Hall Ticket No Question Paper Code: BPE701
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
M.Tech I Semester End Examinations (Regular) February, 2017
Regulation: IARE-R16
RENEWABLE ENERGY SYSTEMS
(Common to
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Define solar radiation and electromagnetic spectrum. Explain how a solar cell works.
Taking a solar power content of 1 W/cm2 at the space-station location, calculate the area of solar
panels required at 20 efficiency of conversion for powers of 2000 MW, 2400 MW, 35000 MW and
70000 MW.
2. Write about reflection and anti-reflection coating.
The reflection coefficients of some semiconductors are: Te 0.28, CdTe 0.19. Calculate the
indices of refraction for them.
UNIT II
3. Write elaborately on Magneto Hydro Dymanic generator, explaining its parts.
An MHD duct has the dimensions, w=0.59m, h=0.34m and l=1.69m (Volume 0.339m3).
The magnetic field strength is B=3.9T along and the gas velocity is u=550/s along l. At
a performance coefficient of K=0.60, calculate:
i. Generated voltage and its gradient E1 inside the duct;
ii. Load voltage and the gradient E caused by it inside the duct.
4. Write in detail types of wind turbines highlighting their classification.
The undisturbed wind speed at a location is vi=35 mile/hr, the speed at turbine rotor is 65%
of this value and the speed at exit is 32% of vi. The rotor diameter is 10m. 1:297kg/m3.
Calculate:
i. vi in m/s.
ii. Power available in undisturbed wind at the turbine rotor
iii. Power in the wind at outlet
iv. Power developed by turbine
v. the value of Cp.
Page 1 of 2
UNIT III
5. What are the generating modes with respect to a tidal project?
A tidal project has installed capacity of 3000MW in 64 units each of 34MW rated output. The
head at rated output is 5.52m. The embankment is 4 miles long 6.4km. Again assume 95%
efficiency for both turbine and generator. The generation is 5 hours twice a day. Calculate
i. The quantity of water flowing through each turbine total flow out of the tidal basin.
ii. The surface area of the reservoir behind the embankment and the wash.
iii. Energy produced in TW-h per year.
6. Write short notes on following types of Open Thermal Energy Conversion Schemes:
i. Closed-Cycle System
ii. Open Cycle System
A tidal power station has 34 generators each of 10 MW operating at a maximum head of 13.5
m. It generates for two 6-hour periods per day. Calculate the basin capacity in m3, and annual
energy production. Again assume 93% efficiencies.
UNIT IV
7. Write about coal gasification with special reference to Lurgi's coal gasification.
What is meant by thermo-chemical gasification and list out gasification steps.
8. Discuss about Global Energy Position.
Write briefly about the pollution-free energy systems.
UNIT V
9. After listing the types of fuel cells write about:
i. Polymer Electrolyte Membrane Fuel Cells (PEMFC)
ii. Direct Methanol Fuel Cells (DMFC)
Explain Hydrogen-Oxygen Fuel cells with the help of a neat and labeled diagram.
10. Write about the various applications of fuel cells with respect to their power.
Discuss Li-ion batteries as a feasible ones for large scale power application and briefly write about
its disadvantages.