Methods of Excitation in DC Machines

Consider a DC generator running at the rated speed of 2000 rpm, suddenly there is an insulator falls on the field circuit and breaks it. Then

A series generator, having external characteristics which is a straight line through 0 to 50 V at 200 A is connected as a booster, between a station bus-bar and feeders of 0.5 ohm resistors. The voltage at the far end of feeder at current of 50 A is

____ is responsible for mechanical power output of a DC motor

Flashing is used to

The self-excited dc generator with gradual build up of residual voltage and EMF corresponds to

The critical resistance refers to

A dc series generator as armature and field connections are reversed, the generator

If a DC shunt generator fails to start, the most primitive action would be

If a self excited DC generator is failed to run, this refers to

The number of parallel paths in the armature is increased by