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Switchgear and Protection

Which of the following is the least expensive protection for overcurrent is low voltage system ?

August 11, 2021December 17, 2018 by admin
Which of the following is the least expensive protection for overcurrent is low voltage system ?

A. Rewireable fuse
B. Isolator
C. Oil circuit breaker
D. Air break circuit breaker
E. None of the above

Categories Switchgear and Protection

Insulation resistance of high voltage circuit breakers is more than________________?

August 11, 2021December 17, 2018 by admin
Insulation resistance of high voltage circuit breakers is more than________________?

A. 1 mega ohms
B. 10 mega ohms
C. 100 mega ohms
D. 500 mega ohms

Categories Switchgear and Protection

The delay fuses are used for the protection of ___________?

August 11, 2021December 17, 2018 by admin
The delay fuses are used for the protection of ___________?

A. motors
B. power outlet circuits
C. fluorescent lamps
D. light circuits

Categories Switchgear and Protection

The time of closing the cycle, in modern circuit breakers is_____________?

August 11, 2021December 17, 2018 by admin
The time of closing the cycle, in modern circuit breakers is_____________?

A. 0.003 sec
B. 0.001 sec
C. 0.01 sec
D. 0.10 sec
E. none of the above

Categories Switchgear and Protection

For the protection of power station buildings against direct strokes the requirements are___________?

August 11, 2021December 17, 2018 by admin
For the protection of power station buildings against direct strokes the requirements are___________?

A. interception
B. interception and conduction
C. interception, conduction and dissipation
D. interception, conduction, dissipation and reflection
E. none of the above

Categories Switchgear and Protection

Wave trap is used to trap waves of__________________?

August 11, 2021December 17, 2018 by admin
Wave trap is used to trap waves of__________________?

A. power frequencies
B. higher frequencies entering generator or transformer units
C. either of the above
D. none of the above

Categories Switchgear and Protection

Resistance grounding is used for voltage between_________________?

August 11, 2021December 17, 2018 by admin
Resistance grounding is used for voltage between_________________?

A. 33kVto66kV
B. HkVto33kV
C. 3.3kVandllkV
D. none of the above

Categories Switchgear and Protection

The ground wire should not be smaller than No _________ copper

August 11, 2021December 17, 2018 by admin
The ground wire should not be smaller than No _________ copper

A. 2
B. 4
C. 6
D. 10

Categories Switchgear and Protection

Interruption of large currents by relay requires______________?

August 11, 2021December 17, 2018 by admin
Interruption of large currents by relay requires______________?

A. arc suppressing blow out coils
B. wide separation of the opened contacts
C. high speed opening of contacts
D. all of the above

Categories Switchgear and Protection

The arc voltage produced in A.C. circuit breaker is always_____________?

August 11, 2021December 17, 2018 by admin
The arc voltage produced in A.C. circuit breaker is always_____________?

A. in phase with the arc current
B. lagging the arc current by 90″
C. leading the arc current by 90°
D. none of the above

Categories Switchgear and Protection
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