Basic Electronics Engineering (BXE) - Jun 2015

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 and Q2

1 (a) Explain the working of positive clamper with its wavefoRMS.(6 marks) 1 (b) What is DC load line ? Explain the role of Q-point on DC load line.(6 marks) 2 (a) Explain the working of positive biased shunt clipper with its input and output wavefoRMS.(6 marks) 2 (b) Differentiate between CB, CE and CC configurations.(6 marks)

Answer any one question from Q3 and Q4

3 (a) In shown in the following Fig. let R1 = R2 = 1 kΩ , R3 = 5 kΩ, Rf = 10 kΩ, V1 = -1V, V2 = 2V and V3 = 4V. Calculate Vo. (6 marks) 3 (b) State the IC number for the following two input logic gate:
(i) AND
(ii) NAND
(iii) OR
(iv) NOR
(v) EX-OR
(vi) NOT(6 marks) 4 (a) Define the following parameters of op-amp:
(i) BW
(ii) PSRR
(iii) CMRR(6 marks) 4 (b) Draw the explain full adder using two half adder with its truth table.(6 marks)

Answer any one question from Q5 and Q6

5 (a) With a neat diagram explain the construction and working of LVDT. Give its advantages, disadvantages and applications.(7 marks) 5 (b) Draw a neat block diagram of a digital thermometer and explain its operation.(6 marks) 6 (a) Write a short note on Selection criterion for transducers.(7 marks) 6 (b) Compare:
i) SCR and TRIAC
ii) DIAC and TRIAC(6 marks)

Answer any one question from Q7 and Q8

7 (a) Draw and explain the electromagnetic spectrum or IEEE frequency spectrum. List its applications.(7 marks) 7 (b) Compare AM and FM.(6 marks) 8 (a) What is modulation? Explain AM technique in detail and write Am expression.(7 marks) 8 (b) Explain the basic structure of mobile phone system.(6 marks)