F. H. Richardson's bluebook of projection (1935)

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ELECTRICAL ACTION 3 Direct or Alternating Current, page 17 47. What is the accepted abbreviation for alternating current : 48. What is the direction of flow of a.c. 1 ~*r»vu *?lU± 49. How often does the direction of flow change in ordinary commercial currents ? 50. Direct current being superior for lighting purposes, why i not more generally generated? 51. Can a.c. or d.c. voltage be raised or lowered after gen eration with equal ease and at equally low expense 52. How may electrical power be calculated in terms of hi power? - ? 53. Voltage and horse power known, how calculate watts and 54. May a wire carry its amperage capacity at any voltage it may be insulated to retain? 55. What effect has increased voltage upon current in power delivery? i ' , f*»+*'' \ 56. Why may power be transported more cheaply at high than at low voltage? 57. By means of what instrument may voltage of a.c. be raised or lowered after generation ? z Alternating Current Action, page 18 58. Describe the flow of a.c. 59. What is a "cycle"? Of what does it consist? 60. What is meant by "current frequency"? 61. At how low frequency may light without visible flicker be produced? ... 62. For what may low cycle a.c. be used to advantage? 63. What cycle current is most frequently used where both light and power are supplied ? 64. Is there invisible flicker in a.c. regardless of how high the frequency may be? ->< 65. What do the vertical and horizontal lines in Fig. 4 represent? -J56. Explain meaning of triangles above and below line O, Fig. 4?^ What does each triangle side represent? 67. What does line O represent with regard to the triangles? Two and Three-Phase Current, page 20 68. What is 2-phase current and what is its advantage?