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SSC JE EE Score Booster Quiz 7

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Question 1

Four alternators, each rated at 5 MVA, 11 kV, with 20% reactance are working in parallel. The short-circuit level at the bus-bars is

Question 2

For a protection of parallel transmission line

Question 3

The impedance per phase of a 3-phase transmission line on a base of 100 MVA and 100 kV is 2 p.u. The value of this impedance on a base of 400 MVA and 400 kV would be

Question 4

A symmetrical fault occurs on a power system. The percentage reactance of the system on 2500 base kVA is 25%. If the full-load current corresponding to base kVA is 20A, then short-circuit current is

Question 5

A 3-phase, 4-wire system supplies loads which are unequally distributed in the three phases. An analysis of the currents flowing in R, Y and B lines shows that in R line, positive phase sequence component is 200∠0^oA and the negative phase sequence component is 100∠60^oA. The total observed current flowing back to the supply in the neutral conductor is 300∠300^oA. The Zero-Phase sequence current R-line is

Question 6

Plug-setting multiplier is

Question 7

For the differential protection of power transformer (star\delta), the current transformer will have.

Question 8

In the low oil circuit breaker, the oil performs the function of

Question 9

Which is the most severe fault on an alternator ?

Question 10

The operation of distance relay depends upon

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ESE & GATE EE Power Systems

Feb 23ESE & GATE EE