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AE-JE Foundation EE : Power Systems Quiz - 7

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Question 1

When the sinusoidal steady state current is called the symmetrical short circuit current, then the unidirectional transient component is called

Question 2

Series reactors are used to

Question 3

__________ is a series type unbalanced fault that occurs in a power system.

Question 4

The zero-sequence current of a generator for line to ground fault is j4 pu. Then the current through the neutral during the fault is

Question 5

For which of the following type of fault, all the three sequence networks are connected parallel to each other?

Question 6

The maximum permissible time of de-energization of the faulty circuit is dependent on

Question 7

The vector sum of positive sequence currents is ?

Question 8

An unloaded generator with a pre-fault voltage of 1 p.u. has following sequence impedances: Z₀ = j0.08 p.u., Z₁ = Z₂ = j0.30 p.u. The neutral is grounded with a reactance of 0.04 p.u. If a line to ground fault occurs at the terminal of the generator, then the fault current is

Question 9

The most common type of unsymmetrical faults in three phase system is

Question 10

A 3-phase, 100 MVA, 11 kV generator has the following p.u. constants. The generator neutral is solidly grounded. X₁ = X₂ = 3X₀ = 0.15Ω. The ratio of the fault current due to three-phase dead-short-circuit to that due to L-G fault would be nearly

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