Question 21 : What form of force acts on the blades of Darrieus machine?
1. Pure tension
2. Compression
3. Shear force
4. Air resistance force
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Question 22 : Which part of the wind mill acts as a housing for the turbine?
1. Wind Vane
2. Shaft
3. Wind mill head
4. Turbine
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Question 23 : Turbines with how many propellers are used in order to avoid vibrations?
1. 1
2. 2
3. 3
4. 4
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Question 24 : In which wind measuring device a tubular piece of thin flexible fabric hanged vertically to determine direction?
1. Wind socks
2. Weather vane
3. Pin wheels
4. Anemometers
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Question 25 : What type of energy is wind energy?
1. Renewable energy
2. Non-renewable energy
3. Conventional energy
4. Commercial energy
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Question 26 : How much power does the small scale wind machine generate?
1. 18 KW
2. 2 KW
3. 12 KW
4. 30 KW
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Question 27 : With upto how many propellers can windmills are built?
1. 4
2. 2
3. 7
4. 6
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Question 28 : At what range of speed is the electricity from the wind turbine is generated?
1. 100 - 125 mph
2. 450 - 650 mph
3. 250 - 450 mph
4. 30-35 mph
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Question 29 : Why recommendation of fixed ratio gears done for top mounted equipment?
1. Because they are easy install
2. Requires less space
3. Due to its low cost
4. Because of their high efficiency
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Question 30 : Name the type of windmill which consists of a sloping, horizontally weather boarded or thatched tower.
1. Post mill
2. Smock mill
3. Tower mill
4. Fan mill
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