Mechanical Engineering MCQs

Page No. 159

The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is____________________?


aplutonium

✖


buranium

✖


cdeuterium

✓


dthorium

✖


View Answer deuterium

The presence of reflector in nuclear power plants results in___________________?


aincreased production of neutrons

✖


bcomplete absorption of neutrons

✖


ccontrolled production of neutrons

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ddecreased leakage of neutrons

✓



The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is__________________?


ahigher cost of nuclear fuel

✖


bhigh initial cost

✖


chigh heat rejection in condenser

✖


dlower temperature and pressure condi-tions

✓



The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be________________?


amore

✖


bless

✓


csame

✖


dzero

✖


View Answer less

A fission chain reaction in uranium can be developed by________________?


aslowing down fast neutrons so that Uz fission continues by slow motion neutrons

✓


baccelerating fast neutrons

✖


cabsorbing all neutrons

✖


dusing moderator

✖



In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?


agreater than 1.0

✖


bless than 1.0

✖


cequal to zero

✖


dequal to 1.0

✓


View Answer equal to 1.0

The following present serious difficulty in designing reactor shield_________________?


aalpha particles

✖


bbeta particles

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cthermal neutrons

✖


dfast neutrons and gamma rays

✓



In a fission process, maximum %age of energy is released as___________________?


akinetic energy of neutrons

✖


bkinetic energy of fission products

✓


cinstantaneous release of gamma rays

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dgradual readioactive decay of fission products

✖



In triggering fission, the following types of neutrons are desirable_________________?


afast moving

✖


bslow moving

✓


ccritical neutrons

✖


dneutrons at rest

✖


View Answer slow moving

Which of the following is more appropriate for a moderator. One which_________________?


adoes not absorb neutrons

✓


babsorbs neutrons

✖


caccelerates neutrons

✖


deats up neutrons

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