Explore topic-wise MCQs in Transformers.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.

1.

How impedance of particular winding can be calculated?

A. Z<sub>1</sub>= Z<sub>12</sub>+Z<sub>13</sub>+Z<sub>23</sub>
B. Z<sub>1</sub>= 1/2¬Ω (Z<sub>12</sub>+Z<sub>13</sub>-Z<sub>23</sub>)
C. Z<sub>1</sub>= Z<sub>12</sub>-Z<sub>13</sub>+Z<sub>23</sub>
D. Z<sub>1</sub>= Z<sub>12</sub>+Z<sub>13</sub>-Z<sub>23</sub>
Answer» D. Z<sub>1</sub>= Z<sub>12</sub>+Z<sub>13</sub>-Z<sub>23</sub>
Discussion
2.

Simple phase equivalent circuit of three winding transformer can be shown as ____________

A. simple star network
B. simple parallel network
C. simple series network
D. can be shown accordingly
Answer» B. simple parallel network
Discussion
3.

Which currents flow through the delta-connected tertiary winding?

A. Positive sequence currents
B. Negative sequence currents
C. Zero sequence currents
D. All sequence currents
Answer» D. All sequence currents
Discussion
4.

Any unbalanced load can be divided into _______________

A. positive and negative sequence components
B. positive, negative and zero sequence components
C. only in positive and zero sequence components
D. only in negative and zero sequence components
Answer» C. only in positive and zero sequence components
Discussion
5.

Tertiary winding can be used for ____________

A. to maximize the core area
B. to measure voltage during HV testing of transformer
C. to fill up the space between primary and secondary windings
D. to measure voltage during open circuit testing of transformer
Answer» C. to fill up the space between primary and secondary windings
Discussion
6.

Tertiary winding allows the flow of _______________

A. third harmonic currents
B. fifth harmonic currents
C. seventh harmonic currents
D. eleventh harmonic currents
Answer» B. fifth harmonic currents
Discussion
7.

Tertiary winding is generally _________

A. star connected
B. delta connected
C. open-delta connected
D. star or open-delta connected
Answer» C. open-delta connected
Discussion
8.

Why tertiary winding is used?

A. To make circuit stable
B. To provide voltage supply to the substations different from the primary and secondary voltage levels
C. To connect static capacitors for reactive power injection
D. Stable circuit, different voltage output, static capacitor connection
Answer» E.
Discussion
9.

Three winding and two winding transformers work on same working principle.

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