Electrical Machines
Which of these types of motor is self starting?

  None of these.
  Poly-phase induction motor.
  Poly-phase synchronous machine.
  Single phase induction motor.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed but armature currnet remains the same.
 increase in speed demanding more armature current.
 decrease in speed demanding less armature current.
 decrease in speed but armature current remains the same.

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Electrical Machines
In a step down transformer which one of the following statements is true?

 Secondary power is less than primary power.
 Secondary current is less than primary current.
  Number of secondary turns is less than primary turns.
 Number of secondary turns is more than that of primary.

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