[L10]_Biomass & Biogas Systems

Question 1

ENGY-775

What is the main chemical process through which biomass stores solar energy?
A) Respiration
B) Photosynthesis
C) Fermentation
D) Pyrolysis

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Answer 1

B) Photosynthesis

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Question 2

ENGY-775

True or False: Peat is a modern biomass fuel.

[L10]

Answer 2

False

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Question 3

ENGY-775

Fill in the blank: The energy content of a fuel is often expressed in ________ per gallon or pound.

[L10]

Answer 3

BTUs

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Question 4

ENGY-775

Which of the following is not a component of woody biomass?
A) Cellulose
B) Hemicellulose
C) Lignin
D) Starch

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Answer 4

D) Starch

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Question 5

ENGY-775

True or False: Modern bioenergy production aims to produce no more carbon dioxide than natural processes would emit.

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Answer 5

True

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Question 6

ENGY-775

Fill in the blank: Biomass conversion efficiency is approximately ________% of the solar radiation reaching a growing plant.

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Answer 6

0.64%

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Question 7

ENGY-775

Which of the following processes is not involved in biofuel production?
A) Transesterification
B) Pyrolysis
C) Hydrothermal processing
D) Combustion

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Answer 7

D) Combustion

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Question 8

ENGY-775

True or False: Biochar is a product of anaerobic digestion.

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Answer 8

False

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Question 9

ENGY-775

What is the primary component of biogas by volume?
A) Carbon dioxide
B) Methane
C) Oxygen
D) Nitrogen

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Answer 9

B) Methane

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Question 10

ENGY-775

Fill in the blank: Anaerobic digestion occurs in the absence of ________.

[L10]

Answer 10

oxygen

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Question 11

ENGY-775

True or False: Torrefied wood has a higher energy density than untreated wood.

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Answer 11

True

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Question 12

ENGY-775

Which of the following is not a form of bioenergy?
A) Bioethanol
B) Biobutanol
C) Syngas
D) Coal

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Answer 12

D) Coal

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Question 13

ENGY-775

Methane is ________ times more effective than carbon dioxide at trapping heat in the atmosphere over a 100-year period.

A) 10-15
B) 20-25
C) 28-36
D) 40-50

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Answer 13

C) 28-36

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Question 14

ENGY-775

True or False: Biogas can be produced from landfill waste.

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Answer 14

True

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Question 15

ENGY-775

Fill in the blank: Wet biogas systems require the moisture content of input material to exceed ________%.

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Answer 15

75%

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Question 16

ENGY-775

Which characteristic is unique to dry biogas systems compared to wet systems?

A) High wastewater volume
B) Continuous input movement
C) No pretreatment of input required
D) High mechanical maintenance costs

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Answer 16

C) No pretreatment of input required

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Question 17

ENGY-775

True or False: Algae bioreactors require sunlight in closed systems.

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Answer 17

False

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Question 18

ENGY-775

Which material is not typically used in biomass CHP plants?

A) Sugarcane
B) Maize
C) Petroleum coke
D) Miscanthus

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Answer 18

C) Petroleum coke

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Question 19

ENGY-775

Fill in the blank: The main source of sugar for bioethanol production includes crops like ________ and sugar beet.

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Answer 19

maize

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Question 20

ENGY-775

Which type of reactor is used for algae that does not require sunlight?

A) Tubular bioreactor
B) Stirred tank bioreactor
C) Photo bioreactor
D) Bubble column reactor

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Answer 20

B) Stirred tank bioreactor

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