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Quiz: EDC-PN Junction Theory

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Number of Questions: 20

Question: 1 -

A zener diode has a zener resistance of 5 ohm . If the current through the zener diode changes from 10mA to 20mA , the change of voltage across the zener diode will be

Options:

  1. 0.1V

  2. 0.075V

  3. 0.05V

  4. 0.5 V

    5. Answer:

    0.05V
    Solution not available.

Question: 2 -

Reversed - biased diodes are frequently employed as electrically controllable variable capacitors . The transition capacitance of an abrupt junction diode is 20 pF at 5V . Then the decreased capacitance for a 1.0 V increase in bias is,

Options:

  1. 18.25 pF

  2. 7.08 pF

  3. 16.67 pF

  4. 70.8 pF

    5. Answer:

    18.25 pF
    Solution not available.

Question: 3 -

A p-n junction diode's dynamic conductance is directly proportional to

Options:

  1. The thermal voltage

  2. The applied voltage

  3. Its current

  4. The temperature

    5. Answer:

    Its current
    Solution not available.

Question: 4 -

The free electron density in a conductor is (1/1.6) * 1022 cm-3 . The electron mobility is 10 cm2/V-sec . What is the value of its resistivity ?

Options:

  1. 104 mho cm-1

  2. 10-4 Ω cm

  3. 1.6 * 10-2 W m

  4. 10-4 W m

    5. Answer:

    10-4 Ω cm
    Solution not available.

Question: 5 -

An ideal germanium p-n junction diode has a reverse saturation current of 30µA . At a temperature of 125° C , the dynamic resistance for a 0.2 V bias in the forward direction is ,

Options:

  1. 2.26 Ω

  2. 44.9 Ω

  3. 50.4 Ω

  4. 3.36 Ω

    5. Answer:

    3.36 Ω
    Solution not available.