Chemical Engineering MCQs

Page No. 362

Coolant used in a boiling water reactor is________________?


aHydrogen gas

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bWater

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cSteam

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dA mixture of water & steam

✓



The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?


a1

✓


b0.5

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c2

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d4

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View Answer 1

A radioactive substance does not emit________________?


aα-ray

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bProton

✓


cPosition

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dβ-ray

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View Answer Proton

Thermal shield is used in high powered nuclear reactors to__________________?


aProtect the walls of the reactor from radiation damage

✓


bAbsorb the fast neutrons

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cSlow down the secondary neutrons

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dProtect the fuel element from coming in contact with the coolant

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Commercial power generation from fusion reactor is not yet possible, because___________________?


aIt is difficult to control nuclear fusion reaction

✓


bThe fuel required (i.e., deuterium & tritium) is scarce

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cIt is difficult to initiate fusion reaction

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dQuantity of fuel required for initiating fusion reaction is prohibitively high

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Molten sodium (as a coolant in fast breeder reactor) ?


aCan’t attain high temperature at normal pressure

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bIs not at all corrosive, even at a higher temperature

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cIs highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water

✓


dNone of these

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Out of the following, nucleus of _____________ atom contains the largest number of neutrons?


aU-235

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bU-238

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cU-239

✓


dPu-239

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View Answer U-239

The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?


a3.125

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b6.25

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c12.50

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d25

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View Answer 6.25

Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?


aX

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bα and β

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cNeutrons & gamma

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dInfrared

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View Answer Neutrons & gamma

Which of the following is a moderating material used in nuclear reactor ?


aGraphite

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bCadmium

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cZircaloy (an alloy of zirconium and aluminium)

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dStainless steel

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View Answer Graphite

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