Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.72.
 0.62.
 0.25.

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Electrical Machines
An ideal synchronous motor has no starting torque because

 relative velocity between the stator and rotor mmf’s is zero.
 rotor is made up of salient poles.
 rotor winding is highly reactive.
  relative velocity between stator and rotor mmf’s is not zero.

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