Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  load angle is 0°.
  input power factor is unity.
  load angle is equal to internal angle θ.

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Electrical Machines
Cogging of induction motor occurs at

 high voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.

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Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

 2, 4 ,5
 2, 3 , 5
 1, 4
 1, 3, 5

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