GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
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Subject Code: 2160907 Date: 16/12/2019Subject Name: Utilization of Electrical Energy and Traction
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Classify electrical drive? Explain any one with its applications. 03
(b) What do you understand by Tractive efforts? Derive the expression for 04
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the same.(c) Enlist different types of electric braking. Explain Regenerative braking 07
of D.C Shunt motor along with its application.
Q.2 (a) Write properties of resistance heating elements. 03
(b) Explain factors affecting selection of drive. 04
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(c) A train has schedule speed of 30 kmph over a level track, distance 07between stations being 1 km. Station Stopping time is 20 seconds.
Assuming braking retardation of 3 kmphps and maximum speed 25
percent greater than average speed, calculate acceleration required to
run the service if the speed-time curve is approximated by a trapezoidal
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curve.OR
(c) Explain operation of an electrical drive in all the four quadrants. 07
Q.3 (a) Explain following term (1) co-efficient of adhesion (2) schedule speed 03
(3) specific energy consumption:
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(b) Classify electric Heating. Write advantages of electric Heating. 04(c) Explain the design procedure of heating element. 07
OR
Q.3 (a) Compare AC and DC arc welding. 03
(b) State and explain laws of illumination. 04
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(c) Explain the trapezoidal speed - time curve with necessary equations. 07Q.4 (a) Define the following terms with its range w.r.to illumination. (a) 03
Utilization Factor,(b) Waste light factor, (c) glare
(b) State and explain Faraday’s laws of electrolysis. 04
(c) Explain Ajax-Wyatt Furnace with advantages, disadvantages and 07
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applications.OR
Q.4 (a) Compare AC and DC Traction system. 03
(b) A slab of insulating material 150 cm2 in area and 1 cm thick is to be heated by 04
dielectric Heating. The Power required is 400 W at 30 MHz Material has a
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relative permittivity of 5 and Power factor of 0.05. Absolute permittivity =8.854*10-12 F/m. determine necessary voltage.
(c) Explain electro-deposition processes. Discuss various factors 07
governing the electro deposition processes.
Q.5 (a) Discuss butt and flash butt welding with diagram. 04
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(c) What is electroplating. Explain process of electro plating. 07OR
Q.5 (a) Write principle of air-conditioning and enlist advantages of it. 03
(b) What is flood lighting? Where it is used? 04
(c) Explain sodium vapour lamp with neat sketch. 07
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