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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 power.
 torque.
 current.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 eddy-current loss
 mechanical loss
 hysteresis loss
 temperature rise

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Electrical Machines
The field system of an alternator is usually excited

  230 V AC.
  250 / 250 V DC.
  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 two.
 zero.
  unity.
 infinity.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ P.
 T2 ∝ P3.
 T ∝ √P.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 150 V.
 240 V.
 220 V.
 280 V.

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