| 1. | Which of the following parameter can be neglected for a short line ? | |
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Reactance
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Resistance
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Capacitance
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Inductance
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Report Question| 2. | Bus coupler is very essential in ...... arrangement ? | |
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main and transfer bus
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double bus, double breaker
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single bus
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all of the above
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| 3. | The interaction between a transmission line and communication line is minimized by ? | |
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increasing the distance between the two lines
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transporting transmission as well as communication lines
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increasing the height of the transmission line tower
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All of the above
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| 4. | Interruption of large currents by relay requires ? | |
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wide separation of the opened contacts
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high speed opening of contacts
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arc suppressing blow out coils
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all of the above
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| 5. | In order that current should flow without causing excessive heating or voltage drop, the relay contacts should ? | |
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be of sufficient size and proper shape
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have all above properties
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be clean and smooth
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have low contact resistance
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| 6. | Thermal circuit breaker has ? | |
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instantaneous trip action
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delayed trip action
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both of the above
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none of the above
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| 7. | The arcing contacts in a circuit breaker, are made of ? | |
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porcelain
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aluminium alloy
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copper tungsten alloy
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electrolytic copper
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| 8. | The main function of a fuse is to ? | |
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protect the appliance
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prevent excessive currents
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protect the line
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open the circuit
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| 9. | Arc in a circuit behaves as ? | |
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an inductive reactance
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a resistance decreasing with voltage rise across the arc
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a capacitive reactance
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a resistance increasing with voltage rise across the arc
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| 10. | Circuit breakers usually operate under ? | |
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after dc component has ceased
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sub-transient state of short-circuit current
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transient state of short-circuit current
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steady state of short-circuit current
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