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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/3
 1/√3

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Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  rectangular.
  pulsating.
  sinusoidal.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 0 KVA
 6 KVA
 10 KVA
 4 KVA

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Electrical Machines
Short circuiting is caused in the armature winding due to

  failure of insulation between two turns of coil.
  grounding of two or more turns of the same coil.
 failure of insulation between two commutator bars.
  any of above.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

None of these
 remains constant.
 increase.
 decrease.

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

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

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MORE MCQ ON Electrical Machines

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