DC Shunt Motor

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Joined Dec 18, 2012
A shunt motor rotated a constant mechanical load at 895 rpm. The motor has the following parameters: RA=0.24Ω RF=165Ω PMECH=265W.When a voltage of 180v is applied to the motor the armature current IA=12.4A. Calculate the speed and efficiency of the motor if 240v was applied.

Cant seem to get going on this one, anyone help?