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


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


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


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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