| 1. | The inverse definite mean time relays are used for over current and earth fault protection of transformer against ? | |
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heavy loads
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all of the mention
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internal short-circuits
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external short-circuits
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Report Question| 2. | Admittance relay is ..... relay ? | |
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non-directional
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impedance
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directional
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none of the above
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| 3. | On which of the following effects of electric current a fuse operates ? | |
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Magnetic effect
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Photoelectric effect
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Electrostatic effect
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Heating effect
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| 4. | A fuse in a motor circuit provides protection against ? | |
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short-circuit and over load
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open circuit, short-circuit and overload
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overload
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none of the above
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| 5. | In a single bus-bar system there will be complete shut down when ? | |
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fault occurs with respect to earthing
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fault occurs on the bus itself
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fault occurs on neutral line
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two or more faults occur simultaneously
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| 6. | The pilot relay is provided to obtain ? | |
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delayed tripping
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High speed tripping
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preset tripping
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none of the above
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| 7. | Reactance relays are used for phase in ........ line ? | |
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long
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medium
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short
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all of the above
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| 8. | On which of the following routine tests are conducted ? | |
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Minimum oil circuit breakers
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Air blast circuit breakers
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Oil circuit breakers
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All of the above
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| 9. | Insulation resistance of high voltage circuit breakers is more than ? | |
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100 mega ohms
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1 mega ohms
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500 mega ohms
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10 mega ohms
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| 10. | The relay with inverse time characteristic will operate within ? | |
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20 to 30 sec
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1.5 sec
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5 to 10 sec
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5 to 20 sec
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