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Electrical Machines

Electrical Machines
Transformer core is laminated to reduce

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

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 100 W, 2000 W.
  3190 W, 5040 W.
 1000 W, 5040 W.
 6000 W, 7000 W.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%
None of these

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 Compounded DC generator.
 DC series generator.
 None of these.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 both eddy current and hysteresis loss.
 eddy current loss.
  hysteresis loss.
 ohmic loss.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos (α/2)
 sin (α/2)
 Cos α²

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