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JNTU B.Tech II ELECTRONIC DEVICES AND CIRCUITS Previous Question Paper (February - 2024 - R15)

B.Tech | II | II-I | R15 | February - 2024

Answer PaperPaper Code: 123AUMaximum Marks: 75Time: 3 Hours

Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.

Part A

125 marks

Explain the difference between ideal operation and practical operation of the P-N junction diode using I-V Characteristics.

2 marks

Answer

An ideal diode acts as a perfect switch: zero resistance in forward bias and infinite resistance in reverse bias, with a sharp transition at zero voltage. A practical diode exhibits a threshold voltage (cut-in voltage) of approximately 0.7V for Silicon, has finite forward resistance, and shows a small reverse saturation current due to minority carriers before reaching the breakdown region.

Illustrate the V-I characteristics of Tunnel diode.

3 marks

Answer

The V-I characteristic of a tunnel diode is non-monotonic, showing a region of negative differential resistance. As forward voltage increases, current rises to a peak point, then decreases to a valley point due to quantum mechanical tunneling, and finally increases again following standard diode behavior.

What do you understand by the term “Rectifier”? What is the need of Rectifier in the circuit operation?

2 marks

Answer

What is the voltage breakdown phenomenon of the diode? Tell how the supply can be regulated?

3 marks

Answer

Show the schematic of the n-p-n Transistor. What do you understand by Uni-polar and Bi-polar Transistor.

2 marks

Answer

Compare the gains of the CB, CE and CC amplifier. Show the relationship between the gains of different amplifier configurations.

3 marks

Answer

Interpret the DC load line and AC load line, to define the operating point of the transistor.

2 marks

Answer

Compare the fixed bias and voltage divider bias in terms of various input output Parameters.

3 marks

Answer

Illustrate the pinch-off process in the field effect transistor.

2 marks

Answer

Compare FET and BJT.

3 marks

Answer

Part B

210 marks

Analyze the operation of P-N junction diode with no applied voltage or open circuit condition with suitable diagram distribution of voltage, charge and electric field.

5 marks

Answer

Solve for new nominal zener potential at 100℃, if zener breakdown voltage (Vz) is 10V, and the temperature coefficient is 0.0072V.

5 marks

Answer

310 marks

Analyze the operation of P-N junction diode with forward bias condition with suitable diagram distribution of voltage, charge and electric field.

5 marks

Answer

Justify that the forward current of the p-n junction diode is dependent on reverse Saturation current and temperature.

5 marks

Answer

410 marks

Give the Analysis of full wave rectifier with the help of circuit diagram and input-output waveforms.

5 marks

Answer

Prove that the ripple factor of half wave rectifier is higher than that of full wave rectifier.

5 marks

Answer

510 marks

Prove that the maximum efficiency of the full wave rectifier is 81.2%.

5 marks

Answer

Construct the Bridge rectifier circuit using diodes and explain the working for both positive and negative half cycle.

5 marks

Answer

610 marks

Examine the operation of the transistor as an amplifier. Also show the operating region, in which the transistor is used as an amplifier.

5 marks

Answer

Explain the Small signal low frequency transistor model of BJT.

5 marks

Answer

710 marks

Discuss the three different operating regions of the transistor on the input output characteristic graph and also show the difference between them.

5 marks

Answer

Explain a transistor amplifier using h-parameter model.

5 marks

Answer

810 marks

Elaborate the need of Transistor biasing with the help of characteristic curve.

4 marks

Answer

Discuss the “stability” of the transistor. Derive the equation for stability factor of the transistor.

6 marks

Answer

910 marks

Analyze the operation of Emitter feedback bias circuit with the help of circuit diagram. Also give the merits and demerits of Emitter feedback bias circuit.

5 marks

Answer

Analyze the operation of Collector feedback bias circuit with the help of circuit diagram. Also give the merits and demerits of Collector feedback bias circuit.

5 marks

Answer

1010 marks

Apply the voltage Vds in FET and keep the Vgs constant. Explain the working of the FET for the above said condition.

5 marks

Answer

Utilize the Drain characteristics of n-channel JFET and explain the pinch-off region and breakdown region in n-Channel JFET.

5 marks

Answer

1110 marks

Classify the MOSFET in terms of the channels between source and drain. Also explain why it is called as voltage-controlled capacitor.

5 marks

Answer

Distinguish between the depletion type and enhancement type p-channel MOSFET with the help of construction and I-V characteristics.

5 marks

JNTU B.Tech II ELECTRONIC DEVICES AND CIRCUITS Previous Question Paper (February - 2024 - R15)

Part A

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Part B

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