POWER PLANT ENGINEERING QUIZ

Reactors for propulsion applications are designed for

Enriched uranium

Any form of uranium

Natural uranium

Plutonium

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A moderator

Accelerates neutrons

Does not absorb neutrons

Absorbs neutrons

None of these

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U235 will undergo fission by

Low energy(slow) neutrons alone

High energy(fast) neutrons alone

Medium energy neutrons

Either fast or slow neutrons

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Effective moderators are those materials which contain

Light weight atoms

Zero weight atoms

Critical atoms

Heavy weight atoms

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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

Less than 1.0

Greater than 1.0

Equal to 1.0

Equal to zero

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Enriched uranium is one in which

Extra energy is pumped from outside

Percentage of U₂₃₅ has been artificially increased

Percentage of U has been artificially increased

Percentage of U₂₃₄ has been artificially increased

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Natural uranium is made up of

99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄

99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅

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

99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈

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In triggering fission, the following types of neutrons are desirable

Neutrons at rest

Fast moving

Critical neutrons

Slow moving

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

Any one of the listed here

Pallets

Pins

Plates

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

Higher

Unity

Same

Lower

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