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ETC 602 - SWITCHGEAR

Total questions: 50

Worksheet time: 8hrs 20mins

Name
Class
Date
1.

Switchgear is an electrical device that protects and _________ electrical distribution.

a)

connect

b)

connect

c)

disconnect

d)

close

2.

Circuit breaker protect the circuit against short circuit and _________.

a)

overcurrent

b)

over voltage

c)

over frequency

d)

explosion

3.

What type of circuit breaker is in the picture?

a)

Miniature Circuit Breaker

b)

Air Circuit Breaker

c)

Vacuum Circuit Breaker

d)

Gas Insulated Circuit Breaker

4.

The MINIATURE CIRCUIT BREAKER has a current rating of _____ ampere or less.

a)

100

b)

200

c)

300

d)

400

5.

Low Voltage range is ______ and below.

a)

1000

b)

2500

c)

3500

d)

4500

6.

The MOLDED CASE circuit breaker has a current rating up to _______ amperes.

a)

800

b)

5000

c)

7000

d)

6000

7.

Medium Voltage range is from 1,000 Volts to _________ Volts.

a)

35,000

b)

45,000

c)

55,000

d)

75,000

8.

Magnetic Contactor is a part of switchgear.

a)

TRUE

b)

FALSE

9.

The gas insulated circuit breaker needs to be used in _______ circuits.

a)

High Voltage

b)

Medium Voltage

c)

Low Voltage

d)

Extra Low Voltage

10.

Disconnect switch IS NOT a part of SWITCHGEAR.

a)

TRUE

b)

FALSE

11.

An electrical______ is defined as a conductor or a group of conductor used for collecting electric power from the incoming feeders and distributes them to the outgoing feeders.

a)

bus bar

b)

transformer

c)

circuit breaker

d)

rectifier

12.

___________ are used for reducing/stepping down alternating current from higher value to lower value.

a)

current transformer

b)

voltage transformer

c)

electrical converter

d)

circuit breaker

13.

____________ are used for stepping down alternating voltage from higher value to lower value.

a)

current transformer

b)

voltage transformer

c)

electrical converter

d)

circuit breaker

14.

The ____________ is a device whose only function is to isolate equipment for maintenance.

a)

disconnect switch

b)

circuit breaker

c)

plug

d)

transformer

15.

_________ is used to make or break the service current.

a)

switch

b)

AVR

c)

conductor

d)

bus

16.

_________ is used to close or open the contacts in a motor circuit.

a)

contactor

b)

diagram

c)

converter

d)

bus bar

17.

________ switch is used to connect a specific equipment to ground.

a)

grounding

b)

VT

c)

CT

d)

contactor

18.

_______ are used to detect the fault and initiate action to isolate the fault.

a)

Protective relay

b)

overload relay

c)

eletronic vacuum

d)

circuit breaker

19.

What do you call this device?

a)

circuit breaker

b)

magnetic contactor

c)

protective relay

d)

bus bar

20.

What do you call this device?

a)

circuit breaker

b)

magnetic contactor

c)

protective relay

d)

bus bar

21.

What do you call this device?

a)

circuit breaker

b)

magnetic contactor

c)

protective relay

d)

bus bar

22.

What do you call this device?

a)

circuit breaker

b)

magnetic contactor

c)

protective relay

d)

bus bar

23.

What do you this device in the picture?

a)

current transformer

b)

voltage transformer

c)

auto transformer

d)

relay

24.

What do you call this device?

a)

disconnect switch

b)

transformer

c)

CT

d)

VT

25.

What do you call this device?

a)

disconnect switch

b)

transformer

c)

earthing switch

d)

VT

26.

_________ trip action is achieved through the use of a bimetal heated by the load current.

a)

Thermal

b)

Magnetic

c)

Chemical

d)

Voltage

27.

__________ trip action is achieved through the use of an electromagnet in series with the load current.

a)

Thermal

b)

Magnetic

c)

Chemical

d)

Voltage

28.

Dielectric strength of SF6 at atmospheric pressure is _______ times that of air

a)

2.35

b)

3.25

c)

5.23

d)

3.46

29.

Which of the following is NOT designed to extinguish an arc?

a)

water

b)

air blast

c)

SF6 Gas

d)

Vacuum

30.

Breakers will trip when the _____ senses a fault of abnormal event.

a)

protection relay

b)

transformer

c)

bus

d)

switch

31.

The electricity can exist in a vacuum.

a)

TRUE

b)

FALSE

32.

Oil circuit breaker is better than vacuum circuit breaker when it comes to reliability.

a)

FALSE

b)

TRUE

33.

If the circuit breaker is closed, the color of the indicating light is __________.

a)

RED

b)

GREEN

34.

If the circuit breaker is OPEN, the color of the indicating light is __________.

a)

RED

b)

GREEN

35.

The current transformer steps down the value of current to _______ ampere.

a)

1

b)

10

c)

100

d)

120

36.

The voltage transformer steps down the value of current to _______ volts.

a)

1

b)

10

c)

100

d)

120

37.

Switchgear protects the generator, transformer and bus, by tripping breakers ope when a _______ happens.

a)

fault

b)

normal condition

38.

High voltage value range is normally from ________ and above.

a)

69 kV

b)

600 Volts

c)

15 kV

d)

380 kV

39.

_______ transformer allow relays to monitor bus voltage

a)

Potential

b)

Current

40.

_________ tells you the status of the switchgear and equipment.

a)

indicating lights

b)

strobe and bell

41.

In High Voltage applications, the _____ circuit breaker are the most common type of protection.

a)

SF6

b)

oil

42.

High Voltage switchgears can be installed indoors.

a)

TRUE

b)

FALSE

43.

_______________ are circuit breakers that are installed between the generator and main transformer.

a)

Generator Circuit Breaker

b)

Transformer Circuit Breaker

44.

Power plant switchgears have current ratings that ranges from ___________ to 3150 A.

a)

2,500 A

b)

1,500 A

45.

Which of the following is NOT a constructional design of switchgear.

a)

Water Base

b)

Metal Enclosed

c)

Dead Tank

d)

Live Tank

46.

Which of the following IS NOT a part of switchgear.

a)

frequency inverter

b)

bus bar

c)

circuit breaker

d)

current transformer

47.

The relay will trip the breaker __________ when fault occurs.

a)

OPEN

b)

CLOSE

48.

A continuous current is a current that a circuit breaker can handle without _________.

a)

overheating

b)

overspeeding

49.

The voltage rating of the circuit breaker depend on isulation _________ and quality

a)

thickness

b)

length

50.

An isolated bus duct is a forced air-cooled above _______ Ampere current rating.

a)

25,000

b)

50,000