semiconductor questions with solutions

Showing 1–10 of 113 questions

• MCQmediumsemiconductorP-N jucntion and diode in reverse and forward bias

  When a p-n junction is forward biased, which quantity is NOT approximately reduced?

  Options

  • Option A

    Potential barrier

  • Option B

    Depletion width

  • Option C

    Junction resistance

  • Option D

    Majority-carrier concentration far inside neutral semiconductor

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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 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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• MCQmediumsemiconductorlogic gate

  In the diode logic circuit shown in the original question figure, identify the logic gate represented at output Y.

  

  Options

  • Option A

    OR

  • Option B

    AND

  • Option C

    NOT

  • Option D

    NAND

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  A Zener diode of Zener voltage 5 V is used to regulate an unregulated dc input of 25 V. A 400 Ω resistor is connected in series, and the Zener current is four times the load current. The load current I(L) and load resistance R(L) are:

  Options

  • Option A

    I(L)=10 A; R(L)=0.5 Ω

  • Option B

    I(L)=10 mA; R(L)=500 Ω

  • Option C

    I(L)=20 mA; R(L)=250 Ω

  • Option D

    I(L)=0.02 mA; R(L)=250 Ω

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• Integereasysemiconductorapplication of diode and zener breakdown

  A Zener diode has Zener voltage 10 V and maximum permissible power dissipation 0.5 W. It is connected to a 25 V supply through a series resistor. If the minimum safe value of the resistor is N Ω, find N.

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• MCQmediumsemiconductorP-N jucntion and diode in reverse and forward bias

  A diode obeys I=$I_s[e^(V/(ηV_T))-1].$ For V≫η$V_T,$ increasing V by η$V_T$ ln10 changes forward current approximately by a factor:

  Options

  • Option A

    e

  • Option B

    2

  • Option C

    10

  • Option D

    100

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• MCQeasysemiconductorapplication of diode and zener breakdown

  In the Zener-diode circuit shown in the original figure, the supply is 12 V, the series resistor is 100 Ω, the load branch contains 400 Ω and the Zener breakdown voltage is 4 V. The ammeter reading is:

  

  Options

  • Option A

    24 mA

  • Option B

    80 mA

  • Option C

    10 mA

  • Option D

    60 mA

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• MCQmediumsemiconductorP-N jucntion and diode in reverse and forward bias

  Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode D₁ in the circuit is ______ mA. (Assume all diodes in the given circuit are identical)

  

  Options

  • Option A

    20.15

  • Option B

    11.7

  • Option C

    17.6

  • Option D

    18.8

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• A/RmediumsemiconductorP-N jucntion and diode in reverse and forward bias

  Choose the correct option for the following Assertion (A) and Reason (R).

  Assertion

  A diode under reverse bias carries a very small current that remains nearly independent of reverse voltage until breakdown, beyond which the current increases sharply.

  Reason

  Below the breakdown voltage, the reverse current is mainly due to majority charge carriers, and their flow increases drastically at breakdown.

  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 true but R is false.

  • Option D

    A is false but R is true.

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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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