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UPPCL AE EE : Power Systems Quiz 5

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Question 1

Consider the single line diagram shown in the figure below. Thevenin equivalent impedance with respect to motor bus is ____pu.

Take positive sequence impedance of generator = j0.4 pu

Positive sequence impedance of motor = j0.4 pu

Positive sequence impedance of line = j0.4 pu

Question 2

The positive sequence impedance component of three unequal impedances Z_a, Z_b and Z_c is

Question 3

For a single-line to ground fault, the terminal conditions are

Question 4

Symmetrical components are used in power system for the analysis of

Question 5

Which one of the following statements is correct regarding fault analysis?

Question 6

For a solidly grounded synchronous generator, if line to ground (LG) fault current is more than the 3-phase fault current, then, which of the following options is correct? (X₀, X₁, X₂ have their usual meaning)

Question 7

If X₁ = X₂≫ X₀, (where X₀, X₁, X₂ have their usual meaning), then:

1. 3-phase fault as compared to L-G fault will be more severe.

2. L-G fault as compared to 3-phase fault will be more severe.

Choose the correct option:

Question 8

The three sequence voltages at the point of fault in a power system are found to be equal. The nature of the fault is

Question 9

Statement (I): in case of line to line fault (LL fault) zero. Sequence voltage is maximum.

Statement (II): Line to line fault (LL fault) is not associated with grounds.

Question 10

Before fault occurs at point (P) in the power system shown below, ____ pu of maximum power is transferred from sending to receiving end?

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