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. In figure, capacitor C is initially charged with voltage V0 with upper plate positive. Switch S is closed at t = 0, At t = 0+, Vc and i are given by—










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    The given circuit (i.e., fig)
    From below figure, VC = – V0

    and i =
    V
    0


    Correct Option: B

    The given circuit (i.e., fig)
    From below figure, VC = – V0

    and i =
    V
    0


  1. In figure, PIV required for the diode is—










  1. View Hint View Answer Discuss in Forum

    The given circuit (i.e., fig-1)
    The PIV (i.e., Peak Inverse Voltage) is the maximum voltage that appears across the diode when it is in nonconducting stage.
    – PIV + 300 + 100 = 0
    or PIV = 400 V
    Hence alternative (D) is the correct choice.


    Correct Option: D

    The given circuit (i.e., fig-1)
    The PIV (i.e., Peak Inverse Voltage) is the maximum voltage that appears across the diode when it is in nonconducting stage.(i.e., fig-2)
    – PIV + 300 + 100 = 0
    or PIV = 400 V
    Hence alternative (D) is the correct choice.


  1. The peak current through the resistor of circuit of figure, assuming the diodes to be ideal, is—










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    The given circuit (i.e. fig - 1)
    The equivalent circuit under peak voltage of 12V is given by (i.e. fig - 2)
    I = (12 – 4) V 1 kΩ = 8 mA


    Correct Option: D

    The given circuit (i.e. fig - 1)
    The equivalent circuit under peak voltage of 12V is given by (i.e. fig - 2)
    I = (12 – 4) V 1 kΩ = 8 mA


  1. A voltage V = 4 sin t is applied to the terminals A and B of the circuit shown in figure. The diodes are assumed to be ideal. The impedance offered by the circuit across the terminals A and B in kilo-ohms is—










  1. View Hint View Answer Discuss in Forum

    The given circuit (i.e., fig-1)
    for the first half cycle equivalent circuit is given by (i.e., fig-2)
    for the second half cycle the equivalent circuit is given by (i.e., fig-3)
    Hence alternative (C) is the correct choice.


    Correct Option: C

    The given circuit (i.e., fig-1)
    for the first half cycle equivalent circuit is given by (i.e., fig-2)
    for the second half cycle the equivalent circuit is given by (i.e., fig-3)
    Hence alternative (C) is the correct choice.


  1. In figure, capacitor C is charged to V0 = 50 V with upper plate positive. Switch S is closed at t = 0. Current through the circuit at t = 0 and final voltage across C are respectively—










  1. View Hint View Answer Discuss in Forum

    The given circuit
    at t = 0 the equivalent circuit becomes

    I =
    (200 – 50) V
    		= 15 A
    10Ω

    And, the final voltage across C means at steady state capacitors becomes open circuited as shown below:
    VC(∞) = 200V
    Hence alternative (A) is the correct choice.


    Correct Option: A

    The given circuit
    at t = 0 the equivalent circuit becomes

    I =
    (200 – 50) V
    		= 15 A
    10Ω

    And, the final voltage across C means at steady state capacitors becomes open circuited as shown below:
    VC(∞) = 200V
    Hence alternative (A) is the correct choice.