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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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

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

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
 Full load speed.
  Full load current.
 None of these.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The torque required.
 None of above.
 The speed of motor.
 The voltage across the terminals.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Capacitor run.
  Shaded pole.
  Split phase.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Synchronous speed
 Zero
None of these
 Slip speed

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