Question 61 : Calculate the air density when 18m/s wind is at 1std atmospheric pressure and 34^oC?
1. 1.149 kg/m³
2. 1.9 kg/m³
3. 2.88 kg/m³
4. 5.89 kg/m³
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Question 62 : When did the development of wind power in India began?
1. 1965
2. 1954
3. 1990
4. 1985
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Question 63 : What is the inherent weakness of all wind machines?
1. Their efficiencies
2. Requires powerful winds to make fan rotate
3. Their dependency on the wind speed
4. Cannot be easily repaired
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Question 64 : What does Heating and cooling of the atmosphere generates?
1. Thermo line circulation
2. Radiation currents
3. Convection currents
4. Conduction currents
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Question 65 : The fraction of time during a given period that the turbine is actually on line is called?
1. Availability factor
2. Flat rating
3. Cut in velocity
4. Cut out velocity
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