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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

 100 ohm.
 50 ohm.
  0.5 ohm.
  0.1 ohm.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thick
 large and thin

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 dc shunt motor.
 synchronous motor.
 slip ring induction motor.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  500 rpm.
  3000 rpm.
  600 rpm.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

None of these
  rotor at slip rings.
  starting resistance in the starter.
  stator phases of the motor.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 remain the same
 decrease
 increase

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