Nuclear Power Plants

21. Enriched uranium is one in which

  1. %age of U235 has been artificially in-creased
  2. %age of U has been artificially increased
  3. %age of U234 has been artificially in-creased
  4. extra energy is pumped from outside
  5. all impurities have been removed.

Correct answer: (A)
%age of U235 has been artificially in-creased

22. Enriched uranium may contain fissionable contents of the order of

  1. 1-99%
  2. 1-25%
  3. 1-50%
  4. 1-75%
  5. 1-90%.

Correct answer: (A)
1-99%

23. Fast breeder reactor uses

  1. boiler
  2. direct cycle of coolant system
  3. double circuit system of coolant cycle
  4. multi pass system
  5. single circuit system.

Correct answer: (C)
double circuit system of coolant cycle

24. Ferrite material is

  1. the most fissionable material
  2. the basic fuel for nuclear paints
  3. basic raw material for nuclear plants
  4. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
  5. none of the above.

Correct answer: (D)
the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

25. For economical operation of a nuclear plant

  1. used fuel should be reprocessed
  2. moderator should be used
  3. coolant should be employed
  4. control rods should be used
  5. reflector should be used.

Correct answer: (A)
used fuel should be reprocessed

26. Gas cooled reactor uses following materials as moderator, and coolant

  1. graphite, C02
  2. graphite, air
  3. heavy water, C02
  4. lead, H2
  5. concrete, N2.

Correct answer: (A)
graphite, C02

27. Half life of a radioactive isotope corresponds to the time required for half of the following to decay

  1. electrons
  2. protons
  3. neutrons
  4. nulceus
  5. atom.

Correct answer: (E)
atom.

28. Hydrogen is preferred as better coolant in comparison to C02 because former

  1. is lighter
  2. is inert
  3. has high specific heat
  4. is a good conductor
  5. all of the above.

Correct answer: (C)
has high specific heat

29. Ideally the neutron flux in reactor should be

  1. maximum in center and zero at side
  2. maximum at side and zero in center
  3. uniform throughout
  4. zero throughout
  5. none of the above.

Correct answer: (C)
uniform throughout

30. In a fission process, maximum %age of energy is released as

  1. kinetic energy of neutrons
  2. kinetic energy of fission products
  3. instantaneous release of gamma rays
  4. gradual readioactive decay of fission products
  5. none of the above.

Correct answer: (B)
kinetic energy of fission products

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