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  • Question
  • The function of moderators in nuclear reactor is to


  • Options
  • A. slow down the secondary neutrons.
  • B. absorb the secondary neutrons.
  • C. control the chain reaction.
  • D. none of these.

  • Correct Answer
  • slow down the secondary neutrons. 


  • Nuclear Power Engineering problems


    Search Results


    • 1. A moderator __________ the neutrons.

    • Options
    • A. slows down
    • B. absorbs
    • C. accelerates
    • D. reflects
    • Discuss
    • 2. Which of the following is not an ore of uranium?

    • Options
    • A. Pitchblende
    • B. Kyanite
    • C. Carnotite
    • D. Rescolite
    • Discuss
    • 3. Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.

    • Options
    • A. equal to
    • B. less than
    • C. more than
    • D. either more or less
    • Discuss
    • 4. The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the

    • Options
    • A. fuel cost per unit power generated is less.
    • B. thermal efficiency of the former is higher.
    • C. maintenance cost of the former is less.
    • D. none of these.
    • Discuss
    • 5. A radioactive isotope undergoes decay with respect to time following __________ law.

    • Options
    • A. logarithmic
    • B. exponential
    • C. linear
    • D. inverse square
    • Discuss
    • 6. The 92U238 emits an a-particle. The product is

    • Options
    • A. 90U234
    • B. 90U238
    • C. 90U236
    • D. 92U236
    • Discuss
    • 7. The ratio of atomic radius to its nuclear radius is about

    • Options
    • A. 105
    • B. 108
    • C. 1012
    • D. 1015
    • Discuss
    • 8. The time required for half of the __________ of a radioactive isotope to decay is called its half life.

    • Options
    • A. nuclei
    • B. electrons
    • C. protons
    • D. neutrons
    • Discuss
    • 9. The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235 , followed by nuclear fission is

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 10. Emission of ?-particles during radioactive decay of a substance is from

    • Options
    • A. innermost shell
    • B. nucleus
    • C. outermost shell
    • D. none of these
    • Discuss


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