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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  DOL.
  both A and B.
None of these
  star delta.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature current will drop
 armature will oscillate about original speed as the mean speed
 motor will attain dangerously high speed
 motor will become slow.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 KefKf2Bm2.
 Kef2KfBm2.
  Kef2Kf2Bm2.
 Kef2Kf2Bm.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 cumulatively compounded generator
 series generator
 shunt generator
 differentially compounded generator

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of starting winding.
All of these
 reversing the terminals of main winding.
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
Maximum power developed depends on

 load angle
 reactance
 voltage
 both 1and 2

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