WIND ENERGY

Identify the diagram of Tubular Tower

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Select the demerits of Lattice tower

• High Cost

• Poor aesthetics

• not maintenance friendly

• Loads are not distributed

Identify the part which is not belongs to Rotor

• Blade

• Hub

• Gear Box

• Bearings

True or False

The high stiffness characteristic of carbon increases the possibility of blade bending in high winds and hence, they can be positioned close to the tower.

• TRUE

• FALSE

carbon-glass hybrid blades are costlier. TRUE or FALSE

• TRUE

• FALSE

TRUE OR FALSE

Speed of a typical wind turbine rotor may be 30 to 50 r/min whereas, the optimum speed of generator may be around 1000 to1500 r/min.

• TRUE

• FALSE

Select the wrong statement

• Gears are not designed on the basis of duration and distribution of loads on individual gear teeth.

• The load duration and distribution pattern (LDD), under a given

  set of wind conditions, are analysed for gear design.

• Advanced numerical simulation tools are also being used for characterizing the dynamic response of wind turbine gears

Select the statements related to Pitch Control

• The blades are to be turned about their longitudinal axis by the pitch control mechanism in tune with the variations in wind speed.

• In Pitch Control, profile of the blades is designed in such a way that when the wind velocity exceeds beyond the rated limit, the angle of attack increases

• The pitch control mechanisms are driven by a combination of hydraulic and mechanical devices.

• Pitch Control do not require any control system

Some modern turbines exploit the advantages of both the pitch and stall controlled options for regulating its power. This is called the ________________

• Active stall controlled power regulation

• Bi-stall Controlled power regulation

• Pitch- stall controlled power regulation

Two types of brakes are commonly used with wind turbines. They are ___________ and _____________

• Aerodynamic brakes

• Hydraulic Brakes

• Mechanical brakes

• Pressure Fluid Braking System