Q.1(a) Fill up the blanks with most appropriate word (4.0)
(i) The process of converting biomass into compact agromate is known as
(Pyrolysis, Drying, Briquetting) Briquettiny
(ii) The process of bio-gas production is anaerobic in nature and takes place in Three stages (Two. Three, Four)
(iii) The dome of Janata biogas plant is made of Concrete (Concrete. Iron, PVC)
(iv) is the local name of biogas in rural areas. (Marsh gas, Gobar cas, Wood gas) Go bar yas
(v) In layer of solar pond the salt content is high. (Top, Intermediate. Bottom) bottom
(vi) In zone, the complex structure of biomass begins to breakdown with the release of gases, vapours and liquid. (Pyrolysis. Reduction. Oxidation) Pyrolysis
(vii) The composition of methane in biogas is ( (20-30, 60-65, 80-90) 60-65 viii) Shaft of the rotor of vertical axis wind mill is ( (Horizontal. Vertical, Inclined) Vertical
(b) Explain box type solar cooker with neat sketch. (4.0)
(c) Calculate
(i) Volume of biogas digester suitable for the output of 10 cows (4.0)
(ii) Power available from the digester. Assume retention time 25 days, temperature 30 °C, dry matter produce 2 kg/day, biogas yield 0.24 m² day, burner efficiency 65%. methane proportion 0.75, heat combustion of methane 28 MJ/m³, density of dry matter 50 kg/m³. OR Design a gasifire plant for a farmer having abundant amount of maize stalks for 10 kW diesel pumpset for 6 hrs a day. Assume piled density 50 kg/m³, lower heat value of biomass is 16 MJg and lower calorific of producer gas is 5.5 MJ/m³. Overall efficiency 15% and gasification efficiency -65%. Assume gasification rate