Voltage control method
Field diverter method
Field control method
Armature resistance control method
Answer is Right!
Answer is Wrong!
The correct answer is: A. Voltage control method.
Ward-Leonard control is a method of controlling the speed of a DC motor by varying the voltage applied to its armature. The voltage is controlled by a variable resistor, called a rheostat, which is placed in series with the armature. When the rheostat is adjusted, it changes the amount of current that flows through the armature, which in turn changes the speed of the motor.
The other options are incorrect because they do not describe the Ward-Leonard control method.
- Option B, Field diverter method, is a method of controlling the speed of a DC motor by varying the amount of current that flows through the field winding. The field winding is a coil of wire that surrounds the stator of the motor. When the current through the field winding is increased, the magnetic field of the motor is increased, which in turn increases the speed of the motor.
- Option C, Field control method, is a method of controlling the speed of a DC motor by varying the strength of the magnetic field produced by the field winding. The strength of the magnetic field is controlled by adjusting the current that flows through the field winding.
- Option D, Armature resistance control method, is a method of controlling the speed of a DC motor by varying the resistance of the armature circuit. The resistance of the armature circuit is controlled by adjusting the value of the rheostat that is placed in series with the armature.