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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

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

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero , - 50 rpm.
 1000 rpm, 950 rpm.
 1000 rpm, - 50 rpm.
 zero, 950 rpm.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Capacitor start IM.
  Split phase IM.
  Capacitor start capacitor run IM.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 remains unaffected
 any of the above
 decreases

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 development of torque.
 generation of voltage.
 commutation.
 electromechanical energy conversion.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 11.5 A.
  13.5 A.
 27 A.
 23 A.

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