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  • Question
  • The main ore of thorium is


  • Options
  • A. pitchblende
  • B. monazite sand
  • C. limonite
  • D. galena

  • Correct Answer
  • monazite sand 


  • Nuclear Power Engineering problems


    Search Results


    • 1. Neutrons have mass approximately equal to that of __________ atoms.

    • Options
    • A. hydrogen
    • B. helium
    • C. deuterium
    • D. none of these
    • Discuss
    • 2. Heavy water is preferred over ordinary water as a coolant, because it.

    • Options
    • A. acts both as an efficient coolant as well as a moderator.
    • B. can be heated to a higher temperature without pressurizing.
    • C. is less prone to radiation damage.
    • D. all (a), (b) and (c).
    • Discuss
    • 3. "Critical mass" is the minimum mass of nuclear fissile material required for the

    • Options
    • A. sustainment of chain reaction.
    • B. power generation on commercial scale.
    • C. economic power generation.
    • D. none of these.
    • Discuss
    • 4. What is the average life of a radioactive atom having a 'half life period' of T?

    • Options
    • A. 1.44 T
    • B. 0.144 T
    • C. 14.4 T
    • D. 2T
    • Discuss
    • 5. The disintegration rate of a radioactive element

    • Options
    • A. progressively increases.
    • B. progressively decreases.
    • C. remains constant throughout.
    • D. may increase or decrease depending on the material.
    • Discuss
    • 6. Function of control rod in a nuclear reactor is to control

    • Options
    • A. temperature
    • B. pressure
    • C. fuel consumption
    • D. absorption of neutrons
    • Discuss
    • 7. The number of neutrons in the nucleus of Uranium-233 (92U233) is

    • Options
    • A. 141
    • B. 92
    • C. 233
    • D. 325
    • Discuss
    • 8. Commercial power generation from fusion reactor is not yet possible, because

    • Options
    • A. it is difficult to control nuclear fusion reaction.
    • B. the fuel required (i.e., deuterium & tritium) is scarce.
    • C. it is difficult to initiate fusion reaction.
    • D. quantity of fuel required for initiating fusion reaction is prohibitively high.
    • Discuss
    • 9. Molten sodium is used as a coolant in a fast breeder reactor, because of its

    • Options
    • A. excellent moderating properties.
    • B. neutron breeding capability.
    • C. faster heat removal capability from the core.
    • D. capability to increase the reaction rate in the core.
    • Discuss
    • 10. Extraction of uranium from its ore is done using __________ methods.

    • Options
    • A. electrometallurgical
    • B. pyrometallurgical
    • C. chemical
    • D. physical beneficiation
    • Discuss


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