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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 Both A and C.
 Induction motor.
 DC motor.
  Synchronous motor.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 230 V
 6 V
 somewhat more than 230 V

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 48.0%.
 59.2%.
 57.1%.
 88.8%.

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 no voltage.
 maximum current.
 maximum power.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 rated transformer voltage
 high frequency supply
 direct current

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Electrical Machines
Satisfactory commutation of DC machine requires

 smooth, concentric commutator properly undercut.
 brushes should smoothly run in the holders.
All of these
 brushes should be of proper grade and size.

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