Common Data Questions: 48 & 49

A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied
to the armature. The field voltage is maintained at its rated value. The speed of
the motor, when it delivers a torque of 5 Nm, is 1400 rpm as shown in the figure.
The rotational losses and armature reaction are neglected.

Q. The armature resistance of the motor is,
Option (A)
2 ohm
Option (B)
3.4 ohm
4.4 ohm
7.7 ohm
Correct Option: