Explore topic-wise MCQs in Electrical Machines.

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

1.

In a DC motor, the commutator serves as a ___________

A. mechanical rectifier for alternating EMF to direct EMF
B. mechanical inverter to invert the direct applied voltage to alternating voltage
C. all of the mentioned
D. none of the mentioned
Answer» C. all of the mentioned
Discussion
2.

In a DC generator, the commutator serves as a _________

A. mechanical rectifier for alternating EMF to direct EMF
B. mechanical inverter to invert the direct applied voltage to alternating voltage
C. all of the mentioned
D. none of the mentioned
Answer» B. mechanical inverter to invert the direct applied voltage to alternating voltage
Discussion
3.

In larger DC machines, the reason behind using fabricated steel instead of cast iron in the manufacture of yoke is?

A. economical considerations
B. permeability considerations
C. mechanical considerations
D. insulation considerations
Answer» C. mechanical considerations
Discussion
4.

In a synchronous generator, the frequency of the generated EMF depends on ___________

A. rotational speed
B. poles
C. both rotational speed and poles
D. none of the mentioned
Answer» D. none of the mentioned
Discussion