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CHEMISTRY

B.E./B.Tech. DEGREE EXAMINATION, MAY / JUNE 2006

SECOND SEMESTER

ELECTRICAL AND ELECTRONICS ENGINEERING

CY 1151 – CHEMISTRY – II

(COMMON TO ELECTRONICS AND INSTRUMENTATION ENGINEERING AND INSTRUMENTATION AND CONTROL ENGINEERING)

REGULATION 2004

TIME: THREE HOURS MAXIMUM: 100 MARKS

ANSWER ALL QUESTIONS

PART A – [10 X 2 = 20 MARKS]

1) Why aluminium is passive towards corrosion in oxidation environment?
2) What is pitting corrosion?
3) What are ABS polymers? Give their uses.
4) Mention the properties and uses of PVC.
5) What is a photosensitized reaction? Give one example.
6) What is a chemical actinometer?
7) What is a primary battery? Give an example.
8) Mention any two differences of a nuclear reaction and a chemical reaction.
9) Mention the ore and its composition used in the production of aluminium by Bawyer’s process.
10) What is the principle in voltammetry?

PART B – [5 X 16 = 80 MAR4KS]

11) Write a brief notes on (i) electrochemical machining (ii) Electro refining of copper. [8 X 2 = 16 MARKS]

12) (a) (i) Define quantum yield. Explain the causes of high and low quantum yield with suitable examples. [10 MARKS]
(ii) When a substance A was exposed to light, 0.002 mole of it reacted in 20 minutes and 4 seconds. In the same time A absorbed 2.0 X 106 photons of light per second. Calculate the quantum yield of the reaction. [6 MARKS]

OR

(b) (i) Define and explain the two basic laws of photochemical reactions. [7 MARKS]
(ii) Explain briefly the term fluorescence, phosphorescence and chemiluminescence. [9 MARKS]

13) (a) (i) Write ht e principles, structures and characteristics of optical fibre. [8 MARKS]
(ii) Write a brief note on fibre reinforced plastics. [8 MARKS]

OR

(b) (i) What are conducting polymers? Discuss their electronic behaviou on the basis of chemical structure. [8 MARKS]
(ii) Discuss the preparation, properties and uses of bakelite. [8 MARKS]

14) (a) (i) Discuss how the nature of the metal influence the rate of corrosion. [8 MARKS]
(ii) Explain the process of electroplating with a suitable examples. Mention the uses of electroplating. [8 MARKS]

OR

(b) (i) Explain the electrochemical theory of corrosion with suitable example. [8 MARKS]
(ii) Write a brief note on :
                  (1) cathodic protection by sacrificial anode [4 MARKS]
                  (2) Differential aeratin corrosion. [4 MARKS]

15) (a) (i) What is a nuclear reactor? Describe the components of a light-water nuclear power plant with a suitable block diagram. [10 MARKS]
(ii) Write a note on Ni-Cd battery. [6 MARKS]

OR

(b) (i) Write a brief note on:
                                (1) Lead – acid storage cell
                                (2) Hydrogen – oxygen fuel cell. [5+5 = 10MARKS]
(ii) Define mass defect and nuclear binding energy. How are they related. [6 MARKS]

BIOMEDICAL INSTRUMENTATION

B.E. / B.Tech. DEGREE EXAMINATION, APRIL / MAY 2008

Seventh Semester

Electrical and Electronics Engineering

EI 1351 – BIOMEDICAL INSTRUMENTATION

(Regulation 2004)

Time : Three Hours                                                           Maximum : 100 Marks

Answer All Questions

PART A – [10 X 2 = 20 MARKS]

1. What is the usual conduction velocity range in nerves?
2. Name any two passive transducers.
3. What is an ERG?
4. What is the need for pre amplifier?
5. What is need for earthing of medical instruments?
6. What is the use of plethysmography?
7. Distinguish Microshock and Macroshock.
8. What is the need for image intensifier in an x-ray machine?
9. What is a defibrillator?
10. Name the two types of dialysis.

PART B – [5 X 16 = 80 MARKS]

11. (a) (i) With relevant waveforms explain Action and resting potential. [8 MARKS]
(ii) Explain any one piezoelectric and inductive transducer used in medical application. [8 MARKS]

OR

(b) (i) With block diagram explain cardiovascular circulation. [8 MARKS]
(ii) What is the principle of ultrasonic transducer? Explain any one ultrasonic transducer based instrumentation. [8 MARKS]

12. (a) (i) With relevant equivalent circuit explain the measurement of biopotentials with two electrodes. [8 MARKS]
(ii) Explain in detail EECG lead configurations. [8 MARKS]

OR

(b) (i) With neat diagram explain the principle of Isolation amplifier. What is its use in medical instruments? [8 MARKS]
(ii) Draw and explain typical EEG waveforms. [8 MARKS]

13. (a) (i) Explain any one direct blood pressure measurement method. [8 MARKS]
(ii) Explain how cardiac output can be measured. [8 MARKS]

OR

(b) (i) Explain the method of measuring CO2 and O2 in exhaust air. [8 MARKS]
(ii) Explain how PH of blood can be measured. [8 MARKS]

14. (a) With neat diagram explain the principle of MRI. [16 MARKS]

OR

(b) (i) Distinguish radiographic and fluoroscopic techniques. [8 MARKS]
(ii) Explain the applications of Telemetry in patient care. [8 MARKS]

15. (a) Explain in detail the various types of cardiac pacemakers. [16 MARKS]

OR

(b) (i) Briefly explain three different modes of operation of ventilators. [8 MARKS]
(ii) Draw the block diagram of Nerve and muscle stimulator. Explain. [8 MARKS]

APPLIED THERMODYNAMICS

B.E./B.Tech. DEGREE EXAMINATION, MAY / JUNE 2006

THIRD SEMESTER

ELECTRICAL AND ELECTRONICS ENGINEERING

ME 1211 – APPLIED THERMODYNAMICS

REGULATION 2004

TIME: THREE HOURS                                             MAXIMUM: 100 MARKS

ANSWER ALL QUESTIONS

(use of approved thermodynamic charts and tables are permitted)

PART A – [10 X 2 = 20 MARKS]

1) Define path function and point function.
2) State Kelvin plank’s second law of thermodynamics.
3) What is normal and abnormal combustion?
4) What do you understand by open and closed cycle gas turbine?
5) Define wet steam and dryness fraction of steam.
6) List down the advantages of compounding steam turbines.
7) What is the need for an intercooler in a multistage air compressor?
8) Define ton of refrigeration.
9) State Fourier’s law of heat conduction and give its expression.
10) What do you understand by natural convection and forced convection?

PART B – [16 X 5 = 80 MARKS]

11) (i) Give the steady state flow energy equation and explain the various terms. [6 MARKS]
(ii) Explain carnot cycle with a neat sketch and a p-v diagram. [10 MARKS]

12) (a) (i) Sketch the p-V diagrams of otto, diesel and dual cycles and name the various processes. [9 MARKS]
(ii) Explain the principle of operation of a two strke cycle spark ignition engine with a neat sketch. [7 MARKS]

OR

(b) (i) With a neat sketch describe the working principle of a four strke cycle compression ignition engine. [8 MARKS]
(ii) Draw a neat sketch of a brayton cycle on p-V and T-s diagrams indicating the reheating, intercooling and regeneration processes. [8 MARKS]

13) (a) (i) Mention the function of superheater, reheater, economizer, pressure gauge, safety valve and air preheater. [6 MARKS]
(ii) Draw the T-s diagram and schematic of rankine cycle and explain the various processes.

OR

(b) (i) Mention the principle of operation of an impulse and a reaction turbine. [4 MARKS]
(ii) Draw the layout of a steam power plant and explain its principle of operation. [12 MARKS]

14) (a) With neat sketches explain the principle of operation of centrifugal and axial flow compressors. [16 MARKS]

OR

(b)(i) Explain the vapour compression cycle with the help of T-s diagram. [12 MARKS]
(ii) Define wet bulb temperature, specific humidity, humidification and dehumidification. [4 MARKS]

15) (a)(i) Explain conduction, convection and radiation heat transfer with examples. [8 MARKS]
(ii) Obtain an expression for heat conduction through a cylinder with a neat sketch. [8 MARKS]

OR

(b)(i) What do you understand by black body and grey body? Explain [6 MARKS]
(ii) Discuss the methods of liquid cooling and immersion cooling of electronic chips. [10 MARKS]

PRINCIPLES OF ENVIRONMENTAL SCIENCE AND ENGINEERING

B.E./B.Tech. DEGREE EXAMINATION, MAY / JUNE 2006

SEVENTH SEMESTER

(COMMON TO ALL BRANCHES)

CE 071 – PRINCIPLES OF ENVIRONMENTAL SCIENCE AND ENGINEERING

TIME: THREE HOURS                                             MAXIMUM: 100 MARKS

ANSWER ALL QUESTIONS

PART A – [10 X 2 = 20 MARKS]

1) Define ecosystem.
2) What do you mean by ecological pyramid?
3) State the components of the lithosphere and the characteristics of crust.
4) Enumerate the reactions in the process of chemical weathering of natural rocks to form matured soil.
5) Draw the flow chart showing the functional elements of solid waste management.
6) Mention any four compounds that are responsible for ozone layers depletion.
7) Name any four states having botanical hot spots in India.
8) Distinguish between insitu and exsitu conservation.
9) State any four goals of waste audit.
10) State the precautionary principle as per Rio Declaration.

PART B – [5 X 16 =80 MARKS]

11) (i) Describe the various components of Ecosystem structure. [8 MARKS]

       (ii) Describe the energy flow in ecosystem and the factors controlling it.
                                                                                                 [8 MARKS]

12) (a) (i) Describe about the composition in different layers of atmospheres. 
                                                                                                        [12 MARKS]
(ii) What do you mean by lapse rate and temperature inversion. [4 MARKS]

OR

(b) Desribe any four environmental stress on environmental components.
                                                                                             [16 MARKS]


13) (a) Describe the unit processes involved in the treatment of municipal
             water.[16 MARKS]

OR

          (b) Draw a flow sheet and explain the process of municipal waste water
                treatment by activated sludge process. [16 MARKS]


14) (a) Describe the steps involved in EIA with the help of a flow sheet.
                                                                                                [16 MARKS]

OR

     (b) (i) Write a note on Polluters pay principle. [6 MARKS]

         (ii) Enumerate the role of Non Governmental Organisation and explain
              the importance of community participation in environmental
               management.                                           [10 MARKS]


15) (a) Explain the various functions of pollution control boards, in detail.
                                                                                                 [16  MARKS]

OR

        (b) (i) Describe about the constitutional provisions for environmental
                   management in India. [8 MARKS]
             (ii) Describe any foru pollution control acts in India. [8 MARKS]

PHYSICS

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2007

Second Semester

Mechanical Engineering

PH 138 – PHYSICS - II

(Common to Aeronautical Engineering, Automobile Engineering, Mechatronics Engineering and Production Engineering)

Time: Three hours                                                              Maximum: 100 Marks

Answer ALL questions.

PART A – [10 X 2 = 20 MARKS]

1. Find the interplanar distance for (211) planes of a crystal with FCC structure and lattice parameter of 4.05A.

2. What is “Burger’s vector?

3. Define ‘hardness’ of a material.

4. What are the degrees of freedom of a system of two components when there exists a single phase?

5. What are ‘cermet’?

6. Write a note on FRP.

7. What are compound semiconductors?

8. What are ‘ferrites’?

9. Outline the magnetic particle method of NDT.

10. List two merits and two demerits of gamma ray radiography.

PART B – [5 X 16 = 80 MARKS]

11. (a) (i) Distinguish between different crystal systems in terms of lattice
                 parameters. [6 MARKS]

           (ii) How Miller indices of lattice planes obtained? [6 MARKS]

          (iii) What are Bravais lattices? [4 MARKS]

OR

      (b) (i) Deduce the packing factor of FCC crystals. [6 MARKS]

           (ii) Briefly discuss on various crystal imperfections. [10 MARKS]


12. (a) Explain the different stages of rupture in materials due to
                             i. fatigue and
                            ii. creep [6 + 10 MARKS]

OR

(b) Describe the Iron-Carbon phase diagram in detail. [16 MARKS]


13. (a) Describe the mechanical, electrical, chemical and thermal properties of
            ceramic materials. [5+5+3+3 MARKS]

OR

      (b) Discuss the method of preparation, properties and applications of
                        i. Glass ceramics and
                       ii. Composites. [8 + 8 MARKS]


14. (a) Explain the different types of magnetic materials in terms of spin
            alignment and susceptibility. [16 MARKS]

OR

(b) Describe the principle and working of
                                           i. LCD and
                                          ii. Photo conducting devices. [10 + 6 MARKS]


15. (a) Enumerate the steps involved in the liquid penetrant method of NDT
            and explain them in detail. [16 MARKS]

OR

      (b) (i) With necessary diagram, discuss the ultrasonic method of NDT.
                                                                                        [10 MARKS]

           (ii) Outline the thermographic method of NDT. [6 MARKS]

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COMPUTER PROGRAMMING

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2007

Annual Pattern – First Year

Civil Engineering

GE1X02 – COMPUTER PROGRAMMING

(Common to All Branches of B.E./B.Tech.)

(Regulation 2004)

Time: Three hours Maximum: 100 Marks

Answer ALL questions.

PART A – [10 X 2 = 20 MARKS]

1. What are the different types of software?

2. What is meant by debugging?

3. List the rules that are to be followed while declaring variables.

4. With an example, state the purpose of break and continue statement.

5. What is recursion? Write a recursive procedure to evaluate factorial of N.

6. List and discuss the various string operations.

7. State the advantages of using pointers.

8. Compare structures with union.

9. What are the different types of linked list? State all the basic linked list operations.

10. State any two applications of stacks and queues.

PART B – [5 X 16 = 80 MARKS]

11. (a) (i) Draw and explain the block diagram of a computer. [10 MARKS]

      (ii) Write notes on:
                     a. High level language and low level languages. [3 MARKS]
                     b. Internet Services [3 MARKS]

OR

(b) (i) Explain in detail the various stages involved in developing a program. [10 MARKS]

      (ii) What are the essential properties of an algorithm? Develop an
             algorithm to generate Fibonacci series upto 100. [6 MARKS]


12. (a) (i) Explain the various input and output functions supported by C
                 languages. [10 MARKS]

             (ii) State and explain the various data types supported by C language.
                                                                                              [6 MARKS]

OR

(b) (i) With an example, explain switch statement. [8 MARKS]

     (ii) State the difference between Entry controlled loop and Exit controlled
           loop. [8 MARKS]


13. (a) (i) Write notes on:
                       1. Actual and formal parameters [6 MARKS]
                       2. Various storage classes supported by C language. [6 MARKS]

              (ii) What is the need for declaring function prototype? [4 MARKS]

OR

(b) (i) Write a C program to get a matrix as input and perform the following
           operations.
                                a. Add all the diagonal elements.
                                b. Find the transpose of a given matrix.


       (ii) Write a C program to get an array of N inputs and perform the search
             operation. Print the number of occurrences of a given element with
             their position. [6 MARKS]



14. (a) Write a C program to perform string operations using pointers.
                   i. Find the length of a given string. [4 MARKS]
                   ii. String copy [6 MARKS]
                   iii. String concatenate. [6 MARKS]

OR

         (b) Explain the various file handling functions with suitable example.
                                                                          [16 MARKS]


15. (a) Write a C program to implement following singly list operation.
             i. To print number of occurrences of a particular element. [8 MARKS]
             ii. Concatenation of two linked list. [8 MARKS]

OR

       (b) Write a C program to implement Push and Pop operation on linked list.
                                                                        [16 MARKS]

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ELECTRICAL ENGINEERING

B.E./B.Tech. DEGREE EXAMINATION, MAY / JUNE 2006

THIRD SEMESTER

ELECTRONICS AND COMMUNICATION ENGINEERING

EE 253 – ELECTRICAL ENGINEERING

TIME: THREE HOURS                                             MAXIMUM: 100 MARKS

ANSWER ALL QUESTIONS

PART A – [10 X 2 = 20 MARKS]

1) How the instantaneous power in a balanced three phase circuit is a constant?

2) What is transformer all day efficiency?

3) Define the term back emf in DC motor.

4) Draw the torque – speed characteristics of DC motor.

5) What is importance of slip in electrical motors?

6) What are the basic requirements for starting of induction motor?

7) For a 50 Hz generator list four possible combinations of the number of poles and the speed?

8) Define voltage regulation of a synchronous generator at a given load.

9) What is the function of circuit breaker in power system?

10) Name any three ways of electric power generation.

PART B – [5 X 16 = 80 MARKS]

11) (i) A three phase balanced load has 10Ω resistance in each of its phases. The load is supplied by a 220V 3phase source. Calculate the power absorbed by the load if it is connected in wye; calculate the same if it is connected in delta connection. [8 MARKS]

(ii) a 220V/110V,10kVA transformer has a primary widning resistance of 0.25Ω and a secondary winding resistance of 0.06Ω. determine the primary and secondary currents at rated load, the total winding resistance referred to the primary, and the total winding resistance referred to the secondary. [8 MARKS]


12) (a) (i) Derive the torque equation of DC motor from first principle. [8 MRAKS]

(ii) Classify DC machine according to forms of excitation and draw its circuit diagram. [8 MARKS]

OR

(b) (i) A 230V, 10HP shunt motor takes a full load line current of 40A. The armature and field resistances are 0.25Ω and 230Ω respectively. The total brush contact drop is 2V, and the core and friction losses are 380W. Calculate the efficiency of the motor. Assume that the stray load loss is 1% of the rated output. [11 MARKS]

(ii) Write short notes on starting of DC motor. [5 MARKS]


13) (a)(i) A six pole three phase 60Hz induction motor runs at 4% slip at a certain load. Determine the synchronous speed, rotor speed, frequency of the rotor currents, speed of the rotor rotating field with respect tot the stator, and speed of the rotor rotating field with respect to the stator magnetic field. [12 MARKS]

(ii) List out the similarities between a transformer and an induction motor in developing an equivalent circuit. [4 MARKS]

OR

(b)(i) An induction motor is designed to run at 5% slip on full load. If the motor draws 6 times the full load current at starting at the rated voltage, estimate the ratio of the starting torque to the full load torque. [8 MARKS]

(ii) Explain various methods of starting of three phase induction motor. [8 MARKS]


14) (a)(i) Calculate the percentage voltage regulation for a three phase wye connected 2500kVA, 6600V alternator operating at full load and 0.8 power factor lagging. The per phase synchronous reactance is 10.4Ω. Neglect armature resistance. [8 MARKS]

(ii) Explain the constructional details of synchronous machine. [8 MARKS]

OR

(b) Explain the constructional details, principle of operation and applications of the following special machines:

                                  (i) Stepper motor [8 MARKS]

                                  (ii) Reluctance motor [8 MARKS]


15) (a)(i) Briefly explain the principle divisions in power system. [8 MARKS]

(ii) List out the important substation equipment and their function. [8 MARKS]

OR

(b) Write short notes on:

                         (i) Underground cable distribution. [8 MARKS]

                         (ii) EHVDC transmission [8 MARKS]

EE 151 – ELECTRICAL ENGINEERING

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2007

Second Semester

Civil Engineering

EE 151 – ELECTRICAL ENGINEERING

(Common to b.e. Mechanical Engineering/Metallurgical Engineering/Chemical Engineering/Industrial Biotechnology/Leather Technology/Polymer Technology/Textile Chemistry/Textile Technology/Fashion Technology and Mechatronics Engineering)

Time: Three hours Maximum: 100 Marks

Answer ALL questions.

PART A – [10 X 2 = 20 MARKS]

1. State Kirchoff’s Law.

2. Define RMS value of an a.c. signal.

3. Draw a power triangle indicating power components.

4. List the different types of d.c. machines.

5. Why transformer rating is given in KVA?

6. Mention the different methods of starting of induction motors.

7. What are the different types of damping provided in a measuring instrument?

8. Why electrodynamometer types of instruments are used as transfer instruments?

9. Why moving coil instrument has an uniform scale?

10. Why a single phase motor is not a self starting machine?

PART B – [ 5 X16 = 80 MARKS]

11. (a) A circuit consists of three resistors 3 ohms, 4 ohms, and 6 ohms in parallel and a fourth resistor 4 ohms in series. A battery of emf 12v and internal resistance 6 ohms is connected across the circuit. Find the total current in the circuit and terminal voltage across the battery. [16 MARKS]

OR

(b) A series RLC circuit with R = 10 ohms, L = 10 mH and C = 1µF has an applied voltage of 200V at resonant frequency. Calculate the resonant frequency, the current in the circuit and the voltages across the elements at resonance. Also determine the quality factor and bandwidth. [16 MARKS]


12. (a) Describe the construction and operating principle of a d.c. motor with necessary diagrams. [16 MARKS]

OR

(b) Describe the construction and working of a single phase transformer with neat sketch. [16 MARKS]


13. (a) Explain the characteristics of a d.c. generator with necessary diagrams. Also, discuss the method of determination of critical resistance (RC). [16 MARKS]

OR

(b) (i) Explain the different methods of starting of synchronous motors. [8 MARKS]

(ii) Describe the operating principles of an alternator. [8 MARKS]


14. (a) Describe the working principle of a moving coil ammeter with a neat diagram. [16 MARKS]

OR

(b) Explain the operation of an instrument used to measure electrical power with necessary diagrams.


15. (a) (i) Discuss the different types of connections made in the primary and secondary of a three phase transformer. [10 MARKS]

(ii) Explain the significance of a back emf in a d.c. motor. [6 MARKS]

OR

(b) Three 40 ohms non-inductive resistances are connected (i) in star (ii) in delta across 200V, 50Hs, 3 phase lines. Calculate the power taken from the supply mains in each case. If one of the three resistors is disconnected, what would be the power taken from the supply mains in each case? [16 MARKS]

BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2007

Annual Pattern – First Year

Aeronautical Engineering

EE1X02 – BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

(Common to Automobile Engineering/Marine Engineering/Mechanical Engineering/Production Engineering)

(Regulation 2004)

Time: Three hours                                                     Maximum: 100 Marks

Answer ALL questions.

PART A – [10 X 2 = 20 MARKS]

1. State Kirchoff’s voltage law with suitable electric circuit.

2. an alternating current of frequency 60Hz has a maximum value of 120A. Write down the equation for its instantaneous value.

3. what is the function of commutator in DC machine?

4. Why is the range of efficiency in Transformer higher than those of other electrical machines?

5. Which type of induction motor would you use for the following applications?

a. Wet grinders

b. Food processors and mixers

c. Ceiling fan

d. Lift and cranes

6. Name any two methods of starting of a synchronous motor.

7. How does a PN junction behave under forward and reverse biased condition?

8. Sketch the VI characteristics of a SCR and mark various regions of operations.

9. Why are AM systems preferred in broadcasting than FM systems?

10. What are function performed by the receiving modem?

PART B – [5 X 16 = 80 MARKS]

11. (a) (i) A filament lamp is rated for 100W, 110V. Find the value of the resistance to be connected in series with this lamp so that it can be operated on a 230V supply. What is the power loss in the resistor? [8 MARKS]

(ii) A voltage wave has the variations as explained. The graph is between V(t) and t(s). v(t) in y-axis and t(s) in x-axis. The voltage raises linearly w.r.t time till it reaches 6V in 3 seconds. At 3seconds it immediately raises to 8V and remains constant for a second. When t=4s the voltage falls down reaches 0 and raises linearly w.r.t. time in negative side as in the positive side. When t=7 V=-6 and when t=8 V=0. [8 MARKS]

[OR]

(b) (i) A coil of resistance 10Ω and inductance 0.1H is connected in series with a 150µF capacitor across 200V, 50Hz supply. Calculate impedance, current and power factor. [6 MARKS]

(ii) Explain with the help of a neat sketch, the principle of working of a single-phase induction type energy meter. [10 MARKS]


12. (a) (i) Draw the circuit diagram of any two types of DC generators. Sketch and explain the load characteristics of these generators. [10 MARKS]

(ii) What are the methods by which the speed of DC motor be controlled? Explain any one method applied to DC shunt motor. [6 MARKS]

OR

(b) (i) Develop an approximate equivalent circuit for a single phase two winding transformer. State the assumptions made. [8 MARKS]

(ii) A 220/440 V single phase transformer has the following test result:

OC Test: 220V, 1A, 70W on Low voltage side.

SC Test: 20V, 2A, 100W on High voltage side.

Obtain the equivalent circuit parameters of the transformer referred to LV side. [8 MARKS]



13. (a) (i) What are the different methods of starting 3-phase squirrel cage induction motor? Describe with a connection diagram, the working of any one starter. [8 MARKS]

(ii) Explain the operation of shaded pole induction motor with neat diagrams. What are the disadvantages of this motor? [8 MARKS]

OR

(b) (i) Starting from fundamentals, derive the emf equation of an Alternator. Discuss the effect of winding factor on the induced emf. [8 MARKS]

(ii) Write short notes on V curve of a Synchronous motor. [8 MARKS]


14. (a) (i) What is inductive transducer? Explain the working of LVDT in brief. [8 MARKS]

(ii) With suitable diagram explain the operation of n-type enhancement mode MOSFET. Also draw its transfer characteristics. [8 MARKS]

OR

(b) (i) Explain the working principle and operation of any one photoelectric device with neat sketch. Sketch the V-I characteristic also. [8 MARKS]

(ii) Draw the circuit of a full-wave bridge rectifier and explain its working principle. [8 MARKS]


15. (a) (i) Draw the block diagram of a communication system and explain its operation. [8 MARKS]

(ii) Discuss the principle of operation of Mobile phones. [8 MARKS]

OR

(b) (i) Draw the block diagram of optical fibre communication system and explain it. [8 MARKS]



(ii) With neat diagram, explain the conceptual view of ISDN connection feature. [8 MARKS]

EC 1255 – MEASUREMENT AND INSTRUMENTATION

B.E./B.Tech. DEGREE EXAMINATION, MAY / JUNE 2006

FOURTH SEMESTER

ELECTRONICS AND COMMUNICATION ENGINEERING

EC 1255 – MEASUREMENT AND INSTRUMENTATION

(Regulation 2004)

TIME: THREE HOURS                                             MAXIMUM: 100 MARKS

ANSWER ALL QUESTIONS

PART A – [10 X 2 = 20 MARKS]

1) Differentiate zero drift and span drift.

2) Compare attraction and repulsion type instruments.

3) Define deflection sensitivity.

4) Give the characteristics of probes used in CRO.

5) Define harmonic distortion.

6) What is a spectrum analyzer?

7) What are the advantages of digital instruments?

8) Give the various types of digital volt meter.

9) What is the necessity of digital interface?

10) Differentiate synchronous from asynchronous transmission of data.

PART B – [5 X 16 = 80 MARKS]

11) (i) Give a block diagram of computer – based data Acquisition system. Explain each block elaborately. [10 MARKS]
(ii) Discuss in detail the various techniques of multiplexing. [6 MARKS]

12) (a)(i) What are the types of errors? [6 MARKS]
(ii) With a neat circuit diagram and phasor explain Anderson Bridge. Derive suitable expression. What are its advantages and disadvantages? [10 MARKS]

OR

(b)(i) With a neat circuit diagram and phasor diagram discuss in detail about schering bridge. Find an expression for the capacitance, and dissipation factor. [6 MARKS]
(ii) With a neat diagram explain the (1) Construction (2) Working (3) torque equation and (4) advantages and disadvantages of a PMMC instrument. [10 MARKS]

13) (a)(i) With a neat diagram explain the various parts of CRO. [10 MARKS]
(ii) Explain the working of a Qmeter with a neat circuit diagram. List the applications of Q meter. [6 MARKS]

OR

(b)(i) With a block diagram, explain in detail sampling oscilloscopes. [10 MARKS]
(ii) Draw a test setup to measure power at high frequencies. [6 MARKS]

14) (a) (i) With a neat block diagram, explain signal generator. [6 MARKS]
(ii) With a neat block diagram, explain the working of harmonic distortion analyzer and intermodulation distortion meter. [10 MARKS]

OR

(b) (i) Draw a block diagram of heterodyne frequency generator and explain. [6 MARKS]
(ii) Define standing wave ratio. Explain in detail the method of measuring standing wave ratio. [10 MARKS]

15) (a) (i) With a neat block diagram and circuit, explain in detail the digital frequency meter. [8 MARKS]
(ii) Explain with neat diagram the working of integrating type digital voltmeter. [8 MARKS]

OR

(b) (i) With a neat block diagram explain the time interval measurement. [8 MARKS]
(ii) Explain the working of a potentiometric DVM, with a neat block diagram. [8 MARKS]

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2007

Third Semester

(Regulation 2004)

Electronics and Communication Engineering

EC 1201 – DIGITAL ELECTRONICS

(Common to B.E. Part – Time Second Semester – Regulation 2005)

Time: Three hours                                                              Maximum: 100 Marks

Answer ALL questions.

PART A – [10 X 2 = 20 MARKS]

1. Convert (0.513)10 to octal.
2. Express F= A + B’C as sum of minterms.
3. Draw the logic diagram for X = AB + B’C.
4. Implement F = (AB’ + A’B)(C + D’) with only NOR gates.
5. What is a Moore machine?
6. Give the characteristic expression of a JK flip flop.
7. What is a flow table?
8. What is Rate?
9. Draw the logic diagram of a memory cell.
10. What is a combinational PLD?