Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce hysteresis loss only.
 reduce both eddy current and hysteresis loss.
 increase the permeability.
 reduce eddy current loss only.

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Electrical Machines
In a transformer

 both OC and SC tests are conducted on LV side
 OC test is conducted on LV side and SC test is conducted on HV side
 both Oc and SC tests are conducted on HV side
 OC test is conducted on HV side and SC test is conducted on LV side

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Inserting an additional resistance in the field circuit.
 Inserting an additional resistance in the armature circuit.
 Any of above.
 Inserting resistance to armature circuit and field circuit.

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