Chemical Engineering MCQs

Page No. 374

A heterogeneous reactor is the one, in which the moderator and the________________?


aCoolant are different materials


bCoolant are present in different phases (e.g., heavy water and graphite)


cFuel are present in different phases (e.g. uranium and heavy water)


dNone of these



Water is a better coolant than a gas (like CO2, He, N2 etc.), because it_________________?


aIs a better neutron moderator as well


bRequire comparatively smaller pumps and heat exchanger for a given heat transfer rate


cHas a better heat transfer characteristics, and it can be pressurised to attain a high temperature


dAll A., B. and C.


View Answer All A., B. and C.

Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of ____________ percent of U-235 (i.e. fissile material)?


a15


b45


c65


d85


View Answer 85

Primary purpose of a ____________ nuclear reactor is to supply a high neutron flux of the order of 1013 to 1014neutrons/cm2 second?


aResearch


bPower


cBreeder


dHomogeneous


View Answer Research

The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years?


a24


b18


c6


d36


View Answer 18

Heavy water is preferred over ordinary water as a coolant, because it?


aActs both as an efficient coolant as well as a moderator


bCan be heated to a higher temperature without pressurizing


cIs less prone to radiation damage


dAll A., B. and C.


View Answer All A., B. and C.

An ideal coolant for a nuclear reactor should ________________?


aBe a good absorber of neutrons


bBe capable of attaining high temperature, only when it is pressurised


cHave high density, but low heat transfer co-efficient


dBe free from radiation damage and non-corrosive



The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?


a1


b2


c3


d4


View Answer 3

The frequency at which maximum amplitude ratio is attained is called the ______________ frequency?


aCorner


bResonant


cCross-over


dNatural


View Answer Resonant

Thermocouple is suitable for measuring_________________?


aLiquid temperatures only


bVery high temperatures only


cVery low temperatures only


dBoth high and low temperatures



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