Modelexam

• About 40% of the worlds population today rely on traditional biomass for cooking, and biomass represents more than 60% of the renewable energy consumption in the EU
• In anaerobic digestion application, pH is a perimeter directly correlated to

  Microbes
• Anaerobic digestion steps

  1 hydrolysis

  2 acidgenesis

  3 acetogenesis

  3 methanogenesis
• Among the different gasifier types

  entrained flow gasifier is suitable to produce the largest power
• Among the different substrate types fat has the highest biogas potential
• Fixed dome type reactor - used for domestic purposes

  small bottle batch type reactors- used to biomethane potential test

  UASB reactor - used in waste water, treatment application
• Which two applications broadly categorize Biogas upgrading

  in situ, ex sintu
• High moisture content biomass- produces low amount of bio fuel

  Low moisture content biomass -produces high amount of bio fuel

  Oven drying moisture test - 150°c

  Ratio between dry and raw biomass - used for calculating moisture content
• Sugar based feed stock - sorghum

  starch based feedstock - cassava

  lignocellulose based feedstock- logging residues

  lipid-based feed stock - canola
• Which input air level to a reactor, describes combustion?

  excess Air input
• The presence of which element can lead to the increase of biomass ash melting temperature

  mg
• Downstream flue gas after combustion can be cleaned by particles using cyclone
• Compared to gasoline based ethanol, which renewable source-based ethanol reduces more GHG emissions

  cellulosic ethanol
• Which two producer gas components unnecessary for the fisher-trposh synthesis to bio diesel production

  CO And H2
• Which following efficiency term is not relevant to the performance of gasification

  syngas efficiency
• Among the different gas components present in the producer gas the energy content of hydrogen is the largest
• 100 to 150° - drying

  200 to 500° - pryolysis

  800 to 1200°- combustion

  650 to 900° - reduction
• Photosynthesis is a process where chlorophyl molecules gain electrons via water splitting caused by Mn
• What separates the primary wall from the secondary wall in the plant cell?

  The middle lamella
• The major issues related to hydroelectric projects are environmental concerns caused by damming and large capital investment
• Microbial fuel cell operation, depends on the type of microbes used
• exajoule = 10^18 joule
• Ethanol is a fuel that consist of 35%

  oxygen