Basic Electronics BS 1 Semester/Term University Of Sargodha (UOS) 2016

Subject: 1.1

University of Sargodha

BS 1" Term Exam 2016

Paper: Basic Electronics (Pho-2210)

Time Allowed: 2:30 Hours

Maximum Marks: 80

Note: Objective part is compulsory. Attempt any four questions from subjective parts.

Obiective Part

Q1. Write short answers of the following questions in 2-3 lines only

(16 1 2 -

32)

1. Express proportional voltage formula for too resistances connected in series?

2. Why we need filters in the clectromes circus?

3. How Ohm's fat, can be expressed graphically for lineat resistors"

4. Bret de Chhe total miernal reflection

s. canarinstormer operate on DC?

That is difference beteen electron and hole?

8. Mention at least fire different energy soureos

Why we use cells in series and parallel come@@. COM

9. Cove moo applications of transformers 9

I0. Brells describe hom electrons are multiplied in photomuluplier tube?

11. Why optical fibers are better than metallc wires?

12. Deferentrate mobile charge carriers and immobile ions

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13. What is the ellect of doping level on width of depletion layer?

14. On what facts inductance of an inductor depends?

15. Detine Silicon Controlled Rechlier with sumbolical representation?

16. Define ripple factor'

Subjective Part (14 x 12 =

48)

Q2. Define modulation? Explain Frequency Modulation in detail

Q3. What is rectifier, draw circuit diagram of full wave bridge reculier explain its working

Q4. Draw and explain the Forward and reverse characteristic curve of PN-Junction diode.

discuss on this graph Vor (barrier voltage) and la (saturation current)

Q5. Draw the transistor and equivalent model of SCR. with the help of this model. explain the working of

sC R also mention its application

•

Q6. Compute ti) equivalent resistance (2) branch currents (3) voltage drop across cach resostance

8 K

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20 K

15 V

8

6 K

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D

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8 K

F

10 K

E.

1

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5 K

G

0%.

#rite a note on the charactenstics of celle in senes and parallel connection

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