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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Starting torque.
 Speed regulation.
 Running Torque.
  Effiency.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 192 V
 96 V
 768 V

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Electrical Machines
Field weakening method is also called as-----------?

 constant torque control
 constant voltage control
 constant power control
 constant current control

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Electrical Machines
The basic function of a transformer is to change

 the frequency
 the power factor
 the level of the voltage
 the power level

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

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Eddy current loss.
 Stray loss.
 Copper loss.
 Hysteresis loss.

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