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Electrical Machines

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

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

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 eddy-current loss
 temperature rise
 mechanical loss
 hysteresis loss

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
 demagnetisation.
  none of above.
  cross-magnetization as well as demagnetization.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.02, 1.98
 0.04, 1.96
 0.04, 0.96

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Electrical Machines
To avoid formation of grooves in the commutator

  the brushes of opposite polarity should track each other.
 the brushes of same polarity should track each other.
None of these
  brush position has no effect on the commutator grooving.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing terminal voltage.
 increasing armature cooling.
  increasing armature resistance.
  increasing input power of the prime mover.

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