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Electrical Machines

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

 30°
 45°
 10°
 60°

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Stator winding.
  Rotor winding.
  Rotor mmf wave.
  Both rotor and stator winding.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Capacitor start capacitor run motor
All of these
 Resistance split phase motor

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a dc machine.
 rotor of an synchronous machine.
 stator of a induction machine.
 rotor of a dc machine.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat more than 230 V
 6 V
 somewhat less than 230 V
 230 V

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 234.76 N-m.
 133.22 N-m
 can not be determined.
 266.20 N-m.

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