JAVA EXCEPTIONS QUIZ

Moderator in nuclear plants is used to

Cause collision with the fast moving neutrons to reduce their speed

Control the reaction

Extract heat from nuclear reaction

Reduce temperature

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Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal

Electromagnetic

Axial

Centrifugal

Reciprocation

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Breeder reactor has a conversion ratio of

Less than unity

Unity

More than unity

Zero

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Reactors for propulsion applications are designed for

Plutonium

Enriched uranium

Natural uranium

Any form of uranium

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Plutonium is produced

By neutron irradiation of Uz

By neutron irradiation of thorium

Artificially

As basic raw material

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Enriched uranium may contain fissionable contents of the order of

1-99%

1-25%

1-75%

1-50%

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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

Equal to 1.0

Greater than 1.0

Less than 1.0

Equal to zero

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The following present serious difficulty in designing reactor shield

Thermal neutrons

Beta particles

Fast neutrons and gamma rays

Alpha particles

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Isotopes of same elements have

Same atomic number and different masses

Different chemical properties and same atomic numbers

Different masses and different atomic numbers

Same chemical properties but different atomic numbers

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A moderator generally used in nuclear power plants is

Heavy water

Graphite

Graphite and concrete

Concrete

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