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3rd 6 Months ELEC > 3rd Six Month Final Exam > Flashcards

3rd Six Month Final Exam Flashcards

1
Q

What is the purpose of auxiliary contacts?

A

To protect the main contacts from burning by closing first and opening last

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2
Q

When is the breaker trip -free?

A

When it’s close to a fault

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3
Q

How long does the reactivation process take?

A

Same amount of time as the compressor has running to recharge the receiver

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4
Q

How is The air breaker operation dried ?

A

Conducting the air up through an automatic drying system

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5
Q

What is the purpose for the SF6 gas in a air-blast circuit breaker?

A

Insulate the support column current

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6
Q
What is the reading on the vernier scale below ?
A

3.059

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7
Q

Electrical energy per unit of charge is measured in

A

Volts

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8
Q

The radar which work is done is called ______ it is measured in ______

A

Power ; foot-pound pounds per second

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9
Q

The force of gravity on an object is its _____ the measure of how much matter is in an object is its _______

A

Weight ; mass

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10
Q

Surface roughness is measured in ?

A

Microinches

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11
Q

Potential difference is the difference in electrical_______ between two places

A

Potential energy

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12
Q

A temperature at which some physical event occurs is called _____ temperature

A

Critical

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13
Q

Whenever a circuit, which is current current is open

A

The current tends to continue to flow across the contacts as they separate

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14
Q

In a HVDC transmission system ?

A

The quantity and direction of power flow may be controlled with high accuracy and extreme rapidity?

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15
Q

Transformers have only one winding are called ?

A

Autotransformers

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16
Q

A single phase transformer may have an ?

A

Air core

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17
Q

Eddie currents are circulating current that cause

A

A loss of energy

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18
Q

Which of the below statements does not correctly describe a means or method for quenching an arc ?

A

Reducing the reluctance across the contacts

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19
Q

A power transformer, transfers, energy power from one circuit at a certain frequency and voltage and to a second circuit at

A

A different voltage and same frequency

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20
Q

Circuit breaker the Arc is normally quenched

A

By increasing the resistance across the contacts

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21
Q

Suspension type insulators

A

All three

22
Q

A transformer developed 120 Volts in its secondary when a 2400 V source was connected across the primary assuming a primary 25 amperes secondary current is

A

500 amps

23
Q

Electrostatic and electromagnetic unbalanced between phases in a three phase transmission line is reduced by

A

Transposing or rotating the conductor

24
Q

All protective relaying may be classified according to the

A

Function they perform

25
Q

Transmission lines losses due to corona may be reduced by all of the below, except ?

A

Increasing voltages value

26
Q

The conservator system is used on transformers oil

A

Preserve the dielectric strength of the transformer oil

27
Q

A fast realistic circuit breaker opening operation (Art out time ) would be ?

A

Three to four cycles

28
Q

A three phase 138 KV circuit breaker can interrupt 12,000 A. What is this interrupting capacity in MVA

A

1656 MVA

29
Q

A blowout coil would most likely be found in ?

A

An air magnetic circuit breaker

30
Q

The high dialectic strength of gas such as SF6 under static conditions is maintained by ?

A

Pressurizing

31
Q

In a energize transformer, iron losses are present, even if there is no load on the secondary

A

True

32
Q

Disconnect which are commonly used on 440 or higher vote circuit to ?

A

Isolate or to ground electrical equipment or circuits not in service

33
Q

A three phase 138 KV circuit breaker can’t interrupt 12,000 A. What is this interrupting capacity in MVA

A

1656 MVA

34
Q

Transformers are classified as static AC machines ?

A

True

35
Q

Of the following statements concerning mercury control, switches the one which is most nearly not correct is

A

They are generally used only where the circuit voltage is 120 or less

36
Q

The primary reason for not replacing a blown fuse with a piece of copper wire is because ?

A

The desire circuit protection against overload may loss

37
Q

The barricaded tape used to keep personnel out of an area where hazardous electrical work is being performed should be

A

Displayed at a readily visible level

38
Q

The most important consideration and selecting a mold case circuit breaker is ?

A

Potential difference

39
Q

If a person is a victim of electrical shock, your immediate action should be to ?

A

Ensure that breathing and circulation are maintain

40
Q

The first step in locking out power to a piece of equipment is to ?

A

Notify the operator

41
Q

What tool is intended to be used to verify that a circuit has been de-energize

A

Voltage tester

42
Q

The NEC defines a qualified person as someone who ?

A

Is familiar with the equipment operations and hazards

43
Q

If a victim of electric shock is unconscious, you should ?

A

Check for breathing and a pulse

44
Q

The code on the back of a sanding belt indicates ________ of the sandpaper

A

Grade of grit

45
Q

The blade motion of a reciprocating saw is ?

A

Back-and-forth in line with the motor

46
Q

When drilling with a diamond - aggregate core bit , you must use a special rotary hammer and a _____

A

Stand

47
Q

Examples of template routing include

A

Hinge - butt mortises

48
Q

When using an electric hammer always wear ?

A

Safety glasses

49
Q

You can prevent electric shock from power cords by ?

A

Grounding them 

50
Q

We should never be removed from a three-prong plug ?

A

Grounding prong

3rd 6 Months ELEC (7 decks)

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