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ECE Analog Circuit

2 papers · 104401

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2023 1044012023 V4 104401

2023104401

End Semester Examination - 2023 Semester-IV

03 Hours70 marks

Instructions

  • The marks are indicated in the right-hand margin.
  • There are NINE questions in this paper.
  • Attempt FIVE questions in all.
  • Question No. 1 is compulsory.

Q.1 Write the answer of the following (Any seven question only):

Ask AI

  1. Q1.1

    Which of these are incorrect about Darlington amplifier?

    a)

    It has a high input resistance

    b)

    The output resistance is low

    c)

    It has a unity voltage gain

    d)

    It is a current buffer

    Ask AI

  2. Q1.2

    What is a cascade amplifier?

    a)

    A cascade of two CE amplifiers

    b)

    A cascade of two CB amplifiers

    c)

    A cascade of CE and CB amplifiers

    d)

    A cascade of CB and CC amplifiers

    Ask AI

  3. Q1.3

    What is the output of a class B amplifier for sinusoidal input?

    a)

    Sinusoidal amplifier

    b)

    Half-sinusoidal

    c)

    Sinusoidal with higher frequency

    d)

    Square wave

    Ask AI

  4. Q1.4

    In a class B amplifier, it is found that DC power is 25W, find the ac power.

    a)

    10 W

    b)

    62.5 W

    c)

    25 W

    d)

    50 W

    Ask AI

  5. Q1.5

    In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called

    a)

    Positive feedback

    b)

    Negative feedback

    c)

    Cannot be predicted

    d)

    Either positive or negative depending upon frequency

    Ask AI

  6. Q1.6

    For a MOSFET, the pinch-off voltage is -3V. Gate to source voltage is 20V. W/L ratio is 5. Process transconductance parameter is 40$ \mu A/V^2 $. Find drain to source current in saturation.

    a)

    0.10 mA

    b)

    0.05mA

    c)
    • 0.05mA
    d)

    -50A

    Ask AI

  7. Q1.7

    For a MOSFET, the pinch-off voltage is -3V. Gate to source voltage is 20V. W/L ratio is 5. Process transconductance parameter is 40$ \mu A/V^2 $. Find drain to source current in saturation.

    a)

    1100 Ω\Omega

    b)

    11000 Ω\Omega

    c)

    900 Ω\Omega

    d)

    110 Ω\Omega

    Ask AI

  8. Q1.8

    The hybrid $ \pi $ model is used for

    a)

    Analysis of BJT for low frequency

    b)

    Analysis of BJT at high frequency

    c)

    Analysis of BJT for feedback

    d)

    Analysis of BJT for large signal

    Ask AI

  9. Q1.9

    Which oscillator is characterized by a split capacitor in its tank circuit?

    a)

    RC phase shift oscillator

    b)

    Colpitts oscillator

    c)

    Wien bridge oscillator

    d)

    none

    Ask AI

  10. Q1.10

    The gate voltage in a JFET at which drain current becomes zero is called

    a)

    pinch-off voltage.

    b)

    saturation voltage

    c)

    active voltage.

    d)

    cut-off voltage.

    Ask AI

Q.2 Solve this question :

Ask AI

  1. Q2.1

    Explain construction and working of Enhancement and Depletion type MOSFET.

    Ask AI

Q.3 Solve this question :

Ask AI

  1. Q3.1

    What is power amplifier. Explain Transformer coupled Class-A amplifier.

    Ask AI

Q.4 Solve this question :

Ask AI

  1. Q4.1

    Barkhausen criteria play an important role while designing Oscillator justify. Explain Hartley and RC phase shift Oscillator.

    Ask AI

Q.5 Solve this question :

Ask AI

  1. Q5.1

    Explain the effect of voltage series and voltage shunt feedback on gain & impedance of amplifier.

    Ask AI

Q.6 Solve this question :

Ask AI

  1. Q6.1

    The BJT is connected as a CE amplifier. Determine $ Z_i $, $ Z_0 $, $ A_v $, $ A_i $ hybrid model.

    Ask AI

Q.7 Solve this question :

Ask AI

  1. Q7.1

    Describe current mirror circuit in BJT. What are the condition to design current mirror circuit. Obtain the expression for current transfer ratio.

    Ask AI

Q.8 Solve this question :

Ask AI

  1. Q8.1

    Derive the expression for voltage gain and current gain and B.W of multistage amplifier.

    Ask AI

Q.9 Solve this question :

Ask AI

  1. Q9.1

    In brief explain the working of voltage series and current series circuit. Explain the same in case of BJT.

    Ask AI

2023V4104401

End Semester Examination - 2023 Semester-IV

03 Hours70 marks

Instructions

  • The marks are indicated in the right-hand margin.
  • There are NINE questions in this paper.
  • Attempt FIVE questions in all.
  • Question No. 1 is compulsory.

Q.1 Write the answer of the following (Any seven question only):

Ask AI

  1. Q1.1

    Which of these are incorrect about Darlington amplifier?

    a)

    It has a high input resistance

    b)

    The output resistance is low

    c)

    It has a unity voltage gain

    d)

    It is a current buffer

    Ask AI

  2. Q1.2

    What is a cascade amplifier?

    a)

    A cascade of two CE amplifiers

    b)

    A cascade of two CB amplifiers

    c)

    A cascade of CE and CB amplifiers

    d)

    A cascade of CB and CC amplifiers

    Ask AI

  3. Q1.3

    What is the output of a class B amplifier for sinusoidal input?

    a)

    Sinusoidal amplifier

    b)

    Half-sinusoidal

    c)

    Sinusoidal with higher frequency

    d)

    Square wave

    Ask AI

  4. Q1.4

    In a class B amplifier, it is found that DC power is 25W, find the ac power.

    a)

    10 W

    b)

    62.5 W

    c)

    25 W

    d)

    50 W

    Ask AI

  5. Q1.5

    In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called

    a)

    Positive feedback

    b)

    Negative feedback

    c)

    Cannot be predicted

    d)

    Either positive or negative depending upon frequency

    Ask AI

  6. Q1.6

    For a MOSFET, the pinch-off voltage is -3V. Gate to source voltage is 20V. W/L ratio is 5. Process transconductance parameter is 40$ \mu A/V^2 $. Find drain to source current in saturation.

    a)

    0.10 mA

    b)

    0.05mA

    c)
    • 0.05mA
    d)

    -50A

    Ask AI

  7. Q1.7

    For a MOSFET, the pinch-off voltage is -3V. Gate to source voltage is 20V. W/L ratio is 5. Process transconductance parameter is 40$ \mu A/V^2 $. Find drain to source current in saturation.

    a)

    1100 Ω\Omega

    b)

    11000 Ω\Omega

    c)

    900 Ω\Omega

    d)

    110 Ω\Omega

    Ask AI

  8. Q1.8

    The hybrid $ \pi $ model is used for

    a)

    Analysis of BJT for low frequency

    b)

    Analysis of BJT at high frequency

    c)

    Analysis of BJT for feedback

    d)

    Analysis of BJT for large signal

    Ask AI

  9. Q1.9

    Which oscillator is characterized by a split capacitor in its tank circuit?

    a)

    RC phase shift oscillator

    b)

    Colpitts oscillator

    c)

    Wien bridge oscillator

    d)

    none

    Ask AI

  10. Q1.10

    The gate voltage in a JFET at which drain current becomes zero is called

    a)

    pinch-off voltage.

    b)

    saturation voltage

    c)

    active voltage.

    d)

    cut-off voltage.

    Ask AI

Q.2 Solve this question :

Ask AI

  1. Q2.1

    Explain construction and working of Enhancement and Depletion type MOSFET.

    Ask AI

Q.3 Solve this question :

Ask AI

  1. Q3.1

    What is power amplifier. Explain Transformer coupled Class-A amplifier.

    Ask AI

Q.4 Solve this question :

Ask AI

  1. Q4.1

    Barkhausen criteria play an important role while designing Oscillator justify. Explain Hartley and RC phase shift Oscillator.

    Ask AI

Q.5 Solve this question :

Ask AI

  1. Q5.1

    Explain the effect of voltage series and voltage shunt feedback on gain & impedance of amplifier.

    Ask AI

Q.6 Solve this question :

Ask AI

  1. Q6.1

    The BJT is connected as a CE amplifier. Determine $ Z_i $, $ Z_0 $, $ A_v $, $ A_i $ hybrid model.

    Ask AI

Q.7 Solve this question :

Ask AI

  1. Q7.1

    Describe current mirror circuit in BJT. What are the condition to design current mirror circuit. Obtain the expression for current transfer ratio.

    Ask AI

Q.8 Solve this question :

Ask AI

  1. Q8.1

    Derive the expression for voltage gain and current gain and B.W of multistage amplifier.

    Ask AI

Q.9 Solve this question :

Ask AI

  1. Q9.1

    In brief explain the working of voltage series and current series circuit. Explain the same in case of BJT.

    Ask AI

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