UNIT -1

DC MACHINES

Questions

1. Explain the construction of DC machine.
2. Derive the e.m.f. Equation of d.c. generator/motor.
3. Explain the field control method of dc shunt motor.
4. Draw and explain the characteristics of dc series motor.
5. Write a short note on three-point starter.
6. Draw and explain the characteristics of dc shunt motor.
7. Derive the torque equation of dc motor.
8. Explain the armature control method of dc shunt motor.
9. Compare dc shunt and dc series motor.