Suman shakid University of Sargodha BS 15 Term Examination 2015 Subject: Computer Science Paper: Basic Electronics (Phy-2210)
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Paper text
Suman
shakid
University of Sargodha
BS 15 Term Examination 2015
Subject: Computer Science
Paper: Basic Electronics (Phy-2210)
Time Allowed: 2:30 Hours
Maximum Marks: 80
Note: Objective part is compulsory. Attempt any four questions from subjective parts.
Objective Part
(Compulsory)
0.1. Write short answers of the following questions in 2-3 lines only
(16*2 =
32)
d
i.
Explain effect of doping on semiconductor.
Why it is necessary to choose a reference point in measuring voltage of a given circuit?
111.
/ 1V.
$ v.
/
vi.
vii.
vili.
(ix.
A X.
Dit entire early bind the egar andent of tear restors connected in series
Why we need transistor biasing?
What is inductor? Why we use it in electronic circuits?
Mention at least five different energy sources
Why we need filters in the electronics circuits?
Define junction breakdown? How many junction breakdown occur in PN-junction?
Define Silicon Controlled Rectifier (SCR)?
Discuss difference between insulator and conductor?
eXii.
xili.
Kiv.
/ xv.
/
xvi.
Why we need cells in parallel and series connections?
Differentiate between permanent and temporary magnet?
Define ionization energy.
What is SCR? Draw its symbol.
Why insulators can't conduct electricity.
2.2.
03.
Q.4.
Q.5.
2.6/4)
1b)
97.
Subjective Part (4*12 =
48)
Explain the construction and working of PN junction photodiode also write down its
applications.
Discuss Light Emitting Diode (LED) in detail?
What is rectifier? Draw the circuit diagram of full-wave (center taped transformer) rectifier,
also find Voc and IDc.
Draw the transistor equivalent model of SCR, with the help of this model, explain the
working of SCR also mention its application.
Define drift current? Explain drift current in good conductors.
Differentiate mobile charge carriers and immobile ions.
(6)
(0)
What is modulation? Explain Frequency modulation
visIt website: ustadni.com
(12)