Explore topic-wise MCQs in Transformers.

This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.

1.

A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. tWhat will be the rating of auto transformer?

A. 500 VA
B. 550 VA
C. 100 VA
D. 110 VA
Answer» C. 100 VA
Discussion
2.

What are the modes in which power can be transferred in an autotransformer?

A. Conduction
B. Induction
C. Conduction and Induction
D. Cannot be said
Answer» D. Cannot be said
Discussion
3.

For an auto-transformation ratio tending to the unity value, saving of the conductor material will be ___________

A. Tend towards 90% or more
B. Tend towards 0%
C. Can’t say
D. Wil remain fix
Answer» B. Tend towards 0%
Discussion
4.

Ratio of winding material needed for autotransformer to thr two winding transformer is ______

A. 1- V2/V1
B. 1- N2/N1
C. 1- V2/V1 and 1- N2/N1
D. 1- V1/V2
Answer» D. 1- V1/V2
Discussion
5.

An autotransformer compared to its two-winding counterpart has a higher operating efficiency.

A. True
B. False
Answer» B. False
Discussion
6.

RATIO_OF_WINDING_MATERIAL_NEEDED_FOR_AUTOTRANSFORMER_TO_THR_TWO_WINDING_TRANSFORMER_IS_______?$

A. 1- V<sub>2</sub>/V<sub>1</sub>
B. 1- N<sub>2</sub>/N<sub>1</sub>
C. 1- V<sub>2</sub>/V<sub>1</sub> and 1- N<sub>2</sub>/N<sub>1</sub>
D. 1- V<sub>1</sub>/V<sub>2</sub>
Answer» D. 1- V<sub>1</sub>/V<sub>2</sub>
Discussion
7.

What are the modes in which power can be transferred in an autotransformer?$

A. Conduction
B. Induction
C. Conduction and Induction
D. Cannot be said
Answer» D. Cannot be said
Discussion
8.

For_an_auto-transformation_ratio_tending_to_the_unity_value,_saving_of_the_conductor_material_will_be____________$

A. Tend towards 90% or more
B. Tend towards 0%
C. Can’t say
D. Wil remain fix
Answer» B. Tend towards 0%
Discussion
9.

For a 20kVA transformer with turn ratio 0.4 what amount of total power is transferred conductively?

A. 8kVA
B. 12kVA
C. 10kVA
D. 50kVA
Answer» B. 12kVA
Discussion
10.

For a 20kVA transformer with turn ratio 0.4 what amount of total power is transferred inductively?

A. 8kVA
B. 12kVA
C. 10kVA
D. 50kVA
Answer» C. 10kVA
Discussion
11.

A_100/10,_50_VA_double_winding_transformer_is_converted_to_100/110_V_auto_transformer._tWhat_will_be_the_rating_of_auto_transformer?

A. 500 VA
B. 550 VA
C. 100 VA
D. 110 VA
Answer» C. 100 VA
Discussion
12.

An autotransformer compared to its two-winding counterpart has a higher operating efficiency?

A. True
B. False
Answer» B. False
Discussion
13.

When auto-transformation ratio becomes equal to 1, which of the following statement is true?

A. VA rating of the autotransformer becomes far greater than VA rating of two winding transformer
B. VA rating of the autotransformer becomes far lower than VA rating of two winding transformer
C. VA rating of the autotransformer becomes equal to VA rating of two winding transformer
D. Can’t comment
Answer» B. VA rating of the autotransformer becomes far lower than VA rating of two winding transformer
Discussion
14.

Two-winding transformer of a given VA rating if connected as an autotransformer can handle ___________

A. Higher VA
B. Lower VA
C. Same VA
D. Cannot be found
Answer» B. Lower VA
Discussion
15.

Which of the following is not true regarding the autotransformer compare to two-winding transformer?

A. Lower reactance
B. Lower losses
C. Higher exciting current
D. Better voltage regulation
Answer» D. Better voltage regulation
Discussion
16.

Autotransformers are particularly economical when _________

A. Voltage ratio is less than 2
B. Voltage ratio is very high
C. Voltage ratio is higher than 2 in smaller range
D. Can be used anywhere
Answer» B. Voltage ratio is very high
Discussion
17.

Total windings present in a autotransformer are __________

A. 1
B. 2
C. 3
D. 4
Answer» B. 2
Discussion
18.

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

A. Approximately equal to one
B. Less than one
C. Great than one
D. Cannot be found
Answer» B. Less than one
Discussion
19.

Which of the following is the main advantage of an auto-transformer over a two-winding transformer?

A. Hysteresis losses are reduced
B. Saving in winding material
C. Copper losses are negligible
D. Eddy losses are totally eliminated
Answer» C. Copper losses are negligible
Discussion