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Cow-dung and water are mixed in equal proportions in the mixing tank M to prepare the slurry. It takes about 50 to 60 days for the new gas-plant to become operative (start functioning).The spent dung-slurry, left after the extraction of biogas, is rich in nitrogen and phosphorus compounds and hence forms a good manure.1. Slurry is a mixture of cow dung and water.a. TRUEb. FALSE2. Mixture of cow dung and water in equal proportions prepare ..........a. Mudb. Slurryc. Cow dung cakesd. None of these4. A new biogas plant becomes operative in ............ days.a. 30 - 40b. 40 - 50c. 50 - 60d. 60 - 704. The spent dung-slurry left after the extraction of biogas in rich ina. Nitrogen and phosphorusb. Oxygen and calciumc. Sulphur and calciumd. Hydrogen and nitrogen5. Mostly we use ............ in biogas plants.a. Human excretab. Cow dungc. Plant wasted. None of these |
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Answer» 1. a. TRUE 2. b. Slurry 3. c. 50 - 60 4. a. Nitrogen and phosphorus 5. b. Cow dung |
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