Why does the compound motor have a defenite no-load speed

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1. By what test on dc reparalely excited generator would you determine the armature reaction equivalent field current at rated armature current.

2. Assuming magnetic linearity derive the expression for speed-torque characteristic of a dc series motor using suitable symbols.

3. Compare the speed troque characteristices of a series and cummulative compound motor. Why does the compound motor have a defenite no-load speed?

4. Sketch the external characteristic of a shunt generator and explain the reason for its special nature: part of it is two-valued.

Reference no: EM131265679

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