Chapter 4 Multiple Choice Questions

1) The burning of traditional biomass provides about ____ percentage of the world's final energy demand.

2) The typical percentage of solar energy converted into biomass is about…

1%.

8%.

25%.

3) Match the regions to the plant type.

3a.

Tropical regions

3b.

Temperate regions

3c.

Semi-arid land

3d.

Marsh land

4) Starch and cellulose are both biopolymers of _____.

5) Match the heats of combustion to the compounds.

5a.

~16 MJ kg^-¹

5b.

~38 MJ kg^-¹

5c.

~30 MJ kg^-¹

5d.

~45 MJ kg^-¹

6) Which of the following statements about traditional biomass cooking are true? Please select all that apply.

Improved cooking stoves eliminate the damaging effects of air pollution

In the short term, burning propane for cooking rather than using conventional biomass stoves is preferable

Adding a chimney is a cheap, versatile, and effective solution to air pollution from stoves.

Reducing air pollution significantly requires insulating the combustion region and providing sufficient air.

7) Estimate the amount of electricity in TWh that could be produced annually from a biomass-fired power station that burns biomass grown over an area of 50km by 50km.

11

4

1.1

0.04

8) ______ digestion is the decomposition of organic matter in the absence of air by bacteria.

9) In gasification, a decrease in temperature at constant pressure favours the products of an _____ reaction.

10) The amount of CO₂emitted in the burning of municipal waste is about…

30 g/kWh.

180 g/kWh.

360 g/kWh.

600 g/kWh.

11) What percentage of the ~110 EJ of energy used in transport worldwide do biofuels provide?

1%

3%

10%

12) Ethanol is produced from sugar by _______.

13) Match the process to the product.

13a.

Enzyme hydrolysis

13b.

Trans-esterification

13c.

Pyrolysis

14) How many people in the developing world rely on traditional biomass, coal, or kerosene for cooking on traditional stoves or open fires?

~0.5 billion

~1.5 billion

~2.5 billion

15) Match the fossil fuel replacement ratios to the biofuel source.

15a.

Ethanol from corn

15b.

Ethanol from sugarcane

51c.

Biodiesel from palm oil

51d.

Biodiesel from jatropha

16) Match the CO₂ replacement times to the feedstocks.

16a.

Palm oil

16b.

Sugarcane

16c.

Switchgrass

17) Which biomass feedstock has the least environmental risk?

Rapeseed

Palm oil

Forest residues

Corn

18) Which of the following statements about biomass are true?
Please select all that apply.

Water supply is not a concern for large scale biomass production.

Food production can be in competition with biomass production.

Electricity from biomass does require energy storage.

Biomass can be close to being a carbon-neutral fuel.

19) Match the potential yields (litre ha^-¹ y^-¹) of biofuel to the feedstocks

19a.

Sugarcane

19b.

Algae

19c.

Cassava

19d.

Rapeseed

20) What percentage of the global final energy demand could traditional and modern biomass supply in 2050?

~10%

~15%

~30%

Quiz Content