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

 1, 3, 5
 2, 3 , 5
 1, 4
 2, 4 ,5

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Electrical Machines
In a stepper motor the detente torque means

  maximum of the static torque with the phase winding unexcited.
  minimum of the static torque with the phase winding unexcited.
  maximum of the static torque with the phase winding excited.
  minimum of the static torque with the phase winding excited.

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 both the windings have thin leads
 both the windings have thick leads
 armature winding has thick leads whereas field winding has thin leads
 armature winding has thin leads whereas field winding has thick leads

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