a) Increase in its flux b) Decrease in back emf c) Increase in armature current d) Decrease in brush drop Ans: (b)
a) Decrease by about 10 per cent b) Remain unchanged c) Increase by about 10 per cent d) Increase by 20 per cent Ans: (c)
a) It slow down b) It would draw extremely high armature current c) Its speed becomes dangerously high d) Torque developed by the motor would be reduced to zero Ans: (c)
a) Approach zero b) Approach infinity c) Not change d) Approach a stable value between zero and infinity Ans: (b)
a) Increasing the armature current b) Decreasing the armature current c) Increasing the excitation current d) Reducing the field current Ans: (d)
a) Increases b) Decreases c) Remains unchanged d) Fist increases and then decreases Ans: (a)
a) 100% b) About 90% c) 75% d) Less than 50% Ans: (d)
a) Fans b) Water pumps c) Traction d) flour mills Ans: (c)
a) Series motor b) Shunt motor c) Separately excited d) Cumulatively compound motor Ans: (a)
a) Series motor b) Shunt motor c) Cumulatively compound motor d) Separately excited motor Ans: (b)
a) Eddy current losses b) Stray losses c) Hysteresis losses d) Copper losses Ans: (b)
a) Remain unchanged b) Decrease by 4% c) Increase by 4% d) Increase by 16% Ans: (c)