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. Reverse recovery current in a diode depends upon—








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    In a diode, reverse recovery current and storage charge depends on the forward current of the device.

    Correct Option: A

    In a diode, reverse recovery current and storage charge depends on the forward current of the device.

  1. Under high electric field, in a semiconductor with increasing electric field—








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    Under high electric field, in a semiconductor with increasing electric field the velocity of charge carriers saturates.

    Correct Option: C

    Under high electric field, in a semiconductor with increasing electric field the velocity of charge carriers saturates.

  1. Ratio of maximum resistivity to intrinsic resistivity max / i is expressed as—








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    It will first increase exponentially upto a temperature T then remain constant at 1015 cm– 3 over the remaining range

    Correct Option: C

    It will first increase exponentially upto a temperature T then remain constant at 1015 cm– 3 over the remaining range

Direction: In the voltage regulator circuit shown below. The zener diode current is to be limited to the range 5 ≤ i Z ≤ 100 mA.

  1. The power rating required for the load resistance—








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    Power rating,
    Pz (max) = IL (max) × Vz
    = 120 × 10– 3 × 4.8 = 576 mW

    Correct Option: A

    Power rating,
    Pz (max) = IL (max) × Vz
    = 120 × 10– 3 × 4.8 = 576 mW

  1. The range of possible load resistance—








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    The range of possible load resistance

    RL (min) =
    VZ
    		 =
    V0
    IL (max)IL (max)

    or RL (min) =
    4·8 V
    		= 40 Ω
    120 mA

    and RL (max) =
    VZ
    		 =
    V0
    IL (max)IL (min)

    or RL (max) =
    4·8 V
    		= 192 Ω
    25mA

    Therefore, 40 Ω ≤ RL ≤ 192 Ω Hence alternative (C) is the correct choice.

    Correct Option: C

    The range of possible load resistance

    RL (min) =
    VZ
    		 =
    V0
    IL (max)IL (max)

    or RL (min) =
    4·8 V
    		= 40 Ω
    120 mA

    and RL (max) =
    VZ
    		 =
    V0
    IL (max)IL (min)

    or RL (max) =
    4·8 V
    		= 192 Ω
    25mA

    Therefore, 40 Ω ≤ RL ≤ 192 Ω Hence alternative (C) is the correct choice.