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2003 Course Utilization of Electrical Energy

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Total No. of Questions : 12] P982 [Total No. of Pages : 3 [3664]-179 B.E. (Electrical) UTILIZATION OF ELECTRICAL ENERGY (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates:1) Answer 3 questions from Section - I and 3 questions from Section - II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) What are different methods of electric heating? Describe briefly the methods of direct and indirect resistance heating. List the application of these two methods. [8] Name and describe various resistance welding processes. [8] OR Q2) a) b) Q3) a) b) Discuss advantages of electrically produced heat. State the properties of a heating element that you will look for. [8] A 15 kW, 220 V, single phase resistance oven employs nickelchrome wire for its heating elements. It the wire temperature is not to exceed 1000 C and the temperature of the charge is to be 600 C. Calculate the diameter and length of the wire. Assume radiating efficiency to be 0.6 and emissivity as 0.9. For Nickel chrome resistivity is 1.016 10-6 -m. [8] Describe the process of extraction of metals. Explain how zinc and aluminium are extracted from their ores. [8] What is electroplating and what for is it done? Describe the various operations involved in electroplating. [8] P.T.O. OR Q4) a) b) Q5) a) b) What is the principle of electrodeposition & state and explain the factors which the quality of electro-deposition depends. [8] Draw electric ckt of a refrigerator and explain its working. How can temperature inside the refrigerator be adjusted? [8] Explain with a neat diagram the principle of operation of sodium vapour lamp. Mention its use. [10] State and describe various lighting schemes. [8] OR Q6) a) b) c) Describe with the help of a neat diagram the construction and working of high pressure mercury vapour lamp. [10] A shop measuring 15m 35m is illuminated by 20 lamps of 500W each. The luminous efficiency of each lamp is 15 Lumens/Watt. Allowing a depreciation factor of 0.7 and coefficient of utilization of 0.5, determine the illumination on working plane. [4] Discuss various factors which have to be considered while designing any lighting scheme. [4] SECTION - II Q7) a) b) Discuss the merits and demerits of steam engine drive and electric drives used for traction. [8] Describe the various types of current collectors in common use for overhead contact system. [8] OR Q8) a) b) Describe the different systems of track electrification. [8] Draw a general block diagram for A.C. electric locomotive and explain [8] it. Q9) a) Draw the speed-time curves of electric trains for i) Main line service and ii) Suburban service and explain their characteristics. [3664]-179 2 [8] b) An electric train is to have acceleration and braking retardation of 0.8 km/hour/sec and 3.2 km/hour/sec respectively. If the ratio of maximum to average speed is 1.3 and time for stops 26 seconds, find schedule speed for a run of 1.5 km. Assume simplified trapezoidal speed-time curve. [8] OR Q10)a) b) Q11)a) b) c) Derive expression for specific energy consumption and factors which affecting energy consumption. [8] An electric train accelerates uniformly from rest to a speed of 50 kmph in 25 seconds it then coasts for 1 minute 10 seconds against a constant resistance of 70N per tonne and is braked to rest at 4 kmphps in 10 seconds. Calculate the schedule speed, if the station stops are of 15 second duration. [8] Compare shunt transition & bridge transition. [6] Discuss suitability of dc series motor for traction system. [6] Two 600V motors are started by series parallel control. Each motor takes 400A during starting time of 20 sec. and has 0.1 resistance [6] calculate i) Energy lost in starting rheostate. ii) Energy lost in motor. iii) Motor O/P. iv) Total energy I/P from line. v) Efficiency of starting. OR Q12)a) b) c) Explain how regenerative braking is used in electric traction. [6] Explain with the energy diagram how the energy is saved with series parallel starting in case of locomotive engine using 4 motors for the operation. [6] What should be essential electric and mechanical feature of traction motors. [6] vvvv [3664]-179 3

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