Wind Energy (Unit-3.1_Wind Turbine Components)

Which is the largest amount of installed grid interactive renewable power capacity in India?

• Wind power
• Solar power
• Biomass power
• Small hydro power

Usual blade diameter of wind turbine is

• 25 m
• 70 m
• 100 m
• 150 m

A rotor installed in a fixed orientation with the swept area perpendicular to the predominate wind direction is called

• Nacelle
• Yaw fixed machines
• Blades
• Turbines

Which part of the wind turbines senses wind speed, wind direction, shaft speed and torque?

• Blade
• Shaft
• Rotor
• Controller

Severe fluctuations in power is undesirable in wind power plant because

• It creates power oscillations
• It damages the parts
• It reduces the efficiency
• All of the above

The amount of energy available in the wind at any instant is proportional to

• (Wind speed)1/2
• Wind speed
• (Wind speed)2
• (Wind speed)3

Wind speed suitable to operate wind turbines is

• 5-25 m/s
• 10-35 m/s
• 20-45 m/s
• 30-55 m/s

A wind turbine designed to come into operation at a minimum wind speed is called

• Cut in velocity
• Cut out velocity
• Windward
• Upwind

Why is wind turbine designed to stop operation at cut out velocity?

• To protect turbine against damage
• To make a quick stop in emergencies
• To improve the efficiency
• To adjust the blades in wind direction

Wind turbine extracts maximum power from wind, when downstream wind speed reduces to

• One third of upstream wind speed
• Half of upstream wind speed
• Two third of upstream wind speed
• Zero