In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be

A. Greater than 1.0

B. Less than 1.0

C. Equal to zero

D. Equal to 1.0

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  16. The presence of reflector in nuclear power plants results in
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  18. Boiling water reactor uses the following as moderator, coolant and working fluid
  19. Electron volt is the unit of
  20. The secondary fuel used in nuclear power plants is
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  23. In nuclear fission
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  25. A nuclear unit becoming critical means
  26. The process by which a heavy nucleus is spitted into two light nuclei is known as
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