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Question 1 A 400 V, 20 kW DC shunt motor draws a current of 2.5 A on no-load. The motor has an armature resistance of 0.5 Q and a field resistance of 800 2. Assume the flux to be constant. Calculate the following: a) Rotational loss (3 points) b) Efficiency of the motor at rated load (7 points)

Fig: 1