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Basic Electronics Engineering (BXE) : Question Paper Dec 2015 - First Year Engineering (Semester 1) | Pune University (PU)

## Basic Electronics Engineering (BXE) - Dec 2015

### First Year Engg (Semester 1)

TOTAL MARKS:
TOTAL TIME: HOURS

### Solve any one question from Q1 and Q2

1 (a) Compare Half Wave and Full Wave Rectifier.(6 marks) 1 (b) Explain operation of n-channel enhancement type MOSFET with its characteristics.(6 marks) 2 (a) Determine output waveform for the circuit shown in figure: (6 marks) 2 (b) Draw the output characteristics of BJT in CE configuration. Indicate all the three regions of operation on it. Explain the operation of BJT as a switch.(6 marks)

### Solve any one question from Q3 and Q4

3 (b) Draw the circuit diagram and write output equation for:
i) Non-inverting summer with three inputs
ii) Ideal Differentiator.
(6 marks)
3 (b) Compare Microprocessor and Microcontroller.(4 marks) 3 (c) Prove the following using De Morgan's Theorem: $\overline {(A+B) \cdot (C+D)} = (\overline A \cdot \overline B) + (\overline C \cdot \overline D)$.(2 marks) 4 (a) For inverting amplifier using op-amp if Rf=100 kΩ, R1=10 kΩ, VCC= ±10 V, Vi=2V d.c:
i) Calculate output voltage
ii) Is the result in part (i) is practically possible? Justify.
(6 marks)
4 (b) How to implement full adder using 2 half adder and logic gates? Explain.(6 marks)

### Solve any one question from Q5 and Q6

5 (a) Draw Block diagram of electronic weighing machine and explain its operation.(6 marks) 5 (b) Explain the construction of DIAC. Draw and explain its characteristics.(7 marks) 6 (a) Explain digital thermometer with block diagram.(6 marks) 6 (b) Define the following terms for SCR:
(i) Holding current
ii) Latching current
iii) Forward breakover voltage
iv) Reverse breakover voltage
v) Turn ON time for SCR.
(5 marks)
6 (c) List applications of SCR.(2 marks)

### Solve any one question from Q7 and Q8

7 (a) What is need of modulation? Explain frequency modulation in detail.(7 marks) 7 (b) Draw and explain block diagram of mobile communication system.(6 marks) 8 (a) Draw AM waveform for:
i) Modulation index = 1
ii) Modulation index > 1
iii) Modulation index < 1.
(3 marks)
8 (b) Write short notes on:
i) Twisted Pair Cable
ii) Fiber Optic Cable.
(6 marks)
8 (c) Compare amplitude modulation and frequency modulation.(4 marks)
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