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Energy and biofuels Quiz 2

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Theme: Energy and biofuels EB Quiz 2 Energy and biofuels Quiz 2

Energy and biofuels Quiz 2

Read the following articles before attempting this quiz:

Chemical recovery
Evaporation
Principles of evaporation
Steam economy
Recovery boiler
Causticising
Lime kiln
Biomass boiler
NCG destruction
Auxiliary boilers

Energy and biofuels Quiz 2

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Question 1 of 10

1. Question
1. What is the main purpose of chemical recovery in the kraft process?
- A. To recycle pulping chemicals and generate steam and power.
- B. To remove bark from logs before pulping.
- C. To bleach pulp to a higher brightness.
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Question 2 of 10

2. Question
2. What is the name of the liquid stream formed from dissolved wood components and spent cooking chemicals?
- A. White liquor
- B. Weak black liquor
- C. Green liquor
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Question 3 of 10

3. Question
3. What does reduction efficiency (typically 90–95%) measure in the recovery boiler?
- A. The amount of water evaporated per hour.
- B. The conversion of sodium carbonate to sodium hydroxide.
- C. The conversion of sulphur to sodium sulphide.
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Question 4 of 10

4. Question
4. What is formed when molten smelt from the recovery boiler is dissolved in water?
- A. Green liquor
- B. White liquor
- C. Black liquor
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Question 5 of 10

5. Question
5. What is the purpose of causticising?
- A. To convert sodium carbonate to sodium hydroxide for reuse.
- B. To dry pulp sheets for shipping.
- C. To separate lignin from wood with heat alone.
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Question 6 of 10

6. Question
6. What reaction occurs in the lime kiln?
- A. Sodium hydroxide converting to sodium carbonate.
- B. Calcium carbonate dissociating into calcium oxide and carbon dioxide.
- C. Sodium sulphate converting into sodium sulphide.
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Question 7 of 10

7. Question
7. What is the main purpose of the biomass boiler in a pulp mill?
- A. To generate process steam that can also be used for electricity production.
- B. To concentrate black liquor to higher solids.
- C. To remove NPEs (non‑process elements) from the liquor cycle.
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Question 8 of 10

8. Question
8. What gases make up the non‑condensable gases (NCG) formed in kraft pulping?
- A. Oxygen and nitrogen.
- B. Hydrogen sulphide, methyl mercaptan, DMS, and DMDS.
- C. Carbon dioxide and methane.
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Question 9 of 10

9. Question
9. What is the role of auxiliary boilers in a pulp mill?
- A. To produce extra white liquor during peak production.
- B. To provide backup steam during shutdowns and maintenance.
- C. To increase pulp yield during cooking.
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Question 10 of 10

10. Question
10. What type of fuel can modern lime kilns co‑fire to reduce fossil fuel use?
- A. Pure chlorine compounds
- B. Biomass‑based fuels such as biogas and bark gasification products.
- C. Liquid nitrogen
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This page has been updated 02.04.2026

Energy and biofuels

Introduction to Energy and biofuels
Global forest industry energy use
Production processes recovery and energy
- 📋 Theme Quiz 1
Chemical recovery
Energy consumption trends in forest industry
Defining the energy consumption in modern processes
Energy supply in forest industry
Energy production with options for increased power production
Novel solutions in the pulp mill energy supply
Improvement of energy efficiency

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