Multiple Choice Questions and Answers on Nuclear Power Engineering
Question 1 : Hydrogen bomb employs the nuclear fusion of
- hydrogen
- deuterium
- tritium
- helium
Answer : 2
Question 2 : Sodium melts (at atmospheric pressure) at a temperature of __________ °C.
- 58
- 98
- 348
- 588
Answer : 2
Question 3 : The ratio of volume of an atom to that of its nucleus is
- 1012
- 10-12
- 10-8
- 108
Answer : 1
Question 4 : Research reactors are normally meant for
- producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on dif ferent materials.
- accelerating the neutrons.
- power generation.
- none of these
Answer : 1
Question 5 : Out of the followingplaces, a nuclear power plant is not located at
- Talcher (Orissa)
- Kaiga (Karnataka)
- Rawatbhata (Rajsthan)
- Kalpakkam (Tamilnadu)
Answer : 1
Question 6 : The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.
- electromagnetic
- reciprocating
- centrifugal
- volute
Answer : 1
Question 7 : Fast breeder Test Reactor (FBTR) is located at
- Kalpakkam (near Madras).
- Kota (in Rajasthan).
- BARC (Trombay).
- Tarapur (in Maharashtra).
Answer : 1
Question 8 : Tarapur atomic power station
- has two boiling water reactors of American design.
- has an installed capacity of 400 MW.
- is the first power reactor in India, which became critical in 1969.
- all (1), (2) and (3).
Answer : 4
Question 9 : In a nuclear explosion, the energy is released primarily in the form of __________ energy-
- potential
- thermal
- kinetic
- electrical
Answer : 3
Question 10 : The largest stable nucleus is
- U-235
- U-238
- Pb-206
- Bi-209
Answer : 1
Question 11 : Hydrogen has __________ isotopes.
- no
- one
- two
- three
Answer : 4
Question 12 : MeV is the unit of
- radioactivity
- energy
- potential difference
- none of these
Answer : 2
Question 13 : Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.
- 1
- 2200
- 3 x 1011
- 9 x 1021
Answer : 2
Question 14 : Energy equivlant to one atomic mass unit (amu) is __________ MeV.
- 9.31
- 93.1
- 931
- 9310
Answer : 3
Question 15 : “Critical mass” is the minimum mass of nuclear fissile material required for the
- sustainment of chain reaction.
- power generation on commercial scale.
- economic power generation.
- none of these.
Answer : 1
Question 16 : Which of the following is not, a fertile material ?
- Th-232
- U-238
- U-233
- none of these
Answer : 3
Question 17 : Molten sodium (as a coolant in fast breeder reactor)
- can’t attain high temperature at normal pressure.
- is not at all corrosive, even at a higher temperature.
- is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water.
- none of these
Answer : 3
Question 18 : Final product of uranium extraction plant at Jadugoda (Bihar) is
- uranium
- uranium oxide
- uranium carbide
- magnesium diuranate
Answer : 4
Question 19 : Which one is the radioactive isotope of hydrogen ?
- Deuterium
- Ortho-hydrogen
- Tritium
- None of these
Answer : 3
Question 20 : A homogeneous reactor is the one, in which the
- fissile atoms are evenly distributed throughout the mass of nuclear reactor.
- same substance (e.g. heavy water) is used as moderator & coolant.
- the fuel and the moderator is mixed to form a homogeneous material.
- all (1), (2) and (3).
Answer : 3
Question 21 : The atomic number of a radioactive element is not changed, when it emits __________ rays.
- α
- β
- γ
- α & β
Answer : 3
Question 22 : Fission of U-235 on slow neutron bombardment can be represented by
- 92U235 + 3 γ1
56Ba143 + 36Kr90
- 92U235 + 0n1
56Ba143 + 36Kr90 + 3 0n1
- 92U235 + 0n1
56Ba143 + 36Kr90 + 3 0n1 + Q (energy)
- 92U235 + 0n1
92U236 + 30n1+ Q (energy)
Answer : 3
Question 23 : A nuclear reactor can’t be used for
- the production of radioisotopes.
- supplying intense fields or beams of neutron for scientific experiments.
- marine ship propulsion.
- none of these.
Answer : 4
Question 24 : Which of the following is a moderating material used in nuclear reactor ?
- Graphite.
- Cadmium.
- Zircalloy (an alloy of zirconium and aluminium).
- Stainless steel.
Answer : 1
Question 25 : The atomic number of an element is equal to the number of __________ present in its atom.
- neutrons
- electrons
- protons
- either (2) or (3)
Answer : 4
Question 26 : Spent fuel from the nuclear thermal reactor contains
- fission products
- plutonium
- unused fuel
- all (1), (2) & (3)
Answer : 4
Question 27 : A boiling water reactor is the one, in which the
- coolant water is allowed to boil in the core of the reactor.
- coolant water, after being heated in the reactor core, generates steam in a boiler.
- pressurised water is pumped into the core.
- fuel and the coolant are thoroughly mixed to form a homogeneous solution.
Answer : 1
Question 28 : Which is used as a coolant in nuclear reactor due to its high capture cross-section ?
- H2
- N2
- He
- CO2
Answer : 1
Question 29 : Moderating material used in a thermal-reactor should be a
- good absorber of neutrons.
- solid substance.
- poor absorber of neutrons.
- none of these.
Answer : 3
Question 30 : Ordinary water is not used as a moderator because, it
- has a low absorption cross-section.
- has a low scattering cross-section.
- absorbs neutrons.
- does not absorb neutrons.
Answer : 3
Question 31 : Fast breeder reactors do not
- use Th-232 as fissile fuel.
- convert fertile material to fissile material.
- use fast neutrons for fission.
- use molten sodium as coolant.
Answer : 1
Question 32 : Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor.
- thermal
- fast breeder
- heavy water moderated
- enriched uranium
Answer : 2
Question 33 : Which of the following may not need a control rod ?
- Liquid metal cooled reactor.
- Fast breeder reactor.
- Candu reactor.
- None of these.
Answer : 4
Question 34 : One ‘amu’ is equivalent to
- 9.31 MeV
- 931 eV
- 931 Mev
- 931J
Answer : 3
Question 35 : Commercial power generation from fusion reactor is not yet possible, because
- it is difficult to control fusion reaction.
- the fuel required (e.g. deuterium and tritium) is scarce.
- it is difficult to initiate fusion reaction.
- quantity of fuel required for initiating fusion reaction is prohibitively high.
Answer : 1
Question 36 : The decay product of tritium (a beta emitter) is
- lithium
- helium
- deuterium
- hydrogen
Answer : 2
Question 37 : Heat is generated in a nuclear reactor (thermal) by
- combustion of a nuclear fuel e.g. uranium.
- fusion of atoms of uranium.
- absorption of neutrons in uranium atoms.
- fission of U-235 by neutrons.
Answer : 4
Question 38 : The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.
- 24
- 18
- 6
- 36
Answer : 2
Question 39 : Which of the following may not need a moderator ?
- Candu reactor
- Fast breeder reactor
- Homogeneous reactor
- Pressurised water reactor
Answer : 2
Question 40 : The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.
- 3.125
- 6.25
- 12.50
- 25
Answer : 2
Question 41 : Which is the most commonly used molten metal for cooling of nuclear reactors ?
- Calcium
- Sodium
- Mercury
- Zinc
Answer : 2
Question 42 : The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
- 1/2
- 1/4
- 1/8
- 1/16
Answer : 4
Question 43 : The second underground nuclear test was conducted by India at
- Jaisalmer
- Pokhran
- Kalpakkan
- Narora
Answer : 2
Question 44 : Which of the following is artificially produced as it does not occur in nature ?
- Uranium-235
- Uranium-233
- Plutonium-239
- Both (2) and (3)
Answer : 4
Question 45 : Gas cooling as compared to water cooling of nuclear reactors
- can not attain a high temperature.
- is more efficient as gas has a higher specific heat.
- can produce only saturated steam for feeding to power turbine.
- none of these.
Answer : 4
Question 46 : Which of the following may be used to measure the rate of nuclear disintegration?
- Geiger-Muller Counter
- Cyclotron
- Cold chamber
- Mass spectrograph
Answer : 1
Question 47 : The decrease in the atomic number is not observed in case of
- electron capture
- β-emission
- α-emission
- positron emission
Answer : 2
Question 48 : The mass number of an element is not changed, when it emits __________ radiations.
- α & β
- β & γ
- γ & α
- α, β, & γ
Answer : 2
Question 49 : Which of the following is not a naturally occurring nuclear fuel ?
- Uranium-238
- Thorium-233
- Plutonium-239
- None of these
Answer : 3
Question 50 : An electron has a mass that is approximately __________ that of the proton.
- 1836 (approximately)
- 1/1836 (approximately)
- 1
- ∞
Answer : 2