Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 970 RPM
 920 RPM
 940 RPM
 960 RPM

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Electrical Machines
In a stepper motor the detente torque means

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

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