Tar is removed by choosing the appropriate catalyst.
1.True
2.False
Which of the following is a component of tar?
1.Sodium
2.Benzene
3.Chlorine
4. Nickel
Acidogenesis further break down the molecules received from hydrolysis in anaerobic digestion.
1.True
2.False
Anaerobic fermentation is how many staged process?
1.Single stage
2.Two – stage
3. 3-stage
4.4 – stage
Below which temperature the action off digesting bacteria decreases?
1.16oC
2.35oC
3.28oC
4.0oC
Bio-oil has double the heating value of conventional fuel oil.
1.True
2.False
Gases emitted from the digester indicates the amount of biomass left to be broken down.
1.True
2.False
How is the temperature maintained in a bubbling fluidized bed?
1.Biomass
2.Gasification agent
3.A constant ratio of biomass and gasification agent
4.Manipulating the ratio of biomass and gasification agent
How many types of basic organic decomposition occur in Biomass energy conversion?
1.2
2.3
3.4
4.5
How much percentage of solid content is present in anaerobic digestion?
1.8%
2.2%
3.32%
4.50%
Hydrothermal liquefaction produces _________
1.syngas
2.bio-crude
3.bio-oil
4.producer gas
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
Methanogens can directly use the products of hydrolysis to produce methane.
1.False
2.True
Product of anaerobic decomposition involves ___________
1.Methane
2.Lactic acid
3.Oxygen
4.Alcohol
Solid remnants of the original input material to the digesters are called ________
1.Ordure
2.Egests
3.Digestate
4.Manure
The central part of an anaerobic plant in an enclosed tank is known as ____________
1.Pit
2.Digester
3.Mixer
4.Feeder
The two separate fluidized beds in a dual fluidized bed gasifier are used for pyrolysis and combustion process.
1.True
2.False
Thermo-chemical processes have higher efficiencies than bio-chemical processes.
1.True
2.False
Too nitrogen will cause ____________
1.Poisonous gases
2.Reduction in fertility of mixture
3.Reduction in quantity of mixture
4.Mixture to harden
What are the three methods of pre-treatment of influent for anaerobic digestion?
1.Galvanization, pyrolysis and pre-heating
2.Mechanical treatment, pre-heating and thermal treatment
3.Galvanization, pyrolysis and thermal treatment
4.Pyrolysis, thermal treatment and pre-heating
What are the three types of fluidized gasifiers used?
1.Single fluidized bed, dual fluidized bed and bubbling fluidized bed
2.Straight fluidized bed, dual fluidized bed and bubbling fluidized bed
3.Circulating fluidized bed, dual fluidized bed and bubbling fluidized bed
4.Single fluidized bed, dual fluidized bed and straight fluidized bed
What are the three types of hydrothermal processing of biomass?
1.Hydrothermal liquefaction, hydrothermal gasification and ablate pyrolysis
2.Hydrothermal liquefaction, hydrothermal gasification and fast pyrolysis
3.Hydrothermal liquefaction, hydrothermal gasification and hydrothermal carbonisation
4.Intermediate pyrolysis, hydrothermal gasification and ablate pyrolysis
What are the two main products of anaerobic digestion?
1.Carbon monoxide and hydrogen
2.Methane and carbon dioxide
3.Methane and carbon monoxide
4.Hydrogen and carbon dioxide
What are the two main units in a circulating fluidized bed?
1.Bubbling fluidized bed and dual fluidized bed
2.Bubbling fluidized bed and gasifier unit
3.Circulating unit and gasifier unit
4.Circulating unit and dual fluidized bed
What are the two types of entrained flow gasifiers?
1.Bubbling fluidized gasifier and dual fluidized gasifier
2.Bubbling fluidized gasifier and top-fed gasifier
3.Top-fed gasifier and side-fed gasifier
4.Side-fed gasifier and dual fluidized gasifier
What are the two ways to produce methane in methanogenesis step?
1.Converting carbon monoxide and carbon dioxide into methane
2.Converting carbon monoxide and acetic acid (or acetate) into methane
3.Converting methane into carbon monoxide and carbon dioxide
4.Converting carbon dioxide and acetic acid (or acetate) into methane
What ensures consistency of temperature in fluidized gasifier?
1.Gasification agent
2.Air-fluidized bed material
3.Biomass
4.Air non-permeable bed material
What is ADP stand for?
1.Adenosine terra phosphate
2.NADPH
3.Adenosine pyrophosphate
4.Adenosine tri-phosphate
What is the biomass decomposed to in a bubbly fluidized bed?
1.Producer gas
2.Char and gas products with a low tar percentage
3.Char and gas products with a high tar percentage
4.Char with a low tar percentage
What is the temperature range in a bubbling fluidized bed?
1.Between 700 and 900 degree Celsius
2.Less than 500 degree Celsius
3.Above 1000 degree Celsius
4.Between 100 and 200 degree Celsius
What is unique about the gasification agent entering in a fluidized gasifier?
1.Enters from bottom at a relatively fast rate as compared to a fixed bed gasifier
2.Enters from bottom at a relatively slow rate as compared to a fixed bed gasifier
3.Enters from top at a relatively fast rate as compared to a fixed bed gasifier
4.Enters from top at a relatively slow rate as compared to a fixed bed gasifier
Where can the ash and hot gas be separated in a circulating fluidized bed gasifier?
1.Gasifier unit
2.Circulation unit
3.Tornado separator
4.Cyclone separator
Which amount is the ideal carbon-nitrogen ratio for the raw material into a biogas plant?
1.30: 1
2.20: 10
3.5: 15
4.1: 8
Which decomposition process produces carbon dioxide and ammonia?
1.Aerobic decomposition
2.Anaerobic decomposition
3.Thermolysis
4.Thermal decomposition
Which decomposition process produces Carbon dioxide and methane?
1.Aerobic decomposition
2.Anaerobic decomposition
3.Thermolysis
4. Thermal decomposition
Which is the most suitable temperature for the production of methane in anaerobic fermentation?
1.32 – 35oC
2.18 – 26oC
3.40 – 48oC
4.10 – 15oC
Which of the following are considered as contaminant gases in biogas?
1.Chlorine
2.Fluorine
3.Nitrogen, hydrogen and carbon monoxide
4.Methane gas and carbon dioxide
Which of the following are types of pyrolysis?
1.Flash and ablative
2.Intermediate and anaerobic digestion
3.Anaerobic digestion and fermentation
4.Fermentation and intermediate
Which of the following are used to store manure?
1.Silos and cellars
2.Plastic bottles
3.Glass bottles
4.Tin cans
Which of the following best indicates the process in a dual fluidized bed gasifier?
1.Combustion reactor → pyrolysis reactor
2.Pyrolysis reactor → combustion reactor
3.Evaporation reactor → condensation reactor
4.Combustion reactor → condensation reactor
Which of the following gasifiers is suitable for integrated gasification combined cycle (IGCC)?
1.Fluidized gasifier
2.Fixed bed gasifier
3.Downdraft gasifier
4.Entrain flow gasifier
Which of the following hydrothermal processes produces syngas?
1.Hydrothermal gasification
2.Hydrothermal liquefaction
3.Fermentation
4.Hydrothermal carbonisation
Which of the following is a problem due to tar formation in gasifiers?
1.Equipment blockages
2.High system efficiency
3. Improved quality of gas
4.Reduction in maintenance
Which of the following is best suited to decompose lignin?
1.Anerobic digestion
2.Fermentation
3.Thermo-chemical conversion techniques
4. Bio-chemical conversion techniques
Which of the following is produced apart from acetates in acetogenesis step in anaerobic digestion?
1.Carbon monoxide
2.Charcoal
3.Carbon dioxide
4.Acetone
Which of the following is produced in acetogenesis?
1.Ethanol
2.Acetate
3.Acetone
4.Ketone
Which of the following is the mildest hydrothermal process?
1.Hydrothermal gasification
2.Hydrothermal liquefaction
3.Ablate
4.Hydrothermal carbonisation
Which of the following organic compounds are present in biogas?
1.Butane gas and carbon dioxide
2.Methane gas and carbon dioxide
3.Nitrogen
4.Sodium
Which of the following produces a solid hydro-char?
1.Catalytic liquefaction
2.Carbonisation
3.Hydrothermal gasification
4.Hydrothermal carbonisation
Which of the following products of anaerobic digestion consists of organic humus and nutrients?
1.Biogas
2.Chlorine
3.Top soil
4.Bio-fertilizer