This is where control rods come in. The control rods are lowered into the reactor to absorb some of the neutrons produced during fission reactions to keep the ratio under control. As the temperature rises, the rods are lowered, and as the temperature drops, the rods are raised to allow more fission reactions to occur. In an emergency where the reactor appears to be getting out of control, the rods are fully lowered into the reactor to shut it down altogether. Also known as absorption rods, nuclear reactor control rods are designed to operate even during a crisis situation in which a human being is not available.
Noun. 1. rhetorical device-a use of language that creates a literary effect (but often without regard for literal significance). rhetoric-study of the technique and rules for using language effectively (especially in public speaking). device-something in an artistic work designed to achieve a particular effect.itotes, meiosis-understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary); saying `I was not a little upset' when you mean `I was very upset' is an example of litotes.
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.