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Objective Questions
ITI
Electrician
Electrician Set-1
Circuit Breakers
2

Circuit Breakers MCQ - Electrician (Set-1) with Answers

2) The fluids used in the circuit breakers should be of

high dielectric strength and thermal stability

non inflammable

arc extinguishing ability

all of the above

Answer is:

all of the above

Circuit Breakers MCQ - Electrician (Set-1) with Answers

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Related Circuit Breakers MCQ - Electrician (Set-1) with Answers

3) In a circuit breaker, the current that exists at the instant of contact separation is called the _____ current.

restriking

breaking

arc

recovery

Answer is:

breaking

4) In circuit breakers, oil as quenching medium has the advantage of

good cooling properties and absorption of arc energy

high dielectric strength

acting as an Insulator

all of the above

Answer is:

all of the above

5) Which one of the following circuit breakers are generally used in Railway electrification ?

Air blast circuit breaker

Minimum oil circuit breaker

Bulk oil circuit breaker

Sulphur hexafluoride circuit breaker

Answer is:

Air blast circuit breaker

6) Main purpose of oil in OCB is to

provide Insulation

provide cooling of contacts

quenching arc

none of the above

Answer is:

quenching arc

Circuit Breakers MCQ - Electrician (Set-1) with Answers

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