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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  none.
  both.
  larger output.
  larger bore diameter.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 twice the initial value
 1/4 of the intial value
 1/2 of the initial value
 4 time the initial value

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Electrical Machines
In an ideal DC generator the regulation is

 zero.
 high.
 low.
 positive.

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

  375 Ω.
 145 Ω.
 225 Ω.
 150 Ω.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 16.67%.
 18.25%.
 15.30%.
 14.28%.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in opposite direction.
 it will run in same direction.
 it will run in same direction by slowly.

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