Question

Dynamic braking is very effective for:

• A. DC series motor
• B. DC shunt motor
• C. Separately excited DC motor
• D. Cumulatively compound DC motor

Hint:

Dynamic braking is most effective in DC shunt motors because their field remains constant, ensuring a smooth and predictable braking effect.

Answer 1

The Correct Option is B

Step 1: Dynamic braking is a method of slowing down a DC motor by disconnecting it from the power supply and connecting a resistor across the armature. This causes the motor to act as a generator, dissipating energy as heat. 
Step 2: In a DC shunt motor, the field winding is connected in parallel with the armature, ensuring a nearly constant magnetic field during braking. This provides smooth and effective braking. 
Step 3: DC series motors are less effective in dynamic braking since their field winding is in series with the armature, and the field weakens as the speed decreases. 
Step 4: Separately excited and cumulatively compound DC motors also exhibit braking effects, but they are not as efficient or stable as in DC shunt motors.