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Previous Year Exam Questions of Utilization of Electric Energy of bput - UEE by Bput Toppers

  • Utilization of Electric Energy - UEE
  • 2018
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Electrical and Electronics Engineering
  • B.Tech
  • 20 Offline Downloads
  • Uploaded 1 year ago
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Registration No : Total Number of Pages : 03 6th Semester Regular Examination 2017-18 UTILIZATION OF ELECTRICAL ENERGY BRANCH : EEE Time : 3 Hours Max Marks : 100 Q.CODE : C504 Answer Part-A which is compulsory and any four from Part-B. The figures in the right hand margin indicate marks. Answer all parts of a question at a place. Q1 a) b) c) d) e) f) g) Part – A (Answer all the questions) Answer the following questions : multiple type or dash fill up type : Light waves travel with a velocity of (A) 3 x 1010cm/s (B) 3 x 1012cm/s (C) 3 x 1015 cm/s (D) 3 x 1018 cm/s. Candela is the unit of (A) Luminous flux (B) Luminous intensity (C) Wavelength (D) None of the above. Luminous efficiency of a fluorescent tube is (A) 5- 10 lumens/watt (B) 15-20 lumens/watt (C) 30 - 40 lumens/watt (D) 60 - 65 lumens/watt. Power factor of fluorescent lamps is __________. Which braking is not possible in series motor? (A) Regenerative braking. (B) Dynamic braking. (C) Counter electric current braking. (D) Rheostat braking Polarity of supply voltage is reversed in which type of braking? (A) Regenerative braking. (B) Dynamic braking. (C) Plugging. (D) None of these. A motor has a thermal heating time constant of 50 mm. When the motor runs continuous of full scale, its final temperature rise is 80° C, what would be the temperature rise after 1 hour, if the motor runs continuously on full load? (A) 55.9°. (B) 58°. (C) 56°. (D) 60°. B.Tech. PEL6D004 (2 x 10)

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h) i) j) Q2 a) b) c) d) e) f) g) h) i) j) Q3 a) b) Q4 a) b) Q5 a) b) Spot welding is used to weld metal pieces whose thickness (A) Should be greater than 12 mm (B) Lesser than 12 mm (C) Lies between 15 to 20 mm (D) Greater than 20 mm Seam welding is not used for the (A) Welding in tanks (B) Welding in transformers (C) Welding in air crafts (D) Welding alloys of copper The advantage of electric braking is (A) it is instantaneous (B) more heat is generated during braking (C) it avoids wear of track (D) motor continue to remain loaded during braking. Answer the following questions : Short answer type : Name the different methods of induction heating. Draw the speed-time curve of traction drives. What is the difference between illumination and light? Derive the term depreciation factor and maintenance factor for illumination Why series motors are preferred for electric traction? Why drooping characteristics of supply voltage is required for arc welding and how it is obtained? Why individual drive is preferred over group drive? What are the different types lighting schemes? What are the essential properties required for selecting material for heating element? Write the advantages/ disadvantages of 25 kV ac system over dc system for electric traction. Part – B (Answer any four questions) A small assembly shop 16m long, 10 m wide and 3 m up to trusses is to be illuminated to a level of 200 lux. The utilization and maintenance factors are 0.74 and 0.8 respectively. Calculate the number of lamps required to illuminate the whole area if the lumen output of the lamp selected is 3000 lumens. Describe the construction and principle of operation and application of fluorescent lamp. (2 x 10) (10) (5) Explain with neat sketches, the construction, principle of operation and application of three different types of resistance welding. Give its demerits with respect to arc welding. Write in brief about the properties of heating element material in resistance furnace (10) A 256 tone motor coach train with 4 motors takes 20 second to attend a speed of 40 Km/h from rest at 1% gradient. Gear ratio is 1 to 3.5, Gear efficiency =0.95, Wheel dia=92 cm, Resistance of train 40Nw per tonne, Rotational inertia 10% of weight. Find the torque developed by the each motor. Discuss the various application of dielectric heating (10) (5) (5)

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Q6 a) Explain the principle of “dielectric heating”. Discuss the advantages and important application of “dielectric heating”. What are the advantages and disadvantages of electric traction over other types of traction system? (10) (10) b) A 240 tonne train with 10% rotational inertia effect is started with uniform acceleration and reaches a speed of 50 kmph in 25 seconds on level road. Find the specific energy consumption assuming trapezoidal speed time curve. The acceleration is 2 kmphps, breaking retardation 3 kmphps and the distance between the two stations is 2.5 km, efficiency of motor is 0.9,track resistance is 5 kg/tonne. State and explain laws of illumination. a) Explain clearly the torque speed characteristics of AC and DC motors. (10) b) Discuss the various factors which are required to be considered for selecting a motor. (5) a) Write short note (any TWO) : (a) Arc welding (b) Coreless induction furnace (c) Sodium Vapour lamp Explain how regenerative breaking can be obtained in traction motors. (10) b) Q7 Q8 Q9 a) b) (5) (5) (5)

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