Answer
Kuzenguruka (ovality) bitera isoko yumuraba gushiraho umuvuduko utaringaniye mumaso ya kashe. Mubiharuro, umutwaro $ P $ uhinduka imikorere yumwanya wimpande $ \ theta $, ni ukuvuga $ P (\ theta) $. Ibi biganisha ku kwambara kudahuje karuboni ya kashe hanyuma amaherezo ikameneka. Akenshi ni inenge yo gukora cyangwa ibisubizo byo gufata nabi. Kuri pompe yihuta ya pompe, turagaragaza ovality ntarengwa (urugero, 0.1 mm) kandi tugakoresha isoko yikiziba cyiziritse, kubera ko gikomeza gukonjesha, kavukire gikomeza kuzenguruka neza kandi gitanga imizigo myinshi kuruta amasoko menshi yegeranye.