| 1 |
Which scenario best demonstrates the importance of energy density in storage systems?
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3. A city-scale backup grid relying on lithium-ion storage for a week |
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| 2 |
If a country lacks harmonized energy storage policy across regions, what consequence is most likely?
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1. Renewable power generation will double |
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| 3 |
Which trade-off is most likely in choosing lithium-sulfur batteries over traditional lithium-ion batteries?
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5. Cheaper materials but higher flammability |
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| 4 |
What is a strategic benefit of combining long-duration and short-duration energy storage technologies in one grid system?
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3. It improves grid flexibility and response time |
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| 5 |
What is a potential environmental risk of not recycling used storage batteries properly?
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2. Toxic leakage into soil and water |
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| 6 |
Which innovation would most effectively reduce intermittency from solar and wind sources?
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3. Developing advanced thermal storage systems |
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| 7 |
In a coastal region with high solar potential but limited grid capacity, what solution aligns best with article insights?
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5. Switching to manual energy devices |
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| 8 |
Which group should take primary responsibility for initiating large-scale energy storage policies?
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3. Regional and international policymakers |
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| 9 |
Why is de-risking through subsidies critical for energy storage projects?
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4. It attracts long-term private investment |
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7 |
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| 10 |
Why is blue hydrogen considered a practical transition option despite its emissions?
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2. It uses zero water input |
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| 11 |
Which future innovation could make hybrid hydrogen systems more sustainable?
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3. Integrating AI to optimize energy input sources |
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| 12 |
What is the likely environmental impact if hydrogen production scales up without effective CCS?
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1. Increase in global fish populations |
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| 13 |
What infrastructure upgrade is most urgent to support hydrogen as a mainstream fuel?
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5. Food waste recycling units |
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| 14 |
Which hydrogen type would be most suitable for a country with abundant solar but limited fossil fuels?
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3. Green hydrogen |
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| 15 |
Which public concern could most hinder hydrogen adoption?
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2. Concerns about safety and flammability |
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| 16 |
Which step in the hydrogen production process could benefit most from thermal integration to save energy?
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3. Methane reforming |
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| 17 |
What makes hybrid hydrogen production more resilient than single-source systems?
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3. It can switch between renewable and non-renewable sources based on availability |
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| 18 |
Which policy action would most directly accelerate low-emission hydrogen deployment?
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3. Funding pilot projects with carbon pricing incentives |
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| 19 |
Based on the diagram, which of the following best explains why geothermal systems are strategically important in addressing both energy storage and carbon management challenges?
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1. They produce only mechanical energy, bypassing the need for storage. |
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| 20 |
Based on the chemical looping dry reforming process shown in the diagram, which of the following best explains a key advantage of using metal-oxide oxygen carriers (OCs) such as Ce₁₋ₓMₓO₂ in hydrogen production?
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5. They generate oxygen gas directly from methane under ambient conditions. |
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