Shivaji University 2010-7th Sem B.E Electrical Engineering Electrical , (New ) RENEWABLE ENERGY SOURCES - Question Paper
Renewable energy sources is newly introduced subject couple of years ago in Shivaji University, Kolhapur. It's of 100 marks full paper.
IIIIJIIHIH 1-993
Seat ?
I
B.E. (Electrical) (Semester - VII) (New Course) Examination, 2010 RENEWABLE ENERGY SOURCES
Day and Date: Thursday, 2-12-2010 Total Marks : 100
Time : 2.30 p.m. to 5,30 p.m.
Instructions: 1) Attempt any three questions from each Section.
2) Draw? neat sketches wherever necessary.
3) Figure lo right indicates full marks.
SECTION-T
1. a) Write a noie on various sources of renewable energy. 10 b) State the factors driving growth of renewable energy supply. 8
2. a) Derive an expression for power extracted from the wind and explain di Fferent
terms in this expression. 8
b) For a wind speed of 10 m/s at standard atmospheric pressure, calculate power produced by a turbine oflOQ m diameter. The efficiency is 40% and air density is 1.225 Kg/M3. 8
3. a) Write a note on : 8
i) Upwind and downwind wind-turbinc generator system
ii) Vertical and Horizontal axis wind-turbine generator systems.
b) The diameter of wind turbine operating at 5 rpm with efficicncy of 40% is 10 m. The wind speed under standard atmospheric condition is 10 m/s.
Calculate power output of wind turbine in kW and axial thrust in N. 8
4. a) Exp I a i n the worki n g of direc l-c onncc t syn chr o nous mac hi ne u sed for wind
power gene ra ti on. 8
b) ! xp! ain the working of fixed spccd direcl-connect induction generator. 8
P.T.O.
SECTION - II
5. a) Derive time domain model for wind turbine drive-train system. 8 b) Derive [he steady state model of constant speed induction generator. 8
6. a) U sing the s chematic ex pi ai ti the workin g o f doubly-fed in due tion generator. 8 b) Exp 1 am the vari ab 1 e ro tor-resi stance control of wi nd turbine generator. 8
7. a) Explain following terms : 8
i) Voltage flicker
ii) Weak Grid
iii) Stiff Grid
iv) Short-circuit power of grid and short circuit ratio.
b) State the causes of harmonics in wind farm based power system network. 8
8. a) Derive an equivalent electrical circuit and an expression for output current for
PV module. 9
b) Draw and explain i-v andp-v Curves of PV module, 9
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Attachment: |
| Earning: Approval pending. |
