519. Boiling water reactor uses the following as moderator, coolant and working fluid
A.Ordinary fluid
B.Heavy water
C.Molten lead
D.Hydrogen gas
520. Ideally the neutron flux in reactor should be
A.Maximum in centre and zero at side
B.Maximum at side and zero in centre
C.Uniform throughout
D.Zero throughout
521. Enriched uranium may contain fissionable contents of the order of
A.1-99%
B.1-25%
C.1-50%
D.1-75%
522. U235 will undergo fission by
A.High energy (fast) neutrons alone
B.Low energy (slow) neutrons alone
C.Either fast or slow neutrons
D.Medium energy neutrons
523. U238 will undergo fission by
A.In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.
B.(a) high energy (fast) neutrons alone
C.(b) low energy (slow) neutrons alone
D.(c) either fast or slow neutrons
524. A reactor capable of converting a ferrite material into fissile isotopes is called
A.Regenerative reactor
B.Fast breeder reactor
C.Breeder reactor
D.Boiling water reactor
525. Natural uranium is made up of
A.99.282% U238, 0.712% U235, 0.006% u234
B.99.282% U235, 0.712% U238, 0.06% u234
C.99.282% U234, 0.712% U238, 0.006% U235
D.99.282% U235, 0.712% U234, 0.006% U238
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