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Electrical Machines

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

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

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

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

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 3 - Φ induction motor.
 Stepper motor.
  1 - Φ synchronous motor.
 DC motor.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  vibrations.
  heating of rotor.
All of these
  double frequency currents in the rotor.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Reluctance motor.
  Synchronous motors.
  Universal motor.
  Slip ring induction motor.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 open fuse or circuit breaker.
 produce sparking at brushes.
 draw too much current.
 develop excessive speed and damage itself.

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