Multiple Choice Questions (MCQ) on Wind Energy
12-The wind speed is measured using an instrument called
(A) Pyranometer
(B) Manometer
(C) Anemometer
(D) Wind vane
13-The rate of change of wind speed with height is called
(A) Wind shear
(B) Wind rose
(C) Wind solidity
(D) None of the above
14-At gradient height the shear force is
(A) Zero
(B) Minimum
(C) Maximum
(D) None of the above
15-The gradient height is about _____ m from the ground.
(A) 500
(B) 1000
(C) 1500
(D) 2000
16-The atmosphere with uniform wind speed is called the ____ atmosphere
(A) Plain
(B) Surface
(C) Free
(D) Shear
17-Surface layer is the air layer considered from the height of local obstruction to a height of about
(A) 50m
(B) 100m
(C) 150m
(D) 200m
18-Air layer from 100m that extends up to the gradient height is known as
(A) Surface layer
(B) Ekman layer
(C) Boundary layer
(D) None of the above
19-Low solidity rotors use which of the following force for rotation
(A) Drag
(B) Lift
(C) Centrifugal
(D) Centripetal
20-The following is the tangential velocity of the blade due to the rotation of blade.
(A) Wind velocity
(B) Incident wind velocity
(C) Blade linear velocity
(D) Relative velocity
21-Turbines blades have ____ type cross section to extract energy from wind.
(A) Aerofoil
(B) Elliptical
(C) Rectangular
(D) All of the above
22-The Nacelle of windmill houses
(A) Gearbox
(B) Brakes
(C) Generator
(D) All of the above
ANSWERS:
12-(C), 13-(A), 14-(A), 15-(D), 16-(C), 17-(B), 18-(B), 19-(B), 20-(C), 21-(A), 22-(D)