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MCQs

Total Questions : 807 | Page 10 of 81 pages
Question 91. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
  1.    Heavy water
  2.    Graphite
  3.    Carbon dioxide
  4.    No moderator is needed
 Discuss Question
Answer: Option D. -> No moderator is needed
Question 92. A fission chain reaction in uranium can be developed by
  1.    Slowing down fast neutrons so that Uz fission continues by slow motion neutrons
  2.    Accelerating fast neutrons
  3.    Absorbing all neutrons
  4.    Using moderator
 Discuss Question
Answer: Option A. -> Slowing down fast neutrons so that Uz fission continues by slow motion neutrons
Question 93. The energy required to be applied to a radioactive nucleus for the emission of a neutron is
  1.    1 MeV
  2.    2.4 MeV
  3.    4.3 MeV
  4.    7.8 MeV
 Discuss Question
Answer: Option D. -> 7.8 MeV
Question 94. In nuclear fission
  1.    The original elements change into completely different elements
  2.    The electrons of the element change
  3.    The molecules rearrange themselves to form other molecules
  4.    None of the above
 Discuss Question
Answer: Option A. -> The original elements change into completely different elements
Question 95. The total energy released in fission of U is
  1.    5 MeV
  2.    10 MeV
  3.    199 MeV
  4.    168 MeV
 Discuss Question
Answer: Option C. -> 199 MeV
Question 96. Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal
  1.    Centrifugal
  2.    Axial
  3.    Reciprocation
  4.    Electromagnetic
 Discuss Question
Answer: Option D. -> Electromagnetic
Question 97. Artificial radioactive isotopes find application in
  1.    Power generation
  2.    Nucleonic devices
  3.    Nuclear fission
  4.    Medical field
 Discuss Question
Answer: Option D. -> Medical field
Question 98. U235 will undergo fission by
  1.    High energy (fast) neutrons alone
  2.    Low energy (slow) neutrons alone
  3.    Either fast or slow neutrons
  4.    Medium energy neutrons
 Discuss Question
Answer: Option C. -> Either fast or slow neutrons
Question 99. U238 will undergo fission by
  1.    High energy (fast) neutrons alone
  2.    Low energy (slow) neutrons alone
  3.    Either fast or slow neutrons
  4.    Medium energy neutrons
 Discuss Question
Answer: Option A. -> High energy (fast) neutrons alone
Question 100. A nuclear unit becoming critical means
  1.    It is generating power to rated capacity
  2.    It is capable of generating much more than rated capacity
  3.    There is danger of nuclear spread
  4.    Chain reaction that causes automatic splitting of the fuel nuclei has been established
 Discuss Question
Answer: Option D. -> Chain reaction that causes automatic splitting of the fuel nuclei has been established

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