Explore topic-wise MCQs in Power Systems.

This section includes 8 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.

A three phase transformer has a nameplate rating of 30 MVA, 230Y/69Y kV with a leakage -reactance of 10% and the transformer connection is wye-wye. Choosing a base of 30MVA and 230 kV on high voltage side, the transformer reactance referred to the low voltage side will be _______(in ohms).

A. 15.87
B. 157.8
C. 176.33
D. 17.67
Answer» B. 157.8
Discussion
2.

In impedance diagram different power system elements are represented by symbols.

A. True
B. False
Answer» C.
Discussion
3.

Single line diagram of which of the following power system is possible?

A. Power system with LLG fault
B. Power system with LG fault
C. Power system with LL fault
D. Balanced power system
Answer» E.
Discussion
4.

Single line diagram does not represents:

A. Star connection of transformer winding
B. Delta connection of transformer winding
C. Neutral wire of transmission lines
D. Ratings of machines
Answer» D. Ratings of machines
Discussion
5.

Reactance diagram contains which of the following ?

A. Resistance of Alternator
B. Resistance of transformer winding
C. Induction motor s equivalent corcuit
D. Inductive reactance of transmission lines
Answer» E.
Discussion
6.

Impedance diagram is used for analysis of __________

A. Load flow
B. Alternator
C. Fault
D. Transmission Line
Answer» B. Alternator
Discussion
7.

Which of the following is not neglected during formation of reactance diagram from impedance diagram?

A. Resistance of various power system components
B. Static loads
C. Shunt component of Transformers
D. Reactance of alternators
Answer» E.
Discussion
8.

What is the main purpose of reactance diagram?

A. Load flow analysis
B. Falt analysis
C. Calculation of ratings of Alternators
D. Calculation of ratings of Transformers
Answer» C. Calculation of ratings of Alternators
Discussion