Question 51 : Why severe fluctuations in power are always undesirable in windmill?
1. Because they pose power oscillations problems
2. Damage of parts due to fluctuations
3. The efficiency of the plant will be reduced
4. Results in damage to the whole plant
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Question 52 : What is the main source for the formation of wind?
1. Uneven land
2. Sun
3. Vegetation
4. Seasons
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Question 53 : In which of the following, does machine rotor drives through a step up gear box?
1. Horizontal axis with two aerodynamic blades
2. Horizontal axis propeller type wind mill
3. Horizontal axis multi bladed type wind mill
4. Sail type wind mill
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Question 54 : Which type of wind machines are used at several residence or local use?
1. Large size machines
2. Remote machines
3. Small size machines
4. Medium size machines
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Question 55 : Which windmill blades are made by an array of wooden slats?
1. In which of the following, does machine rotor drives through a step up gear box?
1. Horizontal axis with two aerodynamic blades
2. Horizontal axis propeller type wind mill
3. Horizontal axis multi bladed type wind mill
4. Horizontal axis wind mill Dutch type
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Question 56 : Which type of wind turbines produce 100 kW or greater?
1. Large machines
2. Small machines
3. Medium machines
4. Remote Machines
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Question 57 : The rotor blades are continuously flexed by unsteady aerodynamic gravitational and inertia loads?
1. True
2. False
3.
4.
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Question 58 : How much is the energy available in the winds over the earth surface is estimated to be?
1. 2.9 X 120 MW
2. 1.6 X 107 MW
3. 1 MW
4. 5MW
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Question 59 : Aero turbine is the fraction of power in the wind through the swept area which is converted into useful mechanical shaft power is called _____________
1. Coefficient of performance
2. Coefficient of variation
3. Coefficient of lift
4. Coefficient of spin
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Question 60 : Why is wind turbine designed to stop operation at cut out velocity?
1. To protect wheel against damage
2. To make a quick stop in emergencies
3. To improve the efficiency
4. In order to adjust the blades to wind direction
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