EC2204 SIGNALS AND SYSTEMS ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER APRIL/MAY 2010 FOR ECE DEPARTMENT

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010

EC2204 SIGNALS AND SYSTEMS ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER   APRIL/MAY 2010 FOR ECE DEPARTMENT 

Third Semester

Electronics and Communication Engineering

EC2204 — SIGNALS AND SYSTEMS

MOST IMPORTANT QUESTION PAPERS

(Regulation 2008)

Time: Three hours Maximum: 100 Marks

Answer ALL Questions

PART A — (10 × 2 = 20 Marks)

1. Define unit impulse and unit step signals.
2. When is a system said to be memoryless? Give an example.
3. State any two properties of Continuous – Time Fourier Transform.
4. Find the Laplace transform of the signal ) ( ) ( t u e t x at − = .
5. State the convolution integral for continuous time LTI systems.
6. What is the impulse response of two LTI systems connected in parallel?
7. State the Sampling theorem.
8. State the sufficient condition for the existence of DTFT for an aperiodic
sequence ) (n x .
9. Define one sided Z-transform and Two-sided Z-transform.
10. Define the shifting property of the discrete time unit Impulse function.

PART B — (5 × 16 = 80 Marks)

11. (a) Distinguish between the following:
(i) Continuous Time Signal and Discrete Time Signal. (4)
(ii) Unit step and Unit Ramp functions. (4)
(iii) Periodic and Aperiodic signals. (4)
(iv) Deterministic and Random signals. (4)
Or
(b) (i) Find whether the signal ) 1 4 ( sin ) 1 10 ( cos 2 ) ( − − + = t t t x is periodic
or not. (4)
(ii) Find the summation ∑∞
− =
−
8
2 ) 2 (
n
n n e δ . (4)
(iii) Explain the properties of unit impulse function. (4)
(iv) Find the fundamental period T of the continuous time signal




+ =
6
10 cos 20 ) (
π
πt t x . (4)
12. (a) (i) Find the trigonometric Fourier series for the periodic signal ) (t x
shown in the figure given below : (10)
(ii) Explain the Fourier spectrum of a periodic signal ) (t x . (6)
Or
(b) (i) Find the Laplace transform of the signal
) ( ) ( ) ( t u e t u e t x bt t a − + = − − . (8)
(ii) Find the Fourier transform of
t e t x
− = ) ( for 1 1 ≤ ≤ − t
otherwise 0 = . (8)
 132  132  132 
E 3074 3
13. (a) (i) Explain the steps to compute the convolution integral. (8)
(ii) Find the convolution of the following signals: (8)
) ( ) ( 2 t u e t x t − =
) 2 ( ) ( + = t u t h .
Or
(b) (i) Using Laplace transform, find the impulse response of an LTI
system described by the differential equation
) ( ) ( 2
) ( ) (
2
2
t x t y
dt
t dy
t d
t y d = − − . (8)
(ii) Explain the properties of convolution integral. (8)
14. (a) (i) Find the Fourier Transform of
N n
N n A n x
> =
≤ =
0
) (
. (8)
(ii) Explain any four properties of DTFT. (8)
Or
(b) (i) Find the Z-transform of the given signal ) (n x and find ROC.
( ) ( ) sin ( ) o
x n w n u n =     . (10)
(ii) Describe the sampling operation and explain how aliasing error can
be prevented. (6)
15. (a) (i) Find the impulse response of the discrete time system described by
the difference equation
) 1 ( ) ( 2 ) 1 ( 3 ) 2 ( − = + − − − n x n y n y n y . (8)
(ii) Discuss the block diagram representation for LTI discrete time
systems. (8)
Or
(b) (i) Describe the state variable model for discrete time systems. (8)
(ii) Find the state variable matrices A, B, C, D for the equation
) 2 ( 6 ) 1 ( 5 ) ( ) 2 ( 2 ) 1 ( 3 ) ( − + − + = − − − − n x n x n x n y n y n y . (8)

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DIGITAL ELECTRONICS Electronics Question Papers and question papers huge collection with solutions download

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009.

Third Semester

 DIGITAL ELECTRONICS Electronics Question Papers and question papers huge collection with solutions download

Electronics and Communication Engineering

EC 2203 — DIGITAL ELECTRONICS

(Regulation 2008)

Time : Three hours Maximum : 100 Marks

Answer ALL Questions

PART A — (10 × 2 = 20 Marks)

1. Prove that the logical sum of all minterms of a Boolean function of 2 variables is 1.

2. Show that a positive logic NAND gate is a negative logic NOR gate.

3. Suggest a solution to overcome the limitation on the speed of an adder.

4. Differentiate a decoder from a demultiplexer.

5. Write down the characteristic equation for JK flipflop.

6. Distinguish between synchronous and asynchronous sequential circuits.

7. Compare and contrast static RAM and dynamic RAM.

8. What is PAL? How does it differ from PLA?

9. What are Hazards?

10. Compare the ASM chart with a conventional flow chart.

PART B — (5 × 16 = 80 Marks)

11. (a) (i) Express the Boolean function Z X XY F + = in product of Maxterm.

(6)

(ii) Reduce the following function using K-map technique

( ) ( ) ( ) 6 , 2 14 , 12 , 10 , 8 , 7 , 4 , 3 , 0 , , , d D C B A f + = π . (10)

Or

(b) Simplify the following Boolean function by using Quine-Mcclusky method

( ) ( ) ∑ = 13 , 12 , 10 , 8 , 7 , 6 , 3 , 2 , 0 , , , D C B A F . (16)

12. (a) Design a carry look ahead adder with necessary diagrams. (16)

Or

(b) (i) Implement full subtractor using demultiplexer. (10)

(ii) Implement the given Boolean function using 8 : 1 multiplexer

( ) ( ) ∑ = 6 , 5 , 3 , 1 , , C B A F . (6)

13. (a) (i) How will you convert a D flipflop into JK flipflop? (8)

(ii) Explain the operation of a JK master slave flipflop. (8)

Or

(b) Explain in detail the operation of a 4 bit binary ripple counter. (16)

14. (a) Implement the following Boolean functions with a PLA

( ) ( ) ∑ = 4 , 2 , 1 , 0 , , 1 C B A F

( ) ( ) ∑ = 7 , 6 , 5 , 0 , , 2 C B A F

( ) ( ) ∑ = 7 , 5 , 3 , 0 , , 3 C B A F . (16)

Or

(b) Design a combinational circuit using a ROM. The circuit accepts a three

bit number and outputs a binary number equal to the square of the input

number. (16)

15. (a) Design a three bit binary counter using T flipflops. (16)

Or

(b) Design a negative-edge triggered ‘T flipflop’. (16)

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MEASUREMENTS AND INSTRUMENTATION important modal question papers Anna university

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009

 MEASUREMENTS AND INSTRUMENTATION important modal question papers Anna university 

Third Semester

Electricaland Electronics Engineering

EE2201 — MEASUREMENTS AND INSTRUMENTATION

(Regulation 2008)

Time : Three hours Maximum : 100 Marks

Answer ALL Questions

PART A — (10 × 2 = 20 Marks)

1. Differentiate Resolution from Threshold.
2. How are the absolute and relative errors expressed mathematically?
3. What are the essential torques required for operating an instrument?
4. What is phase meter? Mention the types of phase meter.
5. What is an isolation amplifier? Where is it used?
6. State the condition for balance in a Wheatstone bridge.
7. What are the types of printers according to printing methodology?
8. What are the main parts of the cathode ray tube?
9. Differentiate sensor from transducer.
10. Draw the block diagram for 4 bit Analog to Digital Converter.

PART B — (5 × 16 = 80 Marks)

11. (a) Define and explain the static characteristics of an instrument.
Or
(b) (i) Draw and explain the general block diagram of measurement
system.
(ii) Write a note on different types of errors.
12. (a) Describe the construction and working principle of single phase
induction type energy meter. Write a short note on any two adjustments
required in energy meters.
Or
(b) Explain with neat sketch the classification of Instrument Transformers.
Write a note on the errors affecting the characteristics of an Instrument
Transformer.
13. (a) With a neat sketch describe a bridge to determine the unknown
inductance and a bridge to determine the unknown capacitance.
Or
(b) Explain the grounding techniques in detail to reduce the ground loop
interference signal.
14. (a) Describe the LED and LCD display devices.
Or
(b) Describe the direct and frequency modulation magnetic tape recording
types. Give its merits and demerits.
15. (a) What are the selection criteria for the transducer? Explain the working
principle of LVDT with neat sketch and characteristics. Give
advantages, disadvantages and applications of LVDT.
Or
(b) What are the performance parameters of Analog to Digital Converter?
Explain any two basic A/D conversion techniques in detail.

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EE2254 — LINEAR INTEGRATED CIRCUITS AND APPLICATIONS question papers with solution four years huge collection

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010

Fourth Semester

Electrical and Electronics Engineering

EE2254 — LINEAR INTEGRATED CIRCUITS AND APPLICATIONS previous year collections

(Regulation 2008)

(Common to Instrumentation and Control Engineering and Electronics and

Instrumentation Engineering)

Time: Three hours Maximum: 100 Marks

Answer ALL Questions

PART A — (10 × 2 = 20 Marks)

1. What is the purpose of oxidation process in IC fabrication?

2. What is parasitic capacitance?

3. List any four characteristics of an ideal OP-Amp.

4. Design an amplifier with a gain of –10 and input resistance of 10 k .

5. Define slew rate and state its significance.

6. An 8 bit DAC has a resolution of 20mV/bit. What is the analog output voltage

for the digital input code 00010110 (the MSB is the left most bit)?

7. Draw the pin diagram of IC 555 timer.

8. Mention any two application of multiplier IC.

9. List the important parts of regulated power supply.

10. What are the advantages of switch mode power supplies?

PART B — (5 × 16 = 80 Marks)

11. (a) Explain the basic processes used in silicon planar technology with neat

diagram.

Or

(b) Discuss the various methods used for fabricating IC resistors and

compare their performance.

12. (a) (i) Explain the functions of all the basic building blocks of an Op-Amp.

(8)

(ii) Explain the application of OPAMP as (1) integrator

(2) differentiator. (8)

Or

(b) Find 0V of the following circuit.

13. (a) Design and explain triangular wave generator using Schmitt trigger and

integrator circuit.

Or

(b) (i) Explain the operation of dual slope ADC. (8)

(ii) Explain the following characteristics of ADC resolution, accuracy,

settling time, linearity. (8)

14. (a) With neat block diagram, explain IC566 VCO operation and discuss any

two applications.

Or

(b) What are the modes of operation of IC555? Derive the expression of time

delay of a monostable multivibrator.

15. (a) With a neat diagram, explain working principle of switch mode lower

supply.

Or

(b) Write brief notes on:

(i) IC MA 78 40

(ii) Optocoupler.

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LATEST ELECTRICAL ENGINEERING QUESTION PAPERS/BANKS HUGE COLLECTIONS WITH FREE DOWNLOAD ANSWER KEY

B.E./B.Tech. DEGREE EXAMINATION, 

NOVEMBER/DECEMBER 2009

Third Semester

Electronics and Communication Engineering

EC 2201 — ELECTRICAL ENGINEERING

(Regulation 2008)

MOST NEEDED QUESTION PAPERS

Time : Three hours Maximum : 100 Marks

Answer ALL Questions 

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PART A — (10 × 2 = 20 Marks)

1. What are the functions of yoke in a D.C. machine?
2. List the methods of speed control of a D.C. shunt motor.
3. Write down the emf equations of a single phase transformer.
4. Give the expression for percentage voltage regulation of a single phase
transformer.
5. Define the slip of a three phase induction motor.
6. List the types of starters used to start three phase induction motors.
7. What are the two types of synchronous machines?
8. Give the applications of stepper motors.
9. Why are high voltages preferred for the transmission of electrical power?
10. List the components in a substation.

PART B — (5 × 16 = 80 Marks)

11. (a) (i) With a neat sketch explain the constructional details of a D.C.
machine. (12)
(ii) Draw and explain the internal and external characteristics of a
D.C. shunt generator. (4)
Or
(b) (i) Derive the torque equation of a D.C. motor. (6)
(ii) With a neat sketch explain the operation of a three point starter for
a D.C. motor. (10)
12. (a) Explain the principle of operation of a single phase transformer and its
behaviour on loaded condition with phasor diagram. (16)
Or
(b) (i) Develop the equivalent circuit of a transformer. (8)
(ii) Explain the O.C. and S.C. tests done on a single phase transformer.
(8)
13. (a) (i) With neat sketches explain the construction of three phase slip ring
and squirrel cage induction motors. (10)
(ii) Compare the slip ring and squirrel cage rotors. (6)
Or
(b) (i) Explain the auto transformer and star delta starters used to start
the three phase induction motors. (8)
(ii) Explain the principle of operation of a shaded pole single phase
induction motor. (8)
14. (a) (i) Derive the expression for the induced emf of a synchronous
generator. (8)
(ii) Explain the construction and operation of a reluctance motor. (8)
Or
(b) (i) Explain the method of obtaining the voltage regulation of a
synchronous generator using EMF method. (10)
(ii) Explain the construction and operation of a hysterisis motor. (6)
15. (a) (i) Explain the structure of a electrical power system indicating the
generation, transmission and distribution section. (10)
(ii) Draw and explain the layout of a single bus bar substation. (6)
Or
(b) (i) Discuss the advantages and disadvantages of EHVAC and EHVDC
systems. (10)
(ii) Explain the construction of any one type of cables used for EHV
systems. (6)

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UNIT – I

PART – A

1. Define electric motor.
2. Define electric generator.
3. Define excitation.
4. What are the methods of excitation?
5. What do you mean by self excited machine?
6. What do you mean by separately excited machine?
7. State the function of commutator.
8. What do you mean by commutation?
9. What is the purpose of brushes?
10. By which material yoke can be manufactured?
11. Why the brushes are made upon carbon?
12. What are the types of self excited generator?
13. Define shunt generator.
14. Define series generator.
15. Define compound generator.
16. Draw the open circuit characteristics of dc separately excited generator.
17. What do you mean by magnetization curve?
18. Draw the load characteristics of separately excited dc generator.
19. Draw the characteristics for DC shunt generator.
20. Draw the characteristics of DC series generator.
21. Draw the characteristics of DC compound generator.
22. What is the principle of operation of dc generator?
23. Write down faradey's law of electromagnetic induction.
24. What is the principle of operation of DC motor?
25. State lenz's law.
26. How Lenz's law is helpful for the operation of DC motor?
27. Write the significance of back e.m.f.
28. Define back e.m.f.
29. Write the e.m.f. equation of DC generator.
30. Write down the voltage equation of DC motor.
31. Write the torque equation of DC motor.
32. Draw the characteristics of DC shunt motor.
33. Draw the characteristics of DC series motor.
34. Draw the characteristics of DC compound motor.
35. Differentiate differentially compound and cumulatively compound motor.
36. What are the applications of DC shunt motor?
37. What are the applications of DC series motor?
38. What are the applications of DC compound motor?
39. Why shunt motor is called as constant speed machine?
40. Why starter is needed in DC motor?
41. What is the advantage of 4 point starter over 3 point starter?
42. State the function of no volt coil.
43. State the function of over load release.
44. What is the advantage of conducting Swin-burne's test?
45. Draw the diagram of ward-leanord system of speed control.
46. By which method, we can control the speed of the motor below the base speed?
47. By which method, the speed control of the DC motor be above the base speed?
48. What are the various methods of speed control of DC motor?
49. Differentiate armature voltage control method and field flux control method.
50. What do you mean by brake test?

PART – B

51. Explain in detail the constructional details of DC machine.
52. Derive the e.m.f. equation (8)
53. Draw and explain the characteristics of DC generator.
54. Derive the torque equation/
55. Write down the significance of back e.m.f.
56. Write down the principle of operation of DC motor.
57. Draw and explain the characteristics of DC motor.
58. Draw and explain 3 point starter.
59. What is the draw back in 3 point starter and how it is overcome in 4 point starter?
60. Explains the procedure of swin burne's test.
61. Draw and explain the speed control methods of DC shunt motor.
62. Explain in detail about the ward-leonard system of speed control of DC motor.
63. Problem.

UNIT – II

PART – A 

1. State the principle of operation of transformer.
2. What are the types of transformer according to its construction?
3. Differentiate core type transformer and shell type transformer.
4. Write down the e.m.f equation of transformer.
5. Write down the transformation ratio.
6. Define magneting current component.
7. Define working current component.
8. Draw the vector diagram of transformer an no load.
9. How the resistance of the secondary be referred in the primary?
10. Draw the approximate equivalent circuit of the transformer.
11. Draw the vector diagram for the transformer under resistive load.
12. Draw the vector diagram for the transformer under inductive load.
13. Draw the vector diagram of the transformer under comparative load.
14. When the transformer is said to be ideal?
15. Define voltage regulation of transformer.
16. Define voltage regulation up.
17. Define voltage regulation down.
18. By conducting no load test, which losses can be found out?
19. Which losses can be found out by conducting short circuit test?
20. What are the tests to be conducted on the transformer?

PART - B

1. Derive the e.m.f. equation of transformer.
2. Explain in detail about the transformer on no load.
3. Draw and explain ideal transformer. Draw its vector diagram.
4. Obtain the equivalent circuit of the transformer by conducting suitable tests.
5. Draw and explain in detail about the transformer an load.
6. Derive the regulation formula for the transformer.
7. Explain in detail about the testing procedures for the transformer.
8. Problem.

UNIT – III

PART – A 

1. Write the working principle of induction motor.
2. How RMF is produced with the help of 3 phase supply?
3. Define slip.
4. Write the working principle of 3f induction motor.
5. Why 3f induction motor is called as rotating transformer?
6. Can the rotor speed of induction motor be synchronous speed?
7. What are the types of induction motor?
8. Write down the torque equation of 3f induction motor.
9. Draw the slip-torque characteristics.
10. Draw the speed-torque characteristics.
11. State the relation between P₂, P_c and P_m.
12. Draw the Power flow diagram of 3 phase induction motor.
13. Draw the equivalent circuit of 3 f induction motor.
14. Why starter is necessary in AC induction motor?    
15. What are the types of starters available to start 3 f induction motor?
16. Why single phase induction motor is not self starting?
17. How single phase induction motor is made to start?
18. How the rotor is classified in 3f induction motor?
19. How Rmf is produced in the stator of the induction motor
20. What is Rmf?

PART - B

1. Explain the constructional details of 3 f induction motor.

2. How Rmf is produced with the help of 3 f AC supply?

3. Explain in detail the principle of operations of 3 phase induction motor.

4. Explain the procedure to obtain the equivalent circuit of 3 phase induction motor.

5. Derive the torque equation of 3 phase induction motor.

6. Draw and explain the characteristics of 3 phase induction motor.

7. Explain in detail about (i) Star-delta starter (ii) Auto transformer starter (iii) DOL starter.

8. Write short notes on single phase transformer.

9. Why single phase induction motor is not self starting? Explain the methods available to start the motor.

10. Write short notes on speed control of 3 f induction motor.

UNIT IV

PART – A 

1. What are the types of synchronous machines?
2. What is the basic principle of operation 3f alternator?
3. Why stationary armature is there in 3f alternator?
4. Write down the e.m.f. equation of alternator.
5. What are the types of 3 f alternator?
6. Define voltage regulation of alternator?
7. What are the methods to find out voltage regulation?
8. Why synchronous impedance methods is called as pessimistic method?
9. What are the methods to find out voltage regulation
10. Why synchronous impedance method is called as pessimistic method?
11. Define synchronous impedance.
12. Why ampere-turns method is called as optimistic method?
13. Draw the phasor diagram for voltage regulation in synchronous impedance method.
14. How emf is induced in brushless alternator?
15. What is the function of rotating diode assembly in brush can alternator?
16. What do you mean by brushless excitation?
17. How reluctance motor is running?
18. What is the operating principle of hysteresis motor?
19. What are the types of stepper motor?
20. How do you find step angle in stepper motor?
21. Give the application of stepper motor.

PART - B

22. Derive the emf equation of alternator.
23. Write down the procedure of finding voltage regulation of alternator using synchronous impedance method.
24. Write down the procedure for finding voltage regulation using ampere-turns method.
25. Explain in detail the construction of synchronous machine.
26. Write short notes on (i) Brushless alternator (ii) Reluctance motor (iii) Hysteresis motor (iv) Stepper motor.

UNIT – V

PART – A

1. What are the various sources of electric power generating system?
2. What is the purpose of step up transformer in electrical power system?
3. What do you mean by carona loss?
4. What is meant by Ferranti effect?
5. What are the advantages of AC transmission?
6. What are the advantages of DC transmission?
7. What are the types of distribution system?
8. What is EHUAC?
9. Define EHUDC.
10. What is the purpose of circuit breakers.
11. Define insulators.
12. Why the transmission is done through under ground cable?
13. What are the advantages of under ground cables?
14. What are the types of under ground cables?
15. What are types of insulators?
16. What is pin insulator? Where it is used?
17. What is stay insulator? Where it is used?
18. What are the purposes of insulator?
19. Define service mains.
20. Define grid.
21. Differentiate feeders and distributors.

PART - B

1. Explain in detail, the single line diagram of electrical power system.
2. Explain in detail the various types of transmission and distribution systems.
3. Distinguish EHUAC and EHUDC systems.
4. Explain in detail the substation lay out.
5. Write short notes as (i) Insulators (ii) cables.

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