Nuclear Power Plants

31. In boiling water reactor, moderator is

  1. coolant itself
  2. ferrite rod
  3. graphite rod
  4. liquid sodium metal
  5. blanket of thorium.

Correct answer: (A)
coolant itself

32. In fast breeder reactors

  1. any type of moderator can be used
  2. graphite is used as the moderator
  3. heavy water is used as the moderator
  4. moderator may or may not be used
  5. moderator is dispensed with.

Correct answer: (E)
moderator is dispensed with.

33. 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.
  5. None

Correct answer: (A)
the original elements change into completely different elements

34. In nuclear fission each neutron that causes fission releases

  1. no new neutron
  2. at least one new neutron
  3. one new neutron
  4. more than one new neutrons
  5. many-fold neutrons.

Correct answer: (D)
more than one new neutrons

35. In order to have constant clain 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

  1. greater than 1.0
  2. less than 1.0
  3. equal to zero
  4. equal to 1.0
  5. equal to infinity.

Correct answer: (D)
equal to 1.0

36. In the breeder reactors the generation of new fissionable atom is

  1. at the lower rate than the consumption
  2. at a higher rate than the constuption
  3. at an equal rate of the consumption
  4. depends on other considerations
  5. unpredictable.

Correct answer: (B)
at a higher rate than the constuption

37. In triggering fission, the following types of neutrons are desirable

  1. fast moving
  2. slow moving
  3. critical neutrons
  4. neutrons at rest
  5. none of the above.

Correct answer: (B)
slow moving

38. In triggering fission, which type of neutrons are more effective

  1. fast
  2. slow
  3. in bulk
  4. static
  5. activated.

Correct answer: (B)
slow

39. Isotopes of same elements have

  1. same atomic number and different masses
  2. same chemical properties but different atomic numbers
  3. different masses and different atomic numbers
  4. different chemical properties and same atomic numbers
  5. same chemical properties and same atomic numbers.

Correct answer: (B)
same chemical properties but different atomic numbers

40. Moderator in nuclear plants is used to

  1. reduce temperature
  2. extract heat from nuclear reaction
  3. control the reaction
  4. cause collision with the fast moving neutrons to reduce their speed
  5. moderate the radioactive pollution.

Correct answer: (D)
cause collision with the fast moving neutrons to reduce their speed

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