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Electrical Machines

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

 demagnetization
 magnetization
All of these
 cross magnetization

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Electrical Machines
In an auto-transformer, power is transferred through

 both A and B.
 conduction process only.
 induction process only.
None of these

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Electrical Machines
In shapers and slotters which motor are preferred?

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

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator field terminal.
 motor field terminal.
 generator armature terminal.
 motor armature terminal.

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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.
 30 volts.
 20 volts.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole winding
 interpole and compensating windings together
 armature winding

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