Q2. A 15-hp, 230V, 1800 r/min shunt dc motor has a full-load armature current of 60A when operating at rated conditions. The armature resistance of the motor is R=0.152, and the field resistance R=80.The adjustable resistance in the field circuit R902. No armature reaction. The magnetization curve at a speed of 1800 r/min is given below: adj FA (V)8.5150180215 226 242 (A) 0 0.8 1 1.281.442.88 (a) What is the speed of this motor when it is running at rated conditions? (b) The output power from the motor is 7.5 hp at rated conditions. What is the output torque of the motor? (c) What are the copper losses and rotational losses in the motor at full load (ignore stray losses)? (d) What is the efficiency of the motor at full load? (e) If the motor is now unloaded, what is the no-load speed of the motor? (f) At the no-load conditions, what would happen to the motor if its field circuit were to open? What would the final steady-state speed of the motor be under those conditions? (g) What range of no-load speeds is possible in this motor, if Radj varied from (0-2002)?