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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.443.
 0.512.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 transformer.
 generator.
 thermocouple.
 choke.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Differential compound.
 Series.
  Shunt.
 Cummulative compound.

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Electrical Machines
Hysteresis loop represents the area of

 copper loss
 total iron losses
 hysteresis loss
 eddy current loss

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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/4Sa²
 PZL/ 4Sa
 PZL/4Sp²
 PZL/4S

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag star connected.
 zig - zag delta connected.
 star connected.
  delta connected.

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