a) 0Ω b) Infinite c) About 10Ω d) About 100Ω Ans: (a)
a) Prevent sparking during commutation b) Provide a path for flow of current c) Brush off carbon deposits on the commutator d) None 0f these Ans: (b)
a) 0.1Ω b) 1Ω c) 10Ω d) 100Ω Ans: (d)
a) Increasing the speed of motor b) Reducing sparking at the commutation c) Decreasing the counter emf d) Converting armature current to dc Ans: (b)
a) Cumulative compound b) Differential compound c) Level compound d) None of these Ans: (a)
a) 2 poles b) 4 poles c) 6 poles d) 8 poles Ans: (a)
a) To get a stronger magnetic field b) To improve the air circulation c) To reach a higher speed of rotation d) To make the rotation easier Ans: (a)
a) 0.01Ω b) 0.1Ω c) 1Ω d) 10Ω Ans: (d)
a) Brushes b) Commutator c) End plates d) Both (a) and (b) Ans: (d)
a) Yoke b) Size of conductor c) Commutator d) Winding Ans: (c)