Explore topic-wise MCQs in Dc Machines.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Dc Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

Formula for cancellation of reactance voltage on an average basis using interpoles ________

A. 2[B<sub>i</sub>(av)l<sub>i</sub>v<sub>a</sub>] N<sub>c</sub> = L<sub>c</sub> (di<sub>c</sub>/dt) = L<sub>c</sub> (2l<sub>c</sub>/t<sub>c</sub>)
B. [B<sub>i</sub>(av)l<sub>i</sub>v<sub>a</sub>] N<sub>c</sub> = L<sub>c</sub> (di<sub>c</sub>/dt) = L<sub>c</sub> (2l<sub>c</sub>/t<sub>c</sub>)
C. 2[B<sub>i</sub>(av)l<sub>i</sub>v<sub>a</sub>] N<sub>c</sub> = L<sub>c</sub> (di<sub>c</sub>/dt) = L<sub>c</sub> (l<sub>c</sub>/t<sub>c</sub>)
D. Cannot be determined
Answer» B. [B<sub>i</sub>(av)l<sub>i</sub>v<sub>a</sub>] N<sub>c</sub> = L<sub>c</sub> (di<sub>c</sub>/dt) = L<sub>c</sub> (2l<sub>c</sub>/t<sub>c</sub>)
Discussion
2.

What is the size of interpolar air gap compare to main pole air gap?

A. Small
B. Same
C. More
D. Can be of any size
Answer» D. Can be of any size
Discussion
3.

Polarity of interpoles is one pole ahead in the direction of armature rotation in _____________

A. Motor
B. Generator
C. Always ahead
D. Always behind
Answer» C. Always ahead
Discussion
4.

Interpoles are excited by keeping them in ____________ with armature.

A. Series
B. Parallel
C. Anywhere
D. Not kept with armature
Answer» B. Parallel
Discussion