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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
  flat topped.
 triangular.
  sinusoidal.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/60.
 PN/3000.
 PN/120.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  decreases.
 increases.
  increases upto a limit and then remains almost constant.
  remains constant.

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
 field winding reactance
All of these
 armature reactance and leakage reactance

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 Khf2Bm1.6.
 KhfBm3.
 KhfBm.
  KhfBm1.6.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
  increased.
 decreased.
 kept constant to certain value.

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