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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
  E = V + IaRa.
 E = V + Ia.
 E = V + Ra.

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC shunt and level Compound motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 2500 W
 3200 W and 5200 W
 1600 W and 5000 W
 1600 W and 1250 W

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 differential compound.
 cumulative compound.
 shunt.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Series.
 Differential compound.
  Shunt.
 Cummulative compound.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.
 either of these.

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