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ESE 2021 Technical Quiz || Switchgear & Protection 3

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Question 1

A 50 Hz, 3- phase synchronous generator has inductance per phase of 15 mH. The capacitance of generator and circuit breaker is 0.002F. What is its natural frequency of oscillatiohn?

Question 2

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 3

Two insulations discs of identical capacitance value C make up a string for 2 kV, 50 Hz, single phase head line insulation system. If pin to earth capacitance is also C, then what is the string efficiency?

Question 4

Which of the following is not true for reactance relay?

Question 5

Each of the next items consist of two statements, one labeled as ‘Statement (I)’ and other as Statement (II). You are to examine these two statements carefully and select the answers to these items using the codes gives below.

Statement (I): Lightning arrestor is used for the protection of equipment at the substations against lightning.

Statement (II): During normal operation, it offers high impedance between live and earth terminals but when lightning occurs, it provides low impedance and diverts those surge to ground.

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May 26ESE & GATE EE