On a bearing using an oiling ring as a means of static oil feed, how often should the bottom of the bearing sump be drained of impurities?

Correct Answer: Option D — Bimonthly

Bimonthly draining of the bearing sump is the recommended maintenance interval for static oiling ring systems. This frequency ensures that accumulated moisture, grit, and metallic wear particles are removed before they can compromise the bearing's hydrodynamic film or cause accelerated abrasive wear on the journal and bearing surfaces.