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Nuclear power

Chemistry • Nuclear Energy & Applications • Knowledge-Based • 5 questions

Nuclear power Knowledge-Based Download PDF

Chemistry · Nuclear Chemistry · Chemistry · Nuclear Energy & Applications

5 Chemistry practice questions on Nuclear power. Questions that assess core concepts and understanding.

Questions

  1. 1.

    In a pressurized water nuclear reactor, why is the primary coolant loop kept physically separated from the secondary steam-generating loop by a heat exchanger?

    • A) To prevent radioactive materials present in the reactor core coolant from entering the turbine system
    • B) To lower the operating temperature of the reactor core so that the control rods do not melt
    • C) To moderate the speed of fission neutrons through physical separation of the two water systems
    • D) To allow atmospheric oxygen into the core to sustain the nuclear chain reaction
  2. 2.

    Why must naturally occurring uranium be isotopically enriched before it can be used as fuel in most commercial nuclear reactors?

    • A) To convert fertile uranium-238 into fissile plutonium-239 prior to fuel fabrication
    • B) To eliminate impurities that would otherwise capture alpha particles during decay
    • C) To increase the proportion of fissile uranium-235 to a concentration that sustains a chain reaction
    • D) To slow down fast neutrons so that their kinetic energy matches the thermal energy of the core
  3. 3.

    Which sequence correctly represents the overall conversion of energy forms occurring in a commercial nuclear power plant to generate electricity?

    • A) Thermal energy → Nuclear energy → Electrical energy → Mechanical energy
    • B) Nuclear energy → Electrical energy → Thermal energy → Mechanical energy
    • C) Nuclear energy → Thermal energy → Mechanical energy → Electrical energy
    • D) Nuclear energy → Mechanical energy → Thermal energy → Electrical energy
  4. 4.

    In a commercial nuclear fission reactor, what is the primary role of the control rods?

    • A) To slow down fast neutrons to thermal velocities to sustain the chain reaction
    • B) To transfer thermal energy from the fuel assemblies directly to the electrical generator
    • C) To supply an initial source of fissile isotopes that initiate nuclear fusion
    • D) To absorb excess neutrons in order to regulate or shut down the fission chain reaction
  5. 5.

    In a commercial nuclear fission reactor, what is the primary function of the moderator?

    • A) Absorbing excess neutrons to prevent an uncontrolled supercritical chain reaction
    • B) Slowing down fast neutrons to thermal speeds to sustain efficient nuclear fission
    • C) Transferring thermal energy away from the reactor core to drive a steam turbine
    • D) Providing heavy structural shielding to prevent the escape of ionizing radiation