Questions and answers for exam Preparation

MCQs

Total Questions : 192 | Page 9 of 20 pages

Question 81. Wind turbines convert wind energy to ________

mechanical energy
electrical energy
heat energy
solar energy

Discuss Question

Answer: Option A. -> mechanical energy
Answer: (a).mechanical energy

Question 82. Which theory is used to model the wind turbine?

Blade element momentum theory
Kinetic gas theory
Archimedes principle
Einstein’s theory of photoelectric effect

Discuss Question

Answer: Option A. -> Blade element momentum theory
Answer: (a).Blade element momentum theory

Question 83. What is blade element momentum theory?

It is same as blade element theory
It is same as momentum theory
It talks about the motion of a body in a given frame of reference
It is used to calculate the local forces on the propeller or blade

Discuss Question

Answer: Option D. -> It is used to calculate the local forces on the propeller or blade
Answer: (d).It is used to calculate the local forces on the propeller or blade

Question 84. Which of the following components of a wind turbine system is arranged in the order in which energy is being converted?

Blades – rotor – electric generator – shaft
Blades – rotor – shaft – electric generator
Shaft – blades – rotor – electric generator
Electric generator – blades – rotor — shaft

Discuss Question

Answer: Option B. -> Blades – rotor – shaft – electric generator
Answer: (b).Blades – rotor – shaft – electric generator

Question 85. Which of the following are commonly used commercial wind turbines?

Vertical and DFIG
Horizontal and SCIG
Horizontal and vertical
DFIG and SCIG

Discuss Question

Answer: Option C. -> Horizontal and vertical
Answer: (c).Horizontal and vertical

Question 86. What is the main advantage of a vertical axis wind turbine?

Directional and sensitive to wind turbulence
Not directional and sensitive to wind turbulence
Directional and insensitive to wind turbulence
Not directional and insensitive to wind turbulence

Discuss Question

Answer: Option D. -> Not directional and insensitive to wind turbulence
Answer: (d).Not directional and insensitive to wind turbulence

Question 87. Which of the following materials are used to make a rotor blade of a wind turbine?

Glass fibre reinforced polyester
Salt
Sugar
Plastic

Discuss Question

Answer: Option A. -> Glass fibre reinforced polyester
Answer: (a).Glass fibre reinforced polyester

Question 88. What is the main disadvantage of a vertical axis wind turbine?

Not directional and insensitive to wind turbulence
More drag than HAWTs
Less drag than HAWTs
High starting torque

Discuss Question

Answer: Option B. -> More drag than HAWTs
Answer: (b).More drag than HAWTs

Question 89. Which of the following materials can be used to make a rotor blade of a wind turbine apart from glass fibre reinforced polyester (GRP)?