Agricultural Engineering MCQ Quiz Hub

1. Acidogenesis further break down the molecules received from hydrolysis in anaerobic digestion.
True
False

2. Which of the following is produced in acetogenesis?
Ethanol
Acetate
Acetone
Ketone

3. Which of the following is produced apart from acetates in acetogenesis step in anaerobic digestion?
Carbon monoxide
Charcoal
Carbon dioxide
Acetone

4. What are the two ways to produce methane in methanogenesis step?
Converting carbon monoxide and carbon dioxide into methane
Converting carbon monoxide and acetic acid (or acetate) into methane
Converting methane into carbon monoxide and carbon dioxide
Converting carbon dioxide and acetic acid (or acetate) into methane

5. Methanogens can directly use the products of hydrolysis to produce methane.
False
True

6. What are the two main products of anaerobic digestion?
Carbon monoxide and hydrogen
Methane and carbon dioxide
Methane and carbon monoxide
Hydrogen and carbon dioxide

7. Gases emitted from the digester indicates the amount of biomass left to be broken down.
True
False

8. Which of the following organic compounds are present in biogas?
Butane gas and carbon dioxide
Methane gas and carbon dioxide
Nitrogen
Sodium

9. Which of the following are considered as contaminant gases in biogas?
Chlorine
Fluorine
Nitrogen, hydrogen and carbon monoxide
Methane gas and carbon dioxide

10. Which of the following products of anaerobic digestion consists of organic humus and nutrients?
Biogas
Chlorine
Top soil
Bio-fertilizer

11. Which of the following are used to store manure?
Silos and cellars
Plastic bottles
Glass bottles
Tin cans

12. What are the three methods of pre-treatment of influent for anaerobic digestion?
Galvanization, pyrolysis and pre-heating
Mechanical treatment, pre-heating and thermal treatment
Galvanization, pyrolysis and thermal treatment
Pyrolysis, thermal treatment and pre-heating

13. Thermo-chemical processes have higher efficiencies than bio-chemical processes.
True
False

14. Which of the following is best suited to decompose lignin?
Anerobic digestion
Fermentation
Thermo-chemical conversion techniques
Bio-chemical conversion techniques

15. Which of the following are types of pyrolysis?
Flash and ablative
Intermediate and anaerobic digestion
Anaerobic digestion and fermentation
Fermentation and intermediate

16. Bio-oil has double the heating value of conventional fuel oil.
True
False

17. What are the three types of hydrothermal processing of biomass?
Hydrothermal liquefaction, hydrothermal gasification and ablate pyrolysis
Hydrothermal liquefaction, hydrothermal gasification and fast pyrolysis
Hydrothermal liquefaction, hydrothermal gasification and hydrothermal carbonisation
Intermediate pyrolysis, hydrothermal gasification and ablate pyrolysis

18. Which of the following is the mildest hydrothermal process?
Hydrothermal gasification
Hydrothermal liquefaction
Ablate
Hydrothermal carbonisation

19. Which of the following hydrothermal processes produces syngas?
Hydrothermal gasification
Hydrothermal liquefaction
Fermentation
Hydrothermal carbonisation

20. Hydrothermal liquefaction produces _________
syngas
bio-crude
bio-oil
producer gas

21. Which of the following produces a solid hydro-char?
Catalytic liquefaction
Carbonisation
Hydrothermal gasification
Hydrothermal carbonisation

22. What is unique about the gasification agent entering in a fluidized gasifier?
Enters from bottom at a relatively fast rate as compared to a fixed bed gasifier
Enters from bottom at a relatively slow rate as compared to a fixed bed gasifier
Enters from top at a relatively fast rate as compared to a fixed bed gasifier
Enters from top at a relatively slow rate as compared to a fixed bed gasifier

23. What ensures consistency of temperature in fluidized gasifier?
Gasification agent
Air-fluidized bed material
Biomass
Air non-permeable bed material

24. What are the three types of fluidized gasifiers used?
Single fluidized bed, dual fluidized bed and bubbling fluidized bed
Straight fluidized bed, dual fluidized bed and bubbling fluidized bed
Circulating fluidized bed, dual fluidized bed and bubbling fluidized bed
Single fluidized bed, dual fluidized bed and straight fluidized bed

25. How is the temperature maintained in a bubbling fluidized bed?
Biomass
Gasification agent
A constant ratio of biomass and gasification agent
Manipulating the ratio of biomass and gasification agent

26. What is the temperature range in a bubbling fluidized bed?
Between 700 and 900 degree Celsius
Less than 500 degree Celsius
Above 1000 degree Celsius
Between 100 and 200 degree Celsius

27. What is the biomass decomposed to in a bubbly fluidized bed?
Producer gas
Char and gas products with a low tar percentage
Char and gas products with a high tar percentage
Char with a low tar percentage

28. What are the two main units in a circulating fluidized bed?
Bubbling fluidized bed and dual fluidized bed
Bubbling fluidized bed and gasifier unit
Circulating unit and gasifier unit
Circulating unit and dual fluidized bed

29. Where can the ash and hot gas be separated in a circulating fluidized bed gasifier?
Gasifier unit
Circulation unit
Tornado separator
Cyclone separator

30. The two separate fluidized beds in a dual fluidized bed gasifier are used for pyrolysis and combustion process.
True
False

31. Which of the following best indicates the process in a dual fluidized bed gasifier?
Combustion reactor → pyrolysis reactor
Pyrolysis reactor → combustion reactor
Evaporation reactor → condensation reactor
Combustion reactor → condensation reactor

32. What are the two types of entrained flow gasifiers?
Bubbling fluidized gasifier and dual fluidized gasifier
Bubbling fluidized gasifier and top-fed gasifier
Top-fed gasifier and side-fed gasifier
Side-fed gasifier and dual fluidized gasifier

33. Which of the following gasifiers is suitable for integrated gasification combined cycle (IGCC)?
Fluidized gasifier
Fixed bed gasifier
Downdraft gasifier
Entrain flow gasifier

34. Which of the following is a problem due to tar formation in gasifiers?
Equipment blockages
High system efficiency
Improved quality of gas
Reduction in maintenance

35. Which of the following is a component of tar?
Sodium
Benzene
Chlorine
Nickel

36. Tar is removed by choosing the appropriate catalyst.
True
False

37. How many types of basic organic decomposition occur in Biomass energy conversion?
2
3
4
5

38. Which decomposition process produces carbon dioxide and ammonia?
Aerobic decomposition
Anaerobic decomposition
Thermolysis
Thermal decomposition

39. Which decomposition process produces Carbon dioxide and methane?
Aerobic decomposition
Anaerobic decomposition
Thermolysis
Thermal decomposition

40. Anaerobic fermentation is how many staged process?
Single stage
Two – stage
3-stage
4 – stage

41. In what PH range does anaerobic digestion occurs at best?
6.8 – 8.0
0 – 5.0
2.3 – 4.5
3.5 – 7.2

42. Which amount is the ideal carbon-nitrogen ratio for the raw material into a biogas plant?
30: 1
20: 10
5: 15
1: 8

43. Below which temperature the action off digesting bacteria decreases?
16oC
35oC
28oC
0oC

44. Which is the most suitable temperature for the production of methane in anaerobic fermentation?
32 – 35oC
18 – 26oC
40 – 48oC
10 – 15oC

45. Too nitrogen will cause ____________
Poisonous gases
Reduction in fertility of mixture
Reduction in quantity of mixture
Mixture to harden

46. How much percentage of solid content is present in anaerobic digestion?
8%
2%
32%
50%

47. The central part of an anaerobic plant in an enclosed tank is known as ____________
Pit
Digester
Mixer
Feeder

48. What is ADP stand for?
Adenosine terra phosphate
NADPH
Adenosine pyrophosphate
Adenosine tri-phosphate

49. Product of anaerobic decomposition involves ___________
Methane
Lactic acid
Oxygen
Alcohol

50. Solid remnants of the original input material to the digesters are called ________
Ordure
Egests
Digestate
Manure