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 |
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