Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of starting winding.
All of these
 reversing the terminals of main winding.

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Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

 4.
 1/4.
  1/2.
 8.

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