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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 33.3%
 66.3%
 57.7%

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
 increase the source frequency.
  increase the speed of shaft rotation.
 increase the number of turns in armature coil.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  permanent magnets.
  residual magnetism.
 armature reaction.
None of these

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Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Armature.
 Coupling mounted on the shaft.
 Field.

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 750.
  100.
 200.
 500.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
  voltage.
  load.
 speed.

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