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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
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 leading.
 unity.
  lagging.

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Electrical Machines
The basic function of a transformer is to change

 the level of the voltage
 the frequency
 the power factor
 the power level

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Operating speed.
 Starting torque, operating speed, full load current.
 Starting torque.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Any of above.
 Armature voltage control.
 Shunt field resistance control.

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 36°
 30°
 72°

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