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¶ U.S. GOVERNMENT PRINTING OFFICE; 1945 - 618779
How Well Do You Know
1. What two factors control the direction of an induced emf?
2. What three factors control the strength of an induced emf?
3. How many circuits are necessary for mutual induction?
4. How many circuits are necessary to produce self-induction?
5. Will steady d.c. produce a continuous self-induction? Why?
6. State Lenz's law in simple language.
7. How may the voltage of self-induction be dangerous around a motor?
8. In what one way does pulsating d.c. differ from regular d.c.?
9. In what two ways does a.c. differ from regular d.c.?
Return to Chapter 13
ANSWERS TO QUIZZES
1. Flux direction and the direction of cutting the flux.
2. Strength of the field, speed of the conductors, and number of conductors cutting.
3. At least two.
5. No. The flux field must move to produce self induction.
6. For every force, there is an opposite force set up which tends to cancel the first force.
7. Open the field coil circuit may produce thousands of volts of self induction.
8. Pulsating d.c. varies in strength, regular d.c. does not.
9. A.c. varies in strength and direction, regular d.c. does not vary in either.