IBST 203 BASIC ELECTRONICS , Punjab Technical University Question Paper

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Roll No. .................

Total No. of Questions : 13]                                                            [Total No. of Pages : 02

Paper ID [A2008]

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IBST 203(O) (Sem. - 2nd)

BASIC ELECTRONICS

Time : 03 Hours                                                                               Maximum Marks : 75

Instruction to Candidates:

1) Section - A is Compulsory.

2) Attempt any Nine questions from Section - B.

Section - A

Q1)                                                                                                             (15 x 2 = 30)

a) Define the term semi-conductor.

b) What is the relationship between resistance, current and voltage?

c) What is the use of diode?

d) What is the difference between PNP and NPN transistor?

e) List two applications of transistors.

f) What do you understand by the term band structure?

g) What do you understand by the term valence band?

h) What is the working principle of oscillator?

i) What is the role of amplifiers in electronic devices?

j) Define the term ripple voltage.

k) How would adding a 20-Ω resistor in parallel with a 100-Ω resistor change the reading on an ammeter?

l) When measuring DC voltage across a device with a multimeter, the meter indicates 0 volts? What is one possible explanation for this reading?

m) List examples of passive electronic components.

n) List the advantages of resistive voltage divider.

o) What devices are used to convert direct current to alternating current and vice-versa?

Section - B

(9 x 5 = 45)

Q2) Discuss in detail energy bands in solids.

Q3) Explain the significance of various amplifiers in detail.

Q4) What is Bipolar Junction Transistor? List applications of BJT.

Q5) Discuss working principle of a P-N junction diode. Also show its characteristics and mention some of its applications.

Q6) A germanium diode has a saturation current of 10–8 A. Calculate junction current for a forward bias of 0.40 volts and at 300° K.

Q7) Explain in detail diode as a rectifier.

Q8) Discuss the working of transistor as an amplifier.

Q9) Explain in detail with a suitable example resistive voltage divider.

Q10)Comment on the statement “Inductive Reactance is a function of frequency”.

Q11)Discuss basic circuit design with example.

Q12)Write a short note on semi-conductor devices.

Q13)Discuss the working of transistor as an oscillator.