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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
  0.573.
 0.512.
 0.649.

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Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 both A and B
 flux(φ)
 armature current(Ia)

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Draw too much current.
  Develop excessive speed and damage itself.
 Open fuse or circuit breaker.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
 Synchronous speed
None of these
 Slip speed

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 interchanging the capacitor from starting winding to main winding or vice versa.
All of these
 reversing the terminals of main winding.
 reversing the terminals of starting winding.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

All of these
  number of turns in coil.
  flux per pole.
  frequency of waveform.

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