The winding data for three different alternators are as follows I. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 III. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are O a. I, II and III. O b.I and III only O c. I and II only O d. II and III only

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Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.