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Electrical Machines

Electrical Machines
Eddy current loss will depends on

All of these
 Frequency
 Thickness
 Flux density

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Electrical Machines
In a DC Motor 3 point starter is used to

 limit the starting current to a safer value.
 provide overload protection.
 all of above.
 provide protection against Low-Voltage.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.
 Magnetic neutral armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  magnetising.
  none of above.
  crossmagnetising.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1130 r.p.m.
 963.8 r.p.m.
 4575.4 r.p.m.
 1037.5 r.p.m.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sp²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²

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