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Electrical Machines

Electrical Machines
Eddy current loss will depends on

All of these
 Flux density
 Frequency
 Thickness

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage
 supply voltage, frequency and load
 supply voltage and frequency
 supply voltage and load

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 115 V.
 200 V.
 230 V.

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 generation of voltage.
 commutation.
 electromechanical energy conversion.
 development of torque.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  capacitor run.
  shaded pole type.
  capacitor start.

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Electrical Machines
Demagnetization effects which of the following?

 reduction in main field flux
 both B and C
 reduces the terminal voltage
 commutation

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MORE MCQ ON Electrical Machines

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