Chain reaction can be initiated
It becomes uncontrollable
It explodes
It produces no power
A. Chain reaction can be initiated
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
Greater than 1.0
Less than 1.0
Equal to zero
Equal to 1.0
Artificially
As basic raw material
When thorium is irradiated by neutrons
By fission of U₂₃₈
Chain reaction can be initiated
It becomes uncontrollable
It explodes
It produces no power
Return the neutrons back into the core
Shield the radioactivity completely
Check pollution
Conserve energy
U₂₃₃ and Pu₂₃₉
U₂₃₅ and Th₂₃₂
U₂₃₅ and Pu₂₃₈
U₂₃₃ and Pu₂₃₈
1 MeV
2.4 MeV
4.3 MeV
7.8 MeV
U₂₃₃ and Pu₂₃₉
U
U₂₃₈ and Pu₂₃₉
U₂₃₈ and Th₂₃₉
Fast
Slow
In bulk
Static
Natural uranium
Enriched uranium
Pure uranium
Any type of uranium
Same atomic number and different masses
Same chemical properties but different atomic numbers
Different masses and different atomic numbers
Different chemical properties and same atomic numbers
Infinite
Zero
Exactly balanced by the loss of neutrons through leakage
Initiated
More
Less
Same
Zero
Pressurised water
Boiling water
Gas cooled
Liquid metal cooled
1-99 %
1-25 %
1-50 %
1-75 %
Reduce temperature
Extract heat from nuclear reaction
Control the reaction
Cause collision with the fast moving neutrons to reduce their speed
For boiling pi water in the core
To use liquid sodium metal as coolant
To use intermediate coolant
To prevent the water coolant from boiling in the core
To maintain constant pressure in primary circuit under varying load
To Supply high pressure steam
To increase pressure of water in primary circuit
To provide sub cooled water at high pressure
X-rays
Infrared rays
Neutrons and gamma rays
Electrons
Mass number
Atomic number
Chemical properties
Position in periodic table
Same
More
Less
There is no such criterion
Enriched uranium
Plutonium
Thorium
U
Neutron
Proton
Atom
Electron
Used fuel should be reprocessed
Moderator should be used
Coolant should be employed
Control rods should be used
Rapidly increasing leading to the point of explosion
Decreasing from the specified value
Reduced to zero
Constant
Maximum in centre and zero at side
Maximum at side and zero in canter
Uniform throughout
Zero throughout
Boiling water
Gas cooled
Pressurised water
All of the above
MeV
Curie
Farads
MW
High energy (fast) neutrons alone
Low energy (slow) neutrons alone
Either fast or slow neutrons
Medium energy neutrons
Regenerative reactor
Fast breeder reactor
Breeder reactor
Boiling water reactor