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?
A. air
B. water
C. hydrogen/helium
D. any of the mentioned
Answer:A
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?
A. air B. water C. hydrogen/helium D. any of the mentioned
Explanation: For synchronous machines of large sizes, adequate cooling arrangements must be incorporated to dissipate the heat produced by various losses. 5. In a synchronous generator, the frequency of the generated EMF depends on