Physical electronics devices and ics miscellaneous

Physical electronics devices and ics miscellaneous

Easy Questions

Physical Electronics Devices and ICs

Physical electronics devices and ics miscellaneous
  1. The common-emitter short circuit current gain of a transistor—








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    From figure it is clear that alternative (C) is the correct answer.

    Correct Option: C


    From figure it is clear that alternative (C) is the correct answer.

  1. The voltages at V1 and V2 of the arrangement shown in the figure will be respectively—










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    Since for the diode D2 cathode is at higher potential than anode. Hence diode D2 will not conduct, i.e. no current in upper RΩ resistance so V1 = 6 V.
    But anode of diode D1 is at higher potential than cathode so the diode D1 will conduct.

    V2 = 6 – VT = 6 – .6 = 5.4 V (VT = cut-in voltage of diode)
    Hence alternative (A) is the correct answer.

    Correct Option: A

    Since for the diode D2 cathode is at higher potential than anode. Hence diode D2 will not conduct, i.e. no current in upper RΩ resistance so V1 = 6 V.
    But anode of diode D1 is at higher potential than cathode so the diode D1 will conduct.

    V2 = 6 – VT = 6 – .6 = 5.4 V (VT = cut-in voltage of diode)
    Hence alternative (A) is the correct answer.

  1. Silicon diode is less suited for low voltage rectifier operation, because—








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    Silicon diode is less suited for low voltage rectifier operation, because its breakdown voltage is high, due to which it can withstand higher temperature.

    Correct Option: D

    Silicon diode is less suited for low voltage rectifier operation, because its breakdown voltage is high, due to which it can withstand higher temperature.

  1. In an unbiased p-n junction, the junction current at equilibrium is—








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    NA

    Correct Option: C

    NA

  1. Avalanche photodiodes are preferred over PIN diodes in optical communication systems because of—








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    Avalanche photodiodes are preferred over PIN diodes in optical communication systems because of large power handling capacity.

    Correct Option: D

    Avalanche photodiodes are preferred over PIN diodes in optical communication systems because of large power handling capacity.