Nuclear Power Plants

41. Natural uranium is made up of

  1. 99.282% U238, 0.712% U235, 0.006% U234
  2. 99.282% U235, 0.712% U238, 0.06%' U234
  3. 99.282% U234, 0.712% U238, 0.006% U235
  4. 99.282% U235, 0.712% U234, 0.006% U238
  5. none of the above.

Correct answer: (A)
99.282% U238, 0.712% U235, 0.006% U234

42. One gram of uranium will produce energy equivalent to approximately

  1. 1 tonne of high grade coal
  2. 4.5 tonnes of high grade coal
  3. 10 tonnes of high grade coal
  4. 100 tonnes of high grade coal
  5. 1000 tonnes of high grade coal.

Correct answer: (B)
4.5 tonnes of high grade coal

43. Pick up the wrong statement

  1. In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.
  2. Slow or thermal neutrons have energy of the order or 0.025 eV
  3. Fast neutrons have energies above 1000 eV
  4. Fast reactor uses moderator
  5. Most serious drawback in using water as coolant in nuclear plants is its high vapour pressure.

Correct answer: (D)
Fast reactor uses moderator

44. Pick up the wrong statement Fast breeder reactors

  1. operate at extremely high power densities.
  2. are liquid-metal cooled
  3. produce more fuel than they consume
  4. are unmoderated
  5. use water as coolant.

Correct answer: (E)
use water as coolant.

45. Plutonium is produced

  1. as basic raw material
  2. by neutron irradiation of Uz
  3. by neutron irradiation of throium
  4. artificially
  5. in high capacity furnace.

Correct answer: (B)
by neutron irradiation of Uz

46. Plutonium-239 is produced

  1. as basic raw material
  2. by neutron irradiation of IT*
  3. by neutron irradiation of thorium
  4. artificially
  5. in high capacity furnaces.

Correct answer: (B)
by neutron irradiation of IT*

47. Pressurised water reactor isdesigned

  1. for boiling pi water in the core
  2. to use liquid sodium metal as coolant
  3. to use intermediate coolant
  4. to prevent the water coolant from boiling in the core
  5. to eliminate the coolant loop of the pressurised water.

Correct answer: (D)
to prevent the water coolant from boiling in the core

48. Reactors designed for propulsion applications are designed for

  1. natural uranium
  2. enriched uranium
  3. pure uranium
  4. any type of uranium
  5. none of the above.

Correct answer: (B)
enriched uranium

49. Reactors for propulsion applications use

  1. natural uranium
  2. molten lead
  3. any form of uranium
  4. thorium
  5. plutonium.

Correct answer: (B)
molten lead

50. Reflector in nuclear plants is used to

  1. return the neutrons back into the core
  2. shield the radioactivity completely
  3. check polllution
  4. conserve energy
  5. is not used.

Correct answer: (A)
return the neutrons back into the core

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