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Consider the following statements: 1. Salient pole alternators have small diameters and large axial lengths. 2. Cylindrical rotor alternators have a distributed winding 3. Cylindrical rotor alternators are wound for large number of poles 4. Salient pole alternators runs at speeds slower than cylindrical rotor machines Which of the above statements are correct?

Consider the following statements: 1. Salient pole alternators have small diameters and large axial lengths. 2. Cylindrical rotor alternators have a distributed winding 3. Cylindrical rotor alternators are wound for large number of poles 4. Salient pole alternators runs at speeds slower than cylindrical rotor machines Which of the above statements are correct? Correct Answer 2 and 4 only

Non-salient pole type rotors are used in high-speed alternators having speed between 1500 rpm to 3000 rpm.

Salient pole rotors are used in low-speed devices, from 100 rpm to 1500 rpm.

Salient pole rotor

Cylindrical rotor

Large diameter and short axial length

Small diameter and long axial length

used for low-speed alternators

Used for high-speed turbo alternators

Hasprojecting poles

Has no projecting poles

Needs damper windings

Do not need damper windings

Windage loss is more

Windage loss is less

 

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