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270 RICHARDSON'S BLUEBOOK OF PROJECTION
50. What purpose does the lead washer serve?
51. How is pressure between copper and lead secured and retained? , •
52. Is the exact amount of pressure important?
53. Of what does the commercial form of copper-oxide rectifier consist?
54. Do copper-oxide rectifiers require replacement of parts or demand attention? ' 7***
55. Is the proper operation of the ventilating fan important? What protection is there against the failure of the fan? Uv*u
56. How does the efficiency of these rectifiers compare with \ that of other current rectifiers?
57. What other substances beside copper-oxide are available for rectifying purposes? sm*^
58. Are rectifiers available for all phases of a.c. ?
59. Where should copper-oxide rectifiers be located ?
60. Is it practical to overload them ? .-^kv*)"".
Motor Generator Sets, page 295
61. What is a ' 'brush"? Has it many varieties and what pur t pose does it serve? >*^t . .."yy^^yfJ^ t ^A
62. What is meant by "brush loss"? How does it occur?
63. What is meant by "brush pressure" ?
64. What should be the limits of brush pressure ? sjL+**Jr*&& $fl
65. What difficulty does too much or too little bruslupressure
cause?
66. How may brush pressure be measured?
67. What is the brush rocker or yoke? How should it be^et?
68. What is a compoundwound generator or motor?
69. What is the effect of compound winding of motor held magnets?
70. What is a commutator and what is its function ?
71. What condition is indicated by a commutator "flat"?
72. What is a commutator "lug" and what is its purpose:
73. What is meant by a parallel connection of dynamos or alternators ?
74. What is polyphase current ? How is it produced ?
75. What is the amperage and voltage of dynamos connected in series? 'WjmJBM
76. What is the effect of a series wound dynamo?