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Electrical Machines

Electrical Machines
Maximum power developed depends on

 reactance
 both 1and 2
 voltage
 load angle

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to achieve a stronger magnetic field.
 to avoid over heating.
 to avoid locking of the armature.

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 provide ease of fabrication.
 increase the strength of rotor bars.
 reduce the magnetic hum and locking tendency of rotor.
 decrease the amount of copper to be used.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 rectangular.
 trapezoidal.
  triangular.
 sinusoidal.

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Armature resistance.
 None of above.
 Field resistance.
 Residual magnetism of the generator.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KVA.
 Output power at the shaft.
 Power drawn in KW.

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MORE MCQ ON Electrical Machines

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