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Electrical Machines

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

 V²
 f
 V
 f²

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 supply voltage and field current at constant excitation
 power factor and dc excitation at constant load
 power factor and supply voltage during hunting
All of these

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Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 demagnetization
All of these
 cross magnetization

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 10 volts.
 20 volts.
 30 volts.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Synchronous motor.
  Slip ring IM.
  Double cage motor.
  Squirrel cage IM.

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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 1250 W
 1600 W and 5000 W

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