| 1. | SF6 gas is transported in ? | |
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solid form in boxes
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gas cylinders
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air cylinders
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liquid form in cylinders
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Report Question| 2. | Least number of faults are generally reported for ? | |
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transmission lines
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transformers
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cables
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switch gears
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| 3. | An earth conductor provided on the top of the transmission line provides protection against ? | |
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travelling waves
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electrostatically induced voltage due to a charged cloud
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direct lightning stroke
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all of the above
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| 4. | The transient voltage that appears across the contacts at the instant of arc extinction is called voltage ? | |
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restriking
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supply
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peak
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recovery
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| 5. | The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to ? | |
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insulate the contacts from switch body
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Extinguish the arc
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lubricate the contacts
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all of the above
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| 6. | To protect most of the electrical equipment handling low power, the types of relays used are ? | |
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electronic and bimetallic
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thermocouple
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both (a) and (b)
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none of the above
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| 7. | The current zero interruption, in oil and air blast circuit breakers, is achieved by ? | |
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cooling and blast effect
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lengthening of the gap
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deionizing the oil with forced air
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both (a) and (b)
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| 8. | In Railway applications ........ circuit breaker is used ? | |
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bulk oil
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air break
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SF6
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minimum oil
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| 9. | When a wave propagates on a transmission line, it suffers reflection several times at ? | |
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load end
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tapping
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sending and other end
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sending end
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| 10. | The short circuit in any winding of the transformer is the result of ? | |
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impulse voltage
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loose connection
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mechanical vibration
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insulation failure
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