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


bCoolant water boils in the core of the reactor


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


dUse of moderator is not required



A fertile material is the one, which can be__________________?


aConverted into fissile material on absorption of neutron


bFissioned by slow (thermal) neutrons


cFissioned by fast neutrons


dFissioned by either slow or fast neutrons



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


aFuel & coolant


bFuel & moderator


cCoolant & moderator


dNone of these


View Answer Fuel & moderator

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


aCombustion of a nuclear fuel e.g. uranium


bFusion of atoms of uranium


cAbsorption of neutrons in uranium atoms


dFission of U-235 by neutrons



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


aExcellent moderating properties


bNeutron breeding capability


cFaster heat removal capability from the core


dCapability to increase the reaction rate in the core



A homogeneous reactor is the one, in which the___________________?


aFissile atoms are evenly distributed throughout the mass of nuclear reactor


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


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


dAll A., B. and C.



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


a141


b92


c233


d325


View Answer 141

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


aElectron


bα-particle


cProton


dNeutron


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


b1/4


c1/8


d1/16


View Answer 1/16

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


aProtons


bElectrons


cNeutrons


dNucleons


View Answer Nucleons

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