Question

1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the developed...

1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the developed torque for an armature current of 25A.

2) Draw and explain all characteristics of d.c. Shunt motor.

3) State accessitivity of 3 point starter.

4) A four pole wave connected dc armature has 50 slots with 10 conductors per slot. The armature is rotated at 1000 rpm of the useful flux per pole is 30mwb, calculate the amount of EMF induced.

5) A 6 pole lap wound shunt motor has 600 conductors in the armature. The resistance of the armature and field winding is 0.2 ohm and 55 ohms respectively. The flux per pole is 25mwb. Find the speed of the motor, when it takes 100 A from dc motor of 220 V supply.

6) Draw and explain all characteristics of dc series motor.

7) Explain the significance of back emf.

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