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The value of current at time of starting is ___________(a) High(b) Low(c) Very low(d) 0This question was posed to me in class test.My question is taken from Countercurrent Braking of DC Shunt Motors in division Braking of DC Motors & Induction Motors of Electric Drives

Answer»

The correct ANSWER is (a) HIGH

The explanation is: At the TIME of starting the MOTOR is at rest. The e.m.f developed in the motor is zero. Ia×Ra = Vt-Eb. Ia=Vt÷Ra. The starting current is very high about 10-15 times of FULL load current.



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