![A DC Motor is driving a constant load torque having armature resistance of 0.15 Ω and armature current of 0.25 A having connected to a voltage of 230 V.](https://www.gkseries.com/blog/wp-content/uploads/2022/02/A-DC-Motor-is-driving-a-constant-load-torque-having-armature-resistance-of-0.15-Ω-and-armature-current-of-0.25-A-having-connected-to-a-voltage-of-230-V.-.png)
Q. A DC Motor is driving a constant load torque having armature resistance of 0.15 Ω and armature current of 0.25 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be
A. 0.25
B. 1.24
C. 0.62
D. 0.72
Answer: 0.72