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Electrical Machines

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

  2 Hz.
  3 Hz.
 10 Hz.
 50 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

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

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

  Shunt.
 Cummulative compound.
 Series.
 Differential compound.

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Electrical Machines
The overall power factor of an on load transformer

  depends on the power factor of the load.
 is always leading.
 is always unity.
 is always lagging.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

All of these
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of main winding.
 reversing the terminals of starting winding.

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

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

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