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chemical engineering nuclear power engineering MCQs

Practise multiple-choice questions from chemical engineering nuclear power engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering nuclear power engineering Mcqs
1. Thorium-232 (a fertile material) on absorption of a neutron gets converted into ___________ , which is a fissile material?
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A. Thorium-233

B. Plutonium-239

C. Uranium-235

D. Uranium-233
2. Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is_______________?
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A. 92

B. 235

C. 3

D. 200

3. A heterogeneous reactor is the one, in which the moderator and the________________?
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A. Coolant are present in different phases (e.g., heavy water and graphite)

B. None of these

C. Coolant are different materials

D. Fuel are present in different phases (e.g. uranium and heavy water)
4. Which of the following factors is the most important in the site selection for a nuclear power plant ?
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A. Abundant availability of water

B. Proximity to fuel source

C. Remotely located from residential areas

D. Absence of earthquake prone zone in nearby areas
5. Which of the following may not need a moderator ?
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A. Fast breeder reactor

B. Candu reactor

C. Pressurised water reactor

D. Homogeneous reactor

6. ?-rays emission in radioactive disintegration is always accompanied by the emission of____________________?
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A. None of these

B. Neutrons

C. ?-rays

D. ?-rays
7. Liquid metal (e.g., molten sodium) is preferred as a coolant in case of a/an ______________ reactor?
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A. Fast breeder

B. Enriched uranium (3% U-235) fuelled

C. Graphite moderated

D. Homogeneous

8. The main purpose of control rod in a nuclear reactor is to control the___________________?
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A. Chain reaction and hence the power output by regulating the number of secondary neutrons

B. Emission of hazardous radiation

C. Conversion of fissile material into fertile material

D. Velocity of the secondary neutrons

E. sing fission</strong>

9. Heavy water is preferred over ordinary water as a coolant, because it?
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A. Acts both as an efficient coolant as well as a moderator

B. Can be heated to a higher temperature without pressurizing

C. Is less prone to radiation damage

D. All A., B. and C.
10. Tarapur (INDIA) atomic power station____________________?
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A. Has an installed capacity of 400 MW

B. Is the first power reactor in India, which became critical in 1969

C. All A., B. and C.

D. Has two boiling water reactors of American design

11. Net efficiency of ordinary light water cooled nuclear reactor is about _____________ percent?
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A. 88

B. 32

C. 52

D. 72

12. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of ____________ percent of U-235 (i.e. fissile material)?
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A. 65

B. 15

C. 45

D. 85
13. Final product of uranium extraction plant at Jadugoda (Bihar) is________________?
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A. Magnesium diuranate

B. Uranium oxide

C. Uranium

D. Uranium carbide

14. Radioactive decay of a material involves a _____________ order reaction?
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A. Second

B. Third

C. First

D. Zero

15. Thermal neutrons which are used to cause the fission of U-235 have energy _____________ eV?
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A. > 1

B. 25-Jan

C. > 200

D. < 0.025
16. In nuclear reactions, ______________ number is conserved?
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A. Mass

B. Atomic

C. Both A. & B.

D. Neither A. nor B.

17. Which of the following ores contains maximum percentage of uranium ?
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A. Carnotite

B. Pitchblende

C. Rescolite

D. Thorium

18. Isotopes of an element have the same__________________?
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A. Electronic configuration

B. Mass number

C. Number of neutrons

D. Atomic weight

19. Unit of radioactivity is_________________?
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A. Curie

B. Fermi

C. Angstrom

D. Barn

20. Water is a better coolant than a gas (like CO2, He, N2 etc.), because it_________________?
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A. Require comparatively smaller pumps and heat exchanger for a given heat transfer rate

B. Is a better neutron moderator as well

C. All A., B. and C.

D. Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature

21. An ideal coolant for a nuclear reactor should ________________?
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A. Have high density, but low heat transfer co-efficient

B. Be capable of attaining high temperature, only when it is pressurised

C. Be a good absorber of neutrons

D. Be free from radiation damage and non-corrosive
22. The decrease in the atomic number is not observed in case of________________?
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A. ?-emission

B. Positron emission

C. Electron capture

D. ?-emission
23. The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the________________?
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A. Thermal efficiency of the former is higher

B. Fuel cost per unit power generated is less

C. Maintenance cost of the former is less

D. None of these

24. Out of the following places, a nuclear power plant is not located at______________?
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A. Talcher (Orissa)

B. Kalpakkam (Tamilnadu)

C. Kaiga (Karnataka)

D. Rawatbhata (Rajasthan)

25. Which is used as a coolant in nuclear reactor due to its high capture cross-section ?
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A. H2

B. He

C. N2

D. CO2

26. Thorium can be converted into U-233 in a _____________ reactor?
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A. Liquid metal cooled

B. Swimming pool

C. Thermal

D. Fast breeder
27. Fuel for a nuclear reactor (thermal) is___________________?
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A. None of these

B. Radium

C. Uranium

D. Plutonium

28. The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?
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A. 3

B. 4

C. 2

D. 1

29. A nuclear reactor cant be used for_________________?
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A. Marine ship propulsion

B. None of these

C. Supplying intense fields or beams of neutron for scientific experiments

D. The production of radioisotopes

30. Use of molten metal as a coolant in fast breeder reactor helps in_________________?
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A. Rapid heat transfer from the core

B. Breeding neutrons

C. Accelerating the neutrons

D. Accelerating the reaction rate in the core

31. Plutonium________________?
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A. Is recovered from spent fuel from thermal nuclear reactor

B. Has much lower melting point (640C ) compared to thorium (1690C)

C. Both A. and B.

D. Neither A. nor B.

32. Primary purpose of a ____________ nuclear reactor is to supply a high neutron flux of the order of 1013 to 1014neutrons/cm2 second?
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A. Research

B. Breeder

C. Power

D. Homogeneous

33. Graphite is used in nuclear reactor as_____________________?
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A. Insulation lining of the reactor

B. Retarder of neutron velocity

C. Lubricant

D. Fuel

34. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
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A. 1/8th of it will remain intact at the end of four months

B. It will completely disintegrate in two months

C. It will completely disintegrate in four months

D. 3/4th of it will disintegrate in two months

35. The mass number of an element is not changed, when it emits _______________ radiations?
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A. ?, ?, & ?

B. ? & ?

C. ? & ?

D. ? & ?

36. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of ____________ percent fissile material i.e. U-235?
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A. 7

B. 3

C. 2

D. 1

37. Both tritium and deuterium have the same number of_______________?
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A. Neutrons

B. Electrons

C. Nucleons

D. Protons

38. Spent fuel from the nuclear thermal reactor contains__________________?
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A. All A., B. & C.

B. Fission products

C. Plutonium

D. Unused fuel

39. Candu reactor is a ______________ nuclear reactor?
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A. Fast breeder

B. Homogeneous

C. Natural uranium fuelled heavy water cooled & moderated

D. Highly enriched uranium (85% U-235) fuelled

40. Hydrogen has ______________ isotopes?
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A. Three

B. Two

C. One

D. No

41. Which of the following is a non-fissile material ?
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A. Plutonium-239

B. Uranium-233

C. Uranium-235

D. Thorium-232
42. Which of the following is the most harmful for the human being ?
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A. Ultra violet rays

B. ?-rays

C. X-rays

D. ?-rays

43. The atomic number of a radioactive element is not changed, when it emits _____________ rays?
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A. ? & ?

B. ?

C. ?

D. ?
44. Absorption/scattering cross-section of an element is expressed in barn, which is equivalent to___________________?
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A. 10-12 cm

B. 10-24 cm

C. 10-24 cm2

D. 1 Angstrom

45. Which is not a fissile nuclear material ?
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A. U-233

B. U-235

C. Pu-239

D. U-238
46. Which of the following radiations is the least penetrating ?
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A. ?-rays

B. X-rays

C. ?-rays

D. ?-rays

47. A boiling water reactor is the one, in which the_______________________?
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A. Coolant water, after being heated in the reactor core, generates steam in a boiler

B. Fuel and the coolant are thoroughly mixed to form a homogeneous solution

C. Coolant water is allowed to boil in the core of the reactor

D. Pressurised water is pumped into the core

48. The ratio of atomic radius to its nuclear radius is about___________________?
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A. 108

B. 1012

C. 1015

D. 105
49. Nuclear fuel usually used in a Boiling Water Reactor (BWR) is__________________?
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A. Enriched uranium

B. Plutonium

C. Natural uranium

D. Thorium

50. Molten sodium (as a coolant in fast breeder reactor) ?
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A. tact with air or water</strong>

B. Cant attain high temperature at normal pressure

C. None of these

D. Is highly radioactive at elevated temperatures and can cause explosion, when it comes in

E. Is not at all corrosive, even at a higher temperature