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cycle to control the radial power distribution in the core, or they may reside out of the core and only inserted and withdrawn to make quick small changes to the power level.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 (pronounced /ËrÉtÉrÉªk/) is the art of discourse, an art that aims to improve the capability of writers or speakers to inform, persuade, or motivate particular audiences in specific situations. Kenneth Burke was a rhetorical theorist, philosopher, and poet. 2  Many of his works are central to modern rhetorical theory: A Rhetoric of Motives (1950), A Grammar of Motives (1945), Language as Symbolic Action (1966), and Counterstatement (1931).