GUJARAT TECHNOLOGICAL UNIVERSITYB.E. Sem-Vth Examination December 2010Subject code: : 150801 Subject Name: Electrical Power Engineering Date: 16 /12 /2010 Time: 03.00 pm – 05.30 pm Total Marks: 70 Instructions:
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Q.1 (a) Draw and explain the schematic arrangement of nuclear power plant. Also explain the functions of:
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| (b) A 1 phase motor connected to 400V,50 Hz supply takes 25A at a p.f. of 0.65lag. Calculate the capacitance required in parallel with motor to raise p.f. to 0.90lag. | 07 |
Q.2 (a) Define tariff and explain in detail:
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| (b) A power station has following daily load cycle:Time(hrs) Â Load(MW)0-6 Â Â Â Â Â Â Â Â Â Â Â Â Â 20
6-10 Â Â Â Â Â Â Â Â Â Â Â 30 10-12 Â Â Â Â Â Â Â Â Â 45 12-16 Â Â Â Â Â Â Â Â Â 60 16-20 Â Â Â Â Â Â Â Â Â 40 20-24Â Â Â Â Â Â Â Â Â 30 Draw load curve .Also calculate:
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OR(b) Calculate volume of conductor material used in
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| Q.3 (a) Explain string efficiency and methods of improving it. Answer Link |
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(b) Explain corona with advantages and disadvantages of it. Also define:
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| ORQ.3 (a) Explain FACTS devices. | 07 |
| (b) Explain different equipments used in substations with its symbols. | 07 |
| Q.4 (a) Define underground cables, draw and explain internal construction of it. | 07 |
| (b) A transmission line has a span of 100m between level supports. The conductor has cross-section area of 5cm2. The tension is the conductor is 2500 kg. If specific gravity of conductor material is 9.98m /cm3 and wind pressure is 1.2 kg/m. Calculate sag and vertical sag. | 07 |
| ORQ.4 (a) A part of transposition cycle of 3phase double circuit line is shown below. Radius of each conductor is 0.9cm.The conductors are made up of solid copper. Find the inductance/phase/km of the line.[image]Â | 07 |
(b) Explain following in respect to medium transmission line.
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Q.5 (a) Draw and explain following distribution schemes:
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| (b) Explain importance of voltage control and method to achieve it. | 07 |
| ORQ.5 (a) Differentiate most economical p.f. and most ideal p.f | 02 |
(b) Explain:
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| (c) A two conductor street mains AB, 500 m in length is fed from both ends at 250 V. Loads 50 A, 60 A,40 A and 30 A are tapped at distance of 100 m, 250 m, 350 m, and 400 m from A respectively. If cross section area of the conductors be 1 cm2 and specific resistance of conductors is 1.7 × 10 -8 Ωm. Determine minimum consumer voltage. | 07 |
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