A 240V, 600 rpm DC Shunt Motor has a rated line current of 50A. If the armature resistance RA is 0.250 and the field resistance RF = 12009. (i) (ii) The cemf Eo at full load current and rated voltage is: (a) 227.5 V (b) 228 V (c) 252 V (d) 252.5 V The total copper loss for the motor is: (a) 480 W (b) 625 W (c) 1056 W (d) 1105 W (iii) The starting resistance that must be inserted in series with the armature in order to limit the motor full-voltage starting line current to 100 A is: (v) (a) 2.45 (b) 2.4 (c) 2.2 (d) 2.15 (iv) If the motor is operating at full load and rated voltage then dynamically braked using a 500 m2 external braking resistance, what is the initial value of the armature braking current? (a) 480 A (b) 456 A (c) 320 A (d) 304 A The initial braking power with the 500 m2 braking resistor is: (a) 115.2 kW (b) 103.97 kW (c) 76.8 kW (d) 69.31 kW