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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 50Hz
 2HZ
 1 Hz

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 generation of voltage
 electromechanical energy conversion
 development of torque

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 AC single phase motor.
 Induction motor.
 Synchronous motor.

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Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Coupling mounted on the shaft.
 Armature.
 Field.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing all the three leads from the supply.
  transposing any two leads from supply.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 decreases
None of these
 remains unaffected
 increases

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