University of Sargodha BS 1* Term Examination 2016 Subject: I. I Paper: Basic Electronics (Phy-2210) Time ADowed: 2:30 Hours Maximum Marks: 80 Note: Objective part is compulsory. Attempt any four questions from subjective parts.
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Paper text
University of Sargodha
BS 1* Term Examination 2016
Subject: I. I Paper: Basic Electronics (Phy-2210)
Time ADowed: 2:30 Hours
Maximum Marks: 80
Note: Objective part is compulsory. Attempt any four questions from subjective parts.
Objective Part
Q. 1 Write short answers of the following questions in 2-3 lines only
(16 x 2 =
32)
Express proportional voltage formula for two resistances connected in series?
Why we need filters in the electronics circuits?
How Ohm's law can be expressed graphically for linear resistors?
4. Bricfly describe total internal reflection.
5. Can a transformer operate on DC?
What is difference between electron and hole?
л.
Why we use cells in series and parallel connection?
8. Mention at least five different energy sources
Я.
Give two applications of transformers
¡
10. Briefly describe how electrons are multiplied in photomultiplier tube?
11. Why optical fibers are better than metallic wires?
t2. Differentiate mobile charge carriers and immobile ions.
/13. What is the effect of doping level on width of depletion layer?
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On what facts inductance of an inductor depends?
J5. Define Silicon Controlled Rectifier with its symbolical representation?
146. Define ripple factor?
Subjective Part (4 x 12 =
48)
2. 2. Define modutation? Explain Frequency Modulation in detail
Q. 4
What is rectifier, draw circuit diagram of full wave bridge rectifier explain its working.
Draw and explain the Forward and reverse characteristic curve of PN-junction diode:
discuss on this graph Vor (barrier voltage) and Isat (saturation current).
Praw the transistor equivalent model of SCR, with the help of this model, explain the
working of SCR also mention its application.
0. 6 Compute (1) equivalent resistance (2)branched currents (3) voltage drops across each
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