6.Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?

7.The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is

8.The condition for maximum power in case of D.C. motor is

9.In D.C. machines fractional pitch winding is used

10.For the same H.P. rating and full load speed, following motor has poor starting torque