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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
 not changed
None of these

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 2
 4
 1

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Permanent magnets.
 None of the options.
 Both B and C.
  Electromagnets.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = f1kw1 / f2kw2.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 3.2% and -1.6%
 4.8% and -3.2%
None of these
 6% and -4%

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf minimum
 Ra maximum and Rf maximum

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