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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 0 Hz
 25 Hz
 50 Hz

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque decreases
 less and maximum torque decreases
 more and maximum torque remains constant

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 AC of supply frequency.
  DC of slip frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
 DC.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 24°.
 30°.
  10°.
 45°.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv.
 Bl2v2.
 Blv2.

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

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

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MORE MCQ ON Electrical Machines

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