Consider the following statements regarding freewheeling diode:1.It provides path for inductive load current.2.It reduces voltage spikes.3.It improves efficiency.4.It is used only in AC circuits.Which of the statements are correct?

Correct Answer: A - 1, 2 and 3 only

Quick Concept Explanation

A freewheeling diode gives inductive current a path when the main source/switch is removed. It clamps otherwise large inductive overvoltage, keeps current continuous and can improve efficiency and waveform quality in DC converter/rectifier circuits. Key relation: Inductor relation v=L di/dt explains the voltage spike if current path is interrupted.

Exam focus: Always provide a current path for stored inductive energy. Common trap: Freewheeling diodes are not limited to AC circuits.

Statement-wise Verification

• Statement 1 - Correct.
  It provides path for inductive load current.
  Always provide a current path for stored inductive energy.
• Statement 2 - Correct.
  It reduces voltage spikes.
  Inductor relation v=L di/dt explains the voltage spike if current path is interrupted.
• Statement 3 - Correct.
  It improves efficiency.
  It clamps otherwise large inductive overvoltage, keeps current continuous and can improve efficiency and waveform quality in DC converter/rectifier circuits.
• Statement 4 - Incorrect.
  It is used only in AC circuits.
  The correct principle is: It clamps otherwise large inductive overvoltage, keeps current continuous and can improve efficiency and waveform quality in DC converter/rectifier circuits.

Core Concept

A freewheeling diode gives inductive current a path when the main source/switch is removed. It clamps otherwise large inductive overvoltage, keeps current continuous and can improve efficiency and waveform quality in DC converter/rectifier circuits.

Formula / Key Relationship

Inductor relation v=L di/dt explains the voltage spike if current path is interrupted.

Why the Other Options Are Wrong

Option B is incorrect because it includes incorrect statement(s) 4 and omits correct statement(s) 2, 3. Option C is incorrect because it omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 4.

Exam Shortcut / Approach

Always provide a current path for stored inductive energy.

Common Mistake

Freewheeling diodes are not limited to AC circuits.

Quick Revision

Inductive Current Freewheeling is linked with Freewheeling Diode, Choppers and Rectifiers and Power Electronics. Always provide a current path for stored inductive energy.