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Automatic Control Systems - Engineering

Q1:

Which of the following rotors are used in two phase ac servomotor?
  1. Solid iron rotor
  2. Squirrel cage rotor
  3. Drag cup rotor
Of the above the correct ones are

A 1,2,3

B 1,2

C 2,3

D 1,3

ANS:C - 2,3

Solid iron rotor would give rise to eddy currents.