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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
None of these
 either GNA or MNA

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Electrical Machines
On what factors the speed of dc motor depends?

 Armature current Ia.
 Field flux.
 Applied voltage.
 All of these.

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Electrical Machines
From no load to full load the slip will

None of these
 slightly decrease.
 slightly increase.
 not change.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
  60 Hz.
 0.70 Hz.
 0.75 Hz.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cos2δ
 sin2δ
 sinδ
 cosδ

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 reduced starting torque.
  a large starting torque.
 higher efficiency.
 low noise.

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MORE MCQ ON Electrical Machines

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