Question

27. When speed of a dc motor increases, the armature current
(1) Increases
(2) Decreases
(3) Does not change
in by 220 V dc supply. The
(4) Increases and decreases continuously

28. The armature of dc motor has 20 2 resistance. It draws current of 1.5 A when run by 220 V dc Sup
value of back emf induced in it will be
(1) 150 V
(3) 180 V
(2) 170 V
(4) 190 v

Answer 1

Answer:

27: increases ,as speed of dc motor is inversely proportional to armature current.