Chemical Engineering MCQs

Page No. 374

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


aCoolant are different materials

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

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

✓


dNone of these

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


aIs a better neutron moderator as well

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

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

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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

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b45

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c65

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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

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cBreeder

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dHomogeneous

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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

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d36

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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

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bCan be heated to a higher temperature without pressurizing

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cIs less prone to radiation damage

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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

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

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cHave high density, but low heat transfer co-efficient

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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

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b2

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c3

✓


d4

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View Answer 3

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


aCorner

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bResonant

✓


cCross-over

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dNatural

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View Answer Resonant

Thermocouple is suitable for measuring_________________?


aLiquid temperatures only

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bVery high temperatures only

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cVery low temperatures only

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dBoth high and low temperatures

✓



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