| 1. | Over voltage protection is recommended for ? | |
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gas turbine generators
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hydro-electric generators
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steam turbine generators
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all of the above
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Report Question| 2. | Air blast circuit breakers for 400 kV power system are designed to operate ln ? | |
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0.5 sec
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0.1 sec
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100 micro-second
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milli-second
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| 3. | The material used for fuse must have ? | |
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high melting point and low specific resistance
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low melting point and any specific resistance
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low melting point and low specific resistance
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low melting point and high specific resistance
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| 4. | The steady state stability of the power system can be increased by ? | |
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using machines of high impedance
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connecting lines in parallel
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reducing the excitation of machines
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connecting lines in series
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| 5. | An isolator is installed ? | |
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always independent of the position of circuit breaker
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generally on both sides of a circuit breaker
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as a substitute for circuit breaker
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to operate the relay of circuit breaker
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| 6. | A switchgear is device used for ? | |
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switching and controlling an electrical circuit
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switching, controlling and protecting the electrical circuit and equipment
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interrupting an electrical circuit
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switching an electrical circuit
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| 7. | The fuse wire, in D.C. circuits, is inserted in ? | |
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Positive circuit only
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negative circuit only
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both (a) and (b)
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either (a) and (b)
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| 8. | A circuit breaker, under normal conditions, should be inspected ? | |
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every week
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once in 6 months or 12 months
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every day
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every month
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| 9. | The total time for high speed breakers in nearly ? | |
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five cycles
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one cycle
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half cycle
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few cycles
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| 10. | ...... gives rise to symmetrical fault ? | |
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Three-phase short-circuit
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Phase-to-phase
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double phase to ground
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Single phase to ground
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