Determine the minimum diameter of the rotor required to generate 500kW of wind energy for a standard wind turbine. Assume the average wind speed of the site is 12 m/s and the power coefficient of the turbine is 0.4.

The theoretical maximum efficiency of wind turbines is limited by the velocity of air leaving the turbine preventing air from entering the turbine.     TRUE OR FALSE?

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If the load is connected to the generator thgrough an inductive line and the voltage at the load side is the same as the voltage at the terminals of the generator, which of the following must be true? O A. The reactive power is flowing from the generator to the load and from load to the generator at the same time. O B. The load is disconnected, and no power is delivered to the load. O C. The load has a poor power factor and it's absorbing too much reactive power. O D. None of the other choices are correct O E. The generator is unable to produce reactive power; therefore, the reactive power is flowing from the load to the generator.

A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle 8 (b) Reactive power drawn by the load Carry out calculations in pu form and convert the result to actual values.

a) To increase the output of an ac generator, a student has the choice of doubling either the generator's magnetic field or its frequency. To maximize the increse in emf output, A - he should double the magentic field.B - he should double the frequency.C - it does not matter which one he doubles. b) Two students display their ac generators at a science fair. The generator made by Student A has a loop area of 100 cm22 rotating in a magnetic field of 20 mT at at 60 Hz. The generator made by Student B has a loop area of 75 cm22 rotating in a magnetic field of 200 mT at at 120 Hz. Calculate the emf of the two generators. Student A: Student B:

A 6-pole DC generator with 157 slots and with 2 coil per slot, simplex wave, find the parallel path.