Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Capacitor start.
  Split phase.
  Shaded pole.

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 changes to 0.5 times the original value
 changes to three times the original value
 changes to 1.5 times the original value
 remain the same as the original

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Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

 increase to a value greater than 1.25 times 220 V
 increase to value lying between 220 V and 1.25 times 220 V
 increase to 1.25 times 220 V
 not change and remain at 220 V

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