Basic Electronics 2014 – BSc Computer Science Part 1

Paper Code: 13507
1507
B.sc. (Computer Science) (Part 1)
Examination, 2014
Paper No. 3.1
BASIC ELECTRONICS

Time: Three Hours] [Maximum Marks: 33

Note: Attempt all the five questions.

1. (a) Describe Kirchhoff current and voltage laws.

(b) What is P.N. Junction diode? Discuss V.I. characteristics of P.N. junction diode. Discuss the reasons, why is the rapid increment of current at the certain voltage in reverse biasing.

2. (a) What is Transistor? Describe the working of N-P-N transistor.

(b) Using Norton’s theorem find the current in 8Ω resistor in the network following figure:

3. (a) Describe construction and working of Wien’s bridge oscillator.

(b) In a negative feedback amplifier, the gain without feedback is 100, feedback ratio is and input voltage is 50 mV. Determine:

1. Gain with feedback
2. Feedback factor
3. Output voltage

4. (a) Describe L.E.D. with neat diagram.

(b) Define Resistor, Inductor and Capacitors. What is time constant in R.C. circuit?

5. Attempt all the five objective type questions and choose the correct option.

(a) Kirchhoff’s voltage law is connected with:

1. IR drops
2. Battery e.m. fs.
3. Junction voltage
4. Both (a) and (b)

(b) A crystal diode has:

1. One p-n junction
2. Two p-n junction
3. Three p-n junction
4. None of these

(c) A.C. load line is …………… than D.C. load line.

1. Thick
2. Steeper
3. Thin
4. None of these

(d) Positive feedback is used in:

1. Rectifier
2. Oscillator
3. Amplifier
4. Detector

(e) The most commonly used material for making transistor is:

1. Copper
2. Ebonite
3. Silicon
4. Silver

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