D.C.MOTORs Questions

61. Which of the following motor has the poorest speed regulation ? (a) Shunt motor (b) Series motor (c) Differential […]

71. If I2 be the armature current, then speed of a D.C. shunt motor is (a) independent of Ia (b)

81. If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking (o)

11. In D.C. shunt motors as load is reduced (a) the speed will increase abruptly (b) the speed will increase

21. What will happen if the back e.m.f. of a D.C. motor vanishes suddenly? (a) The motor will stop (b)

31. In D.C. motor which of the following can sustain the maximum temperature rise? (a) Slip rings (b) Commutator (c)

41. Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads? (a) Series motor (b)

51. The condition for maximum power in case of D.C. motor is (a) back e.m.f. = 2 x supply voltage