Nuclear Power Plants

81. When a reactor becomes critical, then the production of neutrons is

  1. infinite
  2. zero
  3. exactly balanced by the loss of neutrons through leakage
  4. initiated
  5. stopped.

Correct answer: (C)
exactly balanced by the loss of neutrons through leakage

82. Which is not identical for an atom and an isotope

  1. mass number
  2. atomic number
  3. chemical properties
  4. position in periodic table
  5. all of the above.

Correct answer: (A)
mass number

83. Which of the following are ferrite materials

  1. U233andPu239
  2. U
  3. U238andPu239
  4. U238andTh239
  5. none of the above

Correct answer: (B)
U

84. Which of the following can be used as a coolant in nuclear plant

  1. light or heavy water
  2. molten lead
  3. carbon dioxide
  4. freon
  5. carbon tetrachloride.

Correct answer: (A)
light or heavy water

85. Which of the following is more appropriate for a moderator. One which

  1. does not absorb neutrons
  2. absorbs neutrons
  3. accelerates neutrons
  4. eats up neutrons
  5. regenerates neutrons.

Correct answer: (A)
does not absorb neutrons

86. Which of the following is secondary fuel

  1. Th232andU238
  2. U233andPu239
  3. U233andPu238
  4. All above
  5. None

Correct answer: (C)
U233andPu238

87. Which of the following is the heaviest

  1. neutron
  2. proton
  3. atom
  4. electron
  5. nucleus.

Correct answer: (C)
atom

88. Which of the following is the primary fuel

  1. Ulii
  2. U
  3. U238
  4. Pu:
  5. Pu

Correct answer: (B)
U

89. Which of the following nuclear reactor does not need a heat exchanger for generation of steam

  1. gas cooled
  2. liquid metal cooled
  3. pressurised water
  4. boiling water
  5. none of the above.

Correct answer: (D)
boiling water

90. Which of the following particles is the lightest

  1. nucleus
  2. electron
  3. proton
  4. meson
  5. neutron.

Correct answer: (B)
electron

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