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Electrical Machines

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/120.
 PN/60.
 PN/2.
 PN/3000.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and direct axis
 direct axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and interpolar axis

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole winding
 armature winding
 interpole and compensating windings together
 field winding

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
None of these
 both 1 and 2

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  25 Hz.
  60 Hz.
  16.67 Hz.

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