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Renewable Energy Multiple-Choice Questions (MCQs)

Renewable Energy MCQs: Explore and practice these top 50+ multiple-choice questions with answers on all chapters of Renewable Energy to test and enhance your knowledge of Renewable Energy.

Renewable Energy MCQs with Answers

1. Is all renewable energy considered green energy?

  1. Yes
  2. No

Answer: B) No

Explanation:

While renewable energy sources such as solar energy are often regarded as green energy since they emit little greenhouse gases when in use, not all renewable energy sources are necessarily green.

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2. How many types of solar energy are there?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

Solar energy can be consumed in two ways:

  • Active solar energy
  • Passive solar energy

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3. Solar Chimney is an example of active solar energy or passive solar energy?

  1. Active solar energy
  2. Passive solar energy

Answer: B) Passive solar energy

Explanation:

Solar Chimney is an example of passive solar energy.

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4. Which of the following is not an example of Active solar energy?

  1. Radiant floor
  2. Concentrated solar power
  3. Trombe wall
  4. Photovoltaic system

Answer: C) Trombe wall

Explanation:

Trombe wall is not an example of Active solar energy.

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5. The ____ technique is a way of producing power from sunlight.

  1. Inverter
  2. Net metering
  3. Photovoltaic
  4. Array

Answer: C) Photovoltaic

Explanation:

The Photovoltaic technique is a way of producing power from sunlight.

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6. The majority of charge carriers in an N-type semiconductor are ____.

  1. Proton
  2. Electron
  3. Photons
  4. Neutrons

Answer: B) Electron

Explanation:

The majority of charge carriers in an N-type semiconductor are electrons.

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7. PV cells are made up of ____.

  1. Conductors
  2. Insulators
  3. Semiconductors

Answer: C) Semiconductors

Explanation:

PV cells are generally constructed using semiconductor materials.

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8. When applied to photovoltaic cells, ____ refers to the modification of the cell's performance or characteristics by applying an external voltage or electric field.

  1. Biasing
  2. Depletion layer
  3. Barrier potential
  4. Electric potential

Answer: A) Biasing

Explanation:

When applied to photovoltaic cells, biasing refers to the modification of the cell's performance or characteristics by applying an external voltage or electric field.

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9. How many types of biasing are there in the context of PV cells?

  1. 3
  2. 2
  3. 4
  4. 5

Answer: B) 2

Explanation:

There are two types of biasing:

  • Forward biasing
  • Reverse biasing

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10. Which of the following statements is True?

  1. The forward biasing process involves applying a positive voltage to the p-type region of the solar cell, and a negative voltage to the n-type region.
  2. The forward biasing process involves applying a negative voltage to the p-type region of the solar cell, and a positive voltage to the n-type region

Answer: A) The forward biasing process involves applying a positive voltage to the p-type region of the solar cell, and a negative voltage to the n-type region.

Explanation:

The forward biasing process involves applying a positive voltage to the p-type region of the solar cell, and a negative voltage to the n-type region.

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11. Solar radiation also known as ____ radiation.

  1. Coenergy radiation
  2. Electric radiation
  3. Electromagnetic radiation
  4. Electromechanical radiation

Answer: C) Electromagnetic radiation

Explanation:

Solar radiation is also known as electromagnetic radiation.

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12. Mirrors are used in which solar technology systems to reflect and focus sunlight onto receivers that gather solar energy and convert it to heat.

  1. Solar powered pumps
  2. Building-Integrated Photovoltaics (BIPV)
  3. Photovoltaic cells (PV)
  4. Concentrated solar-thermal power (CSP)

Answer: D) Concentrated solar-thermal power (CSP)

Explanation:

Mirrors are used in concentrated solar-thermal power (CSP) systems to reflect and focus sunlight onto receivers that gather solar energy and convert it to heat.

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13. Which of the following occurs in the sun and is responsible for generating solar energy?

  1. Nuclear fission
  2. Nuclear Fusion
  3. Both
  4. None

Answer: B) Nuclear Fusion

Explanation:

Nuclear fusion occurs in the sun and is responsible for generating solar energy.

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14. Which of the following types of the photovoltaic cell was created by pouring silicon into a square mould?

  1. Mono-crystalline cells
  2. Poly-crystalline cells

Answer: B) Poly-crystalline cells

Explanation:

Poly-crystalline cell types of photovoltaic cell was created by pouring silicon into a square mould.

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15. Which of the following is the oldest design of a geothermal power plant?

  1. Flash steam power stations
  2. Binary cycle power stations
  3. Dry-steam power stations

Answer: C) Dry-steam power stations

Explanation:

Dry-steam power stations are the oldest design of geothermal power plants.

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16. Geothermal power systems that use high-pressure hot water from subsurface reservoirs are known as ____.

  1. Flash steam power stations
  2. Binary cycle power stations
  3. Dry-steam power stations

Answer: A) Flash steam power stations

Explanation:

Geothermal power systems that use high-pressure hot water from subsurface reservoirs are known as flash steam power plants.

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17. To create electricity, which of the following geothermal power plants draws high-pressure steam straight from subsurface reservoirs and powers a turbine-generator system?

  1. Flash steam power stations
  2. Binary cycle power stations
  3. Dry-steam power stations

Answer: C) Dry-steam power stations

Explanation:

To create electricity, dry-steam power stations, and geothermal power plants draws high-pressure steam straight from subsurface reservoirs and power a turbine-generator system.

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18. ____ are subsurface layers of porous rock, gravel, or sand that hold water and enable groundwater to flow.

  1. Aquifers
  2. Unsolidated rocks
  3. Aqueducts
  4. Reservoir

Answer: A) Aquifers

Explanation:

Aquifers are subsurface layers of porous rock, gravel, or sand that hold water and enable groundwater to flow.

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19. How many types of hydroelectric power turbines are there?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

Hydroelectric power turbines are mainly divided into two types:

  • Reaction
  • Impulse

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20. Which of the following turbines are built to work with water pressure and flow?

  1. Reaction turbines
  2. Impulse turbine

Answer: A) Reaction turbines

Explanation:

Reaction turbines are built to work with water pressure and flow.

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21. In most cases, ____ turbines are employed in high-head applications

  1. Reaction turbines
  2. Impulse turbine

Answer: B) Impulse turbine

Explanation:

In most cases, impulse turbines are employed in high-head applications.

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22. Wind turbines are divided into how many categories?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

Wind turbines are divided into two categories: horizontal-axis wind turbines and vertical-axis wind turbines.

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23. Among horizontal axis wind turbines and vertical axis wind turbines which has higher efficiency?

  1. Horizontal-axis wind turbines
  2. Vertical axis wind turbines

Answer: A) Horizontal-axis wind turbines

Explanation:

Horizontal-axis wind turbines have higher efficiency than vertical-axis wind turbines.

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24. Which turbines typically have lesser power-generating capability?

  1. Horizontal-axis wind turbines
  2. Vertical axis wind turbines

Answer: B) Vertical axis wind turbines.

Explanation:

Vertical-axis wind Turbines typically have lesser power-generating capability than Horizontal axis wind turbines. As a result, they are frequently employed in smaller-scale applications.

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25. The dominating winds that blow persistently over a certain region are known as ____ winds.

  1. Trade winds
  2. Westerlies
  3. Katabatic winds
  4. Prevailing winds

Answer: D) Prevailing winds

Explanation:

The dominating winds that blow persistently over a certain region are known as prevailing winds.

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26. Which of the following statement is True about Trade winds?

  1. The trade winds blow steadily from north to west
  2. The trade winds blow steadily from east to south
  3. The trade winds blow steadily from east to west
  4. The trade winds blow steadily from South to North

Answer: C) The trade winds blow steadily from east to west.

Explanation:

The trade winds blow steadily from east to west.

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27. Which of the following winds are prevailing winds that blow from west to east?

  1. Polar easterlies
  2. Westerlies
  3. Monsoonal winds
  4. Katabatic winds

Answer: B) Westerlies

Explanation:

The westerlies winds are prevailing winds that blow from west to east.

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28. What are Gusts?

  1. Gusts are rapid changes in wind direction (Latitude wise).
  2. Gusts are increases in the induction of various renewable energy.
  3. Gusts are rapid, transient increases in wind speed. Ohm's law

Answer: C) Gusts are rapid, transient increases in wind speed. Ohm's law

Explanation:

Gusts are rapid, transient increases in wind speed.

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29. Which of the following winds form when thick, cold air descends from higher heights, often mountains or polar areas?

  1. Polar easterlies
  2. Westerlies
  3. Monsoonal winds
  4. Katabatic winds

Answer: D) Katabatic winds

Explanation:

Katabatic winds form when thick, cold air descends from higher heights, often mountains or polar areas.

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30. ____ winds are chilly winds that blow from east to west.

  1. Polar easterlies
  2. Sea breezes and Land breezes
  3. Monsoonal winds
  4. Katabatic winds

Answer: A) Polar easterlies

Explanation:

Polar easterlies are chilly winds that blow from east to west.

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31. Trade winds, Polar easterlies, and westerlies are a type of ____ winds.

  1. Monsoonal winds
  2. Prevailing winds
  3. Cyclones and anticyclones
  4. Mountain/valley winds

Answer: B) Prevailing winds

Explanation:

Trade winds, Polar easterlies, and westerlies are a type of Prevailing winds.

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32. Which of the following statement is True?

  1. Higher wind speeds often result in less electricity generation
  2. Higher wind speeds often result in more electricity generation
  3. Lower wind speeds often result in more electricity generation

Answer: B) Higher wind speeds often result in more electricity generation.

Explanation:

Higher wind speeds often result in more electricity generation.

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33. The interaction of wind turbines in a wind farm is studied using ____.

  1. Load analysis
  2. Control systems
  3. Wake modelling

Answer: C) Wake modelling

Explanation:

The interaction of wind turbines in a wind farm is studied using wake modelling.

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34. Wind turbines generate no noise?

  1. True
  2. False

Answer: B) False

Explanation:

Wind turbines produce noise and can have a visual influence on the surrounding area.

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35. Which of the following is True about wind energy plant installation?

  1. wind energy plant installation causes soil erosion
  2. wind energy plant installation causes habitat destruction
  3. wind energy plant installation causes disturbance of the ecosystem
  4. All of the above

Answer: D) All of the above

Explanation:

wind energy plant installation can lead to soil erosion, habitat destruction, and disturbance of the ecosystem.

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36. Is it possible to convert saline or brackish water into fresh water using wind power?

  1. Yes
  2. No

Answer: A) Yes

Explanation:

It is possible to convert saline or brackish water into fresh water using wind power.

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37. Which of the following acts as a protective cover for the wind turbine's generator, gearbox, and so on?

  1. Main shaft
  2. Hub
  3. Nacelle
  4. Rotor blades

Answer: C) Nacelle

Explanation:

Nacelle acts as a protective cover for the wind turbine's generator, gearbox, and so on.

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38. Which of the following is used in wind turbines to boost the rotating speed of the rotor shaft to a level adequate for effective energy generation?

  1. Gearbox
  2. Main shaft
  3. Generator
  4. Rotor blades

Answer: A) Gearbox

Explanation:

A gearbox is used in wind turbines to boost the rotating speed of the rotor shaft to a level adequate for effective energy generation.

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39. Savonious Wind Turbine is a type of horizontal axis wind turbine or vertical axis wind turbine?

  1. Horizontal-axis wind turbines
  2. Vertical axis wind turbines

Answer: B) Vertical axis wind turbines

Explanation:

Savonious Wind Turbine is a type of vertical axis wind turbines.

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40. When viewed from the side, which of the following turbine is made up of two or more curved blades that form an S-shape?

  1. Darius wind turbines
  2. Savonious Wind Turbine

Answer: B) Savonious Wind Turbine

Explanation:

When viewed from the side, the Savonious Wind turbine is made up of two or more curved blades that form an S-shape.

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41. Which of the following is a thermal breakdown process that produces biochar, bio-oil, and syngas from biomass?

  1. Combustion
  2. Gasification
  3. Pyrolysis
  4. Fermentation

Answer: C) Pyrolysis

Explanation:

Pyrolysis is a thermal breakdown process that produces biochar, bio-oil, and syngas from biomass.

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42. Which of the following is the most basic and extensively utilized form of biomass conversion?

  1. Anaerobic digestion
  2. Gasification
  3. Pyrolysis
  4. Direct combustion

Answer: D) Direct combustion

Explanation:

The most basic and extensively utilized form of biomass conversion is direct combustion.

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43. ____ is a form of biomass combustion in which a stationary bed is used to burn the fuel.

  1. Fluid bed combustion
  2. Fixed bed combustion
  3. Burner combustion
  4. Moving bed combustion

Answer: B) Fixed bed combustion

Explanation:

Fixed bed combustion is a form of biomass combustion in which a stationary bed is used to burn the fuel.

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44. Which of the following is True about higher heating value (HVV)?

  1. Higher Heating Value (HHV) is the total heat emitted when a fuel is entirely burnt, excluding the latent heat of water vaporization in the combustion products.
  2. Higher Heating Value (HHV) is the total heat emitted when a fuel is entirely burnt, including the latent heat of water vaporization in the combustion products

Answer: B) Higher Heating Value (HHV) is the total heat emitted when a fuel is entirely burnt, including the latent heat of water vaporization in the combustion products.

Explanation:

Higher Heating Value (HHV) is the total heat emitted when a fuel is entirely burnt, including the latent heat of water vaporization in the combustion products.

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45. Is the presence of oxygen required for biomass conversion processes?

  1. Yes
  2. No

Answer: A) Yes

Explanation:

For biomass conversion processes that include combustion or oxidative reactions, the presence of oxygen is often essential.

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46. Longer residence times of biomass have the potential to ____ gasification efficiency.

  1. Improve
  2. Worsen
  3. No effect

Answer: A) Improve

Explanation:

Longer residence times have the potential to improve gasification efficiency.

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47. Is water produced as a by-product of biomass gasification??

  1. Yes
  2. No

Answer: B) No

Explanation:

No, water is not a by-product of biomass gasification.

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48. Which of the following is a by-product of biomass gasification?

  1. Ash
  2. Tar
  3. Char
  4. All of the above

Answer: D) All of the above

Explanation:

Ash, tar, char, etc are the by-products of biomass gasification.

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49. The moisture content naturally contained inside the biomass material is referred to as ____ moisture.

  1. Inherent moisture
  2. Extrinsic moisture

Answer: A) Inherent moisture

Explanation:

The moisture content naturally contained inside the biomass material is referred to as inherent moisture.

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50. ____ moisture is moisture that resides on the surface of the biomass material.

  1. Inherent moisture
  2. Extrinsic moisture

Answer: B) Extrinsic moisture

Explanation:

Extrinsic moisture is moisture that resides on the surface of the biomass material.

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51. Which of the following type of ash In a combustion chamber or gasification reactor, is the larger, heavier ash that collects at the bottom?

  1. Fly ash
  2. Bottom ash
  3. Bed ash
  4. Slag

Answer: B) Bottom ash

Explanation:

In a combustion chamber or gasification reactor, bottom ash is the larger, heavier ash that collects at the bottom.

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52. Which of the following biomass resources includes logs, branches, sawdust, etc?

  1. Agriculture residues
  2. Energy crops
  3. Municipal solid waste
  4. Wood and wood residue

Answer: D) Wood and wood residue

Explanation:

Wood and wood residue biomass resources include logs, branches, sawdust, etc.

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53. Is water necessary in the geothermal project?

  1. Yes
  2. No

Answer: A) Yes

Explanation:

Water is often required in geothermal projects to extract heat from the reservoir and create steam.

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