Name of the College : Mahatma Gandhi University
Department : Electrical and Electronics Engineering
Subject Code/Name : MEEES 102/Non Conventional Energy Sources
Sem : I
Website : mgu.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper :
I : https://www.pdfquestion.in/uploads/mgu.ac.in/5044-1-MEEES%20102%20NCES%20QP%201.doc
II : https://www.pdfquestion.in/uploads/mgu.ac.in/5044-2-MEEES%20102%20NCES%20QP%202.doc
Non Conventional Energy Sources Question Paper :
M.TECH. Degree Examination :
Model Question Paper – I
First Semester
Related : MGU Advanced Power Semiconductor Devices M.Tech Model Question Paper : www.pdfquestion.in/5048.html
Branch: Electrical and Electronics Engineering
Specialization: Energy Systems
MEEES 102 : Non – Conventional Energy Sources
(Regular/Supplementary – 2013 Admission Onwards)
Time: Three Hours
Maximum: 100 Marks
Answer four full questions. :
1. a) Consider the Sun and Earth to be equivalent to two spheres in space. From the data given below, calculate approximately the solar constant outside the Earth’s atmosphere.
Diameter of the Sun 2RS = 1.392×109 m
Diameter of the Earth 2RE = 1.278×107 m
Sun – Earth distance L = 1.498×1011 m
Sun’s equivalent black body temperature = 5780K (7 Marks)
b) Draw and explain the block diagram of a PV system (5 Marks)
c) The dark current density for a silicon solar cell at 40oC is 3.6×10-8 A/m2 and the short circuit current density is 220 A/m2.
Calculate the voltage and current density that maximizes the power of the cell. What would be the corresponding maximum power output per unit cell area and the corresponding conversion efficiency if global solar radiation incident on the cell is 850 W/m2 ? Calculate the cell area required for an output of 36 W. (5 Marks)
d) Calculate the number of daylight hours (day length) at Bangalore on 21 June and 21 December in a leap year. The latitude of Bangalore is 12o58’ N. (8 Marks)
OR
2. a) Calculate the angle of incidence of beam radiation on a flat plate collector for the following situation:
Location : Nagpur (21o06’ N, 79o03’ E)
Slope of collector : 31o
Surface azimuth angle : 15o
Date : October 1, 1988
Time : 1500 h (IST) (9 Marks)
b) Draw and explain the equivalent circuit of a solar cell (5 Marks)
c) Define Air Mass (AM) (3 Marks)
d) Calculate the monthly average of the daily global radiation on the horizontal surface at Gulmarg (34.05o N, 74.38o E) , during the month of October if the average sunshine hour per day is 5 hours. (8 Marks)
3. a) Derive the expression for power developed due to wind. (6 Marks)
b) What are the advantages of horizontal axis wind turbine over vertical axis wind turbine? (5 Marks)
c) Design the rotor radius for a multi blade wind turbine that operates in a wind speed of 3kmph to pump water at a rate of 6 m3/h with a lift of 10 m. Also calculate the angular velocity of the rotor.
Given water density = 1000 kg/m3, g = 9.8 m/s, water pump efficiency = 50 % , efficiency of rotor to pump = 80 %, Cp = 0.3and air density = 1.2 kg/m3 (9 Marks)
d) Define specific speed . Find the specific speed when 150 kW power is to be generated under a head of 100 m at 300 rpm. Also, suggest the type of turbine to be used based on specific speed. (5 Marks)
OR
4. a) Derive the relation between exit velocity and wind velocity for maximum power extraction for a horizontal axis wind turbine (6 Marks)
b) Discuss the different types of wind turbines used to extract wind energy. (6 Marks)
c) A WECS has a rotor of 15 m diameter. Measurements at 6 m/s show that the rotor turns at 60 rpm and that the torque on the axis is 250 Nm.
Determine the tip speed ratio at which the rotor is turning; also determine the power coefficient and the torque coefficient. How many blades do you expect the rotor will have approximately? (10 Marks)
d) What types of electric generators are used in small hydro power projects? (3 Marks)
5. a) Write about three major factors affecting Wave energy (4 Marks)
b) A 100 MW vapor-dominated system uses saturated steam from well with a shut-off pressure of 28 bar. Steam ethers the turbine at 5.5 bar and condenses at 0.15 bar.
The turbine polytrophic efficiency is 0.82 and the turbine-generator combined mechanical efficiency is 0.9. The cooling tower exist is at 20oC. Calculate the necessary stem flow, the cooling water flow and the plant efficiency and heat rate if reinjection occurs prior to cooling tower. (15 Marks)
c) Write three important components of a tidal power plant. (6 Marks)
OR
6. a) Describe with the help of a simple schematic diagram the process of an ocean thermal energy conversion based on steam cycle (10 Marks)
b) Write the advantages and disadvantages of tidal power plant (5 Marks)
c) Write short note about different types of wave energy conversion devices. (10 Marks)
7. a) Discuss the state-of-the-art conversion technologies that help to use biomass material efficiently. (10 Marks)
b) Why hydrogen called a secondary energy source? Name the various methods of hydrogen production (6 Marks)
c) Give a complete description about utilization of hydrogen gas. (9 Marks)
OR
8. a) Why the energy content of the producer gas is lower than the energy content of the biogas? (6 Marks)
b) Comment on environmental effects of fuel cell (5 Marks)
c) Comment on the safety issue related to the use of hydrogen. (5 Marks)
d) Discuss various conversion technologies of hydrogen to useful applications (9 Marks)