Power Plant Engineering MCQ

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• The nuclear radiators produced in a reactor which must be shielded are
  ক

  Electrons

  খ

  $$\alpha ,\,\beta $$  and $$\gamma $$ rays

  গ

  Neutron and gamma rays

  ঘ

  None of these
• In the breeder reactors the generation of new fissionable atom is
  ক

  At the lower rate than the consumption

  খ

  At a higher rate than the consumption

  গ

  At an equal rate of the consumption

  ঘ

  Depends on other considerations
• A reactor capable of converting a ferrite material into fissile isotopes is called
  ক

  Regenerative reactor

  খ

  Fast breeder reactor

  গ

  Breeder reactor

  ঘ

  Boiling water reactor
• Enriched uranium may contain fissionable contents of the order of
  ক

  1-99%

  খ

  1-25%

  গ

  1-50%

  ঘ

  1-75%
• Ferrite material is
  ক

  The most fissionable material

  খ

  The basic fuel for nuclear paints

  গ

  Basic raw material for nuclear plants

  ঘ

  The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
• The main interest of shielding in nuclear reactor is protection against
  ক

  X-rays

  খ

  Infrared rays

  গ

  Neutrons and gamma rays

  ঘ

  Electrons
• In natural uranium, the constituents of three naturally occurring isotopes are
  ক

  U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%

  খ

  U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

  গ

  U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%

  ঘ

  U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%
• The energy produced by a thermal reactor of same size as a breeder reactor is
  ক

  Almost same

  খ

  Slightly more

  গ

  Slightly less

  ঘ

  Much less
• The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is
  ক

  Same

  খ

  Lower

  গ

  Higher

  ঘ

  Unity
• Nuclear reactors are used
  ক

  To produce heat for thermoelectric power

  খ

  To produce fissionable material

  গ

  To propel ships, submarines, aircrafts

  ঘ

  All of these
• Ideally the neutron flux in reactor should be
  ক

  Maximum in centre and zero at side

  খ

  Maximum at side and zero in canter

  গ

  Uniform throughout

  ঘ

  Zero throughout
• Boiling water reactor employs
  ক

  Boiler

  খ

  Direct cycle of coolant system

  গ

  Double circuit system of coolant cycle

  ঘ

  Multi passes system
• The secondary fuel used in nuclear power plants is
  ক

  U₂₃₃ and Pu₂₃₉

  খ

  U₂₃₅ and Th₂₃₂

  গ

  U₂₃₅ and Pu₂₃₈

  ঘ

  U₂₃₃ and Pu₂₃₈
• The primary fuel used in nuclear power plants is
  ক

  U₂₃₅

  খ

  U₂₃₈

  গ

  Pu₂₃₉

  ঘ

  Pu₂₃₃
• A moderator generally used in nuclear power plants is
  ক

  Graphite

  খ

  Heavy water

  গ

  Concrete

  ঘ

  Graphite and concrete
• The presence of reflector in nuclear power plants results in
  ক

  Increased production of neutrons

  খ

  Complete absorption of neutrons

  গ

  Controlled production of neutrons

  ঘ

  Decreased leakage of neutrons
• Reflector in nuclear plants is used to
  ক

  Return the neutrons back into the core

  খ

  Shield the radioactivity completely

  গ

  Check pollution

  ঘ

  Conserve energy
• Moderator in nuclear plants is used to
  ক

  Reduce temperature

  খ

  Extract heat from nuclear reaction

  গ

  Control the reaction

  ঘ

  Cause collision with the fast moving neutrons to reduce their speed
• A pressurized water reactor employs pressurizes for the following application
  ক

  To maintain constant pressure in primary circuit under varying load

  খ

  To Supply high pressure steam

  গ

  To increase pressure of water in primary circuit

  ঘ

  To provide sub cooled water at high pressure
• Breeder reactors employ liquid metal coolant because it
  ক

  Acts as good moderator

  খ

  Produces maximum steam

  গ

  Transfers heat from core at a fast rate

  ঘ

  Breeds neutrons
• In triggering fission, the following types of neutrons are desirable
  ক

  Fast moving

  খ

  Slow moving

  গ

  Critical neutrons

  ঘ

  Neutrons at rest
• Plutonium is produced
  ক

  As basic raw material

  খ

  By neutron irradiation of Uz

  গ

  By neutron irradiation of thorium

  ঘ

  Artificially
• When a reactor becomes critical, then the production of neutrons is
  ক

  Infinite

  খ

  Zero

  গ

  Exactly balanced by the loss of neutrons through leakage

  ঘ

  Initiated
• Half life of a radioactive isotope corresponds to the time required for half of the following to decay
  ক

  Electrons

  খ

  Protons

  গ

  Neutrons

  ঘ

  Atom
• Breeder reactor has a conversion ratio of
  ক

  Unity

  খ

  More than unity

  গ

  Less than unity

  ঘ

  Zero
• The most commonly used moderator in nuclear plants is
  ক

  Heavy water

  খ

  Concrete and bricks

  গ

  Graphite and concrete

  ঘ

  Graphite
• Uranium has isotopes
  ক

  U₂₃₄

  খ

  U₂₃₅

  গ

  U₂₃₈

  ঘ

  All of these
• The following present serious difficulty in designing reactor shield
  ক

  Alpha particles

  খ

  Beta particles

  গ

  Thermal neutrons

  ঘ

  Fast neutrons and gamma rays
• A nuclear unit becoming critical means
  ক

  It is generating power to rated capacity

  খ

  It is capable of generating much more than rated capacity

  গ

  There is danger of nuclear spread

  ঘ

  Chain reaction that causes automatic splitting of the fuel nuclei has been established
• Artificial radioactive isotopes find application in
  ক

  Power generation

  খ

  Nucleonic devices

  গ

  Nuclear fission

  ঘ

  Medical field