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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
How do you field test for polarity?
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
26
What does SF6 stand for? What does it do?
Silver-hexafloride Dense arc snuffing gas
27
You can rubber glove a maximum of ___ volts phase to phase off the pole without an insulated platform
5 KV
28
How do you verify a pole is safe to climb?
Visual inspection Sound test Bore test
29
What is the purpose of armor rod?
Reinforce conductor Reduce chafing
30
3 considerations when sagging conductor?
Temperature Span length Size of conductor
31
4 steps to grounding a line?
Identify De-energize Test Ground
32
What is the speed of light?
186,282 miles per second
33
It’s important to make Neutral connections first and break last to prevent __________________?
Severe voltage fluctuations in the service
34
Formula for calculating KVA?
E x I / 1,000
35
What is a capacitor and what does it do?
Two conductors separated by a di-electric material - it corrects power factor
36
____________ are connected in parallel to improve power factor
Shunt capacitors
37
Transformers larger than ____ KVA have four secondary bushings
100 KVA
38
What is a bowline rated for?
65% of the rope’s strength
39
Ratings: Knots Hitches Splices
50% 75% 85%
40
What does the emergency control handle on a CSP do?
Increases full load capacity temporarily
41
What is most power generated at?
13,800
42
Four characteristics of a CSP?
1. Externally mounted arrestor 2. Internal primary fuse link 3. Secondary breaker 4. Overload indication light
43
What does SF6 stand for? What does it do?
Sulfur Hexafloride A dense arc snuffing gas
44
If a nameplate shows “Grd” along with the primary voltage ____________?
Single bushing H2 must be connected to system neutral
45
A TX used to reduce voltage to a safe working level for purpose of metering and checking primary voltage accurately, connected in parallel
PT
46
Total opposition to current flow in an AC circuit, measured in ohms
Impedance
47
Capacitors have an ____________ that will reduce the voltage to 50 volts or less within 5 min
Internal discharge resistor
48
What 3 physical dimensions determine pole classification?
Length, circumference 6’ from bottom, circumference of pole top
49
Why do we transpose transmission lines?
To balance the line electrically and reduce radio noise
50
What does a stress cone do?
Relieves electrical stress at point of termination
51
When a line is de-energized what kind of opening is considered safe?
Visual open
52
What 3 things should you check on a mechanical jumper?
Clean tight connections, insulation value, ampacity of wire
53
What is the purpose of a distribution TX?
To reduce primary voltage to a usable voltage for the customer
54
Name 3 factors to take into consideration when sagging conductor.
Temperature, span length, size of conductor
55
What’s the purpose of a damper?
Limit vibration of the conductor
56
What’s the purpose of armor rod?
Reinforce conductor and reduce chafing
57
Why are cases of TX’s, circuit breakers, regulators etc. grounded?
Protection of public, workers, and equipment
58
Process of de-energizing a capacitor
-Load break disconnects open -Wait 5 min for discharge resistor to drain capacitance -shunt bushings
59
What are capacitors equipped with to drain capacitance?
Internal discharge resistor
60
Why isn’t DC used for distribution?
Can not be transformed for one voltage to another easily
61
How often should rubber gloves be inspected?
Before each use
62
When are fault indicators activated?
Over currant situations
63
Two design purposes of a fused cutout?
1. Protect equipment from over load 2. Isolate faulted equipment before upstream protection opens
64
What does a regulator do?
A regulator corrects variations in voltage by adding or reducing turns to the primary coil in small incremental steps
65
2 types of lightning arrestors
Valve type Expulsion type
66
What’s the purpose of bundling conductors?
To cut down on corona loss and increase current carrying capacity
67
What is corona?
Discharge of ionized particles
68
What’s the function of lightning arrestors?
To create a path for voltage surges to be dissipated to ground before harming equipment
69
What precautions should be taken before working in a manhole?
-barricade the public -expel harmful gasses -competent observer -rescue system
70
How many watts equal on Horsepower
746 watts
71
On a Wye-Delta closed bank, what type of TX must be used?
Two bushing TXs
72
What is an LTC?
Load Tap Changer
73
4 foot rule for excavation
And exit must be provided within 25’ if trench is 4’ or deeper
74
What is an auto transformer?
A TX who’s primary and secondary have a common winding
75
3 factors to take into consideration when sagging conductor
Temperature, span length, size of conductor
76
What’s the purpose of a damper?
Limit vibration of the conductor
77
3 ways of classifying a pole safe to climb
Visual inspection, sound inspection, bore test
78
What is a generator?
A device that converts mechanical energy to electrical power
79
Three most important things to consider on a nameplate ?
Voltage, impedance, and polarity

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