Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 50 %.
  10 %.
 15 %.
 25 %.

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Electrical Machines
In a DC machine

 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are unidirectional
 current and emf at the terminals are alternating.
 current and emf in armature are alternating.

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