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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 DC
 AC
 AC and DC

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Electrical Machines
The armature shaft must be able to with stand

 Any unbalanced magnetic pull on the armature core.
 Twisting stains due to transmission of torque.
All of these
 Bending moment due to weight of the armature.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 less magnetic core loss.
  no magnetic core loss.
 more magnetic core loss.
  more copper loss.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

  hum.
 boo.
 zoom.
 magnetostriction.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 74 Nm.
 38.5 Nm.
  65.8 Nm.
 27.73 Nm .

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 synchronous speed.
 slip speed.
 normal speed.

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MORE MCQ ON Electrical Machines

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