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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  zero.
  220 V.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 2, 3, 4
 1, 3, 5
 1, 2, 3, 4

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 double the supply voltage.
 half of the supply voltage.
All of these

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 40 volts.
 20 volts.
 30 volts.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  none of these.
  eliminate noise.
  facilitate cooling of rotor.
  balance the rotor dynamically.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 non-sinusoidal nature of armature mmf
 magnetic saturation in half of the field pole
 component of armature mmf along field axis

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