pue.kar.nic.in II PUC Exam Electronics Question Paper : Karnataka Pre-University Education

Organization : Karnataka Department of Pre-University Education
Exam : II PU Electronics
Document type : Question Paper
Website : pue.kar.nic.in

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PUE Karnataka Electronics Question Paper

Time : 3 Hours 15 Minutes
Max. Marks : 90

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March 2010

Note :
i) The question paper has four Parts A, B, C & D.
ii) Question No. 23 in Part C and Question No. 32 in Part D are
iii) Read the instructions given for each Part.

PART – A
Note : Answer all questions. 10 × 1 = 10
1. Mention moderately doped region of a Transistor.
2. What is direct coupling –
3. What happens to the output impedance with negative voltage series
4. Draw the output waveform of Differentiator when sine wave input is
5. What is the value of feedback fraction of Wien-bridge oscillator –
6. Define signal to noise ratio.
7. In AM modulation the Signal Amplitude is 15 mV and Carrier Amplitude is
30 mV. Find modulation index.
8. Write the Boolean expression for two input of XOR gate.
9. Give an example for non-weighted code.
10. Expand MTSO.

PART – B
Note : Answer any ten questions. 10 × 2 = 20
11. Write the three operating regions of a transistor. Which region is used in
12. A transistor has ß = 100, if base current is 50 µA. Determine the collector
13. Why do we need multistage amplifier – Write the expression for overall
14. Distinguish between negative feedback and positive feedback.
15. Draw the circuit diagram of op-amp integrator and write the output voltage
16. State Barkhausen criterion for sustained oscillations.
17. Mention the layers of the ionosphere.
18. Calculate the carrier swing of FM wave for the frequency deviation 5 kHz.
19. Draw the circuit diagram of linear diode detector.
20. Write the logic symbol and Boolean expression for two input NAND gate.

PART – C
I. Answer the following question : 1 × 4 = 4
23. Using the following data, calculate the theoretical and experimental
24. Explain the working of NPN transistor with neat diagram.
25. A multistage amplifier has the individual voltage gains of 50, 100 and
26. Derive an expression for the output impedance of voltage series
27. Derive an expression for output voltage of an op-amp inverting
28. Explain the working of Hartley oscillator with neat circuit diagram.

PART – D
I. Answer the following question : 1 × 6 = 6
32. Write the pin diagram of IC 7400. Realise NOT, OR and AND gates
33. a) Classify the amplifiers based on configuration and write their
34. a) What is photo-transistor – Write the symbol and any two uses of
b) An amplifier has lower cut-off frequency 500 Hz and upper cutoff
35. a) Find the output voltage for the following circuit diagram :
b) Write the Ideal characteristics of an ideal op-amp. 4 + 2
36. a) With a neat circuit diagram, explain the working of RC phase

June/July 2010

Part – A :
Note : Answer all questions.
1. Which region of a transistor is moderately doped ?
2. Write one application of CC amplifier.
3. Define closed loop gain.

4. What is a comparator ?
5. What should be the minimum voltage gain of an amplifier in the case of Wien-bridge oscillator to produce sustained oscillation ?

6. Define signal to noise ratio.
7. A carrier is frequency modulated by a signal of frequency 5 kHz to a depth of 4. What is its frequency deviation ?

8. What is an XNOR gate ?
9. Mention the basic function of transponder.

PART – B
Note : Answer any ten questions.
10. Explain the need for biasing a transistor.
11. Draw the circuit diagram of opto-coupler.

12. The current gain of a transistor in CB mode is 0·995 and its base current is 20 μA. Calculate its collector current.
13. Distinguish between negative feedback and positive feedback.

14. The output voltage of an amplifier reduces to 0·8 V when a negative feedback of 2% is employed. If the net input voltage of the amplifier is 100 mV, calculate gain of the amplifier without feedback.

15. Define slew rate of an operational amplifier. Write any two characteristics of an ideal op-amp.
16. Briefly explain how an ionosphere helps in transmitting radio signals over large distance.

17. Mention any four reasons for modulating a radio signal.
18. What is a weighted code ? Give an example.
19. What is Metropolitan Area Network ( MAN ) ? Write one advantage of voice mail.