Chemical Engineering MCQs

Page No. 365

In a pressurised water reactor (PWR), the___________________?


aFuel is natural uranium and heavy water acts both as moderator & coolant

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bCoolant water boils in the core of the reactor

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cCoolant water is pressurised to prevent bulk boiling of water in the core

✓


dUse of moderator is not required

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A fertile material is the one, which can be__________________?


aConverted into fissile material on absorption of neutron

✓


bFissioned by slow (thermal) neutrons

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cFissioned by fast neutrons

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dFissioned by either slow or fast neutrons

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In a homogeneous nuclear reactor, the _____________ are mixed together?


aFuel & coolant

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bFuel & moderator

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cCoolant & moderator

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dNone of these

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View Answer Fuel & moderator

Heat is generated in a nuclear reactor (thermal) by_________________?


aCombustion of a nuclear fuel e.g. uranium

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bFusion of atoms of uranium

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cAbsorption of neutrons in uranium atoms

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dFission of U-235 by neutrons

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Molten sodium is used as a coolant in a fast breeder reactor, because of its_________________?


aExcellent moderating properties

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bNeutron breeding capability

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cFaster heat removal capability from the core

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dCapability to increase the reaction rate in the core

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A homogeneous reactor is the one, in which the___________________?


aFissile atoms are evenly distributed throughout the mass of nuclear reactor

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bSame substance (e.g. heavy water) is used as moderator & coolant

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cThe fuel and the moderator is mixed to form a homogeneous material

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dAll A., B. and C.

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The number of neutrons in the nucleus of Uranium-233 (92U233) is _________________?


a141

✓


b92

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c233

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d325

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View Answer 141

Mass of a positron is same as that of a/an__________________?


aElectron

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bα-particle

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cProton

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dNeutron

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View Answer Electron

The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?


a1/2

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b1/4

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c1/8

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d1/16

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View Answer 1/16

An element having large number of ______________ is most easily subjected to nuclear fission?


aProtons

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bElectrons

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cNeutrons

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dNucleons

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View Answer Nucleons

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