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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 50 Hz
 100 Hz
 25 Hz

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Electrical Machines
The output power of any electrical motor is taken from the

 Field.
 Coupling mounted on the shaft.
 Motor frame.
 Armature.

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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

 0.62.
 0.25.
 1.24.
 0.72.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
 0.1 µF.
  1 - 2 µF.
  2 - 3 µF.

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Single phase IM.
  Squirrel cage IM.
  Slip ring IM.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 either increase or decrease
 increase
 decrease
None of these

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