A. Field
B. Armature resistance
C. Armature voltage
D. Field diverter
Answer: C. Armature voltage
Explanation:
Ward-Leonard method of speed control is achieved by varying the applied voltage to the armature. Hence it is basically an armature voltage control method.
Ward Leonard’s method of speed control is used for controlling the speed of a DC motor. It is a basic armature control method. The speed control of the D.C. motor can be obtained by varying the applied voltage to the armature.
At the base speed, the motor armature is fed at rated voltage and its field current is adjusted to the maximum value, i.e. the field is excited at rated voltage. Reducing the armature voltage provides a constant- torque speed control where the speed can be reduced below the base value.
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