Here is the "Electricity - Basic Navy Training Courses"
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Table of
Contents. • U.S. Government Printing Office; 1945 - 618779
Chapter 14 QUIZ
GENERATORS
1. Name the two essential circuits of a generator. Briefly describe the
parts of each.
2. When is the induced voltage of a coil zero?
3. When is the induced voltage of a rotating coil at its maximum value?
4. Is a.c. or d.c. produced inside a rotating coil?
5. How is d.c. obtained from a rotating coil ?
6. Adding coils to an armature does what to the. d.c. produced?
7. What connection is used between coils of an armature to produce a high and
even voltage?
8. Why is a drum winding superior to a ring winding?
9. Distinguish between the stator and the rotor of an alternator.
10. Why are a-c machines designed opposite to d-c machines?
Chapter 14 ANSWERS
GENERATORS
1. Primary-pole pieces, yoke, windings and field.
Secondary-armature consisting of coils
and iron core.
2. When the coil is in the neutral plane.
3. When the coil sides are directly under the pole pieces.
4. Always a.c.
5. By rectifying the d.c. in a commutator.
6. More coils eliminate the peaks and valleys of current.
Pulsations are reduced.
7. Series connections.
8. Less reluctance, cheaper, easier to repair, all coil
sides cut flux.
9. The stator is the stationary part containing the armature
windings. The rotor is the
rotating part containing the field
coils.
10. So that the high voltages obtained in a.c. will not
be taken off on a shipping contact.
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Chapter 14 |
