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 210
s. Ques. Why are two relays used ? Ans. For the reason that a primary relay, of sufficientaccuracy and freedom from errors due to temperature and REGULATING DEVICES 1,729 frequency variations, could not be made sufficiently powerfulto carry the relatively large current required for operating… … Fig. 2,428.—Diagram of connections of General Electric direct current (form S) voltageregulator, for 12.3, 2.50, and 550 volts. The range of voltage is given in the follow-ing table: Regulator Range of voltage 16 17 IS 19 20 125 250 550 105 110 115 120210 220 230 240550 125250 and tendency of the…
Electrical engineering
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