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Test Prep > General Knowledge > Flashcards

General Knowledge Flashcards

1
Q

Explain what backfeed is?

A

Voltage supplied from load side

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2
Q

3 things that must be checked when given a pair of rubber gloves?

A

Voltage rating
Inspection
Test date

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3
Q

What is the purpose of a stress cone?

A

To prevent voltage stress at semi con edge, spread stress out across larger area

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4
Q

Explain the process of properly using phasing sticks?

A

-Verify both circuits are energized
- verify phasing equipment works properly
- phase across open

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5
Q

What is the purpose of static/shield wire?

A

To protect system below by attracting lightning to itself.

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6
Q

What could happen if grounds were removed from a single bushing TX?

A

TX case could become energized to full phase voltage

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7
Q

Explain the purpose of concentric wire?

A

Reduces/ spreads out voltage stress that leaks through insulation. Acts as a neutral returning unbalanced load back to source

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8
Q

What’s the advantage to a Y secondary connection ?

A

1). More efficient
2). Balanced load

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9
Q

What is the purpose of an iron core within a TX?

A

To direct and channel magnetic field

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10
Q

Class 4 rubber gloves (color ID and max use voltage)

A

Orange
36,000

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11
Q

Class 3 rubber gloves (color ID and max voltage use)

A

Green
26,500

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12
Q

Class 2 rubber gloves (color ID and max voltage use)

A

Yellow
17,000

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13
Q

Class 1 rubber gloves (color ID and max voltage use)

A

White
7,500v

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14
Q

Class 0 rubber gloves ( color ID and max voltage use)

A

Red
1000v

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15
Q

How often are rubber gloves tested?

A

Every 6 months

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16
Q

How often are rubber sleeves tested?

A

Annually

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17
Q

Class E hard hat voltage rating?

A

20,000v

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18
Q

What is power factor?

A

Ratio of true power to apparent power
KW:KVA

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19
Q

4 ways for cooling TX

A

Fins, fans, air, oil

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20
Q

3 type of capacitors

A

Time, temp, fixed

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21
Q

Carbon in transformer oil indicates what?

A

Arcing

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22
Q

3 parts of a rope

A

Fibers, yarns, strands

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23
Q

IBEW history
First president:______
Year formed:______
City formed in:_______

A

Henry Miller
1890
St. Louis

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24
Q

What is PCB?

A

Poly chlorinated biphenyl

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25
Q

How do you field test for polarity?

A

1) energize H1 at 120 V
2) Connect jumper from H1 to adjacent secondary bushing
3) Measure between H2 and it’s adjacent secondary bushing

If voltage is greater than 120 its additive, less than 120 its subtractive

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26
Q

What does SF6 stand for?
What does it do?

A

Silver-hexafloride
Dense arc snuffing gas

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27
Q

You can rubber glove a maximum of ___ volts phase to phase off the pole without an insulated platform

A

5 KV

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28
Q

How do you verify a pole is safe to climb?

A

Visual inspection
Sound test
Bore test

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29
Q

What is the purpose of armor rod?

A

Reinforce conductor
Reduce chafing

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30
Q

3 considerations when sagging conductor?

A

Temperature
Span length
Size of conductor

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31
Q

4 steps to grounding a line?

A

Identify
De-energize
Test
Ground

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32
Q

What is the speed of light?

A

186,282 miles per second

33
Q

It’s important to make Neutral connections first and break last to prevent __________________?

A

Severe voltage fluctuations in the service

34
Q

Formula for calculating KVA?

A

E x I / 1,000

35
Q

What is a capacitor and what does it do?

A

Two conductors separated by a di-electric material
- it corrects power factor

36
Q

____________ are connected in parallel to improve power factor

A

Shunt capacitors

37
Q

Transformers larger than ____ KVA have four secondary bushings

A

100 KVA

38
Q

What is a bowline rated for?

A

65% of the rope’s strength

39
Q

Ratings:
Knots
Hitches
Splices

A

50%
75%
85%

40
Q

What does the emergency control handle on a CSP do?

A

Increases full load capacity temporarily

41
Q

What is most power generated at?

A

13,800

42
Q

Four characteristics of a CSP?

A
  1. Externally mounted arrestor
  2. Internal primary fuse link
  3. Secondary breaker
  4. Overload indication light
43
Q

What does SF6 stand for? What does it do?

A

Sulfur Hexafloride
A dense arc snuffing gas

44
Q

If a nameplate shows “Grd” along with the primary voltage ____________?

A

Single bushing
H2 must be connected to system neutral

45
Q

A TX used to reduce voltage to a safe working level for purpose of metering and checking primary voltage accurately, connected in parallel

A

PT

46
Q

Total opposition to current flow in an AC circuit, measured in ohms

A

Impedance

47
Q

Capacitors have an ____________ that will reduce the voltage to 50 volts or less within 5 min

A

Internal discharge resistor

48
Q

What 3 physical dimensions determine pole classification?

A

Length, circumference 6’ from bottom, circumference of pole top

49
Q

Why do we transpose transmission lines?

A

To balance the line electrically and reduce radio noise

50
Q

What does a stress cone do?

A

Relieves electrical stress at point of termination

51
Q

When a line is de-energized what kind of opening is considered safe?

A

Visual open

52
Q

What 3 things should you check on a mechanical jumper?

A

Clean tight connections, insulation value, ampacity of wire

53
Q

What is the purpose of a distribution TX?

A

To reduce primary voltage to a usable voltage for the customer

54
Q

Name 3 factors to take into consideration when sagging conductor.

A

Temperature, span length, size of conductor

55
Q

What’s the purpose of a damper?

A

Limit vibration of the conductor

56
Q

What’s the purpose of armor rod?

A

Reinforce conductor and reduce chafing

57
Q

Why are cases of TX’s, circuit breakers, regulators etc. grounded?

A

Protection of public, workers, and equipment

58
Q

Process of de-energizing a capacitor

A

-Load break disconnects open
-Wait 5 min for discharge resistor to drain capacitance
-shunt bushings

59
Q

What are capacitors equipped with to drain capacitance?

A

Internal discharge resistor

60
Q

Why isn’t DC used for distribution?

A

Can not be transformed for one voltage to another easily

61
Q

How often should rubber gloves be inspected?

A

Before each use

62
Q

When are fault indicators activated?

A

Over currant situations

63
Q

Two design purposes of a fused cutout?

A
  1. Protect equipment from over load
  2. Isolate faulted equipment before upstream protection opens
64
Q

What does a regulator do?

A

A regulator corrects variations in voltage by adding or reducing turns to the primary coil in small incremental steps

65
Q

2 types of lightning arrestors

A

Valve type
Expulsion type

66
Q

What’s the purpose of bundling conductors?

A

To cut down on corona loss and increase current carrying capacity

67
Q

What is corona?

A

Discharge of ionized particles

68
Q

What’s the function of lightning arrestors?

A

To create a path for voltage surges to be dissipated to ground before harming equipment

69
Q

What precautions should be taken before working in a manhole?

A

-barricade the public
-expel harmful gasses
-competent observer
-rescue system

70
Q

How many watts equal on Horsepower

A

746 watts

71
Q

On a Wye-Delta closed bank, what type of TX must be used?

A

Two bushing TXs

72
Q

What is an LTC?

A

Load Tap Changer

73
Q

4 foot rule for excavation

A

And exit must be provided within 25’ if trench is 4’ or deeper

74
Q

What is an auto transformer?

A

A TX who’s primary and secondary have a common winding

75
Q

3 factors to take into consideration when sagging conductor

A

Temperature, span length, size of conductor

76
Q

What’s the purpose of a damper?

A

Limit vibration of the conductor

77
Q

3 ways of classifying a pole safe to climb

A

Visual inspection, sound inspection, bore test

78
Q

What is a generator?

A

A device that converts mechanical energy to electrical power

79
Q

Three most important things to consider on a nameplate ?

A

Voltage, impedance, and polarity

Test Prep (2 decks)

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