Methods of Excitation of DC Generator: The performance characteristics of a dc machine are greatly influenced by the way in which the field winding is excited with direct current. There…
Commutation in DC Machine or Generator or Motor: One coil each under an adjoining pole-pair is connected between adjacent commutator segments in a lap-wound dc armature, while in a wave-wound…
Circuit Model of DC Machine: The parallel paths of DC machine armature are symmetrical and each has an induced emf Ea and a resistance Rp. The armature can be represented…
Construction and Working Principle of DC Motor: Construction and Working Principle of DC Motor is a heteropolar structure with stationary poles and the rotating armature (Fig. 5.8). DC Machine Basic…
DC Motor Losses and Efficiency: The Losses and Efficiency of a transformer have been studied in earlier lesson. As in the case of transformers, it is more accurate to determine…
Armature Winding in DC Machine: With reference to the single-coil elementary Armature Winding in DC Machine of Figs 5.13 and 5.14(a) which shows the B-wave of the machine relative to…
Transmission Line Constants Interview Questions and Answers: 1. Distinguish between ac and dc resistances of a conductor. Why the two differ ? Ans. The resistance offered to dc, by a…
PN Junction Diode Interview Questions and Answers: 1. What is a P-N junction? Ans. The contact surface between the layers of P-type and N-type semiconductor pieces placed together so as to…