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

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP