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Current Affairs January 2024

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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

Correct Answer :

B. At a higher rate than the consumption


Related Questions

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4

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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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

U235 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 nuclear fission

A. The original elements change into completely different elements

B. The electrons of the element change

C. The molecules rearrange themselves to form other molecules

D. None of the above

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4

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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4

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

A. Does not absorb neutrons

B. Absorbs neutrons

C. Accelerates neutrons

D. Eats up neutrons

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4

A moderator

A. Absorbs neutrons

B. Does not absorb neutrons

C. Accelerates neutrons

D. None of these

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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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4

A boiling water reactor uses following as fuel

A. Enriched uranium

B. Plutonium

C. Thorium

D. U

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4

In triggering fission, which types of neutrons are more effective?

A. Fast

B. Slow

C. In bulk

D. Static

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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

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 predominant isotope of the naturally occuring element is

A. U₂₃₅

B. U₂₃₈

C. Pu₂₃₃

D. Pu₂₃₉

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4

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

Moderator in nuclear plants is used to

A. Reduce temperature

B. Extract heat from nuclear reaction

C. Control the reaction

D. Cause collision with the fast moving neutrons to reduce their speed

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4

The process by which a heavy nucleus is spitted into two light nuclei is known as

A. Splitting

B. Fission

C. Fusion

D. Disintegration

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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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4

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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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

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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4

Uranium has isotopes

A. U₂₃₄

B. U₂₃₅

C. U₂₃₈

D. All of these

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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

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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

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4

The material most commonly used for shielding is

A. Carbon

B. Lead

C. Concrete

D. All of these

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4

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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4

The size of the reactor is said to be critical when

A. Chain reaction can be initiated

B. It becomes uncontrollable

C. It explodes

D. It produces no power

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4

In boiling water reactor, moderator is

A. Coolant itself

B. Ferrite rod

C. Graphite rod

D. Liquid sodium metal

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4

In triggering fission, the following types of neutrons are desirable

A. Fast moving

B. Slow moving

C. Critical neutrons

D. Neutrons at rest

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4

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

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4

A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is

A. Same

B. More

C. Less

D. There is no such criterion