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Electrical Machines

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

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

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  3 Hz.
 10 Hz.
  2 Hz.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Series shunt.
  Differentical compound.
 have an equal number of electrons and protons.
 Cummulative compound.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 Applied voltage.
 All of these.
 Field flux.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 6 V
 230 V
 somewhat more than 230 V

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Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  space harmonics produced by winding currents.
  insufficient starting torque.
  time harmonics in supply.

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