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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  60 Hz.
  16.67 Hz.
  25 Hz.

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Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
 E = V + Ra.
  E = V + IaRa.
 E = V + Ia.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 4 times.
 double.
 one fourth.
 half.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 10°
 60°
 45°

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Electrical Machines
An induction motor is, in general analogous to

 auto transformer.
 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.
None of these

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