Download pdf - Nuclear Power Plants - Test

8/13/2019 Nuclear Power Plants - Test

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Nuclear Power Plants

1. The efficiency of a nuclear power plant in comparison to a conventional thermal power plant is ___.A. sameB. moreC. lessD. may be less or mote depending on size

2. Isotopes of same elements have ___.A. same atomic number and different massesB. same chemical properties but different atomic numbersC. different masses and different atomic numbersD. different chemical properties and same atomic numbers

3. Atomic number of an element in the periodic table represents the numbers of ___.A.protons in the nucleusB. electrons in me nucleusC. neutrons in the nucleusD. electrons in the atom

4. The mass number of a substance represents the sum of total number of ___.A. protons and neutrons in an atomB. protons and electrons in an atomC. neutrons and electrons in an atomD.protons and neutrons in a nucleus

5. Which is not identical for an atom and an isotope?A. mass numberB. atomic numberC. chemical propertiesD. position in periodic table

6. Amongst the following, the fissionable materials are ___.A. U233 and Pu239B. U231and Pu233C. U235and Pu235D. U238and Pu239

7. A nuclear unit becoming critical means ___.A. it is generating power to rated capacityB. it is capable of generating much more than rated capacityC. there is danger of nuclear spreadD. chain reaction that causes automatic splitting of the fuel nuclei has been established

8. Moderator in nuclear plants is used to ___.A. reduce temperatureB. extract heat from nuclear reactionC. control the reactionD. cause collision with the fast moving neutrons to reduce their speed

9. The most commonly used moderator in nuclear plants is ___.A. heavy waterB. concrete and bricksC. graphite and concreteD. graphite.

10.The nuclear energy is measured as ___.


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D. neutrons and gamma rays20.Reflector in nuclear plants is used to ___.

A. return the neutrons back into the coreB. shield the radioactivity completelyC. check pollutionD. conserve energy

21.The energy required to be applied to a radioactive nucleus for the emission of a neutron is ___.A. 1 MeVB. 2.4 MeVC. 4.3 MeVD. 7.8 MeV

22.Ferrite material is ___.A. the most fissionable materialB. the basic fuel for nuclear paintsC. basic raw material for nuclear plantsD. the material which absorbs neutrons and undergoes spontaneous changes leading to the

formation of fissionable material

23.Enriched uranium is one in which ___.A. %age of U235has been artificially increasedB. %age of U has been artificially increasedC. %age of U234has been artificially increasedD. extra energy is pumped from outside

24.Which of the following particles is the lightest?A. nucleusB. electronC. protonD. meson

25.Which of the following is the heaviest?A.

neutron

B. protonC. atomD. electron

26. In fast breeder reactors ___.A. any type of moderator can be usedB. graphite is used as the moderatorC. heavy water is used as the moderatorD. moderator is dispensed with

27. In nuclear fission each neutron that causes fission releasesA. no new neutronB. at least one new neutronC. one new neutronD. more than one new neutrons

28.The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor isA. sameB. lowerC. higherD. unity29.Gas cooled reactor uses following materials as moderator, and coolant __.


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A. graphite, CO2B. graphite, airC. heavy water, CO2D. lead, H2

30.A nuclear fission produces energy of following order in MeVA. 20B. 200C. 2000D. 20,000

31.The process by which a heavy nucleus is splitted into two light nuclei is known as ___.A. splittingB. fissionC. fusionD. disintegration

32.A nuclear fission is initiated when the critical energy as compared to neutron binding energy of theatoms is ___.

A. sameB. moreC. lessD. there is no such criterion

33.The fast breeder reactor uses the following moderatorA. demineralised waterB. carbon dioxideC. heavy waterD. no moderator is used.

34.Boiling water reactor uses the following as moderator, coolant and working fluidA. ordinary fluidB. heavy waterC.

molten lead

D. hydrogen gas35. Ideally the neutron flux in reactor should be ___.

A. maximum in centre and zero at sideB. maximum at side and zero in centreC. uniform throughoutD. zero throughout

36.Enriched uranium may contain fissionable contents of the order of ___.A. 1-99%B. 1-25%C. 1-50%D. 1-75%

37.U235will undergo fission by ___.A. high energy (fast) neutrons aloneB. low energy (slow) neutrons aloneC. either fast or slow neutronsD. medium energy neutrons

38.U238will undergo fission by___.A. high energy (fast) neutrons aloneB. low energy (slow) neutrons alone


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C. either fast or slow neutronsD. medium energy neutrons

39.A reactor capable of converting a ferrite material into fissile isotopes is called ___.A. regenerative reactorB. fast breeder reactorC. breeder reactorD. boiling water reactor

40.Hydrogen is preferred as better coolant in comparison to CO2because former ___.A. is lighterB. is inertC. has high specific heatD. is a good conductor

41.Natural uranium is made up of ___.A. 99.282% U238, 0.712% U235, 0.006% U234B. 99.282% U235, 0.712% U238, 0.06%' U234C. 99.282% U234, 0.712% U238, 0.006% U235D. 99.282% U235, 0.712% U234, 0.006% U238

42.The risk of radioactive hazard is greatest in the turbine with following reactorA. pressurized waterB. boiling waterC. gas cooledD. liquid metal cooled

43.Plutonium is produced ___.A. as basic raw materialB. by neutron irradiation of UC. by neutron irradiation of thoriumD. artificially

44.Electron-volt is the unit of ___.A.

atomic power

B. energyC. voltageD. radio activity

45.Pick up the wrong statementA. In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.B. Slow or thermal neutrons have energy of the order or 0.025 EvC. Fast neutrons have energies above 1000 eVD. Fast reactor uses moderator

46.The unit of radio-activity is ___.A. electron-voltB. electron-ampereC. curieD. MeV

47.Pick up the wrong statement Fast breeder reactorsA. operate at extremely high power densities.B. are liquid-metal cooledC. produce more fuel than they consumeD. use water as coolant.

48.Uranium-233 is produced ___.


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C. in bulkD. static

58.For economical operation of a nuclear plant ___.A. used fuel should be reprocessedB. moderator should be usedC. coolant should be employedD. control rods should be used

59.The size of the reactor is said to be critical when ___.A. chain reaction can be initiatedB. it becomes uncontrollableC. it explodesD. it produces no power

60.When a reactor becomes critical, then the production of neutrons is ___.A. infiniteB. zeroC. exactly balanced by the loss of neutrons through leakageD. initiated

61. In the breeder reactors the generation of new fissionable atom is ___.A. at the lower rate than the consumptionB. at a higher rate than the consumptionC. at an equal rate of the consumptionD. depends on other considerations

62.The energy produced by a thermal reactor of same size as a breeder reactor is ___.A. almost sameB. slightly moreC. slightly lessD. much less

63.Reactors designed for propulsion applications are designed for ___.A.

natural uranium

B. enriched uraniumC. pure uraniumD. any type of uranium

64.Superheated steam is generated in following reactorA. boiling waterB. gas cooledC. pressurized waterD. all of the above

65.Solid- fuel for nuclear reactions may be fabricated into various small shapes such as ___.A. platesB. palletsC. pinsD. any one of the above

66.Which of the following is more appropriate for a moderator. One which ___.A. does not absorb neutronsB. absorbs neutronsC. accelerates neutronsD. eats up neutrons

67.A fission chain reaction in uranium can be developed by ___.


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A. slowing down fast neutrons so that U fission continues by slow motion neutronsB. accelerating fast neutronsC. absorbing all neutronsD. using moderator

68. In triggering fission, the following types of neutrons are desirableA. fast movingB. slow movingC. critical neutronsD. neutrons at rest

69.Effective moderators are those materials which contain ___.A. light weight atomsB. heavy weight atomsC. critical atomsD. zero weight atoms

70. In a fission process, maximum %age of energy is released as ___.A. kinetic energy of neutronsB. kinetic energy of fission productsC. instantaneous release of gamma raysD. gradual radioactive decay of fission products

71.The following present serious difficulty in designing reactor shieldA. alpha particlesB. beta particlesC. thermal neutronsD.fast neutrons and gamma rays

72. In nuclear fission ___.A. the original elements change into completely different elementsB. the electrons of the element changeC. the molecules rearrange themselves to form other moleculesD.

none of the above

73. In order to have constant claim reaction to produce a constant rate of heat output, the value of ratioof the number of neutrons in one generation to the number of neutrons in the immediately

preceding generation must be ___.

A. greater than 1.0B. less than 1.0C. equal to zeroD. equal to 1.0

74.Each fission of U235produces following number of fast neutrons per fissionA. 1 neutronB. 1 neutronsC. 1/2 neutronsD. 2 neutrons

75.A fast breeder reactor uses following as fuelA. enriched uraniumB. plutoniumC. thoriumD. U235

76.A boiling water reactor uses following as fuelA. enriched uranium


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B. plutoniumC. thoriumD. U

77.A fast breeder reactor ___.A. uses graphite rods as moderatorB. has powerful moderatorC. has no moderatorD. uses ferrite material as moderator

78.Artificial radioactive isotopes find application in ___.A. power generationB. nucleonic devicesC. nuclear fissionD. medical field.

79.A fast breeder reactor uses ___.A. 90% U-235B. U-238C. U-235D. Pu-239

80.Half life of a radioactive isotope corresponds to the time required for half of the following to decayA. electronsB. protonsC. neutronsD. atom

81.Pressurized water reactor is designed ___.A. for boiling pi water in the coreB. to use liquid sodium metal as coolantC. to use intermediate coolantD. to prevent the water coolant from boiling in the core

82.The coolant used in boiling water reactor is ___.A. CO2B. pressurized waterC. mixture of water and steamD. liquid metal

83. In boiling water reactor, moderator is ___.A. coolant itselfB. ferrite rodC. graphite rodD. liquid sodium metal

84.The most practical fuel for a thermonuclear reactor, both from economical and nuclearconsideration is ___.

A. plutoniumB. uraniumC. deuteriumD. thorium

85.The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is___.

A. higher cost of nuclear fuelB. high initial cost


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C. high heat rejection in condenserD. lower temperature and pressure conditions

86.The presence of reflector in nuclear power plants results in ___.A. increased production of neutronsB. complete absorption of neutronsC. controlled production of neutronsD. decreased leakage of neutrons

87.The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons tosustain a chain reaction, would be ___.

A. moreB. lessC. sameD. zero

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