Periyar University 2006 B.Sc Electronics COMPONENTS AND CIRCUIT ANALYSIS - exam paper

B.Sc. DEGREE EXAMINATION, OCTOBER/NOVEMBER 2005.
Second Semester
Electronics
COMPONENTS AND CIRCUIT ANALYSIS
Time : 3 hours Maximum : 100 marks
PART A — (10 x two = 20 marks)
ans ALL ques.. All ques. carry equal marks.
1. Define Ohm's legal regulations.
2. Give the effective capacitance when 2 capacitors Cx and C2 are connected in series.
3. State KirchhofTs Voltage legal regulations.
4. State superposition theorem.
5. What is real power?
6. Give the various values of alternating voltage and current.
7. The condition for resonance in a RLC series circuit is

(a) XL=XC
(b) Xc = 2XC
(c) XC=XC2
(d) XL = ^--

8. Define Q factor of parallel resonance circuit.
9. Give 2 advantages of a star connected system.
10. Define time constant of a transient circuit.
PART B — (5 x four = 20 marks)
ans ALL ques..
All ques. carry equal marks.
11. (a) Write a short note on colour coding of
resistor.
Or
(b) 3 capacitors of capacitance of 2fj,F,
4piF and 6}iF respectively are connected in series to a
220 V d.c. supply. obtain the total capacitance.
12. (a) discuss briefly the maximum power transfer
theorem.
Or
(b) State and discuss KirchhofPs current legal regulations.
13. (a) Write a short note on phasor diagram.
Or (b) discuss AC through inductance.
14. (a) discuss about the power triangle.
Or
(b) discuss the bandwidth of series resonance circuit.
15. -<a) Briefly discuss about delta connection.
Or
(b) Write a short note on transient response of RL series circuit.
PART C — (5 x 12 = 60 marks)
ans ALL ques.. All ques. carry equal marks.
16. (a) discuss in detail about the different kinds of
inductors.
Or
(b) 3 resistors four £2, 12 Q, 6Q. are connected in parallel. If the total current taken is 12 A obtain the current through every resistor.
17. (a) discuss in detail about the mesh method.
provide suitable example.
4
Or (b) Using Thevenin's theorem obtain the current in 8Q resistor. provided that battery has an internal resistance of 1Q.
18. (a) A 318 ixF capacitor is connected across a
230V, 50 HZ system. Determine
(i) The capacitive reactance
(ii) r.m.s value of current
(iii) Equations for voltage and current.
Or
(b) Draw the RL series circuit with phasor diagram. find the expression for impedance, power factor, real powder, reactive power for the circuit.
19. (a) Draw the RLC series circuit with phasor
diagram and discuss it in detail.
Or
(b) (i) Write a short note on resonance in RLC series, circuit.
(ii) Write a short note on Q factor of a series circuit
20. (a) discuss the power measurement in three phase circuit using two—wattmeter method.
Or
(b) discuss in detail about the transient response of RLC series circuit has a DC voltage.

Earning:   Approval pending.