Grey rods can be inserted in the core for most of the cycle to control the radial power distribution in the core, or they may reside out of the core and only inserted and withdrawn to make quick small changes to the power level. The Russians have used Dy in the form of Dysprosium titanate as a control rod material.
A rhetorical question is a device used to persuade or subtly influence the audience. It's a question asked not for the answer, but for the effect. Oftentimes, a rhetorical question is used to emphasize a point or just to get the audience thinking. Sometimes, a rhetorical question is asked with the asker already knowing the answer, such as the weather example.
Rhetoric is the art of communication with an audience. For writers, rhetoric means that the writer tries to communicate with the readers using literary devices and compositional techniques.There are many modes of rhetorical writing. The four most common modes are description, definition, narration, and argumentation.hetoric in writing refers to ways of communicating to readers-maybe through persuasion or visual impression. Though there are several modes of rhetoric, the four most common are description, definition, narrative, and argumentation.