Top Most Nuclear Power Plants Objective QuestionsÂ
1.Enriched uranium is one in which
%age of U235 has been artificially increased
%age of U has been artificially increased
%age of U234 has been artificially in-creased
extra energy is pumped from outside
all impurities have been removed.
ANSWER : s: a
2.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
it generates no heat.
ANSWER : : chain reaction that causes automatic splitting of the fuel nuclei has been established
3.The most commonly used moderator in nuclear plants is
heavy water
concrete and bricks
graphite and concrete
deuterium
graphite.
ANSWER : : graphite.
4.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
1000 tonnes of high grade coal.
ANSWER : : 4.5 tonnes of high grade coal
5.Which of the following are ferrite materials
U233andPu239
U
U238andPu239
U238andTh239
none of the above
ANSWER : : U
6.Boiling water reactor employs
boiler
direct cycle of coolant system
double circuit system of coolant cycle
multi pass system
single circuit system.
ANSWER : : direct cycle of coolant system
7.Breeder reactor has a conversion ratio of
unity
more than unity
less than unity
zero
infinity.
ANSWER : : more than unity
8.Fast breeder reactor uses
boiler
direct cycle of coolant system
double circuit system of coolant cycle
multi pass system
single circuit system.
ANSWER : : double circuit system of coolant cycle
9.The nuclear energy is measured as
MeV
curie
farads
MW
kWhr.
ANSWER : : MeV
10.Amongst the following, the fissionable materials are
U233andPu239
U23iandPu233
U235andPu235
U238andPu239
U243andPu235
ANSWER : : U233andPu239
11.The mass number of a substance represents the sum of total number of
protons and neutrons in an atom
protons and electrons in an atom
neutrons and electrons in an atom
protons and neutrons in a nucleus
protons and electrons in a nucleus.
ANSWER : : protons and neutrons in a nucleus
12.Which of the following particles is the lightest
nucleus
electron
proton
meson
neutron.
ANSWER : : electron
13.Moderator in nuclear plants is used to
reduce temperature
extract heat from nuclear reaction
control the reaction
cause collision with the fast moving neutrons to reduce their speed
moderate the radioactive pollution.
ANSWER : : cause collision with the fast moving neutrons to reduce their speed
14.The energy required to be applied to a radioactive nucleus for the emission of a neutron is
1 MeV
2.4 MeV
4.3 MeV
7.8 MeV
20 MeV.
ANSWER : : 7.8 MeV
15.Which of the following nuclear reactor does not need a heat exchanger for generation of steam
gas cooled
liquid metal cooled
pressurised water
boiling water
none of the above.
ANSWER : : boiling water
16.The main interest of shielding in nuclear reactor is protection against
X-rays
infra-red rays
a, P, and y rays
neutrons and gamma rays
electrons.
ANSWER : : neutrons and gamma rays
17.Which is not identical for an atom and an isotope
mass number
atomic number
chemical properties
position in periodic table
all of the above.
ANSWER : : mass number
18.Reflector in nuclear plants is used to
return the neutrons back into the core
shield the radioactivity completely
check polllution
conserve energy
is not used.
ANSWER : : return the neutrons back into the core
19.The commonly used material for shielding is
lead or concrete
lead and tin
graphite or cadmium
thick galvanized sheets
black carbon papers.
ANSWER : : lead or concrete
20.The number of isotopes of hydrogen are
1
2
U
3
0
ANSWER : : 3
21.Ferrite material is
the most fissionable material
the basic fuel for nuclear paints
basic raw material for nuclear plants
the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
none of the above.
ANSWER : : the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
22.The total energy released in fission of U is
5 MeV
10 MeV
199 MeV
168 MeV
11 MeV.
ANSWER : : 199 MeV
23.Atomic number of an element in the periodic table represents the numbers of
protons in the nucleus
electrons in me nucleus
neutrons in the nucleus
electrons in the atom
neutrons in the atom.
ANSWER : : protons in the nucleus
24.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
same chemical properties and same atomic numbers.
ANSWER : : same chemical properties but different atomic numbers
25.Which of the following is the heaviest
neutron
proton
atom
electron
nucleus.
ANSWER : : atom
26.The fast breeder reactor uses the following moderator
demineralised water
carbon dioxide
heavy water
graphite
no moderator is used.
ANSWER : : no moderator is used.
27.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
many-fold neutrons.
ANSWER : : more than one new neutrons
28.The unit of radio-activity is
electron-volt
electron-ampere
curie
MeV
AMU.
ANSWER : : curie
29.A reactor capable of converting a ferrite material into fissile isotopes is called
regenerative reactor
fast breeder reactor
breeder reactor
boiling water reactor
ferrite reactor.
ANSWER : : regenerative reactor
30.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
none of the above.
ANSWER : : more
31.The process by which a heavy nucleus is splitted into two light nuclei is known as
splitting
fission
fusion
disintegration
chain reaction.
ANSWER : : fission
32.The first unclear power plant in India is located at
Kota
Kalapakkam
Tarapur
Baraeilly
Kerala.
ANSWER : : Tarapur
33.The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is
same
lower
higher
unity
higher/lower depending on the size of reactor.
ANSWER : : lower
34.Gas cooled reactor uses following materials as moderator, and coolant
graphite, C02
graphite, air
heavy water, C02
lead, H2
concrete, N2.
ANSWER : : graphite, C02
35.Electron-volt is the unit of
atomic power
energy
voltage
radio activity
there is no such unit.
ANSWER : : energy
36.Natural uranium is made up of
99.282% U238, 0.712% U235, 0.006% U234
99.282% U235, 0.712% U238, 0.06%’ U234
99.282% U234, 0.712% U238, 0.006% U235
99.282% U235, 0.712% U234, 0.006% U238
none of the above.
ANSWER : : 99.282% U238, 0.712% U235, 0.006% U234
37.Uranium-233 is produced
as basic raw material
by neutron irradiation of Uz
by neutron irradiation of thorium
artificially
in high capacity furnaces.
ANSWER : : by neutron irradiation of thorium
38.A nuclear fission produces energy of following order in MeV
20
200
2000
20,000
2 x 105.
ANSWER : : 200
39.Plutonium is produced
as basic raw material
by neutron irradiation of Uz
by neutron irradiation of thorium
artificially
in high capacity furnace.
ANSWER : : by neutron irradiation of Uz
40.The nuclear power plant at Tarapur has the following reactor
fast breeder
pressurised water
boiling water
sodium graphite
none of the above.
ANSWER : : boiling water
41.Pick up the wrong statement Fast breeder reactors
operate at extremely high power densities.
are liquid-metal cooled
produce more fuel than they consume
are unmoderated
use water as coolant.
ANSWER : : use water as coolant.
42.Hydrogen is preferred as better coolant in comparison to C02 because former
is lighter
is inert
has high specific heat
is a good conductor
all of the above.
ANSWER : : has high specific heat
43.U238 will undergo fission by
high energy (fast) neutrons alone
low energy (slow) neutrons alone
either fast or slow neutrons
medium energy neutrons
none of the above.
ANSWER : : high energy (fast) neutrons alone
44.U235 will undergo fission by
high energy (fast) neutrons alone
low energy (slow) neutrons alone
either fast or slow neutrons
medium energy neutrons
none of the above.
ANSWER : : either fast or slow neutrons
45.The risk of radioactive hazard is greatest in the turbine with following reactor
pressurized water
boiling water
gas cooled
liquid metal cooled
all of the above.
ANSWER : : boiling water
46.Boiling water reactor uses the following as moderator, coolant and working fluid
ordinary fluid
heavy water
molten lead
hydrogen gas
none of the above.
ANSWER : : ordinary fluid
47.Enriched uranium may contain fissionable contents of the order of
1-99%
1-25%
1-50%
1-75%
1-90%.
ANSWER : : 1-99%
48.Ideally the neutron flux in reactor should be
maximum in centre and zero at side
maximum at side and zero in centre
uniform throughout
zero throughout
none of the above.
ANSWER : : uniform throughout
49.Pick up the wrong statement
In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.
Slow or thermal neutrons have energy of the order or 0.025 eV
Fast neutrons have energies above 1000 eV
Fast reactor uses moderator
Most serious drawback in using water as coolant in nuclear plants is its high vapor pressure.
ANSWER : : Fast reactor uses moderator
50.In triggering fission, which type of neutrons are more effective
fast
slow
in bulk
static
activated.
ANSWER : : slow
51.Solid- fuel for nuclear reactions may be fabricated into various small shapes such as
plates
pallets
pins
any one of the above
none of the above.
ANSWER : : any one of the above
52.The energy produced by a thermal reactor of same size as a breeder reactor is
almost same
slightly more
slightly less
much less
much more.
ANSWER : : much less
53.The function of control rods in nuclear plants is to
control temperature
control radioactive pollution
control absorption of neutron
control fuel consumption
none of the above.
ANSWER : : control absorption of neutron
54.Which of the following is the primary fuel
Ulii
U
U238
Pu:
Pu
ANSWER : : U
55.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
increases rate of reaction in core.
ANSWER : : transfers heat from core at a fast rate
56.Which of the following is more appropriate for a moderator. One which
does not absorb neutrons
absorbs neutrons
accelerates neutrons
eats up neutrons
regenerates neutrons.
ANSWER : : does not absorb neutrons
57.When a reactor becomes critical, then the production of neutrons is
infinite
zero
exactly balanced by the loss of neutrons through leakage
initiated
stopped.
ANSWER : : exactly balanced by the loss of neutrons through leakage
58.Effective moderators are those materials which contain
light weight atoms
heavy weight atoms
critical atoms
zero weight atoms
there is no such criterion.
ANSWER : : light weight atoms
59.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
reflector should be used.
ANSWER : : used fuel should be reprocessed
60.The following present serious difficulty in designing reactor shield
alpha particles
beta particles
thermal neutrons
fast neutrons and gamma rays
none of the above.
ANSWER : : fast neutrons and gamma rays
61.Which of the following can be used as a coolant in nuclear plant
light or heavy water
molten lead
carbon dioxide
freon
carbon tetrachloride.
ANSWER : : light or heavy water
62.In a fission process, maximum %age of energy is released as
kinetic energy of neutrons
kinetic energy of fission products
instantaneous release of gamma rays
gradual radioactive decay of fission products
none of the above.
ANSWER : : kinetic energy of fission products
63.Reactors for propulsion applications use
natural uranium
molten lead
any form of uranium
thorium
plutonium.
ANSWER : : molten lead
64.In triggering fission, the following types of neutrons are desirable
fast moving
slow moving
critical neutrons
neutrons at rest
none of the above.
ANSWER : : slow moving
65.Reactors designed for propulsion applications are designed for
natural uranium
enriched uranium
pure uranium
any type of uranium
none of the above.
ANSWER : : enriched uranium
66.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
enriching U235.
ANSWER : : slowing down fast neutrons so that Uz fission continues by slow motion neutrons
67.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.
opt 5
ANSWER : s: a
68.Which of the following is secondary fuel
Th232andU238
U233andPu239
U233andPu238
U233andPu238
opt 5
ANSWER : A pressurized water reactor employs pressurizer for the following application
69.In the breeder reactors the generation of new fissionable atom is
at the lower rate than the consumption
at a higher rate than the constuption
at an equal rate of the consumption
depends on other considerations
unpredictable.
ANSWER : : at a higher rate than the constuption
70.In order to have constant claim 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
equal to infinity.
ANSWER : : equal to 1.0
71.Superheated steam is generated in following reactor
boiling water
gas cooled
pressurized water
all of the above
none of the above.
ANSWER : : gas cooled
72.Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal
centrifugal
axial
reciprocation
electromagnetic
diaphragm.
ANSWER : : electromagnetic
73.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
it produces tremendous power.
ANSWER : : chain reaction can be initiated
74.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
decrease of speed of neutrons.
ANSWER : : decreased leakage of neutrons
75.The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is
higher cost of nuclear fuel
high initial cost
high heat rejection in condenser
lower temperature and pressure conditions
nuclear hazard risk.
ANSWER : : lower temperature and pressure conditions
76.Pressurized water reactor is designed
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 eliminate the coolant loop of the pressurized water.
ANSWER : : to prevent the water coolant from boiling in the core
77.A boiling water reactor uses following as fuel
enriched uranium
plutonium
thorium
U
natural uranium.
ANSWER : : enriched uranium
78.In boiling water reactor, moderator is
coolant itself
ferrite rod
graphite rod
liquid sodium metal
blanket of thorium.
ANSWER : : coolant itself
79.Artificial radioactive isotopes find application in
power generation
nucleonic devices
nuclear fission
nuclear fusion
medical field.
ANSWER : : medical field.
80.The coolant used in boiling water reactor is
C02
pressurized water
mixture of water and steam
liquid metal
mercury.
ANSWER : : mixture of water and steam
81.A fast breeder reactor
uses graphite rods as moderator
has powerful moderator
has no moderator
uses ferrite material as moderator
uses pressurized water as moderator.
ANSWER : : has no moderator
82.The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is
plutonium
uranium
deuterium
thorium
lithium.
ANSWER : s: c
83.A fast breeder reactor uses following as fuel
enriched uranium
plutonium
thorium
U235
natural uranium.
ANSWER : : U235
84.Half life of a radioactive isotope corresponds to the time required for half of the following to decay
electrons
protons
neutrons
nulceus
atom.
ANSWER : : atom.
86.A fast breeder reactor uses
90% U-235
U-238
U-235
Pu-239
U-239.
ANSWER : : 90% U-235
87.The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be
more
less
same
zero
negative, i.e. fuel would be generated.
ANSWER : s: b