Multiple Choice Questions (MCQs) on Wind Power Plant
Q1. What is the primary function of a wind turbine in a wind power plant?
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q2. Which component in a wind power plant converts mechanical energy into electrical energy?
- Yaw Drive
- Controller
- Generator
- Blades
Answer: Option C
Explanation: The generator converts mechanical energy into electrical energy.
Q3. What is the theoretical maximum efficiency of a wind turbine, known as the Betz Limit?
- 50%
- 59.3%
- 65%
- 70%
Answer: Option B
Explanation: The Betz Limit defines the maximum theoretical efficiency of a wind turbine at 59.3%.
Q4. Which type of wind turbine is most commonly used in large-scale wind farms?
- Vertical Axis Wind Turbines (VAWT)
- Horizontal Axis Wind Turbines (HAWT)
- Oscillating Turbines
- Hybrid Wind Turbines
Answer: Option B
Explanation: Horizontal Axis Wind Turbines (HAWT) are preferred for large-scale wind farms due to their efficiency.
Q5. What does the yaw drive in a wind turbine do?
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q6. What is the primary function of a wind turbine in a wind power plant? (Variant 6)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q7. Which component in a wind power plant converts mechanical energy into electrical energy? (Variant 7)
- Yaw Drive
- Controller
- Generator
- Blades
Answer: Option C
Explanation: The generator converts mechanical energy into electrical energy.
Q8. What does the yaw drive in a wind turbine do? (Variant 8)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q9. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 9)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q10. What does the yaw drive in a wind turbine do? (Variant 10)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q11. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 11)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q12. What is the primary function of a wind turbine in a wind power plant? (Variant 6) (Variant 12)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q13. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 9) (Variant 13)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q14. What is the primary function of a wind turbine in a wind power plant? (Variant 6) (Variant 12) (Variant 14)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q15. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 11) (Variant 15)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q16. What is the theoretical maximum efficiency of a wind turbine, known as the Betz Limit? (Variant 16)
- 50%
- 59.3%
- 65%
- 70%
Answer: Option B
Explanation: The Betz Limit defines the maximum theoretical efficiency of a wind turbine at 59.3%.
Q17. What is the primary function of a wind turbine in a wind power plant? (Variant 6) (Variant 12) (Variant 17)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q18. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 9) (Variant 13) (Variant 18)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q19. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 11) (Variant 15) (Variant 19)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q20. What is the primary function of a wind turbine in a wind power plant? (Variant 6) (Variant 20)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q21. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 11) (Variant 15) (Variant 19) (Variant 21)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q22. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 9) (Variant 13) (Variant 22)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q23. What does the yaw drive in a wind turbine do? (Variant 10) (Variant 23)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q24. What is the primary function of a wind turbine in a wind power plant? (Variant 6) (Variant 12) (Variant 14) (Variant 24)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q25. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 25)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q26. What is the primary function of a wind turbine in a wind power plant? (Variant 26)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q27. What is the theoretical maximum efficiency of a wind turbine, known as the Betz Limit? (Variant 27)
- 50%
- 59.3%
- 65%
- 70%
Answer: Option B
Explanation: The Betz Limit defines the maximum theoretical efficiency of a wind turbine at 59.3%.
Q28. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 9) (Variant 28)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
Q29. What is the primary function of a wind turbine in a wind power plant? (Variant 29)
- To store wind energy for later use
- To convert wind energy into mechanical energy
- To absorb sunlight and convert it into electricity
- To cool down the generator during operation
Answer: Option B
Explanation: Wind turbines convert the kinetic energy of the wind into mechanical energy.
Q30. What does the yaw drive in a wind turbine do? (Variant 8) (Variant 9) (Variant 30)
- It stores electrical energy
- It measures wind direction
- It rotates the nacelle to face the wind
- It adjusts the blade pitch
Answer: Option C
Explanation: The yaw drive rotates the nacelle to align the turbine with the wind direction.
SSC JE Previous Year Questions with Answer on Wind Power Plant
Q1. What is one of the key advantages of wind energy?
(A) High initial cost(B) Intermittency of wind
(C) Renewable and clean energy source
(D) Requires large land area
Answer: (C) Renewable and clean energy source
Explanation: Wind energy is considered a renewable resource since it is naturally replenished. It is also environmentally friendly, as it does not emit greenhouse gases during operation. Despite the high initial installation cost and wind variability, its sustainable and clean nature makes it a major advantage.
Q2. How does a wind turbine primarily generate electricity?
(A) By converting solar radiation into electricity(B) By converting the kinetic energy of wind into mechanical energy, which drives a generator
(C) By using geothermal heat to create steam and turn a turbine
(D) By directly converting chemical energy in wind into electricity
Answer: (B) By converting the kinetic energy of wind into mechanical energy, which drives a generator
Explanation: The turbine blades capture kinetic energy from the wind and rotate. This mechanical motion is transferred to a generator, which then converts it into electrical energy.
Q3. What is the typical cut-in wind speed for a wind turbine to start generating power?
(A) 2–4 km/h(B) 6–8 km/h
(C) 11–16 km/h
(D) 20–25 km/h
Answer: (C) 11–16 km/h
Explanation: The cut-in speed refers to the minimum wind speed at which the wind turbine begins generating power. For most commercial turbines, this speed ranges between 11 to 16 kilometers per hour.
Q4. Which of the following is not a basic component of a wind power system?
(A) Tower(B) Rotor
(C) Shaft
(D) Heat exchanger
Answer: (D) Heat exchanger
Explanation: Wind turbines include components like the tower, rotor, and shaft for mechanical energy transfer. A heat exchanger, however, is used in thermal power systems, not in wind energy systems.
Q5. Why is a synchronous generator preferred over an induction generator in large wind farms?
(A) It provides higher starting torque(B) It operates efficiently at variable speeds
(C) It can supply reactive power to the grid
(D) It is more cost-effective
Answer: (C) It can supply reactive power to the grid
Explanation: Synchronous generators can provide reactive power, which supports voltage stability in the grid. This feature makes them ideal for grid-connected wind farms, despite being more complex and expensive than induction generators.
Q6. What is the function of yaw control in a wind turbine?
(A) Adjusts blade pitch(B) Aligns the rotor with the wind direction
(C) Regulates rotor speed
(D) Controls generator output
Answer: (B) Aligns the rotor with the wind direction
Explanation: Yaw control rotates the nacelle so that the blades face the wind direction, ensuring maximum energy capture. This alignment is crucial for efficient turbine operation.
Q7. Which of the following is a limitation of wind power?
(A) Low operating cost(B) Clean energy source
(C) Intermittency of wind
(D) Renewable energy source
Answer: (C) Intermittency of wind
Explanation: Wind energy is dependent on wind availability, which can vary throughout the day and season. This unpredictability can make power supply inconsistent, requiring backup systems or energy storage.
Q8. What is the role of the gearbox in a wind turbine?
(A) To increase the voltage of the generated electricity(B) To reduce rotor speed for the generator
(C) To increase rotor speed to match the generator’s operational speed
(D) To convert DC power to AC
Answer: (C) To increase rotor speed to match the generator’s operational speed
Explanation: The blades of wind turbines rotate slowly, but generators require higher rotational speeds to produce electricity efficiently. The gearbox steps up the low-speed rotation of the blades to match the generator’s speed requirements.