Electric Machines (Sigma)

Electric Machines (Sigma)

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Ans. Consider the speed torque characteristics of a three phase induction motor with voltage as a parameter, ... By triac control we are essentially changing the RMS value of the applied voltage, thus the operating point can be ... For SCR to conduct it must be forward biased, and, in addition to that, a trigger pulse of current must flow between the gate and the cathode. ... For reverse voltages the diode as well as the SCR both act as open circuits, i.e. block the reverse voltage ( up toanbsp;...

Title:Electric Machines (Sigma)
Author: D. P. Kothari
Publisher:Tata McGraw-Hill Education - 2006-06-01

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