Energy Sources and Efficiency Quiz

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Questions and Answers

Which type of light bulb is more efficient than traditional incandescent bulbs?

  • LED bulbs (correct)
  • Incandescent bulbs
  • Halogen bulbs
  • CFL bulbs

What percentage of the world's electricity is estimated to be consumed by lighting?

  • 20% (correct)
  • 40%
  • 30%
  • 10%

Which of the following is not a type of energy mentioned?

  • Thermal Energy (correct)
  • Geothermal Energy
  • Hydro Power
  • Wind Energy

How does the Sun produce energy?

<p>Nuclear fusion reactions (A)</p> Signup and view all the answers

What is the efficiency percentage of traditional incandescent light bulbs?

<p>5% (D)</p> Signup and view all the answers

What is the primary source of energy that powers the majority of our energy sources?

<p>The Sun (C)</p> Signup and view all the answers

Which energy source is obtained from organic materials, such as plants?

<p>Biomass Energy (A)</p> Signup and view all the answers

What does the net calorific value (NCV) assume about the water produced during combustion?

<p>It leaves with the combustion products without being condensed. (C)</p> Signup and view all the answers

Which of the following liquid fuels has the highest gross calorific value (GCV)?

<p>Kerosene (D)</p> Signup and view all the answers

What is the typical sulfur content range for residual fuel oil (furnace oil)?

<p>2-4% (B)</p> Signup and view all the answers

What is a significant disadvantage of sulfur in fuel oil?

<p>It contributes to the formation of sulfuric acid. (D)</p> Signup and view all the answers

What effect does excessive ash content have on combustion equipment?

<p>It causes fouling deposits in the equipment. (A)</p> Signup and view all the answers

What percentage of energy consumption in the USA in 2014 came from fossil fuels?

<p>81% (C)</p> Signup and view all the answers

Which of the following is considered a secondary energy source?

<p>Electricity (B)</p> Signup and view all the answers

What is the primary role of fuels in energy production?

<p>To provide heat when burned (A)</p> Signup and view all the answers

Which element is NOT typically found in fuels?

<p>Oxygen (C)</p> Signup and view all the answers

Which statement about energy sources is correct?

<p>Primary energy sources include fossil fuels, nuclear energy, and renewables. (D)</p> Signup and view all the answers

What transformation is necessary to utilize the energy of fuel effectively?

<p>From one state to another, such as solid to gas (A)</p> Signup and view all the answers

Which of the following energy sources contributed least to the USA's energy consumption in 2014?

<p>Nuclear energy (A)</p> Signup and view all the answers

Why is hydrogen gas considered an important secondary energy source?

<p>It can be burnt or used in fuel cells. (B)</p> Signup and view all the answers

Which of the following describes the transformation of energy during combustion?

<p>Chemical energy is converted into heat energy. (D)</p> Signup and view all the answers

Which of the following is classified as a renewable energy source?

<p>Hydroelectric energy (B)</p> Signup and view all the answers

What distinguishes non-renewable energy sources from renewable sources?

<p>They are finite and not sustainable. (A)</p> Signup and view all the answers

Which gas is NOT considered a gaseous fuel?

<p>Solar energy (A)</p> Signup and view all the answers

Sustainable development primarily focuses on which of the following principles?

<p>Using resources without depleting them for future generations. (A)</p> Signup and view all the answers

Which of these is an example of a non-renewable energy source?

<p>Uranium (D)</p> Signup and view all the answers

What is a characteristic of renewable energy sources?

<p>They come from persistent natural flows. (C)</p> Signup and view all the answers

Which of these is an example of bioenergy?

<p>Ethanol from crops (A)</p> Signup and view all the answers

Blast furnace gas is typically produced in which industrial process?

<p>Steel production (C)</p> Signup and view all the answers

Which of the following best describes non-renewable energy sources?

<p>They cannot be replenished once consumed. (A)</p> Signup and view all the answers

What role do renewable energy sources play in sustainable development?

<p>They contribute to long-term environmental sustainability. (A)</p> Signup and view all the answers

What is a significant advantage of solid fuels?

<p>Their cost of production is low. (D)</p> Signup and view all the answers

Which of the following is NOT a disadvantage of solid fuels?

<p>Burn without clinkers. (A)</p> Signup and view all the answers

Which of the following accurately describes a feature of liquid fuels?

<p>They can be extinguished by stopping the liquid supply. (B)</p> Signup and view all the answers

What is one disadvantage of using liquid fuels?

<p>They require specially constructed burners for efficient burning. (D)</p> Signup and view all the answers

Which characteristic is associated with gaseous fuels?

<p>They occur naturally in addition to being manufactured. (B)</p> Signup and view all the answers

In comparison to solid fuels, liquid fuels are generally considered:

<p>Cleaner in use. (C)</p> Signup and view all the answers

What is a common risk associated with liquid fuels?

<p>They are highly inflammable and volatile. (A)</p> Signup and view all the answers

What is one advantage regarding the storage of liquid fuels?

<p>They can be stored indefinitely without loss. (C)</p> Signup and view all the answers

Which is an undesirable aspect of solid fuel combustion?

<p>They burn with clinkers. (C)</p> Signup and view all the answers

What disadvantage is specifically associated with gaseous fuels?

<p>They are more difficult to store than liquid fuels. (C)</p> Signup and view all the answers

Flashcards

What is energy?

The ability to do work, such as moving, lifting, warming, or lighting something.

What is Biomass Energy?

Energy derived from sources like plants and organic matter.

What is Geothermal Energy?

Energy obtained from the heat within the Earth.

What is Hydro Power?

Energy generated from the movement of water, often using dams.

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What is Nuclear Energy?

Energy derived from the splitting of atoms, releasing large amounts of heat.

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What is Solar Energy?

Energy harnessed from the sun's rays, often converted to electricity.

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What is Wind Energy?

Energy generated from the movement of wind, often used to power turbines.

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Combustion

The process of converting the chemical energy stored in a fuel into heat energy.

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Fuel

A substance that produces heat when burned by reacting with oxygen or air.

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Primary Energy Sources

Energy sources that are readily available in their natural form, such as fossil fuels, nuclear energy, and renewable sources.

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Secondary Energy Sources

Energy sources derived from the conversion of primary energy sources, like electricity and hydrogen gas.

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Electricity

Energy derived from the conversion of primary energy sources. It allows easy transportation and distribution via a national grid.

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Hydrogen Gas

A secondary energy source that can be burned directly or utilized in fuel cells to produce energy.

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Annual Energy Consumption

The amount of energy consumed per year. This varies depending on the country and year.

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Fuel Transformation

The process of transforming a fuel from one state to another, such as solid to liquid or gaseous, to utilize its energy effectively.

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Combustible Elements

Elements like carbon, hydrogen, and sulfur that are found in fuels and contribute to combustion.

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Advantage of Solid Fuels

Solid fuels are easily stored and pose no risk of spontaneous explosions.

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Advantage of Solid Fuels

Solid fuels are relatively inexpensive to produce.

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Advantage of Solid Fuels

Solid fuels have a moderate ignition temperature, making them relatively safe to handle.

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Disadvantage of Solid Fuels

Solid fuels produce a high amount of ash when burned.

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Disadvantage of Solid Fuels

Solid fuels waste a significant amount of heat during combustion.

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Disadvantage of Solid Fuels

Solid fuels burn with the formation of clinkers, solid residues that can clog furnaces.

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Disadvantage of Solid Fuels

Solid fuels are difficult to control during combustion.

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Disadvantage of Solid Fuels

Solid fuels can be costly to handle and transport.

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Advantage of Liquid Fuels

Liquid fuels offer a higher energy content per unit mass compared to solid fuels.

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Advantage of Liquid Fuels

Liquid fuels burn cleanly without producing ash, dust, or clinkers.

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Renewable Energy Source

A natural and persistent flow of energy like solar, wind, or hydro power, replenished by natural processes.

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Non-renewable Energy Source

A finite store of energy like coal, oil, or nuclear fuels, which cannot be replenished on a human timescale.

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Sustainable Development

The process of using resources and developing in a way that meets current needs without harming future generations.

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Natural Gas

A gaseous fuel primarily composed of methane, widely used for heating and electricity generation.

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Coal Gas

A gaseous fuel produced by heating coal in the absence of air, containing hydrogen, methane, and other gases.

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Producer Gas

A gaseous fuel produced by partial combustion of coal or biomass, primarily used for industrial heating processes.

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Water Gas

A gaseous fuel made by reacting steam with hot coke, containing hydrogen, carbon monoxide, and other gases.

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Acetylene

A highly flammable gas used as a fuel in welding and cutting torches, produced from reacting calcium carbide with water.

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Blast Furnace Gas

A gaseous fuel obtained from the blast furnace during iron production, containing carbon monoxide, nitrogen, and other gases.

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Oil Gas

A gaseous fuel produced by the thermal cracking of oil or natural gas, containing hydrocarbons, methane, and other gases.

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Gross Calorific Value (GCV)

The total amount of heat released when a fuel is completely burned, assuming that all the water vapor produced is fully condensed.

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Net Calorific Value (NCV)

The amount of heat released when a fuel is completely burned, taking into account the heat lost during the exhaust of water vapor.

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Sulphur in Fuel Oil

A chemical element that can cause corrosion in combustion systems due to the formation of sulfuric acid during the burning process.

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Ash Content in Fuel Oil

Inorganic materials present in fuel oil that can accumulate as ash during combustion, leading to various problems in combustion equipment.

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Fouling Deposits

The accumulation of ash deposits on the inside surfaces of combustion equipment, hindering its efficiency and potentially causing damage.

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Study Notes

Introduction to Energy Sources

  • Energy is crucial for daily life and technological advancements
  • Issues like supply and cost, and environmental impact are important
  • The chapter covers energy consumption, resources, and transformation
  • It also discusses the role of energy storage

Energy Consumption

  • Bodily functions (heartbeat, respiration, etc.) consume ~100 J/s (100 W)
  • Physical activities, such as climbing stairs (75 kg person), use more energy
  • Average daily energy consumption for a person is ~125 W (~10 MJ)
  • Food provides this energy, a typical food item (baked beans) provides ~1.5 MJ
  • Everyday activities, such as transportation, heating, and industry, need significant energy
  • UK per person daily consumption is ~450 MJ (~125 kWh)
  • Global energy consumption has increased significantly since 1820
  • Technological advances and population growth are major contributors

Energy Sources

  • Energy comes from various sources, including: -Fossil fuels (coal, oil, and natural gas) -Hydropower and ocean energy -Nuclear energy -Solar energy -Wind energy
  • Most energy comes, directly or indirectly from the sun
  • The global consumption of energy ~5 × 1020 J/year.
  • Energy efficiency is another key consideration

Renewable and Non-renewable Sources

  • Renewable sources have persistent flows like solar, wind, and hydro (and some forms of bio-energy are renewable in terms of sustainable practices)
  • Nonrenewable sources are finite supplies like fossil fuels and some forms of nuclear
  • The distinction between renewable and nonrenewable sources is important for sustainability

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