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Download SGBAU BSc 2019 Summer 3rd Sem Electronics Devices n Circuits Question Paper

Download SGBAU (Sant Gadge Baba Amravati university) BSc 2019 Summer (Bachelor of Science) 3rd Sem Electronics Devices n Circuits Previous Question Paper

This post was last modified on 10 February 2020

This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university


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B.Sc. Part-II (Semester-III) Examination

ELECTRONICS

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(Electronics Devices and Circuits)

Time : Three Hours] [Maximum Marks : 80

Note :— (1) Question No. 1 is compulsory.

(2) Draw neat diagrams wherever necessary.

  1. (A) Fill in the blanks with correct word : 2
    1. In ideal Op-Amp value of input impedance is __________
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    3. Bistable multivibrator has __________ stable states.
    4. D/A is known as __________
    5. Voltage gain of Non-inverting amplifier is __________
  2. (B) Choose the correct alternative : 2
    1. In ideal Op-Amp bandwidth is :
      1. Zero
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      3. Minimum
      4. Infinite
      5. None
    2. The monostable multivibrator has __________ stable state(s).
      1. 2
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      3. 1
      4. 3
      5. 4
    3. One of the following is not an oscillator :
      1. Colpitts
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      3. Wein bridge
      4. Push pull
      5. Hartley
    4. Op-Amp IC 741 has total __________ pins.
      1. 2
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      3. 6
      4. 14
      5. 8
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  4. (C) Answer the following questions in ONE sentence : 4
    1. What is feedback ?
    2. List the hybrid parameters.
    3. Define CMRR.
    4. What is oscillator ?
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EITHER

  1. (A) Give the advantages and disadvantages of direct coupled amplifier. 4
  2. (B) Draw hybrid equivalent circuit for CE transistor amplifier and derive the expression for
    1. Current gain
    2. Input impedance for CE-transistor amplifier. 8
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OR

  1. (P) Explain the working of single tuned amplifier with circuit diagram.
  2. (Q) State the advantages and disadvantages of RC coupled amplifier. 4

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  1. (A) Explain the construction and working of Class B push pull amplifier. Find its efficiency. 8
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  3. (B) Explain cross over distortion. How it is eliminated ? 4

OR

  1. (P) Draw a circuit diagram of transformer coupled Class A amplifier and derive expression for its efficiency. 8
  2. (Q) Give the classification of amplifiers. 4

EITHER

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  1. (A) Explain Barkhausen criterion for sustained oscillations. 4
  2. (B) Explain the construction and working of Hartley oscillator. 8

OR

  1. (P) Explain the construction and operation of RC-phase shift oscillator using transistor. State its advantages. 8
  2. (Q) State the advantages of negative feedback. 4
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EITHER

  1. (A) Explain the working of Op-Amp as non-inverting amplifier and derive the expression for voltage gain. 6
  2. (B) With suitable diagram explain the working of Op-Amp as summing amplifier. 6

OR

  1. (P) Explain the concept of virtual ground in Op-Amp. 4
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  3. (Q) Define :
    1. Common mode voltage gain
    2. Differential mode voltage gain.
  4. (R) Draw the block diagram of Op-Amp and explain the function of each block. 6

EITHER

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  1. (A) Explain the construction and working of Op-Amp as a monostable multivibrator. 6
  2. (B) Explain how Op-Amp is used as damped harmonic oscillator. 6

OR

  1. (P) Explain the working of Op-Amp as a Schmitt Trigger. 6
  2. (Q) Explain the working of Op-Amp as an astable multivibrator. 6
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EITHER

  1. (A) Explain the working of successive approximation type A/D converter. 8
  2. (B) Explain the terms
    1. D/A Accuracy
    2. D/A Resolution. 4
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OR

  1. (P) Describe the construction and working of Weighted Resistor type D/A Converter. 6
  2. (Q) Explain the need of D/A and A/D converter. 4
  3. (R) What is A/D and D/A converter ?

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This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university