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3-2 Test > 3-2 Test > Flashcards

3-2 Test Flashcards

1
Q

In labor relations if two parties cannot agree the matter is turned over to a their party who makes the decision this is called ?

A

Arbitration

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2
Q

A ___ should be used to solve a problem not to win an argument

A

Grievance

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3
Q

The pathway that current takes in a workers body

A

Directly impacts the severity of the electrical shock

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4
Q

The human body’s reaction to a 16 ma current flow is a

A

Muscle contraction

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5
Q

The Relationship among resistors in a series circuit is that they

A

Combine to equal a total resistance

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6
Q

The characteristic of a series circuit is that it has

A

One continuous path for current flow

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7
Q

Which of the following is still a commonly used yet incorrect grounding protection scheme and is the most dangerous method still in use today ?

A

Bracket grounding

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8
Q

The schematic represents a grounding scheme with

A

Ground cables connected from each phase to common ground

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9
Q

Should a line become energized an equipotential zone maintained the current between the workers contact point and feet to

A

An acceptably low level

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10
Q

The federal regulation stating the order connection and removal of power line grounding jumpers is found in osha

A

1910.269 sub part r

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11
Q

To establish an equipotential zone at a work site a ___ must be placed in parallel with the worker

A

Low resistance shunt

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12
Q

A pole down ground should not be used as the only connection to earth when grounding a line because it might

A

Fuse under fault current

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13
Q

Jacket material on grounding cables is normally rated at

A

600v

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14
Q

If there is no pole ground present what step must be taken

A

An additional ground must be attached from the cluster bar to a driven ground rod

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15
Q

Grounding jumpers and components must meet the ___ f855 governing standard

A

ASTM

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16
Q

The smallest cable allowed for grounding is

A

2 AWG

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17
Q

When applying protective grounds the first connection should always be

A

The ground end

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18
Q

One danger from grounds during the fault current flow is

A

Cable whipping

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19
Q

A worker is standing in a conductive ground mat that has accidentally become energized the first step off the mat will

A

Bridge the maximum voltage drop

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20
Q

Rubber overshoes worn to protect against touch and step potential are manufactured in accordance ___ standards

A

ASTM

21
Q

The surface area of an equipotential zone can be extended with the use of

A

Ground mats

22
Q

When grounds are applied in such a way at that a closed circuit is formed through the line and earth return a type of ____ transformer is created

A

Air core

23
Q

If an isolated line is capacitive coupled to an energized line ___ earth connection are required for the line to be taken to zero at that point

A

1

24
Q

Workers at ground level can be subject to nuisance shock caused by ____
From nearby lines

A

Capacitive coupled voltages

25
Q

If a boom contacts an energized line a worker standing near but not touching the truck is in danger of

A

Step potential

26
Q

Electromagnetic ____ causes current flow in circuits completed by the earths paths

A

Induction

27
Q

A truck with an uninsulated boom is bonded to a driven ground rod if the boom contacts an energized line fault current will flow through

A

All points of earth contact

28
Q

When workers are injured it is often the result of misidentified phases bad neutrals and

A

Unsafe work practices

29
Q

A ___ is used to ensure a URD cable is electrically isolated before cutting it

A

Spiking tool

30
Q

The best method of establishing an EPZ around a urd transformer in the field is to

A

Connect and use a portable ground mat

31
Q

Grounding jumpers fitted with ___ clamps are designed to fit tubular bus with a diameter up to 2.88 inches

A

All angle

32
Q

Before grounding lines or equipment in substations ___ must be discharged

A

Capacitors

33
Q

Asymmetrical current caused by the large amount of inductance present from transformers and reactors versus the small amount of resistance present in the substation _____

A

Buses

34
Q

To reduce the current through a ground rod additional driven grounds can be paralleled. These additional rods must be spaced

A

Twice the distance they are driven into the earth

35
Q

When current is introduced to a ground rod the current will flow away from the round rod in ____ directions

A

All

36
Q

A ___ depends on several factors to establish a low ground resistance the earth it is in the contact it is making with the earth the type of rod used and the length

A

Ground rod

37
Q

The main reason to extend a ground rods length in poor soil is to get closer to

A

Moisture

38
Q

Using a fall of potential test when testing a ground rods resistance connection to the earth ____ temp probes must be used

A

3

39
Q

In theory by adding more length to a ground rod the resistance

A

Decreases

40
Q

The two main ground resistance tests used in the electrical industry is the fall of potential test and the

A

Clamp on ground tester

41
Q

Lightning generates heat in a ___ path of approximately 60,000 degrees three times hotter than the surface temp of the sun

A

2.5 cm

42
Q

If the charge in the cloud increases beyond the critical breakdown point of air what will occur

A

Lightning

43
Q

______ is the most frequent cause of transient faults

A

Lightning

44
Q

A lightning strike discharges from clouds to the earth containing millions of volts and currents ranging from 2,000 to ___

A

200,000

45
Q

When talking about LAS the initials MOV means ?

A

Metal oxide varistors

46
Q

The maximum discharge voltage of an LA should be ___ less than the BIL of the equipment that is to protect

A

20%

47
Q

A ____ type arrestor would be installed in a 230 kv switch yard

A

Station

48
Q

The ____ relives the line to wich it is attached of the greater than normal voltage impressed on it by events such as lightning and prevents the further flow of power current

A

Lightning arrestor

49
Q

For a lightning arrestor to successfully fulfill its function it must be properly coordinated with the ____ it is protecting

A

Equipment

3-2 Test (1 decks)

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