Basic Electronics Engineering (BXE) - Dec 2013

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) Draw the circuit of series negative clipper and explain its operation along with the waveform.(6 marks) 1 (b) Explain working of transistor as a switch.(4 marks) 1 (c) Define current amplification factor for CC, CB, CE configuration.(2 marks) 2 (a) Draw the waveform across R_L in clamping circuit.

Answer any one question from Q3 & Q4

3 (a) Draw and explain Internal block diagram of IC 555.(6 marks) 3 (b) Draw the schematic diagram & explain working of 4:1 mux and 1:4 demux.(6 marks) 4 (a) Find output voltage V_o of op-amp circuit shown in fig. Below:

Answer any one question from Q5 & Q6

5 (a) Draw and explain operation of SCR using two transistor equivalent circuit.(6 marks) 5 (b) Draw and explain block diagram of instrumentation system.(7 marks) 6 (a) Draw constructional diagram and explain working of V-I characteristic of Diac.(6 marks) 6 (b) Draw & explain the construction and operation of LVDT.(7 marks)

Answer any one question from Q7 & Q8

7 (a) Explain the elements of communication system with the help of block diagram.(7 marks) 7 (b) What is baseband communication. Explain limitation of baseband communication & explain need for modulation.(6 marks) 8 (a) Write the expression of Amplitude modulation. Define modulation index & draw waveform of AM.(6 marks) 8 (b) Draw & explain block diagram of GSM system.(7 marks)