If a D.C. generator fails to build up the probable cause could not be
A)imperfect brush contact
B)field resistance less than the critical resistance
C)no residual magnetism in the generator
D)faulty shunt connections tending to reduce the residual magnetism

Question

Quizplus · Accepted Answer

The critical resistance is the maximum field resistance at which a generator can excite. If the field resistance is less than the critical resistance, it means the generator has the potential to build up voltage, assuming other conditions are favorable. This is because lower resistance in the field circuit allows more current to flow, which can aid in the buildup of voltage if residual magnetism is present.

If a DC Generator Fails to Build Up the Probable Cause Could