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AE-JE Foundation EE : Power Systems Quiz - 8

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Question 1

Which one of the following is used for communication with the aim of achieving high figure of merit of HVDC circuit breakers?

Question 2

A 50 Hz, 3- phase synchronous generator has inductance per phase of 15 mH. The capacitance of generator and circuit breaker is 0.002

F. What is its natural frequency of oscillatiohn?

Question 3

The resistance switching used in air blast breakers has the purpose of

Question 4

Consider the following circuit breakers for 220 kV substations:
1) Air
2) SF₆
3) Vacuum
Which of the above circuit breakers can be used in an indoor substation?

Question 5

Which information is correct for miniature circuit breaker?

Question 6

Which statement is incorrect for Oil Circuit Breaker?

Question 7

What is the preferred type of CB to be installed in extra high voltage ac system?

Question 8

Which of the following circuit breakers has the lowest voltage range?

Question 9

The correct statements regarding air blast circuit breaker are

1) External pressure vessel is required

2) ABCD are used for EHV applications

3) High air noise occurs More severe current chopping occurs

Question 10

The prospective voltage across the circuit breaker contacts for a given series inductance, L and shunt capacitance, C is

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Aug 12AE & JE Exams