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2 RICHARDSON'S BLUEBOOK OF PROJECTION
21. By what two methods is the current used in projection generated ?
How a Generator Armature Acts, page 10
-22. Upon what law does the dynamo depend for its action r
23. What do the dotted lines in Fig. 1 represent?^'
24. Why is the circuit shown in Figure 1 a closed circuit?
25. Why does the rotation of coil A-B generate electric current r
26. Why does the current or E.M.F. vary in strength as coil A-B
is rotated ? 27 Why does the action of coil A-B generate alternating current?
28. Why should arrows be reversed under the new conception
of current action?
29. Does all electrical action cease two times during each revo
lution of coil A-B?
30. How often does current change mrnulti-polar. dynamos^? j
31. Describe the principles involved in transforming alternat
ing current into direct current by commutation. ^<^ '
32. In studying commutation what is it important to remember?
The Generator, page 14\<^r>^
33^ What kind or type of generator is illustrated in Figure 3 ?
34. Name its different parts. . , «***" d fi£?
35. What does magnetic force represent?
36. What will occur if an insulated wire be wound around an
iron bar and current be sent through the wire?
37. Upon what will the resultant magnetizing effect depend?"
38. How is the density of magnetic pressure of a magnetic field
described? f
39. Upon what does capacity of such a machine as shown in
Figure 3 depend? P*f •
40. What is a permanent magnet ?.-..■
41. What is magnetism retained in an inoperative magnet called? —42. Describe start of current generation in a generator.
43. What is meant by "point of saturation" in a magnet? 44 What happens when at the starting of a generator the point of required voltage is reached?
45. Do multi-polar generators have, in effect, only two poles? J ,
46. What is the object of multi-poles? -&yi-&
I