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Analog Electronics MCQ Questions and Answers

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Analog Electronics MCQ Questions and Answers: here learn anolog electronics multiple choice questions and answers related to electrical engineering. here you can learn mcqs questions for electrical engineering.

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11) An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is

    1/11KΩ
    1/5KΩ
    5KΩ
    11KΩ

Answer : A Discuss

12) The most commonly used amplifier in sample & hold circuits is

    A unity gain non-inverting amplifier
    A unity gain inverting amplifier
    An inverting amplifier with a gain of 10
    An inverting amplifiers with a gain of 100

Answer : B Discuss

13) An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is

    0.25
    0.5
    0.75
    1

Answer : B Discuss

14) In a common emitter, unbypassed resister provides

    voltage shunt feedback
    current series feedback
    negative voltage feedback
    positive current feedback

Answer : C Discuss

15) The current gain of a BJT is

    gm r0
    gm / r0
    gm rπ
    gm /rπ

Answer : C Discuss

16) The current gain of a bipolar transistor drops at high frequencies because of

    Transistor capacitances
    High current effects in the base
    Parasitic inductive elements
    The early effect

Answer : A Discuss

17) Generally, the gain of a transistor amplifier falls at high frequencies due to the

    Internal Capacitance of the device
    Coupling capacitor at the input
    Skin effect
    Coupling capacitor at the output

Answer : A Discuss

18) An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed

    795mV
    395mV
    795 mV
    39.5mV

Answer : C Discuss

19) Voltage Series (feedback also called series-shunt feedback) results in

    Increase in both input & output impedances
    Decreases in both input & output impedances
    Increase in input impedance & decreases in output impedance
    Decrease in input impedance & increase in output impedance

Answer : C Discuss

20) MOSFET can be used as a

    Current controlled capacitor
    Voltage controlled capacitor
    Current controlled inductor
    Voltage controlled inductors

Answer : B Discuss

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