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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
What are slot wedges in a DC machine made of?

 Silicon steel.
 Mild steel.
 Cast iron.
 Fibre.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 zero.
 proportional to square of rotor speed.
 constant independent of speed.

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

 draw too much current.
 produce sparking at brushes.
 develop excessive speed and damage itself.
 open fuse or circuit breaker.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 1000W
 500W
 100W

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
 It will remain the same.
  It will be halved.
  It will becomes four times.

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