Explore topic-wise MCQs in Transformers.

This section includes 15 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
6.

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
7.

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
8.

3/6-phase_circuit_is_employed_for_providing_DC_path_in_some_circuits.$

A. True
B. False
Answer» B. False
Discussion
9.

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
10.

For single-phase to three-phase change in transformer which of the following connection is most suitable?

A. Scott connection
B. Scott connection with resistor network
C. Scott connection with some energy storing device
D. Any of the mentioned
Answer» D. Any of the mentioned
Discussion
11.

In Scott connection neutral point is located at _______________

A. Three phase side at teaser
B. Two-phase side
C. Three phase side secondary
D. Anywhere
Answer» B. Two-phase side
Discussion
12.

The secondaries of two transformers are in ratio ____

A. 1:1
B. ‚àö3/2: 1
C. ‚àö3: 1
D. ‚àö2: 1
Answer» B. ‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ3/2: 1
Discussion
13.

The primaries of two transformers in Scott connection are in turns ratio of ___________

A. ‚àö3/2: 1
B. 2/‚àö3: ‚àö2
C. 1:1
D. Can’t say
Answer» B. 2/‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ3: ‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ2
Discussion
14.

What is the ratio of voltage/turn of two windings of a transformer in operated in Scott connection?

A. ¬Ω
B. 1/‚àö2
C. 1
D. 1/‚àö3
Answer» D. 1/‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ3
Discussion
15.

Only Scott connection is used for _________

A. Converting three-phase to two-phase conversion
B. Converting three-phase to single-phase conversion
C. Converting single-phase to two-phase conversion
D. None of the mentioned
Answer» B. Converting three-phase to single-phase conversion
Discussion