Basic Electronics Engineering (BXE) : Question Paper Apr 2013 - First Year Engineering (Semester 2)

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Basic Electronics Engineering (BXE) - Apr 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) Sketch I_R and V_O w. r .t time for the network shown in fig. A. Assume both the diodes are silicon type with V_f=0.7 V

(6 marks) 1 (b) For a BJT as a switch why CB and cc configurations are not preferred.(2 marks) 1 (c) Explain how R_i and R_o affect the performance of the BJT voltage amplifire.(4 marks) 2 (a) Explain with V-I characteristics the working of zener diode as voltage regulator.(6 marks) 2 (b) In the voltage amplifire shown in Fig B, V_s=100m V R_s=50 Ω
(i) Calculate input voltage V_i if the input resistance R_i is 600 Ω
(ii) What should be the value of R_i to get V_i=75 mV.

(6 marks)

Answer any one question from Q3 & Q4

3 (a) In fig. C if V_a=+2V V_b=+4V
R_a=R_b=R₁ = 1K Ω and R_f=3 k Ω determine the voltage V₁ at non-inverting terminal of OP-AMP and out voltage V₀

(4 marks) 3 (b) Draw the block diagram of full adder using two half adder, explain its working with proper expression for sum and carry.(6 marks) 3 (c) Explain how EX-OR gate can be used as an invertor.(2 marks) 4 (a) With neat waveform explain IC555 in astable mode.(6 marks) 4 (b) Implement the following logic expression with minimum number of NAND gate
(i) y₁=B(D +C D)
(ii) y₂=AB+CD+B C(6 marks)

Answer any one question from Q5 & Q6

5 (a) Explain in detail, the selection criteria for transducer.(6 marks) 5 (b) Explain in detail
i) construction of TRIAC
ii) characteristics of TRIAC
iii) modes of oper Ation(7 marks) 6 (a) Explain with block diagram an electronic weighing machine.(6 marks) 6 (b) Explain the construction of DIAC w.r.t
i) Characteristics
ii) Application(7 marks) 7 (a) What is the importance of modulation index. Draw the AM waveform for
i) Liner modulation
ii) Over modulation
iii) Modulation index = 0(8 marks) 7 (b) Explain the basic structure of mobile phone system.(5 marks) 8 (a) With respect to FM explain
i) Frequency deviation
ii) Modulation index
iii) Deviation ratio
iv) Frequency spectrum of FM(8 marks) 8 (b) Write a note on co-axial cable and optical fibre cable.(5 marks)

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