Q.1
How are systems intended for the digestions are filled and emptied?
  • a) Manually
  • b) By evaporation
  • c) By pumps and pipes
  • d) By channels and pits
Q.2
Cow manure is rich in __________
  • a) Hydrogen
  • b) Phosphorus
  • c) Nitrogen
  • d) Potassium
Q.3
How many weeks does complete digestion of cow manure takes about?
  • a) 1
  • b) 2
  • c) 4
  • d) 8
Q.4
How many weeks does a batch digester need to produce biogas?
  • a) 1 week
  • b) 2 – 4 week
  • c) 12 week
  • d) 4 – 8 week
Q.5
Which of the following matter has a much higher carbon – nitrogen ratio?
  • a) Vegetable matter
  • b) Cow dung
  • c) Plant waste
  • d) Organic waste from industry
Q.6
Which of the following waste produces more gases comparatively?
  • a) Vegetable matter
  • b) Cow dung
  • c) Plant waste
  • d) Organic waste from industry
Q.7
How much thick layer of insulation is done inside of digester?
  • a) 10 cm
  • b) 15 – 25 mm
  • c) 8 mm
  • d) 50 – 100 cm
Q.8
What happens if the organic matter is not stirred while in process of digestion?
  • a) It will evaporate
  • b) It solidifies
  • c) It will form hard scum on layer
  • d) It gets struck to digester walls
Q.9
How is biogas from an anaerobic digester collected?
  • a) In a compressor
  • b) In the pipelines
  • c) In inverted drum
  • d) In a storage tank
Q.10
Which type of valve is used to prevent air being drawn into the digester?
  • a) Non return valve
  • b) Poppet vale
  • c) Return valve
  • d) Check valve
Q.11
Which types of plants are filled and then emptied completely after fixed retention time?
  • a) Batch plants
  • b) Continuous plants
  • c) Floating gas holder plants
  • d) Flexible bag biogas plant
Q.12
What is the major disadvantage of batch plants?
  • a) Their output is not steady
  • b) Comes to frequent breakdown
  • c) They are not efficient
  • d) They are very costly
Q.13
Which among the following best suitable treatment of waste products?
  • a) Aerobic fermentation
  • b) Anaerobic fermentation
  • c) Autolysis
  • d) Thermal reaction
Q.14
What does PSD stand for?
  • a) Post source decay
  • b) Particle size distribution
  • c) Polystyrene deuterated
  • d) Post synaptic density
Q.15
Which is the third stage of anaerobic digestion?
  • a) Acetogenesis
  • b) Methanogenesis
  • c) Acidogenesis
  • d) Hydrolysis
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