1) A shunt generator has an output of 22 kW at a terminal
voltage of 220 V. Armature and shunt field resistances are 0.05 ohm
and 44 ohms, respectively. If the copper loss is equal to the core,
friction and windage losses at this load, determine the over-all
efficiency of the machine.
2) Three shunt generators running in parallel deliver a total
current of 2,000 A. Each machine has a field resistance of 40 ohms
and an armature resistance of 0.02 ohm. The emfs generated are 240,
242 and 245 V respectively. Determine the current delivered by each
generator.
3) Three shunt generators running in parallel deliver a total
current of 2,000 A. Each machine has a field resistance of 40 ohms
and an armature resistance of 0.02 ohm. The emfs generated are 240,
242 and 245 V respectively. Determine the current delivered by each
generator.