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electrical and electronics (Jawaharlal Nehru Technological University, Anantapur)
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Code: 13A02702 R13
B.Tech IV Year I Semester (R13) Supplementary Examinations June 2017
UTILIZATION OF ELECTRICAL ENERGY
(Electrical and Electronics Engineering)
Time: 3 hours Max. Marks: 70
PART – A
(Compulsory Question)
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1 Answer the following: (10 X 02 = 20 Marks)
(a) Define: (i) Luminous flux. (ii) Luminous intensity.
(b) Draw the circuit diagram of fluorescent lamp with glow type starter.
(c) Write any two advantages of electrical heating.
(d) Mention the applications of electrolysis.
(e) Give the comparison between AC & DC traction.
(f) List the advantages of electrical drive used on traction.
(g) What are the different types of train services?
(h) Define tractive effort.
(i) What is load factor? On what factors it depends?
(j) Discuss about pit head generation.
PART – B
(Answer all five units, 5 X 10 = 50 Marks)
UNIT – I
2 (a) State and explain laws of illumination.
(b) If a lamp of 75 W, emitting 950 lumens is placed in a frosted globe of 30 cm diameter and gives uniform
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brightness of 250 mililamberts in all directions, calculate candle power of globe & percentage of light
absorbed by the globe.
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3 (a) Explain in detail about the good lighting scheme.
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(b) In a street light scheme, lamps having uniform candle power of 500 are hung at a height of 6 meters. The
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distance between consecutive lamp posts is 8 meters. Find the illumination under lamp at center in
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between lamp posts.
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UNIT – II
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4 Explain about induction heating in detail.
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5 (a) What are different types of welding methods? Explain briefly.
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(b) Discuss about Faraday’s laws of electrolysis.
UNIT – III
6 Explain the various systems of traction in detail.
OR
7 Explain the different methods of electrical braking.
UNIT – IV
8 (a) What is speed-time curve? Explain in detail.
(b) What is coefficient of adhesion? Also discuss the factors affecting coefficient of adhesion.
OR
9 (a) What are the various factors affecting specific energy consumption?
(b) A train runs with average speed of 40 kmph, distance between stations is 2 km. The values of
acceleration and retardation are 1.5 kmphps & 2.5 kmphps respectively. Find the maximum speed of the
train assuming trapezoidal speed time curve.
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Code: 13A02702 R13
UNIT – V
10 (a) Explain the various methods for improvement of power factor.
(b) A 37 kW motor is required to drive a pump which has to be in operation on full load for 3000 hours per
year. Two motors of similar reliability and maintenance requirements are available, viz:
Motor A: Cost Rs. 1440, efficiency : 88%
Motor B: Cost Rs. 1920, efficiency : 89%
The unit cost of energy is 6 paise per kWh and interest and depreciation may be taken as 10% per year.
Which motor will give the lower yearly cost?
OR
11 (a) State various reasons for the choice of private generation over the public supply.
(b) A consumer requires 10,00,000 units per year and the yearly load factor is 30%. The tariff in force is
Rs.120 per kW per year plus 5 paise per unit. Estimate the savings in energy costs, which would result if
the load factor is improved to 100%.
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