The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is
Plutonium
Uranium
Deuterium
Thorium
Correct Answer :
C. Deuterium
Related Questions
In nuclear fission
The original elements change into completely different elements
The electrons of the element change
The molecules rearrange themselves to form other molecules
None of the above
Effective moderators are those materials which contain
Light weight atoms
Heavy weight atoms
Critical atoms
Zero weight atoms
The process by which a heavy nucleus is spitted into two light nuclei is known as
Splitting
Fission
Fusion
Disintegration
Each fission of U₂₃₅ produces on the average _________ fast neutrons as a product of reaction.
2.46
24.6
246
2460
Isotopes of same elements have
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
A reactor capable of converting a ferrite material into fissile isotopes is called
Regenerative reactor
Fast breeder reactor
Breeder reactor
Boiling water reactor
A fission chain reaction in uranium can be developed by
Slowing down fast neutrons so that Uz fission continues by slow motion neutrons
Accelerating fast neutrons
Absorbing all neutrons
Using moderator
A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is
Same
More
Less
There is no such criterion
U235 will undergo fission by
High energy (fast) neutrons alone
Low energy (slow) neutrons alone
Either fast or slow neutrons
Medium energy neutrons
A nuclear fission produces energy of following order in MeV
20
200
2000
20,000
The following present serious difficulty in designing reactor shield
Alpha particles
Beta particles
Thermal neutrons
Fast neutrons and gamma rays
Reactors for propulsion applications are designed for
Any form of uranium
Natural uranium
Enriched uranium
Plutonium
Which of the following is the heaviest?
Neutron
Proton
Atom
Electron
Fast breeder reactor uses
Boiler
Direct cycle of coolant system
Double circuit system of coolant cycle
Multi passes system
Artificial radioactive isotopes find application in
Power generation
Nucleonic devices
Nuclear fission
Medical field
In order to have constant chain 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
Greater than 1.0
Less than 1.0
Equal to zero
Equal to 1.0
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be
Stable under nuclear radiation
Corrosion resistant
Good thermal conductor
All of these
The nuclear radiators produced in a reactor which must be shielded are
Electrons
α, β and γ rays
Neutron and gamma rays
None of these
Hydrogen is preferred as better coolant in comparison to CO₂ because former
Is lighter
Is inert
Has high specific heat
Is a good conductor
A moderator
Absorbs neutrons
Does not absorb neutrons
Accelerates neutrons
None of these
The risk of radioactive hazard is greatest in the turbine with following reactor
Pressurised water
Boiling water
Gas cooled
Liquid metal cooled
Uranium has isotopes
U₂₃₄
U₂₃₅
U₂₃₈
All of these
Pick up the wrong statement fast breeder reactors
Operate at extremely high power densities.
Are liquid metal cooled
Produce more fuel than they consume
Use water as coolant
Gas cooled reactor uses following materials as moderator, and coolant
Graphite, CO2
Graphite, air
Heavy water, CO2
Lead, H2
Which of the following statement is correct regarding the features of a Breeder reactor?
It produces more fuel than it consumes.
It requires highly enriched fuel.
It requires liquid sodium metal as moderator.
All of the above
Plutonium (Pu239) is produced
Artificially
When U238 is irradiated by neutrons
By fission of Th232
As basic raw material
The material most commonly used for shielding is
Carbon
Lead
Concrete
All of these
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
Heavy water
Graphite
Carbon dioxide
No moderator is needed
The coolant used in boiling water reactor is
CO2
Pressurised water
Mixture of water and steam
Liquid metal
Each fission of U₂₃₅ produces following number of fast neutrons per fission
1 neutron
3 neutrons
1, 2 neutrons
2 neutrons