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Apprentice > Step 6 > Flashcards

Step 6 Flashcards

1
Q

Why is the square root of 2 (1.414) important to remember?

A

For rigging vectors.

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2
Q

What is the difference between a switched and fixed capacitor bank?

A

Switched capacitors banks can be energized on a given schedule determined by :time ,temp,load, voltage, or other.

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3
Q

What is pass to neutral voltage of 12,460 volt feeder?

A

7,200 V.

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4
Q

Can an apprentice hold a steward position on the job.

A

No

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5
Q

3 items to check on a mac jumper

A
  1. Current carrying capacity
  2. Condition of insulation
  3. Condition & size of the connectors on the jumper, for good mechanical use
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6
Q

What is the rated secondary voltage of transformer needed to produce three phase 120/208 V

A

120V

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7
Q

List steps necessary to properly phase the secondary of two 480V three phase bank

A
  1. Check relative polarity
  2. connect the high side of the second bank and energize
  3. Connect one secondary leads to the common point and with a voltmeter check the other conductor.
  4. A zero reading on the voltmeter will allow the banks to be connected.
  5. GR’s
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8
Q

Define impedance.

A

The total opposition to the flow of current in an AC circuit

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9
Q

Explain how to test a transformer for additive or subtractive polarity>

A

Connect 120 on h1 & h2, put a jumper on h1 to x1,put a voltmeter from h2 to x2 if it reads more its additive if it reads less than applied voltage then its subtractive.

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10
Q

In relationship to the load where is the optimum location to hang a capacitor bank.

A

As close to the load as possible.

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11
Q

Explain how to load check 3 phase transformer bank

A

by using a amp meter

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12
Q

Can you work bonding on a 33 KV circuit with rubber gloves.

A

No

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13
Q

Before any work is to be done with rubber gloves a complete tailboard will to insure that all personal are aware of the work and associated hazards.

A

True

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14
Q

It shall be mandatory that sleeves of the same voltage rating as the rubber gloves to be worn when working on energized conductor of apparatus above 7,500V Phase to phase

A

True

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15
Q

What is the purpose of disconnect switch?

A

To isolate a line or apparatus form an energized circuit.

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16
Q

What is the function of an automatic recloser?

A

To interrupt and reclose on a circuit automatically to clear transient faults

17
Q

What is the safe working distance from conductors energized at?

A

7,500-15,000 V 2’1”

15,000-35,000 V 2’4”

18
Q

While live line work is in progress no other work of any nature shall be performed?

A

True

19
Q

What is the maximum resistance a ground should have?

A

25 ohms

20
Q

Why is semi-conductor used on underground cable?

A

To equalize stress on the cable insulation

21
Q

You are going to parallel two circuits of the same voltage feeding from the same substation what must you do to any regulators on the line?

A

The regulators must be placed on neutral and locked out.

22
Q

How much clearance is required between guys and conductors supported on the same pole?

A

120/240 3”
4KV 6”
12KV 9”

23
Q

If the neutral of a 4 wire 12KV circuit was broken or disconnected why precaution would you thane when making repair?

A

Treat as a 12KV primary phase, mac it out using hot sticks then either work it with hot sticks or tubber gloves.

24
Q

Explain the procedures for replacing a broken 12KV insulator on a bonded arm with circuit energized

A

you place cover where needed and you cut the bond from the insulator and change out the insulator

25
Q

What is the propose of a pilot wire?

A

Circuit protection and street light circuit

26
Q

Can a Foreman work when energized work is being performed 600V or more by members of his/her crew?

A

NO

27
Q

Explain how to take a clearance on a line?

A

you call systems and ask them to give you clearance on the line you want and place your tag on it

28
Q

List three conditions that would cause induced voltage on a line?

A
  1. Wind static
  2. Lightning strike
  3. Transmission lines
29
Q

On a three phase, 4 wire delta secondary (240) volts, the voltage taken from each phase to neutral would be

A

120V, 120V, 208V

30
Q

Can 400 Amps of current be dropped on a 400 Amps KPF switch?

A

No

31
Q

A 500 KVA transformer has a primary voltage rating of 7,200V a secondary voltage of 240V

A

I=KVA1,000/E
1. I=50,000/7,200 =6.94 full load primary current
I=KVA1,000/240
2. I=50,000/240 =208.33 Amps full load secondary current

32
Q

A 2,500 KVA transformer bankis connected to 13.2 KV feeder what will be the feeder current with the transformer fully loaded?

A

I= KVA1,000/1.73E

I=2,5001,000/1.7313,200 =109.48 Amps

32
Q

Precautions taken before work on confined space

A

Atmospheric test, ventilation, heat scanner check

33
Q

In a confined space

A

Employee present, traffic control, warning devises

Apprentice (9 decks)

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