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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  8.
  2.
 6.
 4.

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Electrical Machines
DC machine is a

 conduction machine.
 both are correct.
 convection machine.
 none of above are correct.

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Electrical Machines
The commutator segments of DC machines are made up of

 copper
 copper alloy
 brass
 hard-drawn copper

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and low voltage
 low current and high voltage
 high current and high voltage
 low current and low voltage

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are parallel.
  Armature and field both are in series with the load.
 Armature and field both are connected.
 Armature winding is in series with load.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1450.
 1440.
 1500.

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