5. Which best describes the need for the use of the imaginary distance \"d\" (a)

Question

5. Which best describes the need for the use of the imaginary distance "d" (a) It solves several analytical and numerical integration errors (b) With neutron diffusion, Fick's Law breaks down near the material and air/vacuum boundary, and the use of "d" allows a more accurate description of the flux profile within the material (c) A "boundary" is physically fuzzy and is hard to quantify (d) It allows interpolation to be performed When calculating power of a bare spherical reactor, why is the integral only evaluat up to "R" and not ""? (where R R+ d) 6. (a) It must have been a typographical error in the book (b) Because R is the extrapolated boundary (c) Because R is the physical boundary. The neutrons "stream" for r>R No power is generated for r>R. (d) None of the above 7. If there were no delayed neutrons, nuclear power generation (a) Would be much simpler (b) Would produce much more power rather than delaying the power g (c) Would not be possible because it could not be controlled (d) Would not be possible because delayed neutrons produce all the pe 8. In our simple BOP model, specifically comparing inlet with outlet values, gen classify the following components as isothermal (Tin Tout), isenthalpic (hin isentropic (Sin Soul, isobaric (Pn-Pou), or none-apply (a) Pipe with heat input and fluid friction (b) Valve (c) Turbine (d) Condenser (e) Pump

Explanation / Answer

5) answer 'b'--- a scalar flux distance 'd' in the diffusion used for approximation to get more accurate.

6) answer 'c'

7) answer 'c'-Without delayed neutrons, changes in reaction rates in nuclear reactors would occur at speeds that are too fast for humans to control.

8) (a) without friction it will be isrothermal.Due to the friction the tmeperature at outlet will decrease

   (b) valve used in refrigerators are isenthalpic .

   (c) turbine-without considering any losses it is a reversible adiabatic (isentropic) process

   (d) condenser-it is a constant pressure process(isobaric)

   (e) pump-without any losses it is a isentropic process.

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