Effect of a freewheeling diode in a controlled rectifier (inductive load) Adding a freewheeling diode across the load in a controlled rectifier primarily improves the shape of which waveform?

Introduction / Context:In controlled rectifiers feeding inductive loads, current continuity is crucial. A freewheeling diode provides an alternate path when the supply voltage reverses or the controlled device is turned off.

Given Data / Assumptions:

• Inductive load where current cannot change instantaneously.
• Freewheeling diode connected across the load (or DC terminals).

Concept / Approach:When the source voltage becomes unfavorable, the inductor forces current to continue; the freewheeling diode conducts that current, preventing abrupt current decay and reducing ripple.

Step-by-Step Solution:Without diode: current falls sharply at each commutation → high ripple.With diode: current circulates through the diode → smoother, more DC-like load current.Thus, the waveshape of load current is improved (less ripple, more continuity).

Verification / Alternative check:Waveform sketches show extended current flow during the freewheel interval leading to reduced torque ripple in motor loads.

Why Other Options Are Wrong:Marking this statement as False would contradict standard rectifier practice.

Common Pitfalls:Assuming the diode is unnecessary for resistive loads; its benefit is primarily with inductive loads.

Final Answer:True