Chapter 30, Problem 1PA

You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M $\Omega$ to ground. Your ohmmeter, however, indicates a resistance of 1.5 $\Omega$ across terminals ${\text{S}}_{\text{1}}{\text{ and S}}_{\text{2}}$. The ohmmeter indicates a resistance of 225 $\Omega$ between terminals ${\text{F}}_{\text{1}}{\text{ and F}}_{\text{2}}$. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.