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Electrical Engineering D.C. Motors Difficulty: Medium

For constant torque drive which speed control method is preferred?

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Which part of a motor needs maximum attention for maintenance? In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of Insertion of reactance in the rotor circuit Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals? If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is