Semiconductor Electronics : Materials, Devices and Simple Circuits

Semiconductor Electronics : Materials, Devices and Simple Circuits

Easy Questions

Modern Physics

Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics : Materials, Devices and Simple Circuits
  1. A d.c. battery of V volt is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be​​








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    In forward biasing, the diode conducts. For ideal junction diode, the forward resistance is zero; therefore, entire applied voltage occurs across external resistance R
    i.e., there occurs no potential drop, so potential across R is V in forward biased.

    Correct Option: B

    In forward biasing, the diode conducts. For ideal junction diode, the forward resistance is zero; therefore, entire applied voltage occurs across external resistance R
    i.e., there occurs no potential drop, so potential across R is V in forward biased.

  1. Reverse bias applied to a junction diode








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    In reverse biasing, the conduction across the p-n junction does not take place due to majority carriers but takes place due to minority carriers if the voltage of external battery is large. The size of the depletion region increases thereby increasing the potential barrier.

    Correct Option: C

    In reverse biasing, the conduction across the p-n junction does not take place due to majority carriers but takes place due to minority carriers if the voltage of external battery is large. The size of the depletion region increases thereby increasing the potential barrier.

  1. The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is 10V. The d.c. component of the output voltage is​​








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    V =
    V0
    		=
    10
    		V
    ππ

    Correct Option: C

    V =
    V0
    		=
    10
    		V
    ππ

  1. Zener diode is used for​​








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    At a certain reverse bias voltage, zener diode allows current  to flow through it and hence maintains the voltage supplied to any load Hence, it is used for stabilisation.

    Correct Option: C

    At a certain reverse bias voltage, zener diode allows current  to flow through it and hence maintains the voltage supplied to any load Hence, it is used for stabilisation.

  1. In semiconductors, at room temperature​​








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    In semiconductors, the conduction band is empty and the valence band is completely filled at 0 K. No electron from valence band can cross over to conduction band at 0 K. But at room temperature some electrons in the valence band jump over to the conduction band due to the small forbidden gap,
    i.e. 1 eV.

    Correct Option: C

    In semiconductors, the conduction band is empty and the valence band is completely filled at 0 K. No electron from valence band can cross over to conduction band at 0 K. But at room temperature some electrons in the valence band jump over to the conduction band due to the small forbidden gap,
    i.e. 1 eV.