Diode Applications & Zener Breakdown questions with solutions

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• MCQmediumsemiconductorDiode Applications & Zener Breakdown

  A 6 V Zener diode is used in the shown circuit with an input that varies between +10 V and -10 V. Which output-voltage waveform is obtained?

  

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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• MCQeasysemiconductorDiode Applications & Zener Breakdown

  Peak voltage of the output of a half-wave rectifier (ideal diode) is Vₘ. What is its average DC output?

  Options

  • Option A

    Vₘ/√2

  • Option B

    Vₘ/π

  • Option C

    Vₘ

  • Option D

    2Vₘ/π

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• MCQmediumsemiconductorDiode Applications & Zener Breakdown

  For the previous regulator, minimum load resistance that maintains regulation is approximately:

  Options

  • Option A

    250 Ω

  • Option B

    333 Ω

  • Option C

    500 Ω

  • Option D

    1 kΩ

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• MCQmediumsemiconductorDiode Applications & Zener Breakdown

  Choose the correct statement about a Zener diode.

  Options

  • Option A

    It works as a voltage regulator in reverse bias and behaves like a simple p-n junction diode in forward bias.

  • Option B

    It works as a voltage regulator in both forward and reverse bias.

  • Option C

    It works as a voltage regulator only in forward bias.

  • Option D

    It works as a voltage regulator in forward bias and behaves like a simple p-n junction diode in reverse bias.

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• MCQeasysemiconductorDiode Applications & Zener Breakdown

  A p–n photodiode semiconductor has band gap 2.0 eV. What is the minimum light frequency it can absorb?

  Options

  • Option A

    10 × 10¹⁴ Hz

  • Option B

    5 × 10¹⁴ Hz

  • Option C

    1 × 10¹⁴ Hz

  • Option D

    20 × 10¹⁴ Hz

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• MCQmediumsemiconductorDiode Applications & Zener Breakdown

  A Zener regulator is regulating. Load resistance decreases while input remains fixed. Before regulation is lost:

  Options

  • Option A

    Load current ↓, Zener current ↑

  • Option B

    Load current ↑, Zener current ↓

  • Option C

    Both ↓

  • Option D

    Output rises indefinitely

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• MCQmediumsemiconductorDiode Applications & Zener Breakdown

  In the shown network, ideal diodes D₁, D₂ and D₃ connect A and B through resistors. For the three applied potential pairs (i) A = -10 V, B = -5 V; (ii) A = -5 V, B = -10 V; (iii) A = -4 V, B = -12 V, find the increasing order of equivalent resistance between A and B.

  

  Options

  • Option A

    (i) < (ii) < (iii)

  • Option B

    (iii) < (ii) < (i)

  • Option C

    (ii) = (iii) < (i)

  • Option D

    (i) = (iii) < (ii)

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• MCQeasysemiconductorDiode Applications & Zener Breakdown

  Choose the correct statements: (I) A Zener diode is connected in reverse bias when used as a voltage regulator. (II) The potential barrier of a p–n junction lies between 0.1 V and 0.3 V.

  Options

  • Option A

    Both are correct

  • Option B

    Both are incorrect

  • Option C

    Only statement I is correct

  • Option D

    Only statement II is correct

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  NEET 2021NEET Previous Year

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• MCQmediumsemiconductorDiode Applications & Zener Breakdown

  Zener breakdown occurs in a p-n junction having p and n both:

  Options

  • Option A

    lightly doped and have wide depletion layer.

  • Option B

    heavily doped and have narrow depletion layer.

  • Option C

    lightly doped and have narrow depletion layer.

  • Option D

    heavily doped and have wide depletion layer.

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• A/ReasysemiconductorDiode Applications & Zener Breakdown

  Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

  Assertion

  Photodiodes are used in forward bias usually for measuring the light intensity.

  Reason

  For a p-n junction diode, at a given applied voltage magnitude within the normal operating range, current in forward bias is much greater than current in reverse bias.

  Options

  • Option A

    Both A and R are true and R is the correct explanation of A

  • Option B

    Both A and R are true but R is NOT the correct explanation of A

  • Option C

    A is false but R is true

  • Option D

    A is true but R is false

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