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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.

  0.573.
 0.649.
 0.512.
 0.443.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

None of these
  stator phases of the motor.
  starting resistance in the starter.
  rotor at slip rings.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt= Ea– Iara

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 1/2 of the initial value
 4 time the initial value
 twice the initial value

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
  about 75°.
 90°.
 0°.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Decreasing the field current.
 Increasing the armature current.
 Increasing the field current.
 Increasing the field current.

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