In fast breeder reactors
Any type of moderator can be used
Graphite is used as the moderator
Heavy water is used as the moderator
Moderator is dispensed with.
Correct Answer :
D. Moderator is dispensed with.
Related Questions
Breeder reactors employ liquid metal coolant because it
Acts as good moderator
Produces maximum steam
Transfers heat from core at a fast rate
Breeds neutrons
Which of the following can be used as a coolant in nuclear plant?
Light or heavy water
Molten lead
Carbon dioxide
Freon
In triggering fission, which types of neutrons are more effective?
Fast
Slow
In bulk
Static
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
Atomic number of an element in the periodic table represents the numbers of
Protons in the nucleus
Electrons in the nucleus
Neutrons in the nucleus
Electrons in the atom
Which of the following is more appropriate for a moderator? One which
Does not absorb neutrons
Absorbs neutrons
Accelerates neutrons
Eats up neutrons
Half life of a radioactive isotope corresponds to the time required for half of the following to decay
Electrons
Protons
Neutrons
Atom
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
The process by which a heavy nucleus is spitted into two light nuclei is known as
Splitting
Fission
Fusion
Disintegration
In nuclear fission each neutron that causes fission releases
No new neutron
At least one new neutron
One new neutron
More than one new neutron
The size of the reactor is said to be critical when
Chain reaction can be initiated
It becomes uncontrollable
It explodes
It produces no power
Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal
Centrifugal
Axial
Reciprocation
Electromagnetic
The presence of reflector in nuclear power plants results in
Increased production of neutrons
Complete absorption of neutrons
Controlled production of neutrons
Decreased leakage of neutrons
U235 will undergo fission by
High energy (fast) neutrons alone
Low energy (slow) neutrons alone
Either fast or slow neutrons
Medium energy neutrons
Plutonium is produced
As basic raw material
By neutron irradiation of Uz
By neutron irradiation of thorium
Artificially
The secondary fuel used in nuclear power plants is
U₂₃₃ and Pu₂₃₉
U₂₃₅ and Th₂₃₂
U₂₃₅ and Pu₂₃₈
U₂₃₃ and Pu₂₃₈
The total energy released in fission of U is
5 MeV
10 MeV
199 MeV
168 MeV
Superheated steam is generated in following reactor
Boiling water
Gas cooled
Pressurised water
All of the above
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
A fission chain reaction in uranium can be developed
By increasing the contents of U₂₃₅
By slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron
Both (A) and (B)
None of these
Plutonium (Pu239) is produced
Artificially
When U238 is irradiated by neutrons
By fission of Th232
As basic raw material
In the breeder reactors the generation of new fissionable atom is
At the lower rate than the consumption
At a higher rate than the consumption
At an equal rate of the consumption
Depends on other considerations
The efficiency of a nuclear power plant in comparison to a conventional thermal power plant is
Same
More
Less
May be less or mote depending on size
In natural uranium, the constituents of three naturally occuring isotopes are
U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%
U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%
U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%
U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%
Breeder reactor has a conversion ratio of
Unity
More than unity
Less than unity
Zero
In fast breeder reactors
Any type of moderator can be used
Graphite is used as the moderator
Heavy water is used as the moderator
Moderator is dispensed with.
Uranium has isotopes
U₂₃₄
U₂₃₅
U₂₃₈
All of these
Electron volt is the unit of
Atomic power
Energy
Voltage
Radio activity
A power plant giving least running cost of production of electrical power is
Steam power plant
Gas turbine power plant
Hydro electric power plant
Nuclear power plant
The energy released during the fission of one atom of Uranium 235 in million electron volts is about
100
200
300
400