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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Star - delta
 Star - star
 Delta - star

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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

 become zero
 remain the same
 increase
 decrease

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Normal.
 Very high.
 Zero.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 300 V.
 200 V.
  223.V.
 150 V.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 steel core in transformer.
 winding of transformer.
 iron made tank of transformer.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 high filed circuit resistance.
 over load.
 all of these.
 zero or very low voltage supply.

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