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Ibew > 1-5 > Flashcards

1-5 Flashcards

1
Q

The voltage dropped across resistor is

A

6 volts

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2
Q

Good housekeeping distinguishes a good employee from a(n)

A

Indifferent one

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3
Q

When tension stringing over a live circuit, ideally______ of clearance shall be maintained.

A

10 foot

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4
Q

The power or heat lost in a conductor can be calculated with the _____ formula.

A

2

P=i r

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5
Q

If a company has a ratio of 1:3 of apprentices to journeyman and there are 6 apprentices how many journeyman are there ?

A

18

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6
Q

What is the sum of 3/8 + 7/32 + 9/16

A

37/32

Or 1 5/31

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7
Q

The four main components in a stringing operation are the_________ puller, the stringing blocks, and the bull line.

A

Tensioner

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8
Q

Some utilities require gloves to be worn continuously while working on any structure carrying live conductors. This Is an example of the ________ rule.

A

Ground or ground

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9
Q

The power consumed in R2 is

A

1440 W

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10
Q

In a parallel circuit, if the total resistance Is known what is the formula to find total current ?

A

I=E/R

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11
Q

The ______ radial systems provides for feeding the load from two directions, thereby allowing for defective loads to be normal operation while the fault is being corrected.

A

Looped primary

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12
Q

Whenever current flows through a wire, a __________ is created around the wire .

A

A magnetic field

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13
Q

To promote a fast trip out of protective equipment, a ___________ should be installed.

A

Traveling grounds

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14
Q

A ratio is comparison of two quantities by ___________.

A

Dividing

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15
Q

A line should be sagged according to the _______

A

Initial or stringing sag chart

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16
Q

An electrical worker can stay isolated from an energized conductor by_______.

A

Maintaining minimum approach distance

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17
Q

When two power sources are connected in parallel, the circuit voltage will_________.

A

Remain the same

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18
Q

The voltage and current values in a transformer primary coil are inversely proportional to the voltage and current values in the secondary coil. A certain transformer has a primary rating of 7200v and a secondary rating of 480v. When the primary current flow, is 8 amperes, the secondary current flow is______.

A

120 amps

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19
Q

Total resistance of this circuit is

A

4 ohms

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20
Q

The voltage drop across resistor 2 is _________.

A

12 amps

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21
Q

Using the given current flow and resistance values, solve for the power rating of r1 in the circuit.

A

480 watts

22
Q

A typical four jaw meter socket is supplied by a triplex service line and is energized. The customer main disconnect is in the open position before setting the meter you have taken voltage reading and there is a 120v potential from a top to a bottom jaw in the socket s1 l1 this reading indicates__________.

A

A ground on the customer side and a potential dead short.

23
Q

All rotating armatures produce_______

A

Direct current

24
Q

The amount of power used by each resistor can be found by using ______ law.

A

Watts

25
Q

Conductor attachments that hold securely and protect the conductor from vibration without installing armor rods are _________.

A

Pre formed ties

26
Q

The total current from a four-branch parallel circuit with branch currents of 4 amperes, 5 amperes, 5 amperes and 6 amperes is _________. The supply voltage is 120 volts.

A

20 amps

27
Q

A distribution transformer is supplied by a 2400 volt primary line. The voltage ratio of this transformer from primary to secondary is 5:1. This unit delivers a secondary potential of volts.

A

480 volts

28
Q

In DC generators, the rotating windings are connected to a________ that is segment and reverses the loop connection every half cycle.

A

Commutator

29
Q

The Total resistance of 4 resistors connected in parallel will be a value ______ the smallest resistor value in the circuit.

A

Smaller then

30
Q

The easier and quicker detection and repair of a breakdown is an advantage of the _________ system

A

Overhead

31
Q

A parallel circuit is also a current _______ circuit

A

Adding

32
Q

EVH lines require _______ at suspension points and dead ends to prevent the magnetic fields from concentrating in any given location.

A

Corona shields

33
Q

If the direction of current in a conductor is knowns, the direction of the magnetic flux lines can be determined by using the ________.

A

Left hand rule

34
Q

A 6 AWG solid copper wire has ____ than the same type of wire sized 4 AWG.

A

More resistance

35
Q

The power consumed in a parallel circuit that has a source voltage of 12,500 volts and total circuit current of 4 amperes is ________.

A

50,000

36
Q

A cable conductor has 1/2 diameter. The cross sectional area of this conductor is ________.

A

500 kcmil

37
Q

For proper tolerance, holes bored in wooden poles are 1/16 larger than the bolts used. To install a 1// bolt a _______ auger bit is required.

A

9/16

38
Q

The facility connecting the transmission systems to the customers equipment is called the _________.

A

Distribution systems

39
Q

When splicing a triplex service wire______

A

Only the neutral takes a tensión sleeve

40
Q

During stringing operations ________ is not allowed while the conductor is in motion.

A

Being on a pole

41
Q

What is the ratio of 7200 volts to 240 volts ?

A

30:1

42
Q

In order for the current to flow through a persons body, there must be a _______.

A

Difference of potential

43
Q

Solve for the current flow through R1

A

.5 amps

44
Q

What is the total resistance of this parallel circuit?

A

4 ohms

45
Q

Whenever a magnetic field cuts through a conductor, a _______ wil be induced into that conductor .

A

Voltage

46
Q

If X and Y are directly proportionally and X2 =6. And Y1=4 and Y2=8. The value of X1is _______

A

3

47
Q

The relative field strength of a coil is measured in ________.

A

Ampere- turns

48
Q

The national electric safety code guidelines requieres a service line attachment on a building to be a minimum of ________ above ground lines.

A

12 foot

49
Q

When performing barehand work , no _____ will flow inside the faraday cage.

A

Voltage

50
Q

The liner of an insulated bucket truck platform requires ________.

A

Periodic dielectric testing

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