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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 20KVA
 0KVA
 16KVA

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 As a separate unit.
 In parallel with the armature winding.
  In series with the armature winding.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2
 (V2 - E2) / E2

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature current
 armature mmf
 armature flux
All of these

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
 both A and B
None of these

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.
 I1 = KI2.
 I1 = KI2 + Iμ.

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