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# GATE 2023 Power Systems Quiz 51

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Question 1 cycle circuit breaker is used for clearing a fault in transmission line, so that it has fault clearing time & arcing time are 120 msec & 5 msec respectively. Calculate relay operating time.

Question 2

Which of the following is a universal torque equation

Question 3

While energizing a transform to prevent the mal operation of a differentially connected relay, the relay restrained coil is biased with which of the following harmonic component?

Question 4

In which of the following circuit breaker current chopping mainly occurs?

Question 5

If the relay setting is 50% and CT ratio is 500:4 and plug setting multiplier is 10. What is the fault current?

Question 6

Consider the following statements regarding translay relays.
A) A single relay is not enough to protect the each set of 3-phase system.
B) More primarily this relay is used for feeder protections.
C) A single relay is enough to protect the each 3-phase set of current transformers.
D) It is a type of differential relay.
Which of the following option is/are correct?

Question 7

The P.S.M of an over current relay is 1.2 and it is connected to a supply circuit through 1000/2  C.T. If the primary current of C.T is 1200Amps and its relay operating coil (ROC) has number of turns 144 . If the Plug setting is adjusted to 4A, then the no turns in the relay operating coil will be________?

Question 8

A relay at rating 8 A, 2.2 sec IDMT and having a relay setting of 130% TMS = 0.6. It is connected to a supply circuit through a CT ratio 400/5 ratio. If the fault current is 5000 A, the plug setting multiplier of the relay is
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