Discussion
Which of the following statement is not true for a synchronous generator?
Answer: D
The statement that is not true is that a salient type rotor is used in high speed turbine driven generators.
High-speed turbo-alternators driven by steam or gas turbines run at 3000 or 1500 rpm and use smooth cylindrical (non-salient) rotors of small diameter and great length, which can withstand the centrifugal forces. Salient pole rotors, with large diameter and many poles, are used in slow-speed machines such as hydro generators.
The other statements are true: synchronous generators normally have a stationary armature and rotating field, the cores are built of laminated steel to reduce eddy current loss, and the armature winding is distributed to improve the waveform.
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