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 number of depletion layers in a transistor is—








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    The number of depletion layers in a transistor is 2.

    Correct Option: D

    The number of depletion layers in a transistor is 2.

  1. In a p-n-p transistor, in the base region, the main stream of current is—








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    In a pnp transistor, in the base region, the main stream of current is diffusion of holes because holes emit from emitter and some hole diffuse in the base region.

    Correct Option: B

    In a pnp transistor, in the base region, the main stream of current is diffusion of holes because holes emit from emitter and some hole diffuse in the base region.

  1. The conductivity of the emitter region of a BJT is kept—








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    The conductivity of the Emitter region of a BJT kept much larger than that of base region because the main function of emitter is to emit the charge carriers (i.e. electrons or holes). So for achieving this conductivity of emitter region of a BJT kept much larger than that of base and collector region.

    Correct Option: C

    The conductivity of the Emitter region of a BJT kept much larger than that of base region because the main function of emitter is to emit the charge carriers (i.e. electrons or holes). So for achieving this conductivity of emitter region of a BJT kept much larger than that of base and collector region.

  1. The current through the zener diode in figure given below is—










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    The given circuit(i.e., fig)
    The voltage across, RZ = 3·5 – 3·3 = 0·2V

    I Z =
    VRZ
    		=
    0·2V
    		= 2 mA
    RZ0·1 KΩ

    Hence alternative (C) is the correct choice.


    Correct Option: C

    The given circuit(i.e., fig)
    The voltage across, RZ = 3·5 – 3·3 = 0·2V

    I Z =
    VRZ
    		=
    0·2V
    		= 2 mA
    RZ0·1 KΩ

    Hence alternative (C) is the correct choice.


  1. The device associated with voltage-controlled capacitance is a—








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    The device associated with voltage-controlled capacitance is a varactor diode.

    Correct Option: C

    The device associated with voltage-controlled capacitance is a varactor diode.