In shunt dc motor the direction of rotation of the motor will reversed.
When
A. either field terminals are reversed or armature terminals are reversed.
B. only armature terminals are reversed.
C. only field terminals are changed.
D. none of above.
Answer: A
Share your understanding of this question with the correct explanation.
The correct answer is A. The direction of rotation of a shunt DC motor will be reversed if either the field terminals or the armature terminals are reversed.
In a shunt DC motor, the direction of rotation is determined by the interaction between the magnetic field produced by the field winding and the magnetic field produced by the armature current. If the polarity of either the field terminals or the armature terminals is reversed, it will result in a reversal of the magnetic fields, causing the motor to rotate in the opposite direction.
Therefore, to reverse the direction of rotation of a shunt DC motor, you can either reverse the connections of the field terminals or reverse the connections of the armature terminals.