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Home  arrow Student Resources  arrow Chapter 23: Electric Motors and Generators  arrow Multiple choice questions

Multiple choice questions

Try the following questions to test your knowledge of Chapter 23. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results.

This activity contains 10 questions.

Question 1.
A coil consisting of 50 turns of copper wire has an area of 30 cm2. Determine the peak magnitude of the sinusoidal voltage produced across the terminals of the coil if it rotates within a magnetic field of 700 mT at a rate of 3000 rpm?

End of Question 1

Question 2.
What is normally used to convert the alternating voltage produced by rotating a coil in a magnetic field, into a direct voltage?

End of Question 2

Question 3.
In the following diagram of a DC generator, what is indicated by the label 'X'?


End of Question 3

Question 4.
In the diagram of the previous question, what is indicated by the label 'Y'?

End of Question 4

Question 5.
In the following diagram of an alternator, what is indicated by the label 'Z'?


End of Question 5

Question 6.
In the diagram of the previous question, what is indicated by the label 'W'?

End of Question 6

Question 7.
A six-pole alternator is required to operate at 50 Hz. What is the required rotation speed?

End of Question 7

Question 8.
What is the rotation speed of a six-pole synchronous motor when used with a single-phase 60 Hz supply?

End of Question 8

Question 9.
What form of motor is shown here?


End of Question 9

Question 10.
Power generation is dominated by DC machines, particularly in high-power applications.

End of Question 10

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