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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 10 - 20 W.
 250 - 500 W.
 200 - 250 W.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Fibre.
 Cast iron.
 Mild steel.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of rotor resistance.
  Change of number of pole.
  Change of supply frequency.

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  aluminium.
  carbon.
  stainless steel.

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

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

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Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 directly as square of applied voltage
 inversely as applied voltage
 directly as applied voltage

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