10. Q. What care or attention should be given the commutator?

A. The commutator must be kept clean, free from dirt, and the mica must

be kept filed a trifle below the surface of the copper bars.

The Traveling Engineers' Association to Improve the Locomotive Engine Service of American Railroads Examination Questions and Answers for Firemen for Promotion and New Men for Employment · 第 229 / 436 题