D.C. shunt motors are used for driving machine tools.
Answer : In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.
Answer : In D.C. shunt motors as load is reduced the speed will remain almost constant.
Answer : Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.
Answer : The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.
Answer : During rheostat braking of D.C. series motors motor is run as a generator.