OK, so maybe you didn't do all that well on Quiz 1. I never said that some of the statements might not be a bit sneaky. Each must be read carefully ... some are not as easy as they appear. Or, maybe you want to prove your good results on Quiz 1 were not accidental ... you really are as smart as you think you are. For whatever reason, even none at all, let's try again ... best two out of three.

last update April 12, 1998

  1. The fraction of fast fission neutrons that slow down to thermal energy and cause fission is equal to keff/ p (where p = the resonance escape probability).
    True False

  2. Reactivity represents the fractional change in the neutron population in one second.
    True False

  3. At full power, the strongest neutron source in the core is the non-fission neutron source.
    True False

  4. The fraction of fission neutron production that is prompt neutrons is (1 - beta), where beta equals the precursor yield fraction.
    True False

  5. The number of U-235 atoms fissioned per second to produce one watt of power is 31billion.
    True False

  6. A precursor atom is a fission fragment that undergoes radioactive decay to produce a prompt fission neutron.
    True False

  7. Doubling time is always longer than the corresponding value of the reactor period.
    True False

  8. If reactor power is increasing with time, the reactor is supercritical.
    True False

  9. The number of prompt neutron life cycles occuring during each second of a typical chain reaction is 10,000.
    True False

  10. A prompt neutron slows down in a shorter time interval than a delayed neutron because of its greater speed at birth.
    True False

The US Nuclear Regulatory Commission (USNRC) requires 80% correct for passing a License exam. All statements are false except for numbers 4, 5, and 9. An expert analysis of this quiz is given under EXPLANATION #2. Revisit us for the thrill of the next exciting quiz. Return to homepage.

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