21.
Reflector in nuclear plants is used to
A
return the neutrons back into the core
B
shield the radioactivity completely
C
check polllution
D
conserve energy
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Reflector in nuclear plants is used to
return the neutrons back into the core
shield the radioactivity completely
check polllution
conserve energy
Reactors for propulsion applications use
natural uranium
molten lead
any form of uranium
thorium
Plutonium is produced
as basic raw material
by neutron irradiation of Uz
by neutron irradiation of throium
artificially
One gram of uranium will produce energy equivalent to approximately
1 tonne of high grade coal
4.5 tonnes of high grade coal
10 tonnes of high grade coal
100 tonnes of high grade coal
Moderator in nuclear plants is used to
moderate the radioactive pollution
extract heat from nuclear reaction
control the reaction
cause collision with the fast moving neutrons to reduce their speed
In nuclear fission each neutron that causes fission releases
no new neutron
at least one new neutron
one new neutron
more than one new neutrons
In boiling water reactor, moderator is
coolant itself
ferrite rod
graphite rod
liquid sodium metal
Hydrogen is preferred as better coolant in comparison to C02 because former
is lighter
is inert
has high specific heat
is a good conductor
Gas cooled reactor uses following materials as moderator, and coolant
graphite,
graphite, air
heavy water,
lead,
For economical operation of a nuclear plant
used fuel should be reprocessed
moderator should be used
coolant should be employed
control rods should be used
Fast breeder reactor uses
boiler
direct cycle of coolant system
double circuit system of coolant cycle
multi pass system
Breeder reactor has a conversion ratio of
unity
more than unity
less than unity
zero
Boiling water reactor employs
boiler
direct cycle of coolant system
double circuit system of coolant cycle
multi pass system
Amongst the following, the fissionable materials are
U-233 and Pu-239
U-23i and Pu-233
U-235 and Pu-235
U-238 and Pu-239
A reactor capable of converting a ferrite material into fissile isotopes is called
regenerative reactor
fast breeder reactor
breeder reactor
boiling water reactor
A nuclear unit becoming critical means
it is generating power to rated capacity
it is capable of generating much more than rated capacity
there is danger of nuclear spread
chain reaction that causes automatic splitting of the fuel nuclei has been established
A nuclear fission produces energy of following order in MeV
20
200
2000
20000
A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is
same
more
less
none of the above