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 2024 and IES 2024 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 ? |
Water |
Oil |
Air |
SF6 |
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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