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ECE :: Analog Electronics

Analog Electronics - Section 1
Analog Electronics - Section 2
Analog Electronics - Section 3
Analog Electronics - Section 4
Analog Electronics - Section 5
Analog Electronics - Section 6
Analog Electronics - Section 7
Analog Electronics - Section 8
Analog Electronics - Section 9
Analog Electronics - section-1
Analog Electronics - Section 10
Analog Electronics - Section 11
Analog Electronics - Section 12
Analog Electronics - Section 13
Analog Electronics - Section 14
Analog Electronics - Section 15
Analog Electronics - Section 16
Analog Electronics - Section 17
Analog Electronics - Section 18
Analog Electronics - Section 19
Analog Electronics - Section 20
Analog Electronics - Section 21
Analog Electronics - section-22
Analog Electronics - Section-23

  1. The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The input signal-to noise ratio is

    2. A.
    2
    B.
    10
    C.
    20
    D.
    100

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  2. Assertion (A): A good op-amp should have very large band width

    Reason (R): An ideal op-amp should have infinite input resistance and zero output resistance

    3. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

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  3. In all base driver amplifiers

    4. A.
    ac collector voltage is 180° out of phase with ac base voltage
    B.
    ac emitter voltage is 180° out of phase with ac base voltage
    C.
    ac collector voltage is in phase with ac base voltage
    D.
    none of the above

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  4. The horizontal intercept of dc load line is the same as ideal

    5. A.
    cut off point
    B.
    saturation point
    C.
    operating point
    D.
    quasi saturation point

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  5. Figure represents a

    6. A.
    NPN transistor
    B.
    PNP transistor
    C.
    Zener diode
    D.
    Power diode

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  6. In deriving ac equivalent circuit for an amplifier circuit we short circuit

    7. A.
    all resistors
    B.
    all transistors
    C.
    all inductors
    D.
    all capacitors

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  7. Which of the following statements is false?

    8. A.
    Push pull signals are equal and opposite in phase
    B.
    Class AB operation cannot be used for a push pull audio power output phase
    C.
    A push pull output transformer has a centre-tapped primary
    D.
    All of the above

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  8. Which of the following amplifier circuit using junction transistor has the best gain?

    9. A.
    Common base
    B.
    Common emitter
    C.
    Common collector
    D.
    All have the same gain

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  9. In an op-amp differentiator

    10. A.
    the amplitude of output is proportional to rate of change of input
    B.
    the amplitude of output is proportional to input
    C.
    output occurs when input is finite and constant
    D.
    polarity of input and output is the same

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  10. In switching devices, gold doping is used to

    11. A.
    improve bonding
    B.
    reduce storage time
    C.
    increase the mobility of the carrier
    D.
    protect the terminals against cooperation

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