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Posted By: yamini Member Level: Gold Posted Date: 14 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech II II Basic electronics aug/sep 2007 set 1 Question paper
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Code No: R05220301 Set No. 1
II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007
BASIC ELECTRONICS
( Common to Mechanical Engineering and Production Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Define mean life time of a carrier.
(b) Draw the forward and reverse bias characteristics of a p - n junction diode
and explain them qualitatively.
(c) Compare the merits and demerits of H.W. Rectifier, Full Wave Rectifier and
Bridge rectifier. [2+8+6]
2. (a) Explain various current components in a PNP transistor with forward biased
emitter junction and reverse biased collector junction
(b) Draw the structure and explain the Gate and drain characteristics of n- channel
J F E T [8+8]
3. (a) Name di erent methods of turning-on of SCR.
(b) What are the important points to be noted while designing the gate-control
circuit of SCR.
(c) Draw and explain the V-I characteristics of SCR. [2+6+8]
4. (a) Draw the black diagram for the four basic methods of connecting the feedback
signal. Compare the input and output impedances of the above four types of
feedback.
(b) State the merits and demerits of negative feedback in amplifiers. [10+6]
5. (a) Draw the circuit of transistor Colpitts Oscillator and briefly explain the work-
ing of it. Derive the expression for frequency of oscillation fo.
(b) Calculate the frequency of oscillation of a transistor Colpitts Oscillator having
C1 = 0.02 µF, C2 = 0.2 µF and L = 10 µH. [10+6]
6. (a) Draw the circuit required for A.C. resistance welding and explain the process
of welding.
(b) Explain the spot welding process giving necessary diagram. [8+8]
7. (a) Giving basic set up, explain the principle of Induction heating.
(b) Draw and explain piezo electric generator circuit using Hartley oscillator for
generation of Ultrasonic waves. [8+8]
8. Write short notes on:
(a) Ramp type A to D converter
(b) General purpose registers of 8085. [10+6]
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