Friday, July 27, 2012

EC2151 ELECTRIC CIRCUITS AND ELECTRON DEVICES(ECED) RE-EXAM SPECIAL IMPORTANT QUESTIONS AND ANNA UNIVERSITY PREVIOUS SEMESTER QUESTION PAPERS

EC2151 ELECTRIC CIRCUITS AND ELECTRON DEVICES
ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER

UNIT I CIRCUIT ANALYSIS TECHNIQUES
UNIT II TRANSIENT RESONANCE IN RLC CIRCUITS
UNIT III SEMICONDUCTOR DIODES
UNIT IV TRANSISTORS
UNIT V SPECIAL SEMICONDUCTOR DEVICES
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ECED EC2151  SYLLABUS: CLICKHERE
EC2151 ECED IMPORTANT QUESTIONS : CLICKHERE

EC2151 ECED : | Ques. bank 1| Ques bank 2 | ques bank 3 |

EC2151 ECED SUBJECT NOTES/LECTURE NOTES : | CLICKHERE | LINK2: CLICKHERE |
Previous Year(SEMESTER) Question Papers
| MAY/JUNE 2010 | MAY/JUNE 2009 | NOV/DEC 2009 | NOV/DEC 2010| MODEL QP | MAY/JUNE 2011 | NOV/DEC 2011 | MAY/JUNE 2012 |
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EC2151 ELECTRIC CIRCUITS AND ELECTRON DEVICES ECED NOV/DEC 2010 ANNA UNIVERSITY QUESTION PAPER

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010
Second Semester
Computer Science and Engineering
EC 2151 — ELECTRIC CIRCUITS AND ELECTRON DEVICES
(Common to Biomedical Engineering, Electronics and Communication Engineering
and Information Technology)
(Regulation 2008)
Time : Three hours Maximum : 100 Marks
PART A — (10 × 2 = 20 Marks)

1. Find Req of the restive network .
2. Determine the current drawn by the source as shown in
3. For the circuit shown in fig.3 determine the value of Q at resonance and
Bandwidth of the circuit.
4. A Series RC circuit consists of resistor of 10[1] and a capacitor of 0.1F as shown
in Fig.4. A constant voltage of 20v is applied to the circuit at t=0. Determine
voltage across resistor and capacitor.
5. State Mass-Action law.
6. Define diffusion capacitance.
7. Define Base width modulation and bring out its consequences.
8. Mention the advantages of MOSFET over JFET.
9. Draw the two transistor model of an SCR with its characteristic curve.
10. Under what principle does a photo voltaic cell work?
PART B — (5 × 16 = 80 Marks)
11. (a) (i) Use Thevenin's theorem to find the current through 5 resistor (Marks 8)
(ii) Find the voltage across 2 resistor in fig.6 by using super position theorem. (Marks 8)
Or
(b) (i) Determine current flowing through the 5 resistor in the circuit Norton theorem. (Marks 8)
(ii) Determine the maximum power delivered to the load in the circuit (Marks 8)

12. (a) (i) Find the complete solution for the current in a RLC circuit for a sinusoidal input. (Marks 8)
(ii) The circuit consists of R = 10, L = 0.5 H and C = 200 Âµ F. If the switch is closed when f = 30°. Determine the current equation. (Marks 8)
Or
(b) (i) Consider the single tuned circuit
1. Resonant frequency
2. Output voltage at resonance and
3. Maximum output voltage.
Assume Rs>>wrL, and k=0.9. (Marks 8)
(ii) With neat diagram, obtain gain of a double tuned amplifier with critical value of mutual inductance. (Marks 8)

13. (a) (i) State continuity equation and prove that concentration of changes is independent of time with zero electric field. (Marks 8)
(ii) With neat diagram, explain the formation of PN junction and derive its depletion width. (Marks 8)
Or
(b) (i) What is the breakdown mechanism found in Zener diode? Explain it with neat diagram. (Marks 8)
(ii) Write detailed notes on space charge and diffusion capacitance. (Marks 8)

14. (a) Explain the construction and working principle of a JFET and obtain its characteristic parameters. (Marks 16)
Or
(b) Explain the operation of a Depletion mode MOSFET and its comparison over enhancement MOSFET with neat diagrams. (Marks 16)

15. (a) Discuss the construction and operation of a Tunnel Diode with neat energy band diagram. (Marks 16)
Or
(b) Write detailed notes on:
(i) DIAC and TRIAC (Marks 5)
(ii) Photodiode and Phototransister (Marks 5)
(iii) LED and LCD (Marks 6)

CE2201 MECHANICS OF SOLIDS PREVOIUS YEAR NOV/DEC 2009 ANNA UNIVERSITY QUESTION PAPER

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009
Third Semester
Civil Engineering
CE 2201 — MECHANICS OF SOLIDS
(Regulation 2008)
Time : Three hours Maximum : 100 Marks
PART A — (10 × 2 = 20 Marks)
1. State Hooke’s law.
2. What is modulus of elasticity?
3. What is perfect frame?
4. State the two analytical methods for finding out the forces in the members of a perfect frame.
5. What is shear force in a beam?
6. What is bending moment in a beam?
7. What is slope of a beam?
8. What is deflection of a beam?
9. State the assumptions for shear stress in a circular shaft subjected to torsion.
10. What is stiffness of a spring?
PART B — (5 × 16 = 80 Marks)
11. (a) A hollow cylinder 2 m long has an outside diameter of 50 mm and inside diameter of 30 mm. If the cylinder is carrying a load of 25 kN, find the stress in the cylinder. Also find the deformation of the cylinder, if the value of modulus of elasticity for the cylinder material is 100 GPa.
Or
(b) A load of 5 kN is to be raised with the help of a steel wire. Find the minimum diameter of the wire, if the stress is not to exceed 100 MPa.
12. (a) A gas cylinder of internal diameter 40 mm is 5 mm thick. If the tensile stress in the material is not to exceed 30 MPa, find the maximum pressure which can be allowed in the cylinder.
Or
(b) A cylinderical shell of 500 mm diameter is required to withstand an internal pressure of 4 MPa. Find the minimum thickness of the shell, if maximum tensile strength for the plate material is 400 MPa and efficiency of the joints is 65%. Take factor of safety as 5.
13. (a) A cantilever beam of 2 m long carries a uniformly distributed load of 1.5 kN/m over a length of 1.6 m from the free end. Draw shear force and bending moment diagrams for the beam.
Or

(b) A simply supported beam 6 m long is carrying a uniformly distributed load of 5 kN/m over a length of 3 m from the right end. Draw shear force and bending moment diagrams for the beam and also calculate the maximum bending moment on the beam.
14. (a) A simply supported beam of span 3 m is subjected to a central load of 10 kN. Find the maximum slope and deflection of the beam. Take 4 6 mm 10 12 I × = and E = 200 GPa.
Or
(b) A steel joist, simply supported over a span of 6 m carries a point load of 50 kN at 1.2 m from the left hand support. Find the position and magnitude of the maximum deflection. Take 2 12 mm N 10 14 EI − × = .
15. (a) Find the angle of twist per metre length of a hollow shaft of 100 mm external diameter and 60 mm internal diameter, if the shear stress is not to exceed 35 MPa. Take modulus of rigidity G = 85 GPa.
Or
(b) A leaf spring is to be made of seven steel plates 65 mm wide and 6.5 mm thick. Calculate the length of the spring, so that it carries a central load of 2.75 kN, the bending stress being limited to 160 MPa. Also calculate the deflection at the centre of the spring. Take E for the spring material as 200 GPa.

AG2211 APPLIED GEOLOGY AG 2211 ANNA UNIVERSITY NOV/DEC 2009 PREVIOUS YEAR QUESTION PAPER

B.E./B.Tech DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009
Third Semester
Civil Engineering
AG 2211 — APPLIED GEOLOGY
(Regulation 2008)
Time : Three hours Maximum : 100 Marks

Use neat sketches wherever necessary
PART A — (10 × 2 = 20 Marks)
1. Give a brief account of the Earth’s interior.
2. What are the effects of weathering on the engineering properties of rocks?
3. Write the chemical composition, physical properties and uses of Calcite.
4. List the properties of petroleum bearing reservoir rocks.
5. Write about the mineral composition, origin and properties and uses of basalt.
6. Bring out the differences between dolerite and pegmatite.
7. Briefly describe Dip and Strike of rocks use a neat diagram.
8. What is the difference between the Wenner and Schlumberger methods?
9. Define the terms ‘overlap’ and ‘parallax’.
10. Give the functions of a breakwater.

PART B — (5 × 16 = 80 Marks)

11. (a) Explain the work of a river and describe the various erosional and depositional landforms created by a river.
Or
(b) How are earthquakes caused? Give an account of the earthquake belts in India.
12. (a) Give a detailed account of the chemical composition, physical properties, origin, occurrence, engineering behaviour and uses of the clay minerals.
Or
(b) Describe the varieties, composition, properties, origin & Indian occurrences of coal.
13. (a) Describe the mineral composition, texture, origin, engineering properties and uses of Granite, Limestone, Quartzite and Schist.
Or
(b) List the various laboratory and field tests to be carried out to determine the engineering properties of rocks.
14. (a) Classify folds and faults in rocks and explain how they influence the design of dams.
Or

(b) Write an elaborate account of the seismic methods of investigation in civil engineering.
15. (a) Classify aerial photographs and explain in detail their role in civil engineering surveys.
Or
(b) Give a detailed account of the types of landslides, the causative factors and the methods to prevent landslides.

APPLIED GEOLOGY AG2211 PREVIOUS YEAR QUESTION PAPER | APRIL/MAY 2010 APPLIED GEOLOGY AG 2211 QUESTION PAPER

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010
Third Semester
Civil Engineering
AG2211 — APPLIED GEOLOGY
(Regulation 2008)
Time: Three hours Maximum: 100 Marks
PART A — (10 × 2 = 20 Marks)
1. What is weathering of rocks?
2. Explain Exfoliation.
3. Write a note on plane of symmetry of Quartz.
4. Write the Mohs Scale of hardness.
5. Distinguish between Granite and Marble rocks.
6. List two rock types of sedimentary and metamorphic group.
7. What are strike and dip of rocks?
8. Distinguish between seismic refraction and reflection methods.
9. Write a short note on vertical exaggeration.
10. What is grouting?
PART B — (5 × 16 = 80 Marks)
11. (a) Describe the land forms produced by the geological work of river.
Or
(b) Explain in detail the process of physical and chemical weathering of rocks and minerals.
12. (a) Describe the physical properties of minerals with examples.
Or
(b) What is coalification? Describe the types of coal and its properties.
13. (a) Describe the different types of rocks. Give the classification, texture and structure of igneous rocks.
Or
(b) Explain in detail the various engineering properties of rocks.
14. (a) Discuss in details Electrical method of Investigation for groundwater exploration.

Or
(b) What is a fault? Discuss various types of faults and add a note on its application in engineering projects.
15. (a) Explain various structural constraints which should be taken into account during the construction of tunnel.
Or
(b) What are causes for landslide? What are the various parameters applied to mitigate landslide?