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Electrical Machines

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 ___________________ generator has the poorest voltage regulation.

  over compounded.
  shunt.
  under-compounded.
  differential compounded.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  ohmic losses.
  hysteresis losses.
  mechanical losses.
  eddy current losses.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 polarities are properly connected
 KVA ratings are equal
 turn- ratios are exactly equal
 percentage impedances are equal

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

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 40 V.
 60 V.

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