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Energy and biofuels Quiz 5

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Theme: Energy and biofuels EB Quiz 5 Energy and biofuels Quiz 5

Energy and biofuels Quiz 5

Read the following articles before attempting this quiz:

Energy supply in forest industry
Heat and power generation
Material and energy balance
Example mass balance
Example flue gas
Example steam flow
Heat and power balance in a modern greenfield pulp mill
Intermittent renewable energy sources impacting pulp and paper industry

Energy and biofuels Quiz 5

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Question 1 of 10

1. Question
1. Why do most pulp and paper mills produce their own energy?
- A. Because mills operate continuously and require large amounts of heat and electricity.
- B. Because national regulations forbid buying electricity.
- C. Because external electricity is always more expensive.
Correct

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Question 2 of 10

2. Question
2. Why has electricity consumption in the Finnish forest industry decreased?
- A. Due to increased electricity imports.
- B. Because of reduced production volumes and improved energy efficiency.
- C. Because mills stopped producing mechanical pulp entirely.
Correct

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Question 3 of 10

3. Question
3. How fossil fuel use in global pulp and paper industry have changed in 21st century?
- A. Fossil fuel use increased approximately by one fifth.
- B. Fossil fuel use decreased by more than one third.
- C. Fossil fuel use stayed the same.
Correct

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Question 4 of 10

4. Question
4. Which boiler is the primary producer of high‑pressure steam in a kraft pulp mill?
- A. CHPP turbine boiler
- B. Recovery boiler (RB)
- C. Kiln preheat boiler
Correct

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Question 5 of 10

5. Question
5. What happens to exhaust steam in mills equipped with a condensing tail turbine?
- A. It is vented to the atmosphere.
- B. It produces only low‑temperature hot water.
- C. It is converted into mechanical energy for pumps.
Correct

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Question 6 of 10

6. Question
6. What is the main heat loss source in recovery boilers?
- A. Electrical equipment
- B. Furnace radiation only
- C. Pipes
Correct

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Question 7 of 10

7. Question
7. In recovery boiler efficiency calculations, which heating value is typically used in Europe?
- A. Higher heating value (HHV)
- B. Lower heating value (LHV) minus reduction and autocausticising heats.
- C. Net boiler room heating value (NBHV)
Correct

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Question 8 of 10

8. Question
8. What is the typical steam generation efficiency of a modern recovery boiler?
- A. About 50% based on lower heating value.
- B. About 90% based on lower heating value.
- C. About 30% based on lower heating value.
Correct

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Question 9 of 10

9. Question
9. In a modern greenfield kraft pulp mill, how is most surplus electricity generated?
- A. Through condensing turbines using high‑pressure steam.
- B. Through diesel generators.
- C. Through rooftop solar panels.
Correct

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Question 10 of 10

10. Question
10. How can mills respond to fluctuating electricity prices?
- A. By shutting down all processes during high‑price hours.
- B. By adjusting electric boiler or heat pump use based on price levels.
- C. By converting all machinery to run on gasoline instead of electricity.
Correct

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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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