Question

The direction of rotation of a DC series motor can be reversed:
(I) By interchanging supply terminals
(II) By interchanging field terminals

• A. I only
• B. II only
• C. Either (I) or (II)
• D. Neither (I) nor (II)

Hint:

In DC motors, the direction of rotation can be reversed either by interchanging the supply terminals or the field terminals.

Answer 1

The Correct Option is C

For a DC series motor, the direction of rotation can be reversed in two ways:
1. By interchanging the supply terminals: Reversing the polarity of the supply voltage will reverse the direction of current in the armature and the field windings, thus reversing the motor’s rotation.
2. By interchanging the field terminals: Reversing the direction of the field current will also reverse the direction of rotation, as the interaction between the field and armature currents determines the motor's rotation.
Thus, either interchanging the supply terminals or the field terminals will reverse the direction of rotation of the motor.