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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor start
 Capacitor run

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 3
 1 and 2
 2 alone
 1, 2 and 3

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Electrical Machines
Wave winding is employed in DC machine of

  low current and high voltage rating.
 high current and low voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  all of below.
  locking tendency is reduced.
  uniform torque.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 Both B and C.
 Permanent magnets.
 None of the options.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 severe sparking.
 rough commutator surface.
 any of above.

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