1. An 8-pole lap connected armature has 96 slots with 6 conductors per slot and is driven at 500 r.p.m. The useful flux per pole is 0.09Wb. Calculate the generated e.m.f. [432V] 2. A four-pole armature has 624 lap-connected conductors and is driven at 1200 r.p.m. Calculate the useful flux per pole required to generate an e.m.f of 250V. [0.02Wb/pole] 3. A six-pole armature has 410 wave-connected conductors. The useful flux per pole is 0.025Wb. Find the speed at which the armature must be driven if the generated e.m.f. is to be 485V. [9461.p.m] 4. The wave-connected armature of a four-pole d.c. generator is required to generate an e.m.f. of 520V when driven at 660 r.p.m. Calculate the flux per pole required if the armature has 144 slots with 2 coil slides per slot, each coil consisting of 3 turns. [0.0274Wb/pole] 5. The armature of a four-pole d.c. generator has 47 slots, each containing 6 conductors. The armature winding is wave-connected, and the flux per pole is 25mWb. At what speed must the machine be driven to generate an e.m.f of 250V? [1064 rp.m] 6. Calculate the e.m.f. developed in the armature of a two-pole d.c. generator, whose armature has 280 conductors and is revolving at 1000r.p.m. The flux per pole is 0.03Wb. [140V] 7. The e.m.f. generated by a four-pole d.c. generator is 400V when the armature is driven at 1000 r.p.m. Calculate the flux per pole if the wave-wound armature has 39 slots with 16 conductors per slot. [0.019Wb/pole] 8. A six-pole d.c. generator has a lap-connected armature with 480 conductors. The resistance of the armature circuit is 0.020. With an output current of 500A from the armature, the terminal voltage is 230V when the machine is driven at 900 r.p.m. Calculate the useful flux per pole. [0.033Wb/pole] 9. A four-pole d.c. generator gives 410V on open circuit when driven at 900 r.p.m. Calculate the flux per pole if the wave connected armature winding has 39 slots with 16 conductors per slot. [0.0219 Wb/pole]