R4RIN – MCQs, Mock Tests | Agricultural Engineering Agricultural Engineering MCQs Set-2

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

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which of the following is produced in acetogenesis?

1. Ethanol
2. Acetate
3. Acetone
4. Ketone

✅ Correct Answer: 2

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

✅ Correct Answer: 3

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

✅ Correct Answer: 4

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

1. False
2. True
3.
4.

✅ Correct Answer: 1

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

✅ Correct Answer: 2

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

1. True
2. False
3.
4.

✅ Correct Answer: 1

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

✅ Correct Answer: 2

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

✅ Correct Answer: 3

Which of the following products of anaerobic digestion consists of organic humus and nutrients?

1. Biogas
2. Chlorine
3. Top soil
4. Bio-fertilizer

✅ Correct Answer: 4

Which of the following are used to store manure?

1. Silos and cellars
2. Plastic bottles
3. Glass bottles
4. Tin cans

✅ Correct Answer: 1

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

✅ Correct Answer: 2

Thermo-chemical processes have higher efficiencies than bio-chemical processes.

1. True
2. False
3.
4.

✅ Correct Answer: 1

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

✅ Correct Answer: 3

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

✅ Correct Answer: 1

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

1. True
2. False
3.
4.

✅ Correct Answer: 2

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

✅ Correct Answer: 3

Which of the following is the mildest hydrothermal process?

1. Hydrothermal gasification
2. Hydrothermal liquefaction
3. Ablate
4. Hydrothermal carbonisation

✅ Correct Answer: 4

Which of the following hydrothermal processes produces syngas?

1. Hydrothermal gasification
2. Hydrothermal liquefaction
3. Fermentation
4. Hydrothermal carbonisation

✅ Correct Answer: 1

Hydrothermal liquefaction produces _________

1. syngas
2. bio-crude
3. bio-oil
4. producer gas

✅ Correct Answer: 3

Which of the following produces a solid hydro-char?

1. Catalytic liquefaction
2. Carbonisation
3. Hydrothermal gasification
4. Hydrothermal carbonisation

✅ Correct Answer: 4

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

✅ Correct Answer: 1

What ensures consistency of temperature in fluidized gasifier?

1. Gasification agent
2. Air-fluidized bed material
3. Biomass
4. Air non-permeable bed material

✅ Correct Answer: 2

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

✅ Correct Answer: 3

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

✅ Correct Answer: 4

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

✅ Correct Answer: 1

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

✅ Correct Answer: 2

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

✅ Correct Answer: 3

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

✅ Correct Answer: 4

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

1. True
2. False
3.
4.

✅ Correct Answer: 1

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

✅ Correct Answer: 2

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

✅ Correct Answer: 3

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

✅ Correct Answer: 4

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

✅ Correct Answer: 1

Which of the following is a component of tar?

1. Sodium
2. Benzene
3. Chlorine
4. Nickel

✅ Correct Answer: 2

Tar is removed by choosing the appropriate catalyst.

1. True
2. False
3.
4.

✅ Correct Answer: 1

How many types of basic organic decomposition occur in Biomass energy conversion?

1. 2
2. 3
3. 4
4. 5

✅ Correct Answer: 1

Which decomposition process produces carbon dioxide and ammonia?

1. Aerobic decomposition
2. Anaerobic decomposition
3. Thermolysis
4. Thermal decomposition

✅ Correct Answer: 1

Which decomposition process produces Carbon dioxide and methane?

1. Aerobic decomposition
2. Anaerobic decomposition
3. Thermolysis
4. Thermal decomposition

✅ Correct Answer: 2

Anaerobic fermentation is how many staged process?

1. Single stage
2. Two – stage
3. 3-stage
4. 4 – stage

✅ Correct Answer: 2

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

✅ Correct Answer: 1

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

✅ Correct Answer: 1

Below which temperature the action off digesting bacteria decreases?

1. 16oC
2. 35oC
3. 28oC
4. 0oC

✅ Correct Answer: 1

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

✅ Correct Answer: 1

Too nitrogen will cause ____________

1. Poisonous gases
2. Reduction in fertility of mixture
3. Reduction in quantity of mixture
4. Mixture to harden

✅ Correct Answer: 2

How much percentage of solid content is present in anaerobic digestion?

1. 8%
2. 2%
3. 32%
4. 50%

✅ Correct Answer: 1

The central part of an anaerobic plant in an enclosed tank is known as ____________

1. Pit
2. Digester
3. Mixer
4. Feeder

✅ Correct Answer: 2

What is ADP stand for?

1. Adenosine terra phosphate
2. NADPH
3. Adenosine pyrophosphate
4. Adenosine tri-phosphate

✅ Correct Answer: 3

Product of anaerobic decomposition involves ___________

1. Methane
2. Lactic acid
3. Oxygen
4. Alcohol

✅ Correct Answer: 1

Solid remnants of the original input material to the digesters are called ________

1. Ordure
2. Egests
3. Digestate
4. Manure

✅ Correct Answer: 3