application of diode and zener breakdown questions with solutions

Showing 1–10 of 44 questions

• A/Reasysemiconductorapplication of diode and zener breakdown

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

  Assertion

  Photodiodes are preferably operated in reverse bias condition for light intensity measurement.

  Reason

  The current in the forward bias is more than the current in the reverse bias for a p – n junction diode.

  Options

  • Option A

    A is false but R is true

  • Option B

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

  • Option C

    A is true but R is false

  • Option D

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

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  JEE Mains24 January 2023Shift 1Morning Shift

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  A 12 V source feeds a network with a 4 Ω resistor from the top node to A. From A to the bottom node there are two 4 Ω branches, one directly and one through an ideal forward-biased diode to B and then 4 Ω to the bottom. Statements: (A) ammeter current is 2 A; (B) net resistance is 8 Ω; (C) voltage across BC is 4 V; (D) diode current is 1 A. Choose the correct option.

  

  Options

  • Option A

    Only ABC are correct

  • Option B

    Only ACD are correct

  • Option C

    Only ABD are correct

  • Option D

    Only AD are correct

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  JEE Mains 2025 23 Jan Morning Shift

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• A/Reasysemiconductorapplication of diode and 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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  JEE Mains25 January 2023Morning Shift

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  For the previous circuit, use silicon diodes with 0.7 V forward drop. $V_o$ is approximately:

  Options

  • Option A

    5.0 V

  • Option B

    4.3 V

  • Option C

    3.0 V

  • Option D

    2.3 V

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• MCQeasysemiconductorapplication of diode and zener breakdown

  Diode A breaks down near 4 V and diode B near 100 V. Which mechanism is more likely dominant?

  Options

  • Option A

    A avalanche, B Zener

  • Option B

    A Zener, B avalanche

  • Option C

    Both Zener

  • Option D

    Both avalanche

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  In the previous regulator, a 1 kΩ load is placed parallel to the 5 V Zener. Zener current is:

  Options

  • Option A

    5 mA

  • Option B

    10 mA

  • Option C

    15 mA

  • Option D

    20 mA

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  An ideal Zener regulator remains in breakdown while input voltage increases and load resistance is fixed. Which changes most directly?

  Options

  • Option A

    Output voltage

  • Option B

    Zener current

  • Option C

    Zener voltage becomes zero

  • Option D

    Load voltage follows input

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  A 20 V supply feeds a node through 500 Ω. An ideal 10 V Zener and 1 kΩ load are in parallel to ground. Which is correct?

  Options

  • Option A

    Zener OFF, $V_o=20$ V

  • Option B

    Zener OFF, $V_o=10$ V

  • Option C

    Zener ON, $V_o=10$ V, $I_Z=10$ mA

  • Option D

    Zener ON, $V_o=10$ V, $I_Z=20$ mA

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• Numericeasysemiconductorapplication of diode and zener breakdown

  A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W, is operated at 15 V. The approximate value of protective resistance in this circuit is ________ Ω.

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• Numericmediumsemiconductorapplication of diode and zener breakdown

  A potential divider circuit is connected with a dc source of 20 V, a light emitting diode of glow in voltage 1.8 V and a zener diode of breakdown voltage of 3.2 V. The length (PR) of the resistive wire is 20 cm. The minimum length of PQ to just glow the LED is ______ cm.

  

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