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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 1920W
 1820W
 2000W

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage, load angle and excitation
 supply voltage and excitation
 supply voltage and load angle
 excitation and load angle

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 2 point starter
 3 point starter
All of these
 4 point starter

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave controlled
 full wave
 half wave controlled

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

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

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 35 Hz.
  30 Hz.
 20 Hz.
  Can be determined.

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