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Code No: R05420201

R05

Set No. 2

IV B.TECH II SEM – REGULAR / SUPPLEMENTARY EXAMINATIONS IV B.Tech II Semester Regular Examinations,May 2010 MAY -2010 UTILIZATION OF ELECTRICAL ENERGY Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. With the help of suitable equations, explain the various factors to be considered in calculating the tractive effort of an electric locomotive. [16] 2. (a) Describe the construction and operation of coreless induction furnace. (b) Describe in detail and with a neat sketch the vertical core type furnace.[8+8] 3. (a) What are the various methods of electric welding? (b) Describe the various types of electric Arc welding processes.

[8+8]

4. With the help of a complete Speed-Time curve, discuss how different parameters of this curve change with the type of train service. [16] 5. (a) What is meant by load equalization? (b) Give reasons why the method of load equalization normally adopted with induction motors and dc shunt motors, but can not adopted with synchronous motor. [6+10] 6. Discuss the conditions that are needed for successful regenerative braking and suitability of d.c shunt, series and induction motor for regenerative braking. [16] 7. (a) Compare the merits and demerits of filament lamps and fluorescent lamps. (b) A work shop measures 15m×36m, 20 lamps of 500w each are used for lighting the workshop. The luminous efficiency of lamp is 15 Lumens/watt. Determine the illumination on the working plane, if the depreciation factor is 0.7 and the coefficient of utilization is 0.5. [6+10] 8. (a) Prove that the illumination on any surface is proportional to cos3 θ where θ is the angle between normal at that point and direction of flux. (b) An advertisement board 5m square is fixed to a wall with bottom edge near the ground. A lamp fitting giving a luminous intensity of 4000 cd in all directions towards the board is fixed level with the bottomof the board and 7m away, giving maximum illumination at the centre of the bottom edge. Find the illumination: i. At the centre of the bottom edge ii. At the centre of top edge iii. At one of top corners. ????? www.QuestionPaperDownload.com

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Code No: R05420201

R05

Set No. 4

IV B.TECH II SEM – REGULAR / SUPPLEMENTARY EXAMINATIONS IV B.Tech II Semester Regular Examinations,May 2010 MAY -2010 UTILIZATION OF ELECTRICAL ENERGY Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. A 100C.P. lamp is hung 2m above the center of a circular area of 3m diameter. Determine the illumination at: (a) The center of area (b) A point on the circumferance of the area (c) Average illumination. Find also the average illumination, if a reflector of 50% efficiency is used. [16] 2. (a) Explain the advantages and applications of eddy current heating. (b) A laminated wooden board 30 × 15 × 2.5 cubic cm thick to be heated from 10 0 C to 160 0 C in 10 minutes by dielectric heating. The frequency employed is 30 MHZ. The specific heat of wood is 1465J/kg/0 C. [6+10] 3. What are the methods available for starting induction motors? Draw connection diagrams for a star-delta starter and Auto-Transformer starter. [16] 4. Discuss the various types of functions performed by the tractive effort developed by a traction Unit. [16] 5. Explain in detail the advantages of composite system of traction employing 25KV a.c as traction system. [16] 6. (a) Name and describe various resistance welding processes. (b) Enlist the advantages of AC arc welding machines.

[8+8]

7. (a) Discuss the laws of illumination and its limitations is actual practice. (b) A drawing office containing a number of boards and having a total effective area of 70m2 is lit by a number of 40 watts incandescent lamps giving 11 lumens/watt. An illumination of 80 lux is required on the drawing boards. Assuming that 60% of the total light emitted by the lamps is available for illuminating the drawing boards, estimate the number of lamps required.[8+8] 8. A locomotive for a city service is proposed to have a scheduled speed of 45 kmph and the distance between the stations is 2.8 km. The track is assumed to be level. Each stop is 30 sec. duration. Using simplified N-T curve, calculate maximum speed. α = 2kmphps; β = 3.2 kmphps. The dead weight is 16 tonnes; rotational inertia is 10% of dead weight. Track resistance is 40 N/tonne and overall efficiency is 80%. Find: www.QuestionPaperDownload.com

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Code No: R05420201

R05

Set No. 4

(a) Maximum power output from driving axles (b) Specific energy consumption.

[16] ?????

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Code No: R05420201

R05

Set No. 1

IV B.TECH II SEM – REGULAR / SUPPLEMENTARY EXAMINATIONS MAY -2010 IV B.Tech II Semester Regular Examinations,May 2010 UTILIZATION OF ELECTRICAL ENERGY Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) State the principle of operation application and relative merits & demerits of direct type of induction furnace. (b) What must be useful rating of a tin melting furnace in order to melt 50 Kg of tin per hour. Melting temperature of tin = 2350 , specific heat = 0.055, Latent heat of liquidification =13.31 kcal/kg. Take the initial temperature of the metal is 1500 C. [8+8] 2. Discuss the merits and demerits of the induction motor fro traction duties. What is your view regarding its adoption for future traction? [16] 3. (a) Explain why it is economical to use few large sources of light mounted high for industrial use than many sources of low output. (b) What are drawbacks of direct lighting systems and how these are over come? [8+8] 4. What is coefficient of adhesion? How the value of coefficient of adhesion affects the slipping and skidding of the driving wheels of traction unit? [16] 5. Draw the connection diagram of the equipment for automatically starting: (a) A squirrel cage induction motor by means of an auto-transformer (b) A slip ring induction motor by means of resistive in the rotor circuit.

[8+8]

6. (a) What do you understand by: i. Resistance welding ii. ARC welding. (b) Describe: i. Carbon Arc welding process ii. Shielded metal Arc welding process.

[8+8]

7. The distance between two stations is 1.92 km. The schedule speed and duration of stops respectively are 40 kmph and 20 sec. Assume quadrilateral approximation of Speed-Time curve. Cresting and braking retardations are 0.16 kmphps and 3.2 kmphps respectively. Determine the acceleration if speed at end of accelerating period is 60.8 kmph. Also determine the duration of wasting period. [16] 8. (a) What is the photometry? Describe photovoltaic method of photo metry and discuss its limitations. www.QuestionPaperDownload.com

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Code No: R05420201

R05

Set No. 1

(b) Two lamps one of 300 CP and another 800 CP are hung at height of 10 metres and 30 metres respectively. The horizontal distance between the poles is 100 metres. Determine the illumination between the mid point of the poles on the ground. [8+8] ?????

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Code No: R05420201

R05

Set No. 3

IV B.TECH IIIV SEM – REGULAR / SUPPLEMENTARY EXAMINATIONS MAY -2010 B.Tech II Semester Regular Examinations,May 2010 UTILIZATION OF ELECTRICAL ENERGY Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Discuss how different parameters of Speed-Time curve will vary with the type of train service. [16] 2. (a) What are the factors affecting specific energy consumption? (b) Derive an expression for specific energy consumption.

[8+8]

3. (a) What do you understand by electric heating? What are the advantages over other methods of heating? (b) What are the characteristics of heating element? Explain the design of heating element in resistance heating. [8+8] 4. Discuss scope of application of battery drive in electric traction.

[16]

5. (a) What are the various methods of welding? (b) What are the advantages of coated electrodes in welding process?

[16]

6. Explain the various factors to the taken into account for designing schemes for: (a) Flood lighting (b) Highway lighting.

[16]

7. (a) Compare the 3-Phase induction motor and DC shunt motors from the point of view of ease of speed control. (b) A 230V, dc shunt motor runs at 900 rev/min on no-load with full field and has an armature resistance of 0.7 ohms. The armature current to give full load torque is 15A. if a resistance of 6 ohms is put in series with the armature, determine the speed-torque characteristic. Also find the current drawn from the supply. [8+8] 8. (a) What are polar curves as applied to light sources? Show how these curves are used for finding in MHCP and MSCP. (b) Prove that the relationship between plane angle and solid angle is: ). ω = 2π(1 − Cosφ 2 ?????

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