3rd Six Month Final Exam

Question 1

What is the purpose of auxiliary contacts?

Answer 1

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

Question 2

When is the breaker trip -free?

Answer 2

When it’s close to a fault

Question 3

How long does the reactivation process take?

Answer 3

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

Question 4

How is The air breaker operation dried ?

Answer 4

Conducting the air up through an automatic drying system

Question 5

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

Answer 5

Insulate the support column current

Question 6

What is the reading on the vernier scale below ?

Answer 6

3.059

Question 7

Electrical energy per unit of charge is measured in

Answer 7

Volts

Question 8

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

Answer 8

Power ; foot-pound pounds per second

Question 9

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

Answer 9

Weight ; mass

Question 10

Surface roughness is measured in ?

Answer 10

Microinches

Question 11

Potential difference is the difference in electrical_______ between two places

Answer 11

Potential energy

Question 12

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

Answer 12

Critical

Question 13

Whenever a circuit, which is current current is open

Answer 13

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

Question 14

In a HVDC transmission system ?

Answer 14

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

Question 15

Transformers have only one winding are called ?

Answer 15

Autotransformers

Question 16

A single phase transformer may have an ?

Answer 16

Air core

Question 17

Eddie currents are circulating current that cause

Answer 17

A loss of energy

Question 18

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

Answer 18

Reducing the reluctance across the contacts

Question 19

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

Answer 19

A different voltage and same frequency

Question 20

Circuit breaker the Arc is normally quenched

Answer 20

By increasing the resistance across the contacts

Question 21

Suspension type insulators

Answer 21

All three

Question 22

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

Answer 22

500 amps

Question 23

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

Answer 23

Transposing or rotating the conductor

Question 24

All protective relaying may be classified according to the

Answer 24

Function they perform

Question 25

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

Answer 25

Increasing voltages value

Question 26

The conservator system is used on transformers oil

Answer 26

Preserve the dielectric strength of the transformer oil

Question 27

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

Answer 27

Three to four cycles

Question 28

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

Answer 28

1656 MVA

Question 29

A blowout coil would most likely be found in ?

Answer 29

An air magnetic circuit breaker

Question 30

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

Answer 30

Pressurizing

Question 31

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

Answer 31

True

Question 32

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

Answer 32

Isolate or to ground electrical equipment or circuits not in service

Question 33

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

Answer 33

1656 MVA

Question 34

Transformers are classified as static AC machines ?

Answer 34

True

Question 35

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

Answer 35

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

Question 36

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

Answer 36

The desire circuit protection against overload may loss

Question 37

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

Answer 37

Displayed at a readily visible level

Question 38

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

Answer 38

Potential difference

Question 39

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

Answer 39

Ensure that breathing and circulation are maintain

Question 40

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

Answer 40

Notify the operator

Question 41

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

Answer 41

Voltage tester

Question 42

The NEC defines a qualified person as someone who ?

Answer 42

Is familiar with the equipment operations and hazards

Question 43

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

Answer 43

Check for breathing and a pulse

Question 44

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

Answer 44

Grade of grit

Question 45

The blade motion of a reciprocating saw is ?

Answer 45

Back-and-forth in line with the motor

Question 46

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

Answer 46

Stand

Question 47

Examples of template routing include

Answer 47

Hinge - butt mortises

Question 48

When using an electric hammer always wear ?

Answer 48

Safety glasses

Question 49

You can prevent electric shock from power cords by ?

Answer 49

Grounding them 

Question 50

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

Answer 50

Grounding prong