Electrical Engineering Questions And Answers :: Switchgear Protections: part1

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Electrical Engineering : Switchgear Protections QUESTIONS AND ANSWERS :: part1 : 16 to 20

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

16.Thermal circuit breaker has

delayed trip action
instantaneous trip action
both of the above
none of the above

17.Which of the following medium is employed for extinction of arc in air circuit breaker ?


18.Air blast circuit breaker is used for

over currents
short duty
intermittant duty
repeated duty

19.The current zero interruption, in oil and air blast circuit breakers, is achieved by

lengthening of the gap
cooling and blast effect
both (a) and (b)
deionizing the oil with forced air

20.The relay operating speed depends upon

the spring tension
the rate of flux built up
armature core air gap
all of the above

More Switchgear Protections QUESTIONS AND ANSWERS available in next pages

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