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Electrical Machines

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

 72°
 30°
 18°
 36°

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 efficiency
 ratings
 leakage reactance
 per unit impedance

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 Armature flux weakens the main field flux.
 None of the options.
 Armature flux distorts the main field flux.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 240 A.
 127 A.
 173 A.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Synchronous speed
None of these
 Slip speed
 Zero

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.

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