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Current Affairs January 2024

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4

Breeder reactors employ liquid metal coolant because it

A. Acts as good moderator

B. Produces maximum steam

C. Transfers heat from core at a fast rate

D. Breeds neutrons

Correct Answer :

C. Transfers heat from core at a fast rate


Related Questions

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U233 is produced

A. As basic raw material

B. By neutron irradiation of Uz

C. By neutron irradiation of thorium

D. Artificially

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The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is

A. Higher cost of nuclear fuel

B. High initial cost

C. High heat rejection in condenser

D. Lower temperature and pressure conditions

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Reactors for propulsion applications are designed for

A. Any form of uranium

B. Natural uranium

C. Enriched uranium

D. Plutonium

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A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

A. Stable under nuclear radiation

B. Corrosion resistant

C. Good thermal conductor

D. All of these

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Enriched uranium is one in which

A. Percentage of U₂₃₅ has been artificially increased

B. Percentage of U has been artificially increased

C. Percentage of U₂₃₄ has been artificially increased

D. Extra energy is pumped from outside

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Enriched uranium may contain fissionable contents of the order of

A. 1-99 %

B. 1-25 %

C. 1-50 %

D. 1-75 %

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Nuclear reactors are used

A. To produce heat for thermoelectric power

B. To produce fissionable material

C. To propel ships, submarines, aircrafts

D. All of these

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A fast breeder reactor

A. Uses graphite rods as moderator

B. Has powerful moderator

C. Has no moderator

D. Uses ferrite material as moderator

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The commonly used material for shielding is

A. Lead or concrete

B. Lead and tin

C. Graphite or cadmium

D. Thick galvanised sheets

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Reactors for propulsion applications use

A. Natural uranium

B. Molten lead

C. Any form of uranium

D. Thorium

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Each fission of U₂₃₅ produces on the average _________ fast neutrons as a product of reaction.

A. 2.46

B. 24.6

C. 246

D. 2460

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A reactor capable of converting a ferrite material into fissile isotopes is called

A. Regenerative reactor

B. Fast breeder reactor

C. Breeder reactor

D. Boiling water reactor

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The risk of radioactive hazard is greatest in the turbine with following reactor

A. Pressurised water

B. Boiling water

C. Gas cooled

D. Liquid metal cooled

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Boiling water reactor uses the following as moderator, coolant and working fluid

A. Ordinary fluid

B. Heavy water

C. Molten lead

D. Hydrogen gas

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Atomic number of an element in the periodic table represents the numbers of

A. Protons in the nucleus

B. Electrons in the nucleus

C. Neutrons in the nucleus

D. Electrons in the atom

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Ferrite material is

A. The most fissionable material

B. The basic fuel for nuclear paints

C. Basic raw material for nuclear plants

D. The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

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

A. Infinite

B. Zero

C. Exactly balanced by the loss of neutrons through leakage

D. Initiated

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Reactors designed for propulsion applications are designed for

A. Natural uranium

B. Enriched uranium

C. Pure uranium

D. Any type of uranium

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Amongst the following, the fissionable materials are

A. U₂₃₃ and Pu₂₂₉

B. U₂₃₁ and Pu₂₃₃

C. U₂₃₅ and Pu₂₃₅

D. U₂₃₈ and Pu₂₃₉

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4

Pick up the wrong statement

A. In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator.

B. Slow or thermal neutrons have energy of the order or 0.025 eV

C. Fast neutrons have energies above 1000 eV

D. Fast reactor uses moderator

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The main interest of shielding in nuclear reactor is protection against

A. X-rays

B. Infrared rays

C. Neutrons and gamma rays

D. Electrons

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Superheated steam is generated in following reactor

A. Boiling water

B. Gas cooled

C. Pressurised water

D. All of the above

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A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

A. Slow down the speed of fast moving neutrons

B. Control the reaction

C. Reduce the temperature

D. Extracts heat from nuclear reaction

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Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

A. High neutron absorption cross-section

B. Low moderating efficiency

C. High neutron scatter cross-section

D. Low neutron absorption cross-section

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Artificial radioactive isotopes find application in

A. Power generation

B. Nucleonic devices

C. Nuclear fission

D. Medical field

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A fast breeder reactor uses following as fuel

A. Enriched uranium

B. Plutonium

C. Thorium

D. U₂₃₅

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Plutonium (Pu239) is produced

A. Artificially

B. When U238 is irradiated by neutrons

C. By fission of Th232

D. As basic raw material

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The function of control rods in nuclear plants is to

A. Control temperature

B. Control radioactive pollution

C. Control absorption of neutron

D. Control fuel consumption

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In order to have constant chain 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

A. Greater than 1.0

B. Less than 1.0

C. Equal to zero

D. Equal to 1.0

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Which of the following is the heaviest?

A. Neutron

B. Proton

C. Atom

D. Electron