Question 21 : Choose the general formula of carbohydrates?
1. [C₂H₂O₂]_n
2. [CHO]_n
3. [CH₂O]_n
4. [C₂O₂]_n
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Question 22 : Which of the following two are most important nutrients?
1. Carbon and nitrogen
2. Methane and carbon
3. Methane and oxygen
4. Methane and nitrogen
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Question 23 : How is biogas from an anaerobic digester collected?
1. In a compressor
2. In the pipelines
3. In inverted drum
4. In a storage tank
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Question 24 : What should be the ratio of raw material to water?
1. 1:1
2. 4:1
3. 5:2
4. 3:6
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Question 25 : Which is the gasifier that can be operated in small scale/amounts?
1. Counter current gasifier
2. Cross draught gasifier
3. Co-current gasifier
4. Fluidized bed gasifier
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Question 26 : The process by which plants, some bacteria and some protistans use the energy from sunlight to produce sugar?
1. Taxonomy
2. Metabolism
3. Photosynthesis
4. Osmosis
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Question 27 : Product of anaerobic decomposition involves ___________
1. Methane
2. Lactic acid
3. Oxygen
4. Alcohol
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Question 28 : Which is the initial issue of the biogas plant?
1. Feedstock
2. Contaminants
3. Moisture contents
4. Nutrients
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Question 29 : What is BTU used to measure?
1. Heat content
2. Area
3. Density
4. Volume
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Question 30 : In what PH range does anaerobic digestion occurs at best?
1. 6.8 - 8.0
2. 0 – 5.0
3. 2.3 - 4.5
4. 3.5 – 7.2
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