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Electrical Machines

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

 speed.
  voltage.
  load.
  speed and voltage.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = ωm
 ωe = 2*ωm
 ωe = 1/2*ωm

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Electrical Machines
A compound motor has

  tertiary winding.
  both shunt and series field winding.
  only shunt field winding.
  only series field winding.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Shaded pole.
  Split phase.
  Capacitor start.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 series motor
 comulatively compounded motor
 permanent magnet motor

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