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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 2000 rpm
 500 rpm
 250 rpm

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.72.
 0.62.
 0.25.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of rotor resistance.
  Change of number of pole.
  Change of supply frequency.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 deteriorate and the speed rises.
 improve and the speed rises.
 deteriorate and the speed falls.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 damage the armature and commutator.
 draw a starting current many times its rated full load current.
 provide execessive voltage drop in line.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.
  P = 60, s = 0.96 %.
  P = 50, s = 4.43 %.

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