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SSC JE 2017: SwitchGear & Protection Rankers Quiz 6

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Question 1

The purpose of Surge Arrester is to:

Question 2

In a transformer, which among the following statement is correct with respect to short-circuit test?

Question 3

Which information is correct for miniature circuit breaker?

Question 4

Which of the following is true about the Optical Ground Wire?

Question 5

Match List-I (Type of fault) with List-II (Type of protection) and select the correct answer using the code given below the lists:
List-I
A) External phase fault
B) Faults between phases
C) Phase to earth fault
D) Overheating
List-II
1) Differential protection
2) Earth fault relay
3) Over-current protection (inverse time delay o/c relay)
4) Thermal relay

Question 6

Consider the following statements:
Assertion (A) : A capacitor is connected in the polarizing circuit of the mho relay to prevent its in operation when three phase faults occur very close to the relay.
Reason (R) : Capacitor provides memory action and thus maintains polarizing flux for several cycles following the fault.
Of these statements

Question 7

Assertion (A): In power line communication, carrier frequency is chosen between 50 kHz and 500kHz.
Reason (R): No extra lines are necessary for the purpose and the same lines are used to carry both the electric power and information by carriers.

Question 8

What will be the total current flowing through the fuse, if 240W television, 720 W iron and 1440 W of mixers are used?

Question 9

What do you signify the condition of Overreach for an overcurrent relay ?

Question 10

Which type of connection is employed for current transformers for the protection of star-delta connected 3-phase transformer?

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ESE & GATE EE Power Systems

Jun 23ESE & GATE EE