Electrical Engineering XYZ MCQs
Which of the following rotor is used in thermal power plants:
- Salient pole rotor
- Squirrel cage rotor
- Cylindrical rotor
- Any of above
Correct answer: 3. Cylindrical rotor
Explanation: The alternator used in thermal power plants is known as turbo alternator. The alternator used in such power plants is cylindrical and not salient type. Given below are two reasons for using cylindrical rotors in thermal power plants.
- Turbo alternators run at very high speeds and for such high speeds it is difficult to build a salient pole construction that is strong enough to withstand centrifugal forces.
- Salient pole rotors have large winding losses at high speeds.