Explore topic-wise MCQs in Transformers.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.

1.

Two single-phase furnaces let s say, A and B are supplied at 100 V by means of a Scott-connected transformer combination from a 3-phase 6600 V system. The voltage of furnace A is leading. Calculate on of the line current on the 3-phase side, when the furnace A takes 400 kW at 0.707 pf lagging and B takes 800 kW at unity pf.

A. 110 A
B. 99 A
C. 250 A
D. 149 A
Answer» C. 250 A
Discussion
2.

3/6-phase circuit is employed for providing DC path in some circuits.

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

In 3/6-phase connection of transformers _______________

A. Secondaries are two stars in phase sequence
B. Secondaries are two deltas in phase sequence
C. Secondaries are two stars in phase opposition
D. Secondaries are two deltas in phase opposition
Answer» D. Secondaries are two deltas in phase opposition
Discussion
4.

For 3/6-phase converter transformers __________

A. Scott connection is used
B. Each secondary winding is divided
C. Each primary winding is divided
D. Can t be done
Answer» C. Each primary winding is divided
Discussion
5.

In Scott connection, according to the vector diagram two windings are placed at ______________

A. At 1200 to each other
B. Perpendicular with respect to each other
C. At 600 to each other
D. Can t say
Answer» C. At 600 to each other
Discussion