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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V
 f²
 V²

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)1.6 × full Load.
 (Pi / Pc) × full Load.
 (Pi / Pc)2 × full Load.
  (Pi / Pc)0.5 × Full Load.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 decrease.
 be unpredictable.
 increase
 remain the same.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the shunt field
 in parallel with the series field
 in series with the series field

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 570 A.
 340 A.
 250 A.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Wave winding.
 Both wave and lap winding.
 Lap winding.

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MORE MCQ ON Electrical Machines

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