LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

THIRD SEMESTER – NOVEMBER 2010

PH 3504/PH 3502/PH 5501 – ELECTRONICS – I

 

 

 

Date : 30-10-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART  A

Answer  ALL  questions:                                                                                             (10 x 2 = 20 marks)

 

 

1. Define a Constant voltage source.
2. State Maximum Power transfer theorem.
3. What is Zero signal collector current? What is its significance?
4. Define Class A Power amplifier. What is its maximum efficiency?
5. Define CMRR of a differential amplifier. How can it act as a figure of merit of a difference amplifier?
6. Define ‘Inversion Layer’ with reference to MOSFET.
7. What input conditions of a JK flip flop makes it toggle?
8. What is the difference between a Decoder & a Multiplexer?
9. How many flip flops are required to store a decimal no.1001₁₀ in a binary register.
10. Mention any two differences between ROM & RAM.

 

PART  B

Answer  ANY FOUR  questions:                                                                            (4 x 7.5  = 30 marks)

 

11. A constant dc voltage of 10 volts is connected in series with resistances 4Ω & 3Ω. Another load resistance R_L is connected across the 3Ω resistance. Use Norton’s theorem to determine the current through R_L in the circuit.
12. What is the need for biasing the transistor? Explain the Fixed Bias method and the disadvantages faced in this method of biasing.
13. Draw the circuit of i) Summing & ii) Difference Amplifier using Op-Amp and obtain an expression for their output.
14. Draw the logic circuit of a D- Flip Flop and explain its working. How it can be modified to function as a T flip flop?
15. Explain with the circuit the working of a decade counter using JK – flip flops.

 

 

 

 

 

PART  C

Answer  ANY FOUR  questions:                                                                           (4 x 12.5 = 50 marks)

 

16. Describe the analysis of a transistor amplifier in CE mode using ‘h’ parameter and obtain the expression for A_i, A_V and Z
17. Draw Phase Shift oscillator circuit using Transistor and explain its working.
18. Explain the mechanism of current conduction in a SCR. Explain the action of SCR as a half wave rectifier.
19. Using K-map simplify the Boolean function:

F(A,B,C,D) = ∑(0,2,4,5,6,10,12,14). Implement the simplified expression using NAND gates only.

20. Draw a 4-Bit RING counter using JK flip flops and describe the sequence of operations. What is the modulus of the counter?

 

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