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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 72°
 36°
 30°

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.5+j5.8 ohms
 53+j85 ohms
 8+j13 ohms
 3.05+j5.08 ohms

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Electrical Machines
Commutators in DC machines have a role of which converts

 none of these.
 AC to DC.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
 lagging power factor.
 unity power factor.
None of these

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
  340 A.
 570 A.
  460 A.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are parallel.
 Armature winding is in series with load.
  Armature and field both are in series with the load.
 Armature and field both are connected.

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