Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCES

324612 (24) B.E. (6th Semester) Examination, Nov.-Dec., 2011Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: Attempt all questions. Part (a) of each question is compulsory. Attempt any two parts out of (b), (c) and (d).UNIT-IQ.1 (a) What are the conventional and unconventional energy sources?2(b) write short notes on:(i) tidal energy(ii) OTEC(c) What is meant by renewable energy source? Explain in brief advantages and limitations of renewable energy source? 7(d) Discuss briefly need. Availability & classification of non-conventional energy sources? 7 UNIT-IIQ.2. (a) what is compound parabolic concentrator? 2(b) what are the advantages and disadvantages of concentrating collectors? 7(c) explain the following terms related with solar power plant: 7(i) Solar insulation power curve.(ii) Thermal power collection curve.(iii) Energy storage (iv) energy supply to load after hours.(d) Draw a schematic of a solar PV electric plant 7UINIT-IIIQ.3. (a) describe the main consideration in selecting a site for wind generators. 2(b) what are the advantages of vertical axis machine over horizontal type? What methods are used to overcome the fluctuating power generation of wind mill? 7(c) describe with a neat sketch the working of wind energy system with main components. 7(i) the total power density in the wind stream.(ii) the maximum obtained power density.(iii) A reasonably obtainable power density(iv) the total power, and(v) the torque and axial thrust.Given:Turbine dia =120m, operating speed = 40 rpm at maximum efficiency.UNIT-IVQ.4. (a) what is difference between biomass and biogas. 2(b) How are biogas plants classified? Explain them briefly. 7(c) The observed difference between the high and low water tide is 8.5 m. for a proposed tidal side. The basin area is about 5. Sq km which can generate power for 3 hours in each cycle. The average available head is assumed to be 8 m. and the overall efficiency of the generation to be 70%calculate the power in H.P at any instant and the yearly power output. Average specific weight of sea water is assumed to be 1025kg/m2 7(d) Classify geothermal source and what are the main application of geothermal energy? 7UNIT-VQ.5. (a) what are the various losses associated with operation of MHD generator? 2(b) With the following specification for an MHD generator, calculate the open circuit voltage and maximum power output.7Plate area = 25m2Distance between plates =50 mFlux density = 2wb/m2Average gas velocity = 103 m/secondGaseous conductivity = 10 Mho/m(c) How MHD system are classified? And what are important factors to be considered while selecting material for an MHD generators. 7(d) describe the principle of working and constructional details of a basic thermionic generator. 7

324612 (24) B.E. (6th Semester) Examination, April-May., 2011Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: (i) Part (a) of each question is compulsory.(ii)Attempt any two parts out of (b),(c) & (d) of each question .Q.1.(a) What are primary and secondary energy sources ?(b) What are the conventional and non-conventional sources of energy? Describe in brief.(c) Discuss the possibilities of utilization of the following methods of power generation:(i) Wind energy(ii) Fuel cells(iii) Tidal energy(d) What is meant by renewable energy sources with special reference to India context.Q.2. (a) What is solar constant?(b) Describe solar pond electric power generation with neat block diagram .(c) Write short notes on:(i) Solar altitude angle(ii) Incident angle(iii) Collector efficiency.(d) Classify the methods of solar energy storage. Describe the thermal energy storage system.Q.3. (a) What is the basic principal of wind energy conversion?(b) Describe, with neat block diagram, the working of wind energy system (WECS) with main components.(c) What are the advantages of vertical axis machine over horizontal axis machine?(d) Describe the main applications of wind energy, giving neat sketches.

Q.4. (a) Classify geo-thermal sources.(b) Explain the constructional detail and working of KVTC digesters.(c) How are gassifiers classified? What are pyrolysis?(d) Describe the closed cycles of OETC system with advantages over open cycle system.Q.5.(a) What is the principal of MHD generation ?(b) Describe MHD closed cycle system with its advantages over MHD open cycle system.(c) What are the important factors to be considered while selecting materials for MHD generator. Also give the name of materials for electrodes and generator ducts.(d) Explain in brief, the following:(i) Potential barrier(ii) Thermoionic emission.(iii) Work function.

324612 (24) B.E. (6th Semester) Examination, Nov-Dec. 2010Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: part a of each question is compulsory and solve Q.1. (a) What is meant by renewable energy sources ? 2

(b) What are the prospects of non-conventional energy sources in India. 7

(c) Justify the use of following sources of energy in Indian context. 4+ 3(i) Agricultural residues. (ii) Tidel energy

(d) Write a short note on Energy storage and Distribution. 7

Q. 2. (a) Define solar constant. 2

(b) What are the main components of a flat-plate collector, explain The function of each component. 7

(c) Determine the local solar time and declination at location Latitude 2315N, longitude 7730E at 12.30 IST on June 19. Equation of time correction is given from standard table= -(101) 7

(d) Explain any two: 7

(i)Solar water heater(ii)Solar power tower(iii)Solar water pumpQ.3. (a) Why does the air circulate in the atmosphere. 2

(b) What are the advantage of vertical axis machines over horizontal type ? Describe a rotor low velocity wind.7

(c) Discuss the adventages and disadventages of wind energy Conversion system ? 7

(d) Describe with a next sketch, the working of a wind energy system (WECS) with main components . 7

Q.4. (a) What do you mean by tidal range ? 2

(b) Give the adventages and limitations of Tidal power Generation.What are the propects of Tidal Energy in india. 7

(c) State adventages and disadventages of Geothermal Enregy over other Energy froms.What are theapplication of Geo- Thermal Energy at different temperatures.7

(d) Explain the function of fuel cells alongwith adventages & disadventages. 7

Q.5. (a) What replaces solid conductor in an MHD Generation.2

(b) Decribe an MHD closed cycle system,with its adventages and disadventages. 7

(c) Describe the principal of working and constructional detail of a basic Thermionic generator. 7

(d) What are the different methods for hydrogen production? Explain in brief. 7

324612 (24) B.E. (6th Semester) Examination, April May 2010Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note : In each question part (a) is compulsory and solve any two partsFrom part (b) ,(c) , & (d) in each question . assume suitable data If required .

Q.1(a) Importance of non conventional energy. 2 (b) Classify various non conventional energy Sources and give a table to show the availability of Various energies . 7 (c) With the help of table and suitable data give relative Merits and demerits of various non conventional Sources of energy . 7

(d) Describe the energy strage, its distribution and conservation. 7

Q.2. (a ) What are limitations of solar cells. 2

(b) Describe solar cell power plants with the help Of block diagrams . 7

(c) What are solar energy collectors ? Draw diagram of Various collectors . Enlist the applications . 7

(d) What are the different types of solar cells Explan its Performance characteristics efficiency and losses.7

Q.3. (a) Wind energy is called as green energy. Why ? 2

(b) Draw a neat sketch of a wind turbine generator set (horizontal Axis type) and label various important parts . Give their function in one line each . 7 (c) Define following terms related to wind from : 7

(i)Cut in velocity(ii)Cut out velocity(iii)Load curve(iv)Availability factor(d) Enlist advantages and limitations of wind power Generating system. 7

Q.4. (a) Limitations of tidal energy . 2 (b) Draw a neat diagram for the Dolphin type water Generator and explain its working . 7 (c) Explain the working of a bio-mass gasifier with the Help of block diagram and associated chemical Reactions . 7 (d) With the help of suitable diagram expain the working of Binary cycle geo thermal power plant . 7

Q.5. (a) Meaning of M.H.D. and its potential in india. 2 (b) What are the design problem in MHD power Generation. 7

(c) Explain working of closed cycle MHD power Generation system . 7

(d) What are the advantages and limitations of MHD power Generation . 7

324612 (24) B.E. (6th Semester) Examination, Nov.-Dec., 2009Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: Part-(a) of each question is compulsory . Attempt any two parts from (b) (c) and (d) of each question. Numerical should be solved with all intermediate step clearly. Unit IQ.1.(a) What are the conventional and non conventional energy sources ?(b) What is meant by renewable energy sources ? Give advantage and limitations of renewable energy sources.(c) Describe electromagnetic energy storage.(d) What are the methods of direct energy conversion ? Describe in brief Unit IIQ.2.(a) brief Why orientation is needed in concentrating type collectors ?(b) What are the advantages and disadvantages of concentrating collectors over a flat-plant collectors ?(c) What are the different approaches of thermal electric conversion system for solar energy ?(d) What is the principal of solar photovoltaic power generation ? What are the advantages and disadvantage of photovoltaic solar energy conversion ? Unit IIIQ.3.(a) Describe the main consideration in selscting a site for wind generators .(b) Discuss the advantages and disadvantages of horizontal and vertical axis windmill What methods are used to overcome the fluting power generation of windmill?(c) Prove that in case of horizontal axis with turbine. Maximum power can be obtained when.Exit velocity = wind velocity and

(d) Discuss the advantage and disadvantages of wind energy conversion system. Unit IVQ.4.(a) What is the difference between biomass and biogas ?(b) What are the main application advantages and disadvantages of geothermal energy forms?(c) Write short notes on the following:(i) Open cycle MHD system(ii) Closed cycle MHD system(d)Calculate the open-ckt voltage and maximum power output of MHD engine with following specifications :Plate area =0.2 Distance between plantes =0.4mFlux density =2 wb/Average gas velocity =1000m/secConductivity of the gas =10mho/m324612 (24) B.E. (6th Semester) Examination, April-May., 2009Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: Part-(a) of each unit is compulsory . Attempt any two parts from (b) (c) and (d) of each unit.

Q.1(a) Enlist the various categories on the basis of which energy sources are classified.2(b)write the merits and demerits of the following type of non-conventional energy sources:(i)Solar Energy(ii)Biomass Energy(iii)Geothermal Energy(c)Explain the various methods of mechanical energy strrage.7(d)What are the advantages and limitations of renewable energy sources ?7Q.2(a)Draw the V-I characteristics of a solar cell. 2(b) What are the advantages and disadvantages of concentrating collectors over flat plant type collectors.7(c) Explain the following application of solar energy along with proper diagram.7(d) Explain the working principal of a solar cell with proper diagram.7Q.3(a) What is Betz limit of a wind turbine ?2(b) A propeller type wind turbine has a diameter of arm And operates at 40 r.p.m. at maximum efficiency and at 1 standard atmospheric pressure velocity of 15m/s. Calculate: 7(i)the total power density in the wind stream(ii)the maximum obtainable power density(iii)the obtainable power density at an efficiency of 35%(iv)the total power(v)the torque at maximum efficiency and the maximum axial thurst.(c) Explain the Darrieus rotor wind energy system along with its advantages and disadvantages.7(d)Derive expressions for maximum power, torque and exial thurst of a wind turbine.7Q.4(a) Enlist the main components of a tidal power plant.2(b)Explain the factors affecting biodigestion or generation of gas in a biogas plant. 7(c)Explain the general categories of geothermal resources in brief.7Plate area =0.25; Distance between plants =0.5m, Flux density =2 wb/; Av. Gas velocity = m/sec, Gaseous conductivity = 10 mho/m.(d) Write short notes on :7(i)Seebeck Thermo-electric effect(ii)Uses of hydrogen as a source of energy(e) Explain with a diagram the process of electrolytic production of hybrogen.7324612 (24) B.E. (6th Semester) Examination, Nov-Dec., 2008Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: Attempt all questions. Part (a) of each question is compulsory. Answer any two of the remain three parts (b),(c) and (d) of each question,Q.1(a) Define renewable energy resources and name them.2(b)What are the advantages and limitations of non conventional energy sources ?7 (c) Explain giving an example how the stored energy can be used during peak demand hours. 7(d)Write short note on:(i)Biomass & Biogas(ii) Geo-thermal energyQ.2(a) Name the methods of utilization of solar energy .2(b) Explain with a sketch the working of a photovoltaic cell. 7(c) What are the main components of a flat plate solar collector? Explain the function of each.7(d) Describe in brief the various energy strage methods used in the solar system. 7Q.3 (a) What are the factor which determine the output from wind energy converter ?2(b) Derive an expression for the power generated by wind indicating various parameters. 7(c) Wind at 1 standard atmospheric pressure & temp. 15 C has a velocity of 15 m/sec. Turbine dia =120m, Turbine operating speed =40rpm, Air density=1.226 kg/, Efficiency =35% at maximum efficiency Calculate :7(i) Total power density in the wind strem(ii)Maximum obtainable power density(iii)Total power in kW.(d) Explain with a diagram the working of wind electric system and functions of various components. 7Q.5(a) What are the materials used in MHD generating system 2(b)Calculate the open circuit voltage and maximum power output in an MHD generator with following specifications :7

324612 (24) B.E. (6th Semester) Examination, April-May., 2008Branch: Electrical, EEENON CONVENTIONAL ENERGY SOURCESTime allowed: Three hoursMaximum Marks: 80 Minimum Marks: 28

Note: Attempt all questions. Part (a) of each question is compulsory.Attempt any two parts out of (b),(c) and (d).Q.1.(a) What is an energy system ? Explain in brief.2(b) Write the merits and demerits of the following types of non-conventional energy sources :7(i) Tidal energy(ii)MHD(iii)Bio energy(c)Which type of non-conventional energy source is the best suitable for rural and agricultural application and why? Explain in detail.7(d) The non-conventional methods were known to man since time immemorial , still they were not developed comment and give reasons.7Q.2.(a)What are the limitation of PV systems ?(b)Calculate F.F. maximum power and cell efficiency with the following parameters.=0.24V, =-10 mA, =0.14=-6.5 mA, Intensity =100 w/, Area =4 . 7(c)What are Solar Concentrators ? Describe various components of solar concentrator and discuss its advantages:7(d)Describe with a neat diagram, the construction and principal of operation of a flat solar energy collector. 7Q.3(a) What is baise principal ofwind energy convertion ?2(b)Explain the working of horizontal axis tero blade windmill with suitable diagram .7(c)What methods are used to overcome the fluctuating power generation of a windmill? Discuss their merits and demerit.7(d) Explain the momentum theory in wind power generation. Give the classification by rotor used for wind generation. 7Q.4(a) What is Biomass? How it is useful?2(b)How Bio-energy may be useful for rural application? Justify your answer.7(c)Explain the various methods of tidal power generation. What are the limitations of each method ?7(d) A tidal power plant of single basin type has a basin area of 25 .The tide has arrange of 10m. The turbine however stop operation when the head an it falls below 2m. Calculate the energy generaled m ate filling process, in kwh if the turbine generator effication is 75% (Density of sea-water =1025 kg/)7Q.5(a) What is Magneto-hydro-dynamic generator ?2(b)Draw Schematic diagram of a MHD generating system having heart recovery steam generator .Explain the functioning of the system.7(c)Explain the single baise arrangement and its operation for a tidal power plant.7Q.6 (a)What is meant by thermionic generation?2(b)Explain the electrolytic production of hydrogen with proper diagram.7(c)Explain the operation of a closed cycle MHD system.7(d)What is meant by figure of merit, Z, in thermo electric conversion ?For a thermoelectric power generate following parameters are given:Temperature of hot reservoir of source =600KTemperature of sink =300KFigure of merit for material Z =(2)Determine the efficiency of the thermoelectric generation.What will be its Carnot efficiency.