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Electrical Machines

Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 both 1 and 2.
 copper loss.
 eddy current loss.

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 MMf method.
 ZPF method.
 Synchronous impedance method.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
  Conveyers.
 Air compressors.
 Blowers.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
  series motor.
 AC synchronous motor.
 cummulative compound motor.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 7.
  12.
 4.
 3.

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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.
 40 V.
 60 V.
 30 V.

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