Operating Characteristics of DC Generators

A student forgot to mark the x-y axes in his experiments but he just noted down the cause and the effect for each. How will he conclude about the armature
characteristic out of the all plotted graphs?

Choose the most inappropriate out of the following for the no-load characteristics of the dc generator.

Which of the following characteristics reveal about the magnetization nature of the machine?

Armature characteristic is also known as

The voltage drop in terminal voltage from no-load to full load in a shunt generator can be compenated using

Mark the correct order for the external characteristics of compound generators from the below graph.

Why is armature of a dc machine made of silicon steel stampings?

The air gap line represents

The external characteristic is plotted between

For a 220-V level compound generator the terminal voltage at the half load is

What losses occur in the teeth of dc generator?

For a given dc generator, the external characteristic is plotted . Without using further plots, how can we obtain internal characteristic?

Identify the machines by observing their external characteristics for (i) and (ii) respectively.