Explanation: For high speed prime movers, if salient pole construction is used, the rotor structure may not be able to withstand the enormous centrifugal forces, developed by the salient poles. Therefore, cylindrical rotor construction is best suited from mechanical considerations. 3. Commercially, which of the following generators is called turbo-alternators or turbo-generators?
A. salient pole rotor synchronous generators
B. cylindrical pole rotor induction generators
C. salient pole rotor induction generators
D. cylindrical rotor synchronous generators
Answer:A
Explanation: For high speed prime movers, if salient pole construction is used, the rotor structure may not be able to withstand the enormous centrifugal forces, developed by the salient poles. Therefore, cylindrical rotor construction is best suited from mechanical considerations. 3. Commercially, which of the following generators is called turbo-alternators or turbo-generators?
A. salient pole rotor synchronous generators B. cylindrical pole rotor induction generators C. salient pole rotor induction generators D. cylindrical rotor synchronous generators
Explanation: Cylindrical rotor synchronous generators are used commercially at high speed, driven by steam and gas turbines. 4. For relatively large sizes of synchronous machines, which of the following are used for providing closed circuit cooling?