Download AKTU B-Tech 4th Sem 2016-17 NEC 409 Analog Digital Electronics Question Paper

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NEC-409(A)

(Following Paper ID to be filled in your Answer Books)

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Paper ID : 131410

Roll No.

B.TECH.

Theory Examination (Semester-IV) 2015-16

ANALOG & DIGITAL ELECTRONICS

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Time: 3 Hours

Max. Marks : 100

Section-A

Q1. Attempt all parts. All parts carry equal marks. Write answer of each part in short. (2×10=20)

1. What are the different materials used for the manufacturing of LED?
2. What is the drawback in S-R flip-flop? How it can be eliminated?

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3. What are the various applications of the Multiplexer?
4. What are the differences between Combinational and Sequential logic circuits?
5. What is the principle of sinusoidal oscillator?

Section-B

Q2. Attempt any five questions from this section. (10×5=50)

1. What is a photodiode? Draw typical I-V characteristic curves at two illumination levels and explain how does it work as a photoresistor?

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2. Draw the logic diagram of a two-to-four line decoder using NOR gates only.
3. An RC coupled amplifier has a voltage gain of 1000, f1=50Hz and f2=200 KHz and a distortion of 5% without feedback. Find the amplifier voltage gain, f1, f2 and distortion when negative feedback is applied with feedback ratio of 0.01.
4. In the Colpitts oscillator, C1 and C2 are respectively 0.2 µF and 0.02 µF. If the frequency of oscillation is to vary between 750 kHz and 2050 kHz.
5. Find the characteristic equations of all flip-flops with the help of K-map.
6. Explain the working of the universal shift register.

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Section-C

Note: Attempt any two questions from this section. (15×2=30)

1. Q3. Discuss the current-voltage and capacitance-voltage characteristics and applications of the following:
   1. Varactor diode
   2. Tunnel diode
2. Q4. Draw the low frequency model of a transistor in CB and CE configuration and explain significance of each model.

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3. Q5.
   1. What is the problem associated with the JK flip flop? How it can be overcome? Explain with necessary diagrams.
   2. An 8-bit successive approximation ADC has a resolution of 20mV. What will be its digital output for an analog input of 2.17V?

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