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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 36°
 18°
 30°

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Electrical Machines
Generators work on the principle of production of

 dynamically and statically induced emf.
 statically induced emf.
 dynamically induced emf.
None of these

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 two.
 six.
 four.

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Electrical Machines
The three point starter is used for

  Shunt motor.
  Series motor.
  Shunt motor as well as compound motors.
  Shunt, compound and series motor.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 1, 3
 2, 3
 2, 4
 1, 4

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.

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