Download GTU BE/B.Tech 2018 Winter 6th Sem New 2160907 Utilization Of Electrical Energy And Traction Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018

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Subject Code: 2160907

Subject Name: Utilization of Electrical Energy and Traction

Time: 02:30 PM TO 05:00 PM

Date: 15/12/2018

Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Attempt all:

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   1. Justify : DC shunt motor should never be started on load. MARKS 03
   2. Draw labelled typical speed-time curve for main line service. MARKS 04
   3. Write principle of dielectric heating. MARKS 03
2. 1. Attempt all :

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   1. List main causes of failure of heating elements. MARKS 04
   2. State and explain in brief Lambert’s cosine law. MARKS 07
3. 1. Write classification of electrical drive in detail. MARKS 07
   2. Write detail specifications of squirrel cage induction motor. MARKS 03

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   3. Explain different braking methods used for DC series motor. MARKS 04

   OR

   1. State various types of current collectors in common use for overhead contact system. Describe with a neat diagram the pantograph collector. MARKS 07
4. 1. Explain applications of high frequency eddy current heating. MARKS 03

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   2. Suggest suitable A.C. & D.C. drives for following applications. Give reasons for the same. (1) Pump (ii) Hoist.(Crane) MARKS 04
   3. Explain working of LPMV lamp with necessary diagram. MARKS 07

   OR

   1. Explain concept of microwave heating. MARKS 03
   2. List different methods of electrical heating. Explain resistance heating. MARKS 04

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   3. Draw and explain electrical circuit used in domestic refrigerator. MARKS 07
5. 1. State Faraday’s Laws of electrolysis. MARKS 03
   2. Compare Resistance and Arc welding. MARKS 04
   3. EMU has an average speed of 42 kmph on level track between stops 1400m apart. It-is accelerated at 1.7 kmphps & braked at 3.3 kmphps. Draw speed-time curve for run indicating all numerical values. MARKS 07

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   OR

   1. Explain principle of air conditioning. MARKS 03
   2. What is electro plating? Describe it in detail. MARKS 04
   3. Explain Ajax Wyatt type induction furnace with diagram. MARKS 07

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6. 1. Define: (i) Candle power (i1) Luminous intensity (ii1) Utilization factor MARKS 03
   2. State and explain laws of illumination. MARKS 04
   3. Deduce the expression for the total tractive effort for propulsion of train considering acceleration, up the gradient, to overcome resistance. MARKS 07

   OR

   1. Discuss factors affecting scheduled speed. MARKS 03

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   2. Write different steps for design lighting scheme considering various parameters. MARKS 04
   3. Write principle of resistance welding. Explain Butt welding. MARKS 07

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