JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV WIND, SOLAR AND HYBRID ENERGY SYSTEMS Previous Question Paper (September - 2022 - R16)
Answer any Five Questions
All Questions Carry Equal Marks
Main
Compare the energy at 25°C, 1 atm pressure, contained in 3m2 of the following wind regimes:
120 hours of 6-m/s winds
Answer
The energy contained in a wind regime is calculated using the power density formula multiplied by time. The power available in the wind is given by the expression:
Given air density at 25°C and 1 atm (ρ) is approximately 1.184 kg/m3, area (A) = 3 m2, velocity (v) = 6 m/s, and time (t) = 120 hours:
Total energy (E) = P × t = 640.512 W × 120 h = 76,861.44 Wh or 76.86 kWh.
60 hours at 4 m/s plus 60 hours at 8 m/s.
Answer
For the second regime, the total energy is the sum of energy from the two distinct wind speed intervals:
1. For 60 hours at 4 m/s:
2. For 60 hours at 8 m/s:
Total energy (E) = E1 + E2 = 11,366.4 Wh + 90,931.2 Wh = 102,297.6 Wh or 102.30 kWh.
Explain:
Betz limit ratio
Answer
Sign in to view the complete answer paper.
Stall and pitch control.
Answer
Sign in to view the complete answer paper.
Explain the basic system for a wind turbine with a permanent magnet synchronous generator along with a neat diagram.
Answer
Sign in to view the complete answer paper.
Explain the working of fixed and variable speed wind turbine.
Answer
Sign in to view the complete answer paper.
Explain the characteristics of doubly fed Induction Generator.
Answer
Sign in to view the complete answer paper.
Find the altitude angle and azimuth angle for the sun at 3:00 P.M. solar time to latitude 40° on the summer solstice.
Answer
Sign in to view the complete answer paper.
What is solar day length? Explain the procedure of estimation of solar energy availability.
Answer
Sign in to view the complete answer paper.
Explain different power electronic converters used for solar systems.
Answer
Sign in to view the complete answer paper.
What is solar thermal power generation? Explain in detail about the Solar Pond.
Answer
Sign in to view the complete answer paper.
List and explain the problems that are encountered with Power System Interconnection of networks.
Answer
Sign in to view the complete answer paper.