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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Transformer core is laminated to reduce

 eddy current loss.
 hysteresis loss.
 both 1 and 2.
 copper loss.

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Electrical Machines
The rotor speed of an induction motor is given by

  Nr = 120f / p × (1-s).
None of these
  Ns = 120f / p × ( 1 - s ).
  Ns = 120f /p × ( 1 - r).

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the inter polar axis.
 commutator in the polar axis.
 armature in the polar axis.
 armature midway between poles.

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

  1.2.
 1.4.
 1.8.
 1.5.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

None of these
 not changed
 decrease
 increase

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MORE MCQ ON Electrical Machines

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