There is a question on generators that I would like to ask.
I know that in shunt generators there is a particular upper limit to generator field resistance which should not be exceeded. This resistance is called CRITICAL RESISTANCE. If this resistance is exceeded then there won't be any build up of voltage in the generator.
I would like to know whether there is some particular lower limit to the field resistance also when the generator is operating on load. What will happen when the resistance is lowered below this limit.