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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 2
 3 or 4
 1

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 133.22 N-m
 234.76 N-m.
 can not be determined.
 266.20 N-m.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

None of these
 an induction motor
 a synchronous motor
 an induction generator

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 50, 1500.
 60, 1440.
 1440, 1500.
  60, 1500.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 linearised
 parabola
 any of the above

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Semi closed slot type machine.
 Open slot type machines.
 Closed slot type machines.
 Any of the above.

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