Statement-wise Verification

• Statement 1 - Correct.
  A diode conducts when forward-biased and blocks current in reverse bias condition ideally.
  It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current
• Statement 2 - Correct.
  The cut-in voltage for silicon diode is approximately 0.7 V.
  For a silicon diode, the familiar constant-drop approximation is about 0.7 V.
• Statement 3 - Correct.
  In reverse biased, small leakage current flows due to minority carriers.
  Practical reverse current includes a small minority-carrier leakage until breakdown.
• Statement 4 - Incorrect.
  Diode behaves as linear element under all operating conditions.
  The correct principle is: A pn-junction diode is nonlinear.

Core Concept

A pn-junction diode is nonlinear. It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V.

Formula / Key Relationship

Shockley form: I≈I_S(e^(V_D/nV_T)−1).

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 3. 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.

Exam Shortcut / Approach

Use 0.7 V only as a practical silicon approximation.

Common Mistake

A diode is not a linear element over its full operating range.

Quick Revision

Forward and Reverse Bias of Diode is linked with Diode Characteristics, Semiconductor Diodes and Analog Electronics. Use 0.7 V only as a practical silicon approximation.

Statement-wise Verification

• Statement 1 - Correct.
  A diode conducts when forward-biased and blocks current in reverse bias condition ideally.
  It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current
• Statement 2 - Correct.
  The cut-in voltage for silicon diode is approximately 0.7 V.
  For a silicon diode, the familiar constant-drop approximation is about 0.7 V.
• Statement 3 - Correct.
  In reverse biased, small leakage current flows due to minority carriers.
  Practical reverse current includes a small minority-carrier leakage until breakdown.
• Statement 4 - Incorrect.
  Diode behaves as linear element under all operating conditions.
  The correct principle is: A pn-junction diode is nonlinear.

Core Concept

A pn-junction diode is nonlinear. It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V.

Formula / Key Relationship

Shockley form: I≈I_S(e^(V_D/nV_T)−1).

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 3. 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.

Exam Shortcut / Approach

Use 0.7 V only as a practical silicon approximation.

Common Mistake

A diode is not a linear element over its full operating range.

Quick Revision

Forward and Reverse Bias of Diode is linked with Diode Characteristics, Semiconductor Diodes and Analog Electronics. Use 0.7 V only as a practical silicon approximation.

Statement-wise Verification

• Statement 1 - Correct.
  A diode conducts when forward-biased and blocks current in reverse bias condition ideally.
  It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current
• Statement 2 - Correct.
  The cut-in voltage for silicon diode is approximately 0.7 V.
  For a silicon diode, the familiar constant-drop approximation is about 0.7 V.
• Statement 3 - Correct.
  In reverse biased, small leakage current flows due to minority carriers.
  Practical reverse current includes a small minority-carrier leakage until breakdown.
• Statement 4 - Incorrect.
  Diode behaves as linear element under all operating conditions.
  The correct principle is: A pn-junction diode is nonlinear.

Core Concept

A pn-junction diode is nonlinear. It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V.

Formula / Key Relationship

Shockley form: I≈I_S(e^(V_D/nV_T)−1).

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 3. 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.

Exam Shortcut / Approach

Use 0.7 V only as a practical silicon approximation.

Common Mistake

A diode is not a linear element over its full operating range.

Quick Revision

Forward and Reverse Bias of Diode is linked with Diode Characteristics, Semiconductor Diodes and Analog Electronics. Use 0.7 V only as a practical silicon approximation.