456. In triggering fission, which type of neutrons are more effective
A.Fast
B.Slow
C.In bulk
D.Static
457. The size of the reactor is said to be critical when
A.Chain reaction can be initiated
B.It becomes uncontrollable
C.It explodes
D.It produces no power
458. When a reactor becomes critical, then the production of neutrons is
A.Infinite
B.Zero
C.Exactly balanced by the loss of neutrons through leakage
D.Initiated
459. In the breeder reactors the generation of new fissionable atom is
A.At the lower rate than the consumption
B.At a higher rate than the constuption
C.At an equal rate of the consumption
D.Depends on other considerations
460. The energy produced by a thermal reactor of same size as a breeder reactor is
A.Almost same
B.Slightly more
C.Slightly less
D.Much less
461. Reactors designed for propulsion applications are designed for
A.Natural uranium
B.Enriched uranium
C.Pure uranium
D.Any type of uranium
462. Supertheated steam is generated in following reactor
A.Boiling water
B.Gas cooled
C.Pressurised water
D.All of the above
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