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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  load.
  speed and voltage.
 speed.

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

 cross magnetization
All of these
 demagnetization
 magnetization

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

  increase the speed of shaft rotation.
 increase the number of turns in armature coil.
 increase the source frequency.
 increase the number of turns in field coil.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Auto transformer starting.
  Direct online starting.
  Stator resistance starting.
  Rotor resistance starting.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  R2 = sX2.
  sR2 = X2.
  R2 = s2X2.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  cogging.
  harmonics.
  crawling.

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