Exam

Question 1

Who is the founder of IBEW?

Answer 1

Henry Miller in 1891

Question 2

Changing taps on a xfmer

Answer 2

Taps can only be operated de-energized state and will step up or down voltage in 2.5% increments

Question 3

Full load amps

Answer 3

Kva/coil ex. 37.5kvax1000
37500/7200=5.2A primary
37500/240=156A secondary

Question 4

What are the two purposes of capacitors?

Answer 4

• Reduce line loss
• Improve power factor

Question 5

Transformer polarity

Answer 5

8660v and 200kva and above= subtractive

8660v and 200kva and below= additive

Question 6

What is a regulator and how does it work?

Answer 6

A device used to control circuit voltage by raising or lowering (buck/boost) voltage to maintain a constant quantity.

Question 7

What is Back Feed?

Answer 7

Voltage passed from load side to source side

Question 8

What is a reclosure and how does it work?

Answer 8

A reclosure is a device that senses and interrupts fault current and automatically restores service after a momentary outage.

Question 9

How would you use a rotation meter and why?

Answer 9

You attach the small 3-phase motor to your secondary leads, mark leads accordingly, and after reinstalling the bank, ensure the customer has proper rotation.

Question 10

What happens if an insulated boom contacts two phases simultaneously?

Answer 10

It puts the workers in series.

Question 11

What’s on a tailboard?

Answer 11

Hazards associated with the job, special precautions, work procedures, energy source controls.

Question 12

What is KVAR?

Answer 12

A measure of reactive power.

Question 13

What is the function of a fused cutout?

Answer 13

It serves as a weak point to protect the lowside and isolate in a fault situation.

Question 14

What is a sectionalizer?

Answer 14

A device that works in conjunction with a reclosure to sectionalize a section of a circuit. A sectionalizer will not open under load.

Question 15

What are the two types of electrical contact?

Answer 15

Direct and indirect.

Question 16

When can you enter a vault without forced ventilation?

Answer 16

When you have a sniffer/ air monitor 100% of the time.

Question 17

What is guy length?

Answer 17

a² + b² = c² remove the amount of pole in the ground.

Question 18

What is the minimum wraps on a wire drum

Answer 18

4 wraps.

Question 19

What is voltage?

Answer 19

A force that pushes current.

Question 20

What is Ohm’s Law?

Answer 20

1 volt will force 1 amp through 1 ohm of resistance

Question 21

What is frequency?

Answer 21

The number of complete wave forms completed in one second unit of measurement.

Question 22

What is Climbing Space?

Answer 22

A clear section of the pole to climb and avoid hazards.

Question 23

What is EPZ?

Answer 23

A parallel shunt around the worker to reduce fault current across the worker’s body.

Question 24

What happens when you ground one phase on a Delta System?

Answer 24

Nothing; you can ground one phase at a time.

Question 25

How are Capacitors connected?

Answer 25

In parallel.

Question 26

How many watts are in one horsepower?

Answer 26

746 watts.

Question 27

What do the letters K and T represent in fuses?

Answer 27

K = Quick, T = Timed.

Question 28

What must switches be timed for?

Answer 28

So there's no excessive arcing.

Question 29

What are the means of re-energization?

Answer 29

Lightning, Backfeed, Induction, Static, Accidental contact, Accidental re-energization

Question 30

MAD

Answer 30

MAD values: 13.2 = 2'3", 34.5 = 3', 115 = 4’8”, 230 = 10’2”

Question 31

What is considered high voltage?

Answer 31

High voltage is defined as 600 V

Question 32

How is neutral defined?

Answer 32

Neutral is a current carrying conductor that is the return for system imbalance and must be macked out before cutting open.

Question 33

How is guy tension calculated?

Answer 33

Guy length/anchor lead X line tension

Question 34

What are five things a lineman can do alone?

Answer 34

1. Re-fuse cutout with hot stick 2. Operate switch with handle or hot stick 3. Install or remove hot tap (not dropping/picking up load) 4. Remove load metering device 5. Emergency repair to keep public safe

Question 35

What is the fall protection requirement after 4'

Answer 35

100% fall protection

Question 36

What is a not symptom of heat exhaustion?

Answer 36

Pale, waxy skin

Question 37

How many bushings are on cans over 100 kVA?

Answer 37

4 bushings outside

Question 38

What size transformer is needed for a 10 horsepower motor?

Answer 38

7460 = 7.5 kVA ## Footnote Calculation: (746)(10)

Question 39

What should you do before pulling a bayonet fuse?

Answer 39

Pull your bleeder valve

Question 40

If someone breaks their lower leg, what should you stabilize?

Answer 40

Knee, ankle, broken end

Question 41

How much weight can you put on a ladder?

Answer 41

2.5 times the weight of the ladder

Question 42

What is Clearance?

Answer 42

Certification by the proper authority that a line has been de-energized and grounded. Locked out & tagged out.

Question 43

How do you obtain a Clearance?

Answer 43

Contact dispatch, specify line/equipment and open points using 3 way communication

Question 44

What is an eye splice good for?

Answer 44

90% of ropes breaking strength

Question 45

What voltage and duration can fiberglass and wood withstand?

Answer 45

Fiberglass: 100,000 volts per foot for 5 minutes. Wood: 75,000 volts per foot for 5 minutes.

Question 46

Why should transformers have similar resistance?

Answer 46

The less resistance can will take all the load and overheat.

Question 47

What is a lightning arrestor?

Answer 47

Diverts over current to ground potential protecting the equipment in parallel.

Question 48

How to take a capacitor offline?

Answer 48

-Open with load break tool -Roll back high sides - Wait 5 minutes - Test, ground - Shunt

Question 49

How to take a Regulator offline?

Answer 49

Set to manual, shut off supervisory control. - Step to neutral - Verify neutral 3 ways (neutral light, hands on dial, testing) -put controls to off - Pull motor fuse - Close bypass - Open load & source sides.

Question 50

Best sling configuration?

Answer 50

Basket.

Question 51

Series street lights

Answer 51

6.6 amps

Question 52

Ohms law

Answer 52

E=I(R)