Circuit Breakers — 3 | Objective Type Question Answers

#1 For a high speed circuit breaker the total clearing time is nearly

1 to 2 cycles

#2 If the power factor is zero, the active recovery voltage will be

maximum

#3 Which of the following circuit breaker will produce the least arc energy

Air blast circuit breaker

#4 For a circuit breaker ‘break time’ is

opening time + arc duration + resistor current duration

#5 The breaking capacity of a circuit breaker in MVA (3 phase) is given by

√3 x rated service voltage x rated symmetrical current

#6 Which relay is used for feeders?

Translay relay

#7 MHO relay is used for

transmission lines

#8 Merz Price protection is used on

generators

#9 The advantage of neutral earthing is

all of the above

#10 The protection against over-voltage due to lightening is provided by

any of the above

#11 Which of the following is a conducting medium for electric current?

plasma

#12 In circuit breakers the contact space is ionized by

any of the above

#13 Which of the following statement about SF6 gas is incorrect?

it has dark yellow color

#14 SF6 gas is transported in

liquid form in cylinders

#15 SF6 gas is transported in

liquid form in cylinders

#16 During arc extinction SF6 gas

decomposes into SF4 and SF2

#17 Dielectric strength of SF6 is

less than that of oil used in OCB

#18 Which of the following is demerit of SF6 circuit breaker?

all of the above

#19 Sphere gaps are used for

all of the above

next

#20 Which of the following is not valid in case of aluminum as compared to copper? Aluminum has higher

tensile strength

#21 The isolator is interlocked with circuit breaker and earthing switch. While opening the circuit, ……. opens first, then the …… and only after this …… can close.

circuit breaker, isolator, earthing switch

finish

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Electrical Engineering MCQ Question Answer

 
On my blog, I have started this new section “Electrical Engineering MCQ Question Answer” on the repeated demand on my readers. I hope this section will prove helpful for electrical engineering students who are preparing for different competitive exams.

Electrical Engineering MCQ Question Answer

 
Electrical engineering mcq question answer are finding favor with various examining organizations. These tests generally contain multiple choice questions in which four or five possible answers are offered and the job of an examinee is to select only the best answer. Sometimes the incorrect answers provided are partially correct. These partially true choices are inserted to force the candidate to think and establish that he knows the correct answer.

  • Hints for Identifying the Correct Answer
  • Read the item closely to see what the examiner is after.
  • Re-read if necessary.
  • Mentally reject answers that are clearly wrong.
  • Identify the most correct answer.
  • In the case of items where you are doubtful of the answer, you might be able to bring to bear the information you have gained from your previous study. This knowledge might be sufficient to indicate that some of the suggested answers are not so plausible. Eliminate such answers from further consideration.
  • Then concentrate on the remaining suggested answers. The more you eliminate in this way, the better your chances of getting the right item.
  • The pressure of time compels for speedy identification of correct answers. If you have identified the correct answer, switch over to the next question.
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