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Month: December 2018

When a wave propagates on a transmission line, it suffers reflection several times at_____________?

August 11, 2021December 17, 2018 by admin
When a wave propagates on a transmission line, it suffers reflection several times at_____________?

A. tapg
B. load end
C. sending end
D. sending and other end
E. all of the above

Categories Switchgear and Protection

The reflection co-efficient at the open circuited end of a transmission line___________?

August 11, 2021December 17, 2018 by admin
The reflection co-efficient at the open circuited end of a transmission line___________?

A. zero
B. infinity
C. unity
D. none of the above

Categories Switchgear and Protection

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?

August 11, 2021December 17, 2018 by admin
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?

A. lubricate the contacts
B. insulate the contacts from switch body
C. extinguish the arc
D. all of the above
E. none of the above

Categories Switchgear and Protection

H.R.C. fuses provide best protection against________________?

August 11, 2021December 17, 2018 by admin
H.R.C. fuses provide best protection against________________?

A. overload
B. reverse current
C. open-circuits
D. short-circuits

Categories Switchgear and Protection

To protect most of the electrical equipment handling low power, the types of relays used are______________?

August 11, 2021December 17, 2018 by admin
To protect most of the electrical equipment handling low power, the types of relays used are______________?

A. thermocouple
B. electronic and bimetallic
C. both (A) and (B)
D. none of the above

Categories 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
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