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Apprentice > Step 7 > Flashcards

Step 7 Flashcards

1
Q

Define transformer

A

An electrical device that raises or lowers voltage depending on the costumers needs

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2
Q

Define Capacitor

A

A device that stores energy by means of electrostatic charge

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3
Q

Constant current Transformer (R.O.)

A

A transformer that automatically maintains a constant current in its secondary circuit under varying load

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4
Q

Multiple street lights are connected in _____

A

Parallel

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5
Q

Most accidents are caused by defective equipment

A

False

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6
Q

A 4160 volts or star circuit has a phase to voltage of ______

A

Formula: voltage/1.73

4160/1.73 = 2400

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7
Q

Working on transformers in parallel operations

A

Secondary side should be open first and closed last

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8
Q

Whats the maximum resistance a ground should have?

A

25 Ohms

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9
Q

what must be done to voltage regulators before 2 regulated circuits can be phased and tied together

A

They must be placed on neutral and locked out

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10
Q

Whats 2 purposes does oil in a transformer serve?

A
  1. Insulation

2. Cooling

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11
Q

What does KVAR mean

A

Kilo Volt Amper Reactance

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12
Q

All personal working on jobs that require the use of a helicopter will be briefed by the pilot and or supervisor as to their duties and safety precaution to be taken

A

True

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13
Q

A customer complains of flickering lights what are two probable cause?

A

1) . Loose connections

2) . Wires touching

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14
Q

When a line hose or rubber blanket is lowered from a pole it should be set aside anyplace out of the way.

A

False

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15
Q

What are three types of faults that occur most often

A

1) . Phase to phase
2) . Phase to ground / neutral
3) . Open

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16
Q

what precautions must be taken when connecting a current transformer?

A

Make sure grounds are off and secondary are connected

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17
Q

Bond wires shall be not less than ___ inches from metal braces.

A

1 1/2 inches

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18
Q

The difference between primary fuses marked “T”, “E” or “K” is the melting time of the links to open

A

True

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19
Q

The climbing space on a pole shall be maintained in the same position for a distance of no less than ____ feet vertically both above and below each conductor level through which it passes.

A

4

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20
Q

what must be done to the voltage regulators before two regulated circuits can be phased and tied together?

A

They must be placed on Neutral and locked out.

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21
Q

What is meant by the interrupting capacity of a breaker

A

The point at which it trips the maximum amperage it can carry

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22
Q

Shock is pressent in all cases of severe bleeding.

A

False

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23
Q

After reaching the victim of a pole top accident what is the first action to be taken?

A

Carefully clear vicim from energized equipment

24
Q

Rubber goods should be relied on for accidental contact only

A

True

25
Q

Compressions in a sleeve used to splice conductors are made.

A

Starting at the center and working outward

26
Q

What is meant by “Blocking Reclosures?

A

Same as one shot

27
Q

The minimum safe working distance from a 12,000 volt circuit is _____

A

2’1”

28
Q

A multiple street light can be connected to any convenient secondary of proper voltage and does not require its own transformer.

A

False

29
Q

Rubber goods should not be left on conductors overnight because

A

all of the above

30
Q

The worst enemy of a Hot Stick is

A

Moisture

31
Q

The strength of a pole is expressed as is

A

Class

32
Q

On a 12,460 volt grounded why system 7,200 volt transformer are connected ____

A

Phase to Neutral

33
Q

A three phase delta system has no grounds on it. One phase accidentally grounded. What happens?

A

Nothing

34
Q

Two transmission lines exist on the same tower. If one is energized and the other is switched out and de-energized the voltage induced

A

Could Kill you

35
Q

What is the total load on the block in the following diagram

A

14,340

36
Q

In an open (two transformer) three phase bank the secondary:

A

Must be connected delta

37
Q

URD defines what?

A

Underground Residential Distribution

38
Q

The grounding conductor on a portable tool is

A

Green

39
Q

A sagging chart is used to

A

Show initial sag and tensions for sag throughout a line where tension is used in all spans

40
Q

Transformer fuses protect equipment from what?

A

Surge on the line

41
Q

Briefly define back-feed

A

When power is feed from the secondary side to the primary

42
Q

If it should ever become necessary to open a common neutral in a common neutral system, what must be done?

A

Mack it out and work it hot

43
Q

Transformer tap changer

A

Raise and lower output voltage of a transformer

44
Q

A transformer with built in protection for overhead is called what type of transformer

A

CSP

45
Q

Before working on a capacitor bank you should?

A

Disconnect the bank from the source, wait 5 min, shunt out each capacitor and ground

46
Q

A fusitor is used to

A

Limit Current

47
Q

What is Osha

A

Occupational Safety and Health Administration (OSHA) is a federal organization that ensures safe and healthy working conditions

48
Q

When is a line considered De-energized

A

When its been tested and grounded

49
Q

Define climbing space (G.O.95)

A

An area reserved for the lineman to ascend and descend in a safe manner.

50
Q

What is the proper way of securing a 15 KV blanket

A

clothes -pins

51
Q

You ar operating the puller on a wire stringing job and the puller begins to drag down and you notice the rope is getting extremely tight what should you do

A

Hold the pull and communicate to see if it is stuck somewhere

52
Q

A sectionalizer must be used in conjunction with what electrical apparatus

A

Automatic reclouser

53
Q

Two 10 KVA transformers are in parallel operation and you get a trouble call because on unit is smoking. When you arrive both units are still working. One unit is boiling and the other is cool. The connected load does not exceed the 20 KVA capacity of the two units. What are two possible problems?

A
  1. ) Oil is low

2. ) the impedance values are off

54
Q

If you suspect a fracture of the lower leg what part do you keep from moving

A

the whole leg

55
Q

Rubber goods should be relied on for accidental contact only.

A

True

56
Q

The conductor you put rubber goods on first is

A

Conductor nearest you

57
Q

you are working on a line crew when an accident occurs the foreman sends you to summon help who should you call and what info should you give them?

A 
Call 911
Let them know my 
Name 
location
status on injured personal 
what first aid has been given 
if a helicopter can land

Apprentice (9 decks)

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