8marks

Unit 1

1. Explain the construction and working of a TRIAC (2012)

2. Explain the working principle of static RAM and dynamic RAM (2012)
3. Explain how SCR is used for power control. (2013)
4. Explain the working of UJT as a relaxation oscillator. (2013)
5. Write a short note on programmable memory devices. (2015)
6. Describe briefly the construction and working of FET amplifier. (2015)
7. Calculate the intrinsic stand-off ratio for the given UJT circuit as relaxation oscillator and thus
calculate the frequency of the output wave. (Diagram)
8. Briefly explain charge coupled devices.
9. Calculate the intrinsic stand-off ratio for the given UJT circuit an relaxation oscillator and thus
calculate the frequency of the output wave.
10. Discuss the Characteristics of SCR
11. Explain about the characteristics of FET.
12. Describe CMOS and NMOS techniques.
13. What is an SCR? How does it control the power fed to the load?
14. A UJT relaxation oscillator uses a variable resistor Re to change the frequency of pulses
delivered at Vout. The variable resistor is initially set at 5 kilo ohm and is then adjusted to 10
kilo ohm. The UJT has R-33 2, R2-330 2. C=0.2 µF and η=0.54. Determine the frequency of
the voltage spikes produced for 5 kilo ohm setting and 10 kilo ohm setting.

Unit 2

1. Explain the function of a photo detector constructed using diode (2012)

2. Discuss the working of a diode laser (2012)
3. What is solar cell? Explain its operation. (2013)
4. What is klystron? Explain how it works? (2013)
5. Give the theory and operation of Diode LASERS. (2015)
6. Explain the principle and working of LED with neat diagram. (2015)
7. Discuss the working of diode laser. (2019)
8. Describe the working of IMPATT diode. (2019)
9. what are requirments of photonic device?
10. Describe the working of gunn diode
11. Discuss about fill factor and its significance in a solar cell.
12. Explain about light confinement factor.
13. Discuss the working principle and construction of Gunn diode.
14. What is the underlying principle of operation of a diode photo detector? Explain any two of
its applications.

Unit 3

1. Design a 3 bit synchronous counter (2012)

2. What are registers? How do you enter '1011' into a 4 bit shift register? (2012)
3. What is a Shift register? Give its application. (2013)
 4. Explain the working of divided by 2N counter. (2013)
5. Explain the working of 4 bit ripple counter with truth table and waveforms. (2015)
6. Give the working of serial in and serial out shift register with block diagrams and truth table.
(2015)
7. Explain the working of non-binary counter.
8. Discuss the working of shift register.
9. Explain the working of shift register
10. Explain the working of synchronous counter
11. Discuss the working of BCD counter.
12. Explain the working of shift counter.
13. Draw the circuit of a 4-bit asynchronous counter using JK flip- flops and explain their
working.
14. Design a synchronous counter for the sequence 0, 2, 4. 5, 1 using JK flip-flops.

Unit 4

1. Explain the function of the sample and hold circuit (2012)

2. Explain the working of a second order active filter (2012)
3. Explain the "one-shot" pulse generator using 555 timer. (2013)
4. Discuss how analog differentiation is achieved using an Op-amp (2013)
5. Explain the working of low pass and high pass active filters using Op omp. (2015)
6. Explain the construction and working of Astable Multivibrator using 555 timer. (2015)
7. Design a op-amps circuit to solve the simultaneous equations, x + y 3 and 2x+3y-7.
8. Explain the working of 555 timer as a stable multi vibrator.
9. Design a op-amps circuit to solve the simultaneous equations, 4x+y-1 and 6x-5y=9
10. Explain the working of 555 timer as mono stable multi vibrator.
11. How is a 555 timer used as astable multi vibrator?
12. What is phase locked loop?
13. Describe the method for solving a second order differential equation using IC 741. (OR)
14. Compare and contrast wide band and narrow band reject filters.

Unit 5

1. Explain the working of logarithmic amplifier (2012)

2. Explain the function of precision rectifier (2012)
3. Explain the working of a Half wave rectifier. (2013)
4. Discuss the working of R-2R ladder D/A converter. (2013)
5. Describe briefly half wave and full wave rectifiers with necessary circuit diagram (2015)
6. Explain with neat circuit diagram the working of Dual slope A/D converters (2015)
7. Explain the working of R-2R ladder D/A converter.
8. Describe the working of successive approximation A/D converter.
9. Explain the working of dual slope A/D converter
10. Describe the working of binary weighted D/A converter.
11. Explain the working of precision comparator.
12. How does a half wave rectifier work?
13. With a neat circuit, explain the working of a 4-bit binary R-2R ladder D/A converter.
14. Discuss the working of a successive approximation A/D converter.