In which of the following wind energy conversion system, guy wire may be required? O a. Vertical axis wind turbines 1O b. Horizontal axis wind turbines O c. Up wind turbines O d. Down wind turbines

4.a. Which of the following maintenance practices should be carried out most frequently on motive-powerbatteries?A. Replacing cable insulationB. Replacing the vent capsC. Checking the specific gravity of the electrolyteD. Checking the electrolyte level4.b. During the formation of a lead-acid battery, which of the following takes place?A. The active materials in the negative plate are converted to lead dioxide.B. Lead sponge in the negative plate is converted to lead sulfate.C. Lead sulfate in the positive plate is converted to lead dioxide.D. The active materials in the positive plate are converted to lead sulfate.

5

Two technicians are discussing an alternator with zero output. Technician A says the field circuit may have an open circuit. Technician B says the fusible link may be open from the battery to the alternator. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B