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In turbo-alternators, smooth cylindrical type rotors used have long axial length because | |
A. | it gives smooth running of the rotor [Wrong Answer] |
B. | it reduces windage loss [Wrong Answer] |
C. | centrifugal force is reduced [Wrong Answer] |
D. | number of armature conductors being less, they have to be necessarily long for generating the required voltage [Correct Answer] |