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SSC JE 2017: Switchgear & Protection Rankers Quiz 5

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Question 1

What is the dimension of the copper strips used for the strip earthing?

Question 2

For average values of load current, current chopping occurs more frequently in:

Question 3

What is the factor of safety used for current ratings in a power installation?

Question 4

As per recommendation of ISI, the maximum number of points of lights, fans and socket outlets that can be connected in one sun-circuit is

Question 5

A circuit breaker is rated as 1500 A, 1000 MVA, 33 kV, 3-second, 3-phase oil circuit breaker. The rated normal current is

Question 6

Two fuse wires of the same material have fusing currents of 10A and 5A. The 10A fuse will have

Question 7

In a short-circuit test on a circuit breaker, the following readings were obtained on single frequency transient:
Time to reach the peak re-striking voltage =50

Peak re-striking voltage = 100 kV
The average RRRV is-

Question 8

For very long high voltage transmission lines, the system of overcurrent protection used is

Question 9

In the power system, the resonance rarely occurs at the supply frequency because

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ESE & GATE EE Power Systems

Jun 24ESE & GATE EE