Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

LLW stands for ____________(a) Low Level Water(b) Low Laser width(c) Low Level Waste(d) Loss of Levels in waterI had been asked this question in an international level competition.I would like to ask this question from Disposal of Nuclear Waste topic in portion Nuclear Power Plant of Energy Engineering

Answer»

The correct option is (c) Low Level Waste

To explain: Low Level Waste CONTAINS less than 10 nCi per gram of transuranium CONTAMINANTS CONTAINING low but potentially hazardous concentrations of radioactive MATERIALS. These are generated in almost all activities involving radioactive materials, require little or no shielding.

2.

Nuclear plant is located near the area where cooling water is available.(a) True(b) FalseI got this question by my school principal while I was bunking the class.I'm obligated to ask this question of Types of Nuclear Reactor & Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (a) True

To explain: Some of the MAJOR factors to locate a nuclear station considered are, Availability of cooling water, transportation facilities, Distance from LOAD centre, safety, radioactive WASTE, disposal facility and foundation requirement.

3.

How is High Level solidified nuclear wastes (HLW) stored?(a) Concrete tanks(b) Canisters(c) Packed rock salt(d) Soil binsThe question was posed to me at a job interview.My query is from Disposal of Nuclear Waste topic in chapter Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (b) Canisters

Best explanation: The solidified waste is placed in canisters that are STORED in holes formation for thousands of years. The solidified waste is placed in canisters that are stored in holes drilled in ROCK salt with a spacing of 10 m to allow EFFICIENT dissipation of energy without exceeding temperature LIMITS of either CANISTER or salt. Each canister requires 100 m^2 of salt for cooling.

4.

Select the incorrect statement about PWR.(a) High primary circuit pressure requires a strong pressure vessel(b) Corrosion is less in PWR(c) During fuel charging in PWR, the reactor has to be shut down at least for a month(d) PWR results in uneven heatingThis question was posed to me during an interview.Enquiry is from Types of Nuclear Reactor & Nuclear Waste topic in portion Nuclear Power Plant of Energy Engineering

Answer»

Correct option is (b) Corrosion is less in PWR

Easy explanation: Presence of HIGH temperature and high PRESSURE water, the corrosion is severe. This means USE of stainless steel adds to further costing. When γ- radiations PASS through the pressure vessel it results in uneven heating which induces thermal STRESSES on vessels.

5.

What types of rays are trapped by shielding?(a) Gamma rays(b) Beta rays(c) X-rays(d) IR raysThis question was posed to me in an internship interview.The above asked question is from Nuclear Reactor Components topic in chapter Nuclear Power Plant of Energy Engineering

Answer»

Correct option is (a) Gamma rays

The explanation: SHIELDING prevents the passage of radiation to the outside of the reactor. The primary shield prevents the leakage of neutron and gamma radiation present in the cooling CIRCUITS due to ACTIVATION of COOLANT as passes through the CORE.

6.

Tailings forms are the residues from ____________(a) Uranium(b) Thorium(c) Cadmium(d) BoronI had been asked this question during a job interview.I need to ask this question from Disposal of Nuclear Waste in portion Nuclear Power Plant of Energy Engineering

Answer»

Correct OPTION is (a) URANIUM

The best I can explain: Tailings are residues from uranium mining and milling operations. They CONTAIN LOW concentration of naturally OCCURRING radioactive materials. They are generated in large volumes and are stored at the mine or mill sites.

7.

For how many days is radioactive solid waste kept is kept under water at 6m deep for initial cooling?(a) 15 days(b) 50 days(c) 30 days(d) 100 daysThe question was posed to me in an interview for job.This is a very interesting question from Disposal of Nuclear Waste topic in portion Nuclear Power Plant of Energy Engineering

Answer»

The correct ANSWER is (d) 100 days

Easiest explanation: It is necessary to KEEP the radioactive solid waste first in the water of 6M depth nearly for 100 days. It was FOUND that after 100 days cooling of radioactive waste of 28MW plant in water still has a radioactivity equal to million grams of radium. About 50% radioactive elements disappear during cooling.

8.

What are the ways in which most of radio activeness is removed?(a) Infusing them with other metal(b) Neutralizing them by diluting in chemical solutions(c) Storing them(d) Segregating them into small packsThis question was addressed to me during an online interview.I want to ask this question from Disposal of Nuclear Waste in chapter Nuclear Power Plant of Energy Engineering

Answer»

The correct choice is (C) Storing them

For explanation I would say: Most of the radio activeness of waste is removed just by storage. The storage problem is SIMPLIFIED by SEPARATING cersium and strontium which are extremely RADIOACTIVE. These are generally stored in tanks which are buried in ground and then disposed in to the SEA after 13 years of storage.

9.

How are active liquids of nuclear waste disposed?(a) Stored in concrete tanks and buried underground(b) Stored in concrete tanks and buried in sea(c) Mixed with other chemicals and left into free atmosphere(d) They are reused and burnt away in gaseous fumesI got this question in final exam.Origin of the question is Disposal of Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer»

Correct OPTION is (a) Stored in CONCRETE tanks and buried underground

For explanation: Active liquids are kept in concrete tanks and these tanks are buried in the ground TILL their decay of radio ACTIVITY. Many times the radio activity increases the temperature of the liquid WASTE or sometimes these liquids boil and the activity decreases with time.

10.

Which type of disposal of nuclear waste is cheapest and easiest method of all?(a) Ground(b) Air(c) Space(d) WaterI had been asked this question during a job interview.Query is from Disposal of Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer» RIGHT option is (a) Ground

The best explanation: This is one of the easy and cheapest methods of disposal because SOIL absorbs radioactive MATERIAL easily. This disposal is suitable mostly in areas of low rainfall at points which are high above the ground water LEVEL.
11.

A 400 MW nuclear power station would produce a equivalent radium of _____________(a) 100 tons daily(b) 1000 tons daily(c) 500 tons daily(d) 10 tons dailyThis question was posed to me in a job interview.My question is from Disposal of Nuclear Waste topic in chapter Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (a) 100 tons DAILY

To explain: The radio-active PRODUCTS of a 400MW power station would be EQUIVALENT to 100 tons of radium daily and the radioactive effect of this plant product if exposed to atmosphere would kill all the living organisms WITHIN the area of about 100 sq miles.

12.

Absorption of radioactive element by human, affects their offspring’s.(a) True(b) FalseThe question was asked in an interview.I'd like to ask this question from Disposal of Nuclear Waste in chapter Nuclear Power Plant of Energy Engineering

Answer»

Right option is (a) True

Easiest explanation: Absorption of neutron or radioactive element by a tissue nucleus leads to radioactive nucleus which results change in chemical nature, mal-functioning of cell. Due to this, cell damages leading to genetic modification. Inhale of radioactive material through AIR, food and WATER result RADIATION hazard.

13.

Can vacated coal mines be used for waste disposal.(a) True(b) FalseThe question was posed to me in exam.Question is taken from Disposal of Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer» RIGHT choice is (a) True

To explain: YES, vacated coal mines can be used for waste disposal. The wastes are DISPOSED in the salt HEAPS provided in the mines, because salt is a powerful absorber of radioactive emissions. It will be easy and more economical method to dispose of liquid waste by FREEZING.
14.

What are released into biosphere from nuclear power plants?(a) Gaseous effluents(b) Waste Product(c) Smoke(d) The obtained productThis question was posed to me in semester exam.This is a very interesting question from Disposal of Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer»

Correct ANSWER is (a) Gaseous effluents

The explanation: Under normal operation, gaseous effluents are released slowly from the power PLANTS into the biosphere and BECOME diluted and dispersed harmlessly. RELEASING at slow RATES gives it time to blow of slowly.

15.

Moderate liquid nuclear wastes are disposed into ___________(a) Deep pits(b) Buried underground(c) Left into rivers(d) Left into deep oceansThis question was posed to me in a job interview.Question is taken from Disposal of Nuclear Waste in chapter Nuclear Power Plant of Energy Engineering

Answer»

Correct CHOICE is (a) Deep pits

To explain: Moderate liquid wastes after PRELIMINARY treatments are discharged in deep pits or day well from which they sweep out into the surrounding. Certainly liquid wastes are mixed with some KIND of other chemical in order to lower their radioactivity.

16.

How are moderate active solid wastes disposed?(a) Buried underground(b) Buried under sea(c) Sent to outer space(d) Left out in streams or riversI got this question in semester exam.This question is from Disposal of Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer»

Correct choice is (a) Buried underground

For explanation: In a nuclear FUEL CYCLE, the solid, liquid and gaseous radioactive wastes are produced at DIFFERENT stages. These radioactive wastes must be disposed off in such a manner that there is no hazard to the human and PLANT life. Moderate active solid wastes are buried in the ground.

17.

What is the major problem in nuclear plants?(a) Drawing out energy(b) Fusion of particles(c) Disposal of nuclear waste(d) Handling of fuelThe question was asked by my college director while I was bunking the class.This intriguing question comes from Disposal of Nuclear Waste in portion Nuclear Power Plant of Energy Engineering

Answer» CORRECT answer is (c) Disposal of nuclear waste

The best explanation: One of the MAJOR problems in the nuclear power PLANT is the disposal of waste PRODUCTS which are highly radioactive. They emit large quantities of γrays and these high energy γ rays destroy all living matter through which pass.
18.

CANDU stands for ____________(a) Canadian Natural Darmstadtium Uranium(b) Canadian Natural Deuterium Uranium(c) Canadian Natural Dubnium Uranium(d) Canadian Natural Dysprosium UraniumI had been asked this question by my school principal while I was bunking the class.The above asked question is from Types of Nuclear Reactor & Nuclear Waste in section Nuclear Power Plant of Energy Engineering

Answer» RIGHT choice is (b) Canadian NATURAL Deuterium URANIUM

The explanation: The CANDU, for Canada Deuterium Uranium, is a Canadian pressurized heavy water reactor DESIGN used to generate electricity. The acronym refers to its deuterium oxide (heavy water) moderator and its use of (ORIGINALLY natural) Uranium fuel.
19.

What is the approx cost of disposing nuclear waste into sea per cubic meter?(a) 50 rs(b) 300 rs(c) 500 rs(d) 1000 rsI have been asked this question in an online interview.This is a very interesting question from Disposal of Nuclear Waste topic in portion Nuclear Power Plant of Energy Engineering

Answer»

The correct CHOICE is (b) 300 rs

The best explanation: In many places the liquid WASTE is DISPOSED off to the SEA through the pipes carried from the plant to the point of disposal. While disposing into the sea it should be seen that the activity level should not affect the MARINE life. The approximate cost of disposal by this method is 300 rs per cubic meter.

20.

Which parts function is to reduce the energy of fast neutrons to thermal neutrons in nuclear power plant?(a) Moderator(b) Coolant circulator(c) Control rods(d) ShieldingThis question was addressed to me by my college director while I was bunking the class.Origin of the question is Nuclear Reactor Components in division Nuclear Power Plant of Energy Engineering

Answer» CORRECT answer is (a) Moderator

The explanation is: FUNCTION of moderator is to reduce the energy of fast neutrons to THERMAL neutrons. Due to HIGH energy of fission neutrons relative to that required to trigger another fission event their probability of INTERACTING with U^235 is small.
21.

How many number of nuclei of hydrogen fuse in a series of reaction involving other particles that continually appear and disappear?(a) 1(b) 2(c) 3(d) 4This question was posed to me by my school principal while I was bunking the class.The doubt is from Nuclear Fission & Nuclear Fusion topic in chapter Nuclear Power Plant of Energy Engineering

Answer»
22.

How many types of Boiling water reactor cycles are there?(a) 2(b) 3(c) 4(d) 5This question was posed to me in a national level competition.This intriguing question originated from Types of Nuclear Reactor & Nuclear Waste in portion Nuclear Power Plant of Energy Engineering

Answer»

The CORRECT OPTION is (b) 3

Explanation: There are three different types of BWR cycles commonly used:

 Single cycle internal circulation: This system uses internal recirculation system to generate POWER ranging from 50- 100 MW.

 Single cycle forced circulation: This type uses a forced circulation system using a circulation system using a CIRCULATING pump. The heat in the reactor is used to generate steam.

 Dual cycle forced circulation: this arrangement has two cycles, steam cycle and gas cycle.

23.

Which reactor uses orthometaerhenyl and paratherphenyl as coolant and moderator?(a) Liquid metal fast breeder reactor(b) Gas cooled fast breeder reactor(c) Organic substance cooled reactor(d) CANDU Heavy water reactorI had been asked this question during an online exam.Origin of the question is Types of Nuclear Reactor & Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer»

The correct OPTION is (c) Organic substance cooled REACTOR

The best I can explain: Organic substance cooled reactor uses enriched uranium as FUEL and a mixture of orthometaterhenyl and PARATHERPHENYL as coolant and moderator, and boron control rods, generating 11.4 MW CAPACITIES with an overall efficiency of 25%.

24.

90Th^232 is fertile isotope produced by fission.(a) True(b) FalseThe question was asked in homework.I need to ask this question from Nuclear Reactor Components in chapter Nuclear Power Plant of Energy Engineering

Answer»

The correct choice is (a) True

For explanation: 90Th^232 is a fertile isotope produced by NUCLEAR fission. 90Th has 6 naturally occurring isotopes, NONE of these isotopes are stable; however, one isotope, ^232Th is RELATIVELY stable, with a half life of 1.405× 10^10 years, considerably longer than the age of earth.

25.

Why neutrons with lower energy should be capable of causing fission?(a) For faster reaction process(b) For sustained reaction process(c) For Safety purpose(d) In order to not waste the nuclear fuelThe question was asked in an internship interview.This interesting question is from Nuclear Fission & Nuclear Fusion in chapter Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (b) For sustained reaction process

For explanation: Due to COLLISIONS with various nuclei, initial high KINETIC energy of fission NEUTRON decreases. Thus for a sustained reaction, eve neutrons with lower energy should be CAPABLE of causing fission. Only neutrons can result in sustained reaction as two or THREE neutrons are released for each one absorbed by fission.

26.

What is used in nuclear reactor as a cooling method/device?(a) Coolant(b) Water jackets(c) Air cooler(d) Air ventsI got this question in a job interview.Question is from Nuclear Reactor Components in division Nuclear Power Plant of Energy Engineering

Answer»

Correct CHOICE is (a) Coolant

To explain: The coolant is used and its function is to remove the heat released by fission. The coolant should have high SPECIFIC heat, high conductivity, GOOD chemical stability, good pumping characteristics and low neutron ABSORPTION cross section. Coolant can either be liquid or GAS.

27.

What makes the best moderators in nuclear power plant?(a) Material with low atomic number(b) Materials with low atomic mass(c) Materials with high atomic number(d) Materials with high mass numberThe question was posed to me in my homework.This intriguing question comes from Nuclear Reactor Components topic in portion Nuclear Power Plant of Energy Engineering

Answer» CORRECT answer is (a) Material with low atomic number

To explain: The moderator slows down the NEUTRONS to thermal energies by collision with inert ATOMS (scattering). Speed of the neutrons is reduced within a SMALL number of collisions as the moderator possesses a high scattering cross section. Materials with low atomic mass number make BEST moderators.
28.

Which of the following element is readily available in the ordinary water?(a) Cesium(b) Thorium(c) Deuterium(d) AstatineThe question was posed to me by my college director while I was bunking the class.Query is from Nuclear Fission & Nuclear Fusion in section Nuclear Power Plant of Energy Engineering

Answer»

Right OPTION is (c) Deuterium

The best I can EXPLAIN: Deuterium used in fusion reaction is readily available in ORDINARY water (Out of 6500 molecules). Deuterium is also known as heavy hydrogen. The NUCLEUS of deuterium is called as deuteron, Contains one proton and one NEUTRON.

29.

Atoms of different chemical elements that have the same number of nucleons are called as?(a) Isobars(b) Isotones(c) Isomers(d) IsotopesI had been asked this question in final exam.I need to ask this question from Nuclear Fission & Nuclear Fusion topic in division Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (a) Isobars

To explain: Atoms of different chemical elements that have the same number of nucleons are called as isobars. The term ISOBAR was suggested by Alfred WALTER STEWART in 1918. It is derived from GREEK word ‘isos’ meaning EQUAL and ‘baros’ meaning WEIGHT.

30.

Electrons that orbit outermost shell of an atom are called?(a) Valence electrons(b) Electrons(c) Electron Coefficients(d) NeutronsThis question was posed to me in a job interview.This interesting question is from Atomic Structure topic in chapter Nuclear Power Plant of Energy Engineering

Answer»

Correct option is (a) Valence ELECTRONS

For explanation: Electrons that orbit outermost shell of an ATOM are CALLED Valence electrons. The outermost shell is called valence shell. The presence of valence electron can DETERMINE the element’s chemical properties.

31.

The total number of nucleons in the nucleus is called _________(a) Atomic number(b) Mass number(c) Electric charge(d) Periodic numberThe question was posed to me during a job interview.The query is from Atomic Structure in portion Nuclear Power Plant of Energy Engineering

Answer»

Correct option is (b) Mass NUMBER

Easiest explanation: The total number of nucleons in the nucleus is called the mass number A. Nuclear symbols are written as zX^A Where X is chemical symbol. The masses of ATOMS are compared on a SCALE in which an isotope of 6C^12 has a mass of exactly 12.

32.

On which law is the nuclear energy explained?(a) Einstein’s law(b) Newton’s law(c) Rutherford law(d) Mendeleev lawI have been asked this question in a national level competition.My question comes from Atomic Structure in chapter Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (a) Einstein’s law

To elaborate: The nuclear energy is explained the basis of Einstein’s law, ONE atom MAY be transformed into ANOTHER by losing or ACQUIRING some of the above sub-particles. This results in mass change Δm and enormous AMOUNT of energy is released (or absorbed).According to Einstein’s law,

ΔE = Δmc^2

Where, c=light of speed.

33.

How much amount of nuclear energy burnt is equivalent to the energy produced by 3000 tonnes of coal?(a) 1kg(b) 5kg(c) 15kg(d) 20kgI have been asked this question in exam.My question is based upon Atomic Structure topic in section Nuclear Power Plant of Energy Engineering

Answer»

Correct choice is (a) 1kg

For explanation I would say: The amount of heat generated by burning one kg of NUCLEAR fuel is EQUIVALENT to the ENERGY generated by burning 3000 tonnes of coal or 1600 tonnes of OIL. The production of Nuclear energy is carried out by two methods which are nuclear fission and nuclear FUSION.

34.

Which country inventedCANDU heavy water reactor?(a) Canada(b) Germany(c) Russia(d) BoliviaThe question was posed to me during an internship interview.This is a very interesting question from Types of Nuclear Reactor & Nuclear Waste in section Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (a) Canada

To explain I would say: The CANDU is a Canadian pressurized heavy water reactor design used to generate ELECTRIC POWER. Heavy water nuclear reactors and LIGHT water nuclear reactors differ in how they create and manage the complex physics of nuclear fission or atom-splitting which produces the energy and HEAT to create steam to DRIVE generators.

35.

Which of the following part in a nuclear reactor minimizes the neutron leakage?(a) Shield(b) Control rods(c) Reflector(d) ModeratorThe question was posed to me during an internship interview.My doubt stems from Nuclear Reactor Components in chapter Nuclear Power Plant of Energy Engineering

Answer»

Correct choice is (c) REFLECTOR

For explanation I WOULD say: Function of the reflector is to minimize the neutron leakage by REFLECTING them back into the reactor. The MATERIAL used for reflector is same as that used for moderator. It scatters the neutrons that leak from core and RETURNS the neutrons back into core by reflecting them.

36.

PWR stands for ________(a) Power(b) Partially weathered rock(c) Pressurized water Reactor(d) Packaging waste regulationsThis question was addressed to me in my homework.This question is from Types of Nuclear Reactor & Nuclear Waste topic in chapter Nuclear Power Plant of Energy Engineering

Answer»

Right choice is (C) PRESSURIZED water REACTOR

Easy explanation: PWR stands for pressurized water reactor. A PWR power plant consists of two loops in series. One is the coolant LOOP called primary loop and other is the water STEAM or working fluid loop. Pressurized water reactor falls under the category of light water reactor.

37.

Heavy nuclei must be such that they can be fissioned by neutrons of an energy such substance are called?(a) Fission fragments(b) Fission Neutrons(c) Fission species(d) Fission elementsI got this question during an online exam.This intriguing question comes from Nuclear Fission & Nuclear Fusion topic in division Nuclear Power Plant of Energy Engineering

Answer» CORRECT answer is (C) Fission species

For explanation: HEAVY nuclei must be such that they can be fissioned by neutrons of energy such substance are called Fission species. All fission species should have long half LIVES so that the rate of decay is not so fast.
38.

How is tritium made from sea water?(a) By bombarding lithium(b) By bonding with carbon(c) By bombarding Beryllium(d) By reacting with oxygenI have been asked this question in final exam.This interesting question is from Nuclear Fission & Nuclear Fusion topic in section Nuclear Power Plant of Energy Engineering

Answer»

Correct option is (a) By BOMBARDING lithium

To ELABORATE: Tritium is MADE by seawater by bombarding with lithium. Lithium is a chemical element with ATOMIC NUMBER: 3 and Mass number: 6.941 u ±0.002 u. Because of its relative nuclear instability, lithium is less common in the solar system.

39.

In which of the following process are Neutrons emitted?(a) Inverse beta Decay(b) Nuclear fission(c) Spontaneous Fission(d) Nuclear fusionI got this question in examination.The query is from Nuclear Fission & Nuclear Fusion in portion Nuclear Power Plant of Energy Engineering

Answer»

Correct choice is (b) NUCLEAR fission

For EXPLANATION I WOULD say: Nuclear fission is the PROCESS in which a heavy nucleus is split into two or more lighter nuclei. This result in decrease in mass and consequent EXOTHERMIC energy and emission of neutrons take place. Two to three neutrons are emitted per nucleuses which are known as fission elements.

40.

What is acronym of LMFBR?(a) Liquid molecular fast boiling reactor(b) Liquid metal fast breeder reactor(c) Liquefied metal fast boiling reactor(d) Liquid metal fast boiling reactorThe question was posed to me in an interview.Origin of the question is Types of Nuclear Reactor & Nuclear Waste in section Nuclear Power Plant of Energy Engineering

Answer»

Right option is (b) Liquid metal FAST BREEDER reactor

The best EXPLANATION: LMFBR stands for Liquid metal fast breeder reactor. The fuel CONSISTS of 80% by weight of UO2 by weight of PuO2 in small diameter stainless steel clad tubes operating at TEMPERATURE of 670^oC – 700^oC.

41.

In which reactor is the coolant in direct contact with the heat producing nuclear fuel?(a) Fast breeder reactor(b) Pressurized water reactor(c) Boiling water reactor(d) Heavy water reactorThis question was posed to me in final exam.My doubt is from Types of Nuclear Reactor & Nuclear Waste in chapter Nuclear Power Plant of Energy Engineering

Answer»

Right answer is (c) Boiling water reactor

To ELABORATE: In boiling water reactor, the coolant is in direct contact with the heat PRODUCING NUCLEAR fuel and boils in the same compartment in which the fuel is located. The reactor pressure is maintained at 70bar. The coolant THUS SERVES the triple function of coolant, moderato and working fluid.

42.

Which nuclear fuel is usually used in thermal nuclear reactor to create fission?(a) U^234(b) U^235(c) U^236(d) U^237The question was posed to me in an interview.My query is from Nuclear Reactor Components topic in portion Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (b) U^235

The best I can explain: In a thermal nuclear REACTOR the fission induced by neutrons USING a fuel isotope U^235 is one of the SEVERAL isotopes USED in nuclear power generation. Fuel isotopes which are capable of being fissioned by thermal neutrons are called fissile’s.

43.

Control rods are made of __________(a) Cesium(b) Cadmium(c) Tin(d) GalliumThis question was posed to me during an interview.The question is from Nuclear Reactor Components in portion Nuclear Power Plant of Energy Engineering

Answer»

The correct ANSWER is (b) Cadmium

To explain: CONTROL RODS are made of cadmium or boron or Hafnium. They have HUGE neutron absorption cross sections. The control rods are lowered or raised in the reactor core.Control rods are used in control rod assemblies and inserted into the guide fuels WITHIN a fuel element.

44.

Using Helium gas in GCFBR has many advantages.(a) True(b) FalseI have been asked this question by my college director while I was bunking the class.I need to ask this question from Types of Nuclear Reactor & Nuclear Waste topic in chapter Nuclear Power Plant of Energy Engineering

Answer»

Right ANSWER is (a) True

The best explanation: Using HELIUM as coolant posses less severe metallurgical and safety problems. Heat transfer coefficient of helium is much superior than sodium with artificial roughening of fuel rod surfaces. Low DOUBLING time as compared to sodium COOLED REACTORS.

45.

What does the top of the pressurizer in pressurized water reactor consists of at primary system pressure?(a) Steam(b) Air(c) Water(d) FluidsThe question was posed to me in an internship interview.The above asked question is from Types of Nuclear Reactor & Nuclear Waste topic in division Nuclear Power Plant of Energy Engineering

Answer»

Correct choice is (a) Steam

The best I can explain: The pressurizer is a pressure vessel with a heater at the BOTTOM and water SPRAY at the top. The top of the pressurizer is filled with steam at primary system pressure. If the primary loop pressure DROPS, the heater is ENERGIZED to INCREASE the steam content in the pressurizer and thus increases the pressure of primary cooling system.

46.

Select the incorrect statement which supports PWR.(a) Water is used as coolant(b) PWR is stable in operation(c) Uses natural fuel(d) PWR has positive power demand coefficientI have been asked this question in an online quiz.I'd like to ask this question from Types of Nuclear Reactor & Nuclear Waste topic in section Nuclear Power Plant of Energy Engineering

Answer»

The correct answer is (c) Uses natural fuel

Explanation: PWR uses enriched fuel making the reactor more COMPACT in SIZE. And due to high NEGATIVE temperature coefficient, a PWR is stable. Water is used as the coolant. It does have positive power demand coefficient and RESPONDS greatly to more power demand.

47.

What is the time during which one half of a number of radioactive species decays or one half of their activity ceases?(a) Half Life(b) Super critical state(c) Semi life(d) Critical lifeI got this question in an online interview.This interesting question is from Atomic Structure topic in section Nuclear Power Plant of Energy Engineering

Answer»

Correct OPTION is (a) Half LIFE

Easiest explanation: Half life is the time during which one half of a number of radioactive species decays or one half of their ACTIVITY ceases. It is also USED to characterize any type of EXPONENTIAL and Non-exponential decay.

48.

Number of protons in the nucleus is called ___________(a) Atomic number(b) Mass number(c) Electric charge(d) Periodic numberThis question was posed to me by my college director while I was bunking the class.My query is from Atomic Structure in chapter Nuclear Power Plant of Energy Engineering

Answer»

Right OPTION is (a) Atomic NUMBER

For explanation: Number of protons in the nucleus is called atomic number Z. it is unique for each chemical element, and represents both the number of positive CHARGES on the central MASSIVE nucleus of the atom and the number of ELECTRONS in orbits around the nucleus.

49.

Shield is made of _________(a) Iron Metal enclosure(b) Concrete and water(c) Ceramics walls(d) Copper metalI have been asked this question in an online quiz.The above asked question is from Nuclear Reactor Components in section Nuclear Power Plant of Energy Engineering

Answer»

The correct choice is (b) Concrete and water

Explanation: Shield is FREQUENTLY constructed in LAYERS or heavy and light material LIKE concrete and water. Shields for external CIRCUIT where only gamma radiation may be present is made up of steel, lead, POLYETHYLENE, concrete.

50.

What happens when a neutron is absorbed by a nucleus of an atom of U^235?(a) Mass number of atom increases(b) One electron is let out(c) U^236 isotope is formed(d) Nucleus becomes unstableThis question was posed to me by my school principal while I was bunking the class.I need to ask this question from Nuclear Fission & Nuclear Fusion topic in section Nuclear Power Plant of Energy Engineering

Answer»

Right choice is (c) U^236 isotope is FORMED

For explanation I would say: When a neutron is absorbed by a NUCLEUS of an atom U^235, a U^236 isotope is formed. This isotope is highly unstable which LASTS for one millionth of a second and splits into two EQUAL parts RELEASING energy of 200MeV.