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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 six
 two
 three
 one

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Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

  24.
 12.
 6.
 16.

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Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Sulphur hexafluoride CB
 Bulk oil type CB
 Air blast CB
 Vacuum CB

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Power Systems
Which of the following is/are the desirable properties of a insulator material?

 High relative permittivity
 High ratio of puncture strength to flash over.
 Low ratio of puncture strength to flash over.
 Both 1 and 2

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 -2 - j 1 A
 1 + j 4 A
 5 + j 7 A
 1 + j 2 A

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Power Systems
Maximum power capacity of a transmission line can be increased by

 either 1 or 2
 increasing voltage level
 nether 1 nor 2
 decreasing reactance value

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