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A 10-hp, 120-V, 1000-rpm shunt dc motor with compensating windings has R of 0.3 12 and adjustable RF of 37.5 12 to 75 12. The shunt-field winding has 500 turns. The motor consumes 6 kW of power. The magnetization curve data at 1000 rpm is shown. EA (V) | 100, 150 200 150 200 250 290 325 IF (A) 3.5 4.0 4.5 5.0 5.5 6.0 a) Find the minimum and maximum motor speed under the given conditions. b) At 4800 W of input power, design an automatic starter circuit for this shunt dc motor with RF set at 48 12. The maximum starting current is limited to 250% of the consumed armature current and the starting resistor stage is to be cut out when the armature current falls to its consumed value. Find the number of stages of the starting resistance and their associated values. Calculate the values of EA when each starting resistor is cut out. What is the value of Ia immediately after all starting resistors are cut out? c) Now the motor is reconnected as a separately excited dc motor with VA connected to a variable de source of 90 V to 150 V, and Ve = 120 V. However, its compensating windings fails resulting in armature reaction demagnetization mmf of 100 At. Determine the minimum and maximum motor speed at 4500 W of input power. Explain the conditions of Va, If and RF when these speeds occur. A 10-hp, 120-V, 1000-rpm shunt dc motor with compensating windings has R of 0.3 12 and adjustable RF of 37.5 12 to 75 12. The shunt-field winding has 500 turns. The motor consumes 6 kW of power. The magnetization curve data at 1000 rpm is shown. EA (V) | 100, 150 200 150 200 250 290 325 IF (A) 3.5 4.0 4.5 5.0 5.5 6.0 a) Find the minimum and maximum motor speed under the given conditions. b) At 4800 W of input power, design an automatic starter circuit for this shunt dc motor with RF set at 48 12. The maximum starting current is limited to 250% of the consumed armature current and the starting resistor stage is to be cut out when the armature current falls to its consumed value. Find the number of stages of the starting resistance and their associated values. Calculate the values of EA when each starting resistor is cut out. What is the value of Ia immediately after all starting resistors are cut out? c) Now the motor is reconnected as a separately excited dc motor with VA connected to a variable de source of 90 V to 150 V, and Ve = 120 V. However, its compensating windings fails resulting in armature reaction demagnetization mmf of 100 At. Determine the minimum and maximum motor speed at 4500 W of input power. Explain the conditions of Va, If and RF when these speeds occur