Explore topic-wise MCQs in Electrical Machines.

This section includes 5 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.

For the same rating machines, which of the following statement is correct regarding the efficiency ( )?

A. of low speed machine > of high speed machine
B. of low speed machine < of high speed machine
C. of low speed machine = of high speed machine
D. Any of the mentioned
Answer» C. of low speed machine = of high speed machine
Discussion
2.

The electromechanical energy conversion devices used in power systems are never operated to deliver maximum power output because at maximum power output _____________

A. Efficiency is less than 50%
B. Temperature of the power devices is much more than the specified allowable temperature rise
C. Half of the power input appears as losses
D. Any of the mentioned
Answer» C. Half of the power input appears as losses
Discussion
3.

Which of the given losses are directly proportional to square of speed?

A. Windage loss
B. Eddy current loss
C. Both Windage and eddy current loss
D. Hysteresis loss and brush loss
Answer» D. Hysteresis loss and brush loss
Discussion
4.

In an induction motor, which of the following is correct?

A. Stator core loss < rotor core loss
B. Stator core loss = rotor core loss
C. Stator core loss > rotor core loss
D. Any of the mentioned
Answer» D. Any of the mentioned
Discussion
5.

A consideration of the power losses in electrical machines is essential for which of the following reasons?

A. Operating cost
B. Temperature rise
C. Voltage drops
D. All of the mentioned
Answer» E.
Discussion