Explore topic-wise MCQs in Power Systems.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Power Systems knowledge and support exam preparation. Choose a topic below to get started.

1.

Surge impedance for 400ohms implies for a transmission line that ___________

A. line can be theoretically loaded up to 400ohms
B. line can be practically loaded up to 400ohms
C. open circuit impedance of 400ohms
D. short circuit impedance of 400ohms
Answer» B. line can be practically loaded up to 400ohms
Discussion
2.

Estimate the transmission line parameters (ABCD), for the given distributed network and find AB-CD.

A. 1
B. Y
C. Y-Z1Z2
D. 0
Answer» B. Y
Discussion
3.

With 100% series compensation of the transmission lines, which of the following effects are not observed?(i) Low transient voltage(ii) High transient current(iii) The current is series resonant at power frequency

A. (ii), (iii)
B. (i)
C. (i), (ii), (iii)
D. (iii)
Answer» C. (i), (ii), (iii)
Discussion
4.

With 100% series compensation of the transmission lines, which of the following effects are observed?(i) Low transient voltage(ii) High transient current(iii) The current is series resonant at power frequency

A. (ii), (iii)
B. (i), (ii)
C. (i), (ii), (iii)
D. (iii)
Answer» B. (i), (ii)
Discussion
5.

For a medium transmission line system if the sending end line voltage is 143 kV with the line impedance as 101.24∠74° Ω and shunt admittance of 7.38*10-4∠90° Ω-1.Then the no load line voltage at the receiving end would be _________

A. 148.3 kV
B. 140.8 kV
C. 149.2 kV
D. 132 kV
Answer» B. 140.8 kV
Discussion
6.

For the circuit representation of a transmission line below, the transmission line T-matrix will be . Then AB – CD value will be _________

A. Y
B. 1
C. -Y
D. 1-Y
Answer» B. 1
Discussion
7.

Nominal-T and nominal-π are equivalent to each other.

A. True
B. False
Answer» C.
Discussion
8.

WITH_100%_SERIES_COMPENSATION_OF_THE_TRANSMISSION_LINES,_WHICH_OF_THE_FOLLOWING_EFFECTS_ARE_OBSERVED??$

A. Low transient voltage
B. High transient current
C. The current is series resonant at power frequency
D. (ii), (iii)
Answer» B. High transient current
Discussion
9.

With_100%_series_compensation_of_the_transmission_lines,_which_of_the_following_effects_are_not_observed?$

A. Low transient voltage
B. High transient current
C. The current is series resonant at power frequency
D. (ii), (iii)
Answer» C. The current is series resonant at power frequency
Discussion
10.

Surge impedance for 400ohms implies for a transmission line that ___________

A. line can be theoretically loaded up to 400ohms
B. line can be practically loaded up to 400ohms
C. open circuit impedance of 400ohms
D. short circuit impedance of 400ohms
Answer» B. line can be practically loaded up to 400ohms
Discussion
11.

Which of the parameters of a long transmission line and medium transmission lines are same?

A. A and D
B. B, C
C. Only A
D. Only D
Answer» B. B, C
Discussion
12.

For the lines more than 250 km, the parameters of a line are considered not ______ but _____

A. lumped , distributed
B. distributed, lumped
C. lumped, non uniform lumped
D. uniform, lumped
Answer» B. distributed, lumped
Discussion
13.

For a medium transmission line system if the sending end line voltage is 143 kV with the line impedance as 101.24∠74° Ω and shunt admittance of 7.38*10-4∠90° Ω-1 delivering 25 MVA at 0.8 power factor lagging in nature to the load at 132 kV. The voltage regulation is ___________$

A. 12.3
B. 12.8
C. 14.2
D. -2.3
Answer» B. 12.8
Discussion
14.

For a medium transmission line system if the sending end line voltage is 143 kV with the line impedance as 101.24∠74° Ω and shunt admittance of 7.38*10-4∠90° Ω-1.Then the no load line voltage at the receiving end would be _________$

A. 148.3 kV
B. 140.8 kV
C. 149.2 kV
D. 132 kV
Answer» B. 140.8 kV
Discussion
15.

The transfer of the reactive power over a line mainly depends upon _____

A. Vr
B. Vs
C. |V<sub>s</sub>| – |V<sub>r</sub>|
D. Power angle
Answer» D. Power angle
Discussion
16.

Nominal-T and nominal-π are equivalent to each other.

A. True
B. False
Answer» C.
Discussion