# Power System3

1. A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

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2. When a line-to-ground fault occurs, the current in the phase is 100 A. The zero sequence current in the case will be

For L - G faults, Ia0 = Ia1 = Ia2 and Ia = 3Ia1.
So, Ia0 = ( Ia ) / 3 = ( 100 / 3 ) = 33.3 A.

3. The transient stability of the power system can be effectively improve by

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4. Reactance relay is normally used for protection against

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5. Hysteresis in an instrument means

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6. Admittance relay is a _____________________ type of relay.

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7. R.M.S. value and mean value both are the same in case of

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8. Resistance switching is normally employed in

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9. Two wattmeter reading are 1500 W and 700 W, what is there sum?

Sum of two wattmeter reading = addition of two individual reading, here sum = 1500 + 700 = 2200 W.

10. Insulation are provided in which type of transmission system?

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11. In overhead transmission system, ACSR conductor refers to

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12. Guess the widely used metal for overhead transmission?

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13. To reduce the adverse effect of corona discharge which conductor is specially used?

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14. In which transmission line capacitance effect is not considered?

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15. Underground cables are used in cities because

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16. Wiring safety codes are utilized to

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17. Earthing or grounding cable is typically colored

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18. Generally consumer distribution lines are tapped from where?

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19. Typically busbars are looks like

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20. Can you tell the respective color codes for phase and neutral wire?

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