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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 440 A.
 44 A.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  crawling.
  slip.
  cogging.
  skewing.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.6 kW, 12 kW.
  6.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.
 9.3 kW, 9.3 kW.

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Electrical Machines
Induction motors provided with open slots have

  more breakdown torque.
  leading power factor.
  higher efficiency.
  less breakdown torque.

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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

 remain the same
 decrease
 increase
 become zero

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

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

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