LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PHYSICS
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THIRD SEMESTER – November 2008
PH 3502 – ELECTRONICS – I
Date : 06-11-08 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A (10 x 2 = 20)
Answer ALL questions
- What is a current source?
- State maximum power transfer theorem.
- What is quiescent (Q) point?
- Mention any two uses of a Bistable multivibtator.
- Mention the characteristic features of OP-AMP.
- Draw the circuit of OP-AMP summing amplifier for four input.
- What is k-map?
- Draw the logic circuit for clocked RS flip-flop and give its truth table.
- What is a register?
- What are the difference between ROM and RAM?
PART – B (4 x 7.5 = 30)
Answer any FOUR questions
- State and prove Norton’s theorem.
- With necessary circuit explain the fixed bias circuit and derive the equation for its stability.
- Draw the inverting Op-Amp circuit and derive the equation for its ideal closed loop gain.
- Write a note on multiplexing and demultiplexing.
- Explain the function of a decade counter with logic circuit and truth table.
PART – C (4 x 12.5 = 50)
Answer any FOUR questions
- The h-parameters of a transistor in CE configuration are h fe=330, h ie=4.5 kilo ohm, h re=0.0002 and h oe=0.000030 mho, if the load resistance is 5 kilo-ohm and the internal resistance of the signal source is 10 kilo-ohm, then, calculate the values of current gain, input impedance, voltage gain, output admittance, out put impedance and power gain.
- Explain the function of a phase-shift oscillator using three RC sections with necessary diagram. Obtain the expressions for the conditions of oscillation and arrive at its frequency expression.
- Explain the construction, working and output characteristics of a FET.
- Explain the function of a JK master-slave flip-flop with logic diagram and truth-table.
- Explain the function of a 4-bit ripple counter with necessary circuit diagram, truth-table and
waves form.
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