Q.34 A 250 DC shunt motor having armature resistance of 0.2 Ω and field resistance of 100 Ω.It draws a no load current of 5 A at 1200 rpm. The brush drop is 1 V per brush at all operating conditions. If motor draws 50 A at fulled load and flux per pole is decreased
by 5% because of armature reaction. The speed of the motor at full load is ____ rpm.
(A) 900
(B) 1000
(C) 1200
(D) 1220
Answer: (D)
Explanation:
