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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  constant.
  maximum.
  minimum.

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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

 88.8%.
 59.2%.
 57.1%.
 48.0%.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 commutation.
 electromechanical energy conversion.
 generation of voltage.
 development of torque.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 1 : 1.
 N1 : N2.
 none.
 N12 : N22.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will attain dangerously high speed.
 the armature current will reduce.
 the motor will come to stop.
 the speed of motor will be reduced.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 0.9103 KW.
 1.644 KW.
 5.46 KW.

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