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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
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3000 rpm.
 3600 rpm.
  600 rpm.
 500 rpm.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at normal speed.
 burn.
 run at lower speed.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 normal speed.
 more than normal speed.
 zero.
 less than normal speed.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 reduced starting torque.
 higher efficiency.
 low noise.
  a large starting 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

 decrease
 remain the same
 become zero
 increase

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