Download VTU B-Tech/B.E 2019 June-July 1st And 2nd Semester 18 Scheme I8ELN14 Basic Electronics Question Paper

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First Semester B.E. Degree Examination, Dec.2018/Jan.2019

Basic Electronics

Time: 3 hrs.

18ELN14

Max. Marks: 100

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Note: Answer any FIVE full questions, choosing ONE full question from each module.

Module-1

1. 1. Explain the working of PN junction diode under forward and reverse biased conditions. (06 Marks)
   2. Explain how zener diode helps in voltage regulation with neat circuit diagram. (06 Marks)
   3. Explain with neat circuit diagram and waveforms the working of center-tap full wave rectifier. Show that efficiency of full-wave rectifier is 81%. (08 Marks)

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OR

2. 1. Explain the operation of half-wave rectifier with capacitor filter with neat circuit diagram and waveforms. (06 Marks)
   2. Show that the ripple factor of a half-wave rectifier is 1.21 and efficiency is 40.5%. (06 Marks)
   3. Explain VI characteristics of photodiode and its operation. (08 Marks)

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Module-2

3. 1. Explain the drain and transfer characteristics of a JFET with neat circuit diagram. (08 Marks)
   2. Explain the basic structure and operation of JFET with neat diagrams. (04 Marks)
   3. For a JFET IDss = 9 mA and VGSO(off) = - 8 V(max) determine drain current for VGS = 4V. (04 Marks)

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   4. For the circuit shown in Fig.Q2(d) find (i) current and voltages in the circuit for RL = 450 O. (04 Marks)

OR

4. 1. Explain the operation of an enhancement MOSFET with neat circuit diagram. (08 Marks)
   2. Explain CMOS as an inverter with neat circuit diagram. Give its equivalent circuit and its advantages. (06 Marks)

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   3. Explain VI characteristics of SCR. (06 Marks)

Module-3

5. 1. Explain the block diagram of an operational amplifier. (08 Marks)
   2. Explain the operation of an op-amp as a non-inverting amplifier with neat diagram and waveforms. (06 Marks)

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   3. Define the following terms with respect to op-amp.
      1. CMRR
      2. Slew rate
      3. pp offset voltage and current
      4. pp bias current
      (08 Marks)

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OR

6. 1. Explain op-amp as a subtractor with neat circuit diagram. (06 Marks)
   2. Explain the different iv modes of an op-amp. (08 Marks)
   3. For an op-amp circuit shown in Fig.Q6(c), find the output Vo 1 and Vo 1.
      

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