Multiple choice questions machines

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. Top of Form

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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? 5.25 V 13 V 25 V 33 V

What is normally used to convert the alternating voltage produced by rotating a coil in a magnetic field, into a direct voltage? A semiconductor rectifier. A commutator. A regulator. A transformer.

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

The commutator. The field coils. The armature windings. The armature.

In the diagram of the previous question, what is indicated by the label 'Y'? The armature windings.

The armature. The field coils. The commutator.

In the following diagram of an alternator, what is indicated by the label The 'Z'?slip rings. The armature windings. The brushes. The field coils.

In the diagram of the previous question, what is indicated by the label 'W'? The field coils.

The armature windings. The brushes. The slip rings.

A six-pole alternator is required to operate at 50 Hz. What is the required rotation speed? 17 rpm 50 rpm 1000 rpm 3000 rpm

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

180 rpm 3,600 rpm 10,800 rpm

What form of motor is shown here?

A synchronous AC motor. A shunt-wound DC motor. DC permanent magnet motor. A squirrel-cage induction motor.

Power generation is dominated by DC machines, particularly in highpower applications. True False Bottom of Form

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? Your 33 V Answer:

2.

What is normally used to convert the alternating voltage produced by rotating a coil in a magnetic field, into a direct voltage? Your Answer: A regulator. Correct A commutator. Answer:

3.

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

Your Answer: The armature. Correct The field coils. Answer:

4.

In the diagram of the previous question, what is indicated by the label 'Y'? Your The commutator. Answer:

5.

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

Your Answer: The brushes. Correct The armature windings. Answer:

6.

In the diagram of the previous question, what is indicated by the label 'W'? Your Answer: The brushes. Correct The slip rings. Answer:

7.

A six-pole alternator is required to operate at 50 Hz. What is the required rotation speed? Your 1000 rpm Answer:

8.

What is the rotation speed of a six-pole synchronous motor when used with a single-phase 60 Hz supply? Your Answer: 180 rpm Correct 10,800 rpm Answer:

9.

What form of motor is shown here?

Your Answer: A shunt-wound DC motor. Correct A squirrel-cage induction motor. Answer:

10 .

Power generation is dominated by DC machines, particularly in high-power applications. Your False Answer: