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WorksheetsETC 602 - SWITCHGEAR
Total questions: 50
Worksheet time: 8hrs 20mins
Switchgear is an electrical device that protects and _________ electrical distribution.
connect
connect
disconnect
close
Circuit breaker protect the circuit against short circuit and _________.
overcurrent
over voltage
over frequency
explosion
What type of circuit breaker is in the picture?
Miniature Circuit Breaker
Air Circuit Breaker
Vacuum Circuit Breaker
Gas Insulated Circuit Breaker
The MINIATURE CIRCUIT BREAKER has a current rating of _____ ampere or less.
100
200
300
400
Low Voltage range is ______ and below.
1000
2500
3500
4500
The MOLDED CASE circuit breaker has a current rating up to _______ amperes.
800
5000
7000
6000
Medium Voltage range is from 1,000 Volts to _________ Volts.
35,000
45,000
55,000
75,000
Magnetic Contactor is a part of switchgear.
TRUE
FALSE
The gas insulated circuit breaker needs to be used in _______ circuits.
High Voltage
Medium Voltage
Low Voltage
Extra Low Voltage
Disconnect switch IS NOT a part of SWITCHGEAR.
TRUE
FALSE
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.
bus bar
transformer
circuit breaker
rectifier
___________ are used for reducing/stepping down alternating current from higher value to lower value.
current transformer
voltage transformer
electrical converter
circuit breaker
____________ are used for stepping down alternating voltage from higher value to lower value.
current transformer
voltage transformer
electrical converter
circuit breaker
The ____________ is a device whose only function is to isolate equipment for maintenance.
disconnect switch
circuit breaker
plug
transformer
_________ is used to make or break the service current.
switch
AVR
conductor
bus
_________ is used to close or open the contacts in a motor circuit.
contactor
diagram
converter
bus bar
________ switch is used to connect a specific equipment to ground.
grounding
VT
CT
contactor
_______ are used to detect the fault and initiate action to isolate the fault.
Protective relay
overload relay
eletronic vacuum
circuit breaker
What do you call this device?
circuit breaker
magnetic contactor
protective relay
bus bar
What do you call this device?
circuit breaker
magnetic contactor
protective relay
bus bar
What do you call this device?
circuit breaker
magnetic contactor
protective relay
bus bar
What do you call this device?
circuit breaker
magnetic contactor
protective relay
bus bar
What do you this device in the picture?
current transformer
voltage transformer
auto transformer
relay
What do you call this device?
disconnect switch
transformer
CT
VT
What do you call this device?
disconnect switch
transformer
earthing switch
VT
_________ trip action is achieved through the use of a bimetal heated by the load current.
Thermal
Magnetic
Chemical
Voltage
__________ trip action is achieved through the use of an electromagnet in series with the load current.
Thermal
Magnetic
Chemical
Voltage
Dielectric strength of SF6 at atmospheric pressure is _______ times that of air
2.35
3.25
5.23
3.46
Which of the following is NOT designed to extinguish an arc?
water
air blast
SF6 Gas
Vacuum
Breakers will trip when the _____ senses a fault of abnormal event.
protection relay
transformer
bus
switch
The electricity can exist in a vacuum.
TRUE
FALSE
Oil circuit breaker is better than vacuum circuit breaker when it comes to reliability.
FALSE
TRUE
If the circuit breaker is closed, the color of the indicating light is __________.
RED
GREEN
If the circuit breaker is OPEN, the color of the indicating light is __________.
RED
GREEN
The current transformer steps down the value of current to _______ ampere.
1
10
100
120
The voltage transformer steps down the value of current to _______ volts.
1
10
100
120
Switchgear protects the generator, transformer and bus, by tripping breakers ope when a _______ happens.
fault
normal condition
High voltage value range is normally from ________ and above.
69 kV
600 Volts
15 kV
380 kV
_______ transformer allow relays to monitor bus voltage
Potential
Current
_________ tells you the status of the switchgear and equipment.
indicating lights
strobe and bell
In High Voltage applications, the _____ circuit breaker are the most common type of protection.
SF6
oil
High Voltage switchgears can be installed indoors.
TRUE
FALSE
_______________ are circuit breakers that are installed between the generator and main transformer.
Generator Circuit Breaker
Transformer Circuit Breaker
Power plant switchgears have current ratings that ranges from ___________ to 3150 A.
2,500 A
1,500 A
Which of the following is NOT a constructional design of switchgear.
Water Base
Metal Enclosed
Dead Tank
Live Tank
Which of the following IS NOT a part of switchgear.
frequency inverter
bus bar
circuit breaker
current transformer
The relay will trip the breaker __________ when fault occurs.
OPEN
CLOSE
A continuous current is a current that a circuit breaker can handle without _________.
overheating
overspeeding
The voltage rating of the circuit breaker depend on isulation _________ and quality
thickness
length
An isolated bus duct is a forced air-cooled above _______ Ampere current rating.
25,000
50,000
