Explore topic-wise MCQs in Design Electrical Machines.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Design Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the ideal condition with respect to the primary current rating?

A. ratio of secondary mmf to primary mmf should be high
B. ratio of secondary mmf to primary mmf should be low
C. ratio of excitation mmf to primary mmf should be high
D. ratio of excitation mmf to primary mmf should be low
Answer» E.
Discussion
2.

What are the disadvantages of the low rated secondary current transformer?

A. high cost
B. high voltages
C. high voltages or high cost
D. high voltages and high cost
Answer» E.
Discussion
3.

What is the value of the rated secondary current?

A. 1 A
B. 2 A
C. 3 A
D. 5 A
Answer» E.
Discussion
4.

The ring shaped cores are made use of in the reduction of the secondary winding leakage reactance and secondary impedance.

A. true
B. false
Answer» B. false
Discussion
5.

WHAT_IS_THE_VALUE_OF_THE_RATED_SECONDARY_CURRENT??$

A. 1 A
B. 2 A
C. 3 A
D. 5 A
Answer» E.
Discussion
6.

What is the ideal condition with respect to the primary current rating?$

A. ratio of secondary mmf to primary mmf should be high
B. ratio of secondary mmf to primary mmf should be low
C. ratio of excitation mmf to primary mmf should be high
D. ratio of excitation mmf to primary mmf should be low
Answer» E.
Discussion
7.

What_are_the_disadvantages_of_the_low_rated_secondary_current_transformer?$

A. high cost
B. high voltages
C. high voltages or high cost
D. high voltages and high cost
Answer» E.
Discussion
8.

What is the rating of the primary current in the current transformer?

A. 200 A
B. 300 A
C. 400 A
D. 500 A
Answer» E.
Discussion
9.

What should the magnetic path be in order to reduce the core reluctance?

A. length of the magnetic path in core should be low
B. length of the magnetic path in core should be medium
C. length of the magnetic path in core should be high
D. length of the magnetic path in core should be very high
Answer» B. length of the magnetic path in core should be medium
Discussion
10.

What type of core is employed when the performance standard required is not so high?

A. rectangular strips
B. c-shaped sections
C. rectangular strips or c-shaped sections
D. rectangular strips and c-shaped sections
Answer» D. rectangular strips and c-shaped sections
Discussion
11.

The ring shaped cores are made use of in the reduction of the secondary winding leakage reactance and secondary impedance?

A. true
B. false
Answer» B. false
Discussion
12.

What is the relation of the secondary winding leakage reactance and secondary circuit impedance?

A. secondary winding leakage reactance is directly proportional to the secondary circuit impedance
B. secondary winding leakage reactance is indirectly proportional to the secondary circuit impedance
C. secondary winding leakage reactance is directly proportional to the square of the secondary circuit impedance
D. secondary winding leakage reactance is indirectly proportional to the square of the secondary circuit impedance
Answer» B. secondary winding leakage reactance is indirectly proportional to the secondary circuit impedance
Discussion
13.

What is the material used in the transformer when the transformer errors should be small?

A. mumetal cores
B. steel cores
C. permender cores
D. presshamn cores
Answer» B. steel cores
Discussion
14.

How many classifications are the magnetic alloys used in the current transformers classified into?

A. 3
B. 2
C. 4
D. 5
Answer» B. 2
Discussion
15.

What should be done in order to reduce the errors in the core?

A. armature mmf is to kept low
B. field mmf to be kept high
C. the exciting mmf is to be kept low
D. the field mmf is to be kept high
Answer» D. the field mmf is to be kept high
Discussion
16.

How many design principles are present in the current transformers?

A. 2
B. 3
C. 4
D. 5
Answer» E.
Discussion