The figures above show the schematic of an unloaded DC generator (left) and its excitation curve (right). The generator has negligible armature resistance and a shunt field coil resistance of 60 . The variable Field Control Rheostat has resistance of 0 - 80 Q. Answer the following questions related to the unloaded dc generator. (i) What is the field current at no-load if the field control rheostat is set to its minimum position? (ii) What is the induced emf at no-load when the field control rheostat resistance is set to its maximum? (iii) What value of field control rheostat is required to produce a no-load terminal voltage of 120 V? Rf RFCR If Eo Ia Eo (V) 160 140 120 100 Et 80 60 40 20 0 0 0.5 1 1.5 If (A) 2 2.5 3