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Basic Electronics Engineering (BXE)* Question Paper - Dec 18 - First Year Engineering (Semester 1) - Pune University (PU)
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Basic Electronics Engineering (BXE)* - Dec 18
First Year Engineering (Semester 1)
Total marks: 50
Total time: 2 Hours
Instructions to students:
(1) Figure ms to the right indicate full marks.
(2) Neat diagram must be drawn whenever necessary.
(3) Use of electronic pocket calculator is allowed.
(4) Assume suitable data if necessary.
(5) attempt Q.1. Or Q.2 , Q.3 or Q4 , Q.5 or Q.6 , Q.7 or Q.8.
1.a.
Explain with neat circuit diagram bridge rectifier with its input and output waveform.
(6 marks)
00
1.b.
What is d.c load line ? Explain the role of 'Q' point on d.c load line in BJT.
(6 marks)
00
OR
2.a.
Draw and explain the working principle of photodiode and LED among with it's characteristics.
(6 marks)
00
2.b.
Define $\alpha$,$\beta$ and $\gamma$ in CB.,CE,CC configuration in BJT if, $\beta$=100, calculate the value of a '$\alpha$'.
(6 marks)
00
3.a.
Draw the block diagram of op-amp and explain each block in brief.
(6 marks)
00
3.b.
State and prove Demorgens theorem.
(6 marks)
00
OR
4.a.
Fir inverting amplifier using op-amp , if R₁=100k$\Omega$. 
(6 marks)
00
i) Calculate output voltage.
ii) Is the result in part (i) practically possible? Justify.
4.b.
Implement half adder using gates , truth table and give equation fir sum and carry.
(6 marks)
00
5.a.
Define transducer. Enlist Various types of transducer. Explain with neat diagram the construction and working of LVDT.
(7 marks)
00
5.b.
Draw Instrumentation system and explain the function of each block.
(6 marks)
00
OR
6.a.
What are the types of temperature transducers. Explain in detail Thermocouple.
(7 marks)
00
6.b.
Explain the operation of SCR with the help of V-I characteristics
(6 marks)
00
7.a.
Draw the block diagram of communication system and explain each block in brief.
(7 marks)
00
7.b.
What is need of Modulation? Explain modulation index for AM and FM techniques.
(6 marks)
00
OR
8.a.
Write a short notes on Wired communication.
(7 marks)
00
8.b.
Draw and explain the block diagram if GSM.
(6 marks)
00
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