

•Relatively expensive
•Expels hot gases, molten debris and by-products
•Lower interior rating

32
Q

What is the primary function of a fuse in on electric circuit?

A

To interrupt the electric current flow in the circuit when the current goes above the predetermined range.

4th Ste (1 decks)

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