Basic Electronics Engineering (BXE) - May 2014

First Year Engineering (Semester 2)

TOTAL MARKS: 50
TOTAL TIME: 2 HOURS (1) Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8
(2) Assume suitable data, if necessary.

Answer any one question from Q1 & Q2

1 (a) Explain Voltage tripler and quadrupler circuit.(6 marks) 1 (b) Explain input output characteristics of CE amplifier.(6 marks) 2 (a) Explain working principle of photo diode with characteristics. Why photodiode is operated in reverse biased mode when used as a optical detector.(6 marks) 2 (b) Explain Drain Characteristics of an n-channel enhancement type MOSFET.(6 marks)

Answer any one question from Q3 & Q4

3 (a) Draw the circuit diagram and write the output equation for
i) Inverting summer with three inputs
ii) Ideal differentiator.(6 marks) 3 (b) Explain the operation of Multiplexer and Demultiplexer(6 marks) 4 (a) Draw three pin IC voltage regulator. Define load and Line regulation.(6 marks) 4 (b) Implement the following with minimum number of NAND gates.
i) y=AD+CB
ii) z=A(B+CD)(6 marks)

Answer any one question from Q5 & Q6

5 (a) Explain with block diagram Digital Thermometer.(7 marks) 5 (b) Explain construction of SCR.(6 marks) 6 (a) Explain various criteria used to select a transducer.(7 marks) 6 (b) Explain Characteristics of DIAC.(6 marks)

Answer any one question from Q7 & Q8

7 (a) Give advantages, disadvantages and applications of Co-axial cable.(6 marks) 7 (b) Explain the block diagram of GSM system.(7 marks) 8 (a) Define Modulation index with reference to AM and FM. Draw AM waveform for overmodulation case.(6 marks) 8 (b) Write a note on Optical Fiber and explain how light travels through a fiber.(7 marks)