a) undercommutation b) overcommutation c) to rapid reversal of current d) any of these Ans: (d)
a) only when the armature is rotating in the field b) only when the field is rotation in the armature c) either (a) or (b) d) none of these Ans: (a)
a) compensating winding b) pole shoes c) interpoles d) all of these Ans: (c)
a) paper b) PVC c) Synthetic rubber d) Mica Ans: (d)
a) Retrogressive wave winding b) Progressive wave winding c) Lap winding d) All winding give similar results Ans: (c)
a) Both lap and wave wound armatures b) Lap wound armatures only c) Wave wound armatures only d) None of these Ans: (b)
a) To increase the efficiency of the machine b) To avoid short circuit current c) To neutralize the armature reaction d) To help get sparklers commutation Ans: (d)
a) One commutator segment and two mica insulations b) One commutator segment and one mica insulation c) Two commutator segments and two mica insulations d) Two commutator segments and one mica insulation Ans: (b)
a) In the direction of rotation for the generator and against the direction of rotation for the motor b) In the direction of rotation for both the generator and the motor c) Against in the direction of rotation for both the generator and the motor d) Against the direction of rotation for the generator and in the direction of rotation for the motor Ans: (a)
a) Zero degree b) Kept constant c) Varied with change in load d) None of the above Ans: (c)