Biju Patnaik University of Technology 2008-8th Sem B.Tech Renewable Energy Sources and Applications - Question Paper
Total number of printed pages -6 B. Tech
PEMR8407 Eighth Semester Examination - 2008
RENEWABLE ENERGYSOURCES AND APPLICATIONS
Full Marks-70
Time: 3 Hours
Answer Question No. 1 which is compulsory and any five from the rest.
The figures in the right-hand margin indicate marks.
1. Answer the following questions : 2*10
(a) What do you mean by Energy Yield Ratio ?
(b) Write a short note on the common forms of energy.
(c) What is Beam radiation, Diffuse radiation, Air mass and Global radiation ?
(d) What is energy storage and why is it necessary ?
(e) Write a note on variation of wind speed with height.
(f) What are the limitations of Tidal Energy ?
(g) Write a short note on wave devices.
(h) Write about the various applications of fuel cell.
/
i (i) Comment on use of Hydrogen as energy staid,., carrier.
(j) Write a short note on Bio-Diesel.
2. (a) Explain the working of the instruments required for the collection of solar radiation data. 4
(b) Calculate the angle of incidence on a horizontal plane surface at Cuttack at 12:50 Hrs (1st), on March 21, in a leap year. The longitude and latitude of Cuttack are 8554'E and 2028'N respectively. The standard longitude of 1st is 8144'E. 6
The following formula, having their usual connotations, may be used :
360
(i) B = (n-81)
(ii) E = 9.87sin2B-7.53cosB-1.5sinB
(iii) Solar time=Standard time(l_st-L|oc)+E
(iv) = [Solar time - 12.00] hrs * 15
(v) 5 = 23.45 x sin [ (284 + n)]
365
(vi) cosGj = [cos(|).cosp + sin.sinp.cosy], COS8.COS + cos8.sin .sinp.siny + sin8 [sin.cosp - cos.sinp.cosy],
3. On what basis energy storage systems are classified ? Can energy available in one form be stored in another form ? Explain briefly.
10
4. (a) Explain the terms Beanfort scale and wind rose. 4
(b) A HAWT has the following data :
Speed of free wind at a height of 10 m = 14 m/s
Pressure is 1 std atmosphere i.e., 1.01325 x io5 Pa
Ambient temperature is 15C
For air, the gas constant R = 287 J/kgk
a = 0.13
Height of tower = 110 m
Diameter of rotor = 85 m
Downstream wind velocity is 0.45 times that of upstream wind
Find :
(i) Power available in the wind
(ii) Power extracted by the turbine PEMR 8407 4 Contd.
(iii) Axial force on the turbine
(iv) Axial force on the turbine
(a) When maximum power is extracted, and
(b) When the blade stalls completely and no power is extracted. 6
5. (a) Write a note on origin and nature of Tidal
Energy.
4
(b) Derive an expression for Tidal power generation potential with single filling or
emptying of a basin.
6
6. Show that power in waves is directly proportional to the square of amplitude and to the
period of wave for ocean waves.
10
7. Describe the various classifications of fuel cells. 10
8. What are the various Bio-mass conversion technologies presently used ? 10
PEMR 8407 6 -C
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| Earning: Approval pending. |
