Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 240
e, the Gratz methodof connection is adopted. The maximum efficiency is obtained at about 140 volts, andthe efficiency lies between 65 and 75 per cent., and is practically independent of the fre-quency between the limits of 25 ~ and 200 —. Above a pressure of 140 volts, the effi-ciency falls off… … Fig. 2.082.—Oscillograph record from Xodon valve showing original supply voltage and thecorresponding pulsating current at the terminals of such a valve. RECTIFIERS 1,499 Ques. How may both halves of the alternating wavesbe utilized? Ans. By coupling a series of cells in opposed pairs as in…
Electrical engineering
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