RRB Science and Technology - Nuclear Technology
Exam Duration: 45 Mins Total Questions : 30
A pressurised water reactor employs pressuriser for the following application
- (a)
to maintain constant pressure in primary circuit under varying load
- (b)
to supply high pressure steam
- (c)
to increase pressure of water in primary circuit
- (d)
to provide subcooled water at high pressure
The risk of radioactive hazard is greatest in the turbine with following reactor
- (a)
Pressurised water
- (b)
boiling water
- (c)
gas cooled
- (d)
liquid metal cooled
Pick up the wrong statements
- (a)
In a heterogeneous or solid-fuel reactor, the fuel is mixed in regular pattern within moderator
- (b)
Slow or thermal neutrons have energy of the order 0.025 eV
- (c)
fast neutrons have energies above 1000 eV
- (d)
fast reactor uses moderator
Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal?
- (a)
Centrifugal
- (b)
Axial
- (c)
reciprocation
- (d)
Electromagnetic
The nuclear power plant at Tarantula has the following reactor
- (a)
fast breeder
- (b)
pressurised water
- (c)
boiling water
- (d)
sodium graphite
Boiling water reactor uses the following as moderator, coolant and working fluid
- (a)
ordinary fluid
- (b)
heavy water
- (c)
molten lead
- (d)
hydrogen gas
Ideally the neutron flux in reactor should be
- (a)
maximum in centre and zero at side
- (b)
maximum at and zero in centre
- (c)
uniform throughout
- (d)
zero throughout
In nuclear fission each neutron that causes fission releases
- (a)
no new neutron
- (b)
at least one new neutron
- (c)
one new neutron
- (d)
more than one new neutrons
The breeding gain case of thermal breeder reactor as compared to fast breeder reactor is
- (a)
same
- (b)
lower
- (c)
higher
- (d)
unity
Gas cooled reactor uses following materials as moderator and coolant
- (a)
graphite, CO2
- (b)
graphite, air
- (c)
heavy water, CO2
- (d)
lead, H2
Hydrogen is preferred as better coolant in comparison to CO2 because former
- (a)
is lighter
- (b)
is inert
- (c)
has high specific
- (d)
is a good conductor
The process by which a heavy nucleus is spitted into two light nuclei is known as?
- (a)
Splitting
- (b)
Fission
- (c)
Fusion
- (d)
disintegration
Heavy water production plants are located at
1. Nangal
2. Talcher
3. Hazira
4. Manuguru
Select the correct answer using the codes below
- (a)
1 and 2
- (b)
2 and 3
- (c)
1,2 and 3
- (d)
All of these
India is establishing new Nuclear Power plant with foreign2 nuclear reactor. These nuclear plants will be established at
1. Jaitapur
2. Mithi virdi
3. Haripur
4. Kovvada
Select tie correct answer using the codes given below
- (a)
1 and 2
- (b)
2 and 3
- (c)
1,2 and 3
- (d)
All of these
A nuclear unit becoming critical means
- (a)
It is generating power to rated capacity
- (b)
It is capable of generating much more than rated capacity
- (c)
There is danger of nuclear spread
- (d)
Chain reaction that causes automatic splitting of the fuel nuclei has been established
Moderator in nuclear plants is used to
- (a)
Reduce temperature
- (b)
Extract heat from nuclear reaction
- (c)
Control the reaction
- (d)
Cause collision with the fast moving neutrons to reduce their speed
Amongst the following, the fissionable materials are
- (a)
U233nadPu239
- (b)
U23iandPu233
- (c)
U235andPu235
- (d)
U238andPu239
Enriched uranium is one in which?
- (a)
Percentage of U235 has been artificially increased
- (b)
Percentage of U has been artificially increased
- (c)
Percentage of U234 has been artificially increased
- (d)
Extra energy is pumped from outside
Which of the following are ferrite materials?
- (a)
U233 AND Pu239
- (b)
U235 AND Th239
- (c)
U238 AND Pu239
- (d)
U238 AND Th239
Which of the following nuclear reactor does not need a heat exchanger for generation of steam?
- (a)
Gas cooled
- (b)
Liquid metal cooled
- (c)
Pressurised water
- (d)
Boiling water
Ferrite material is
- (a)
The most fissionable material
- (b)
The basic fuel for nuclear paints
- (c)
Basic raw material for nuclear plants
- (d)
The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
Which of the following particles is the lightest?
- (a)
Nucleus
- (b)
Electron
- (c)
Proton
- (d)
Meson
The commonly used material for shielding is
- (a)
Lead or concrete
- (b)
Lead and tin
- (c)
Graphite or cadmium
- (d)
Thick galvanised sheets
Fast breeder reactor uses
- (a)
Boiler
- (b)
Direct circuit of coolant system
- (c)
Double circuit system of coolant cycle
- (d)
Multi pass syatem
The main interest of shielding in nuclear reactor is protection against
- (a)
X-rays
- (b)
Infra-red ray
- (c)
a, P and y rays
- (d)
neutrons and gamma rays
Breeder reactor has a conversion ratio of
- (a)
Unity
- (b)
More than unity
- (c)
Less than unity
- (d)
Zero
Boiling water reactor employs
- (a)
Boiler
- (b)
Direct cycle of coolant system
- (c)
Double circuit system of coolant cycle
- (d)
Multi-pass system
Which is not identical for an atom and an isotope?
- (a)
Mass number
- (b)
Atomic number
- (c)
Chemical properties
- (d)
Position in periodic table
The energy required to be applied to a radioactive nucleus for the emission of a neutron is
- (a)
1 MeV
- (b)
2, 4 MeV
- (c)
4, 3 MeV
- (d)
7, 8 MeV
Reactors for propulsion applications use
- (a)
Natural uranium
- (b)
Molten lead
- (c)
Any form of uranium
- (d)
Thorium