| 1. | When a transmission line is energized, the wave that propagates on it is ? | |
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voltage wave only
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current wave only
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power factor wave only
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both (a) and (b)
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Report Question| 2. | Which of the following statements is incorrect ? | |
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An impedance relay has maximum fault current when fault occurs near the relay
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A high speed relay has an operation of 1 to 2 cycles
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Station batteries are used to operate relay only
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The lightning arresters are basically surge diverters
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| 3. | For which of the following ratings of the transformer differential protection is recommended ? | |
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equal to and above 5 MVA
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equal to and above 25 MVA
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none of the above
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above 30 kVA
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| 4. | The power loss is an important factor for the design of ? | |
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generator
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motor
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feeder
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transmission line
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| 5. | Which of the following circuit breakers will produce the least arc energy ? | |
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Plain oil circuit breaker
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Minimum oil circuit breaker
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Air blast circuit breaker
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None of the above
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| 6. | Buchholz's relay is ? | |
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located on the top of conservator tank
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part of circuit breaker installed near the transformer
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installed inside the breaker
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connected in the pipe connecting main tank of transformer and conservator
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| 7. | Basically a lightning arrester is a ? | |
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surge absorber
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surge diverter
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surge reflector
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surge alternator
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| 8. | Thermal relays are often employed in ? | |
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generator protection
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motor starters
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transformer protection
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none of the above
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| 9. | Which fuse material is more susceptible to oxidation as compared to the remaining ? | |
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Copper
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Tin lead alloy
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Silver
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None
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| 10. | In a circuit breaker ionisation is not facilitated by ? | |
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high temperature of surrounding
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increase of field strength
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material of contacts
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increase of mean path
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