Methods of Excitation in DC Machines

____ is responsible for mechanical power output of a DC motor

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

The critical resistance refers to

Flashing is used to

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

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

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

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

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

The number of parallel paths in the armature is increased by