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4

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

Correct Answer :

D. All of these


Related Questions

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Effective moderators are those materials which contain

A. Light weight atoms

B. Heavy weight atoms

C. Critical atoms

D. Zero weight atoms

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Each fission of U₂₃₅ produces following number of fast neutrons per fission

A. 1 neutron

B. 3 neutrons

C. 1, 2 neutrons

D. 2 neutrons

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4

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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4

The energy required to be applied to a radioactive nucleus for the emission of a neutron is

A. 1 MeV

B. 2.4 MeV

C. 4.3 MeV

D. 7.8 MeV

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4

Which of the following is the heaviest?

A. Neutron

B. Proton

C. Atom

D. Electron

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Reflector in nuclear plants is used to

A. Return the neutrons back into the core

B. Shield the radioactivity completely

C. Check pollution

D. Conserve energy

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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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U238 will undergo fission by

A. High energy (fast) neutrons alone

B. Low energy (slow) neutrons alone

C. Either fast or slow neutrons

D. Medium energy neutrons

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4

In the breeder reactors the generation of new fissionable atom is

A. At the lower rate than the consumption

B. At a higher rate than the consumption

C. At an equal rate of the consumption

D. Depends on other considerations

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4

The predominant isotope of the naturally occuring element is

A. U₂₃₅

B. U₂₃₈

C. Pu₂₃₃

D. Pu₂₃₉

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4

One gram of uranium will produce energy equivalent to approximately

A. 1 tonne of high grade coal

B. 4.5 tonnes of high grade coal

C. 10 tonnes of high grade coal

D. 100 tonnes of high grade coal

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4

The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is

A. Plutonium

B. Uranium

C. Deuterium

D. Thorium

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The presence of reflector in nuclear power plants results in

A. Increased production of neutrons

B. Complete absorption of neutrons

C. Controlled production of neutrons

D. Decreased leakage of neutrons

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U₂₃₃ is produced

A. Artificially

B. As basic raw material

C. When thorium is irradiated by neutrons

D. By fission of U₂₃₈

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Which of the following is the primary fuel?

A. U₂₃₃

B. U

C. U₂₃₈

D. Pu

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The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is

A. Same

B. Lower

C. Higher

D. Unity

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Natural uranium is made up of

A. 99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄

B. 99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄

C. 99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅

D. 99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈

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4

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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4

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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Solid fuel for nuclear reactions may be fabricated into various small shapes such as

A. Plates

B. Pallets

C. Pins

D. Any one of the above

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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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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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Reflector in nuclear power plants _________ neutron leakage.

A. Increases

B. Decreases

C. Have no effect on

D. None of these

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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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4

The control rods in the control system of nuclear reactors are used to

A. Absorb excess neutrons

B. Control fuel consumption

C. Control temperature

D. All of these

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4

In natural uranium, the constituents of three naturally occuring isotopes are

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

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

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

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

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4

A pressurised water reactor employs pressurises for the following application

A. To maintain constant pressure in primary circuit under varying load

B. To Supply high pressure steam

C. To increase pressure of water in primary circuit

D. To provide sub cooled water at high pressure

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4

A moderator generally used in nuclear power plants is

A. Graphite

B. Heavy water

C. Concrete

D. Graphite and concrete

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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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A nuclear reactor is said to be critical when the neutron population in the reactor core is

A. Rapidly increasing leading to the point of explosion

B. Decreasing from the specified value

C. Reduced to zero

D. Constant