Power Plant Engineering 1000+ MCQ with answer for LIC AAO

1. The control rods in the control system of nuclear reactors are used to
A. Absorb excess neutrons
B. Control fuel consumption
C. Control temperature
D. All of these
Answer : A

2. A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be
A. Stable under nuclear radiation
B. Corrosion resistant
C. Good thermal conductor
D. All of these
Answer : D

3. Half life of a radioactive isotope corresponds to the time required for half of the following to decay
A. Electrons
B. Protons
C. Neutrons
D. Atom
Answer : D

4. The nuclear radiators produced in a reactor which must be shielded are
A. Electrons
B. ?, ? and ? rays
C. Neutron and gamma rays
D. None of these
Answer : C

5. In a thermal power plant, coal from the coal handling plant is moved to the boiler bunker through a
A. Belt conveyor
B. Bucket conveyor
C. Fork lift truck
D. Overhead crane
Answer : A

6. A reactor capable of converting a ferrite material into fissile isotopes is called
A. Regenerative reactor
B. Fast breeder reactor
C. Breeder reactor
D. Boiling water reactor
Answer : A

7. The efficiency of a nuclear power plant in comparison to a conventional thermal power plant is
A. Same
B. More
C. Less
D. May be less or mote depending on size
Answer : C

8. Which of the following is more appropriate for a moderator? One which
A. Does not absorb neutrons
B. Absorbs neutrons
C. Accelerates neutrons
D. Eats up neutrons
Answer : A

9. In a fission process, maximum percentage of energy is released as
A. Kinetic energy of neutrons
B. Kinetic energy of fission products
C. Instantaneous release of gamma rays
D. Gradual radioactive decay of fission products
Answer : B

10. A moderator generally used in nuclear power plants is
A. Graphite
B. Heavy water
C. Concrete
D. Graphite and concrete
Answer : D

11. Reactors designed for propulsion applications are designed for
A. Natural uranium
B. Enriched uranium
C. Pure uranium
D. Any type of uranium
Answer : B

12. Plutonium (Pu???) is produced
A. Artificially
B. By fission of Th???
C. When U??? is irradiated by neutrons
D. As basic raw material
Answer : C

13. A fast breeder reactor
A. Uses graphite rods as moderator
B. Has powerful moderator
C. Has no moderator
D. Uses ferrite material as moderator
Answer : C

14. The energy released during the fission of one atom of Uranium 235 in million electron volts is about
A. 100
B. 200
C. 300
D. 400
Answer : B

15. Which of the following nuclear reactor does not need a heat exchanger for generation of steam?
A. Gas cooled
B. Liquid metal cooled
C. Pressurised water
D. Boiling water
Answer : D

16. Gas cooled reactor uses following materials as moderator, and coolant
A. Graphite, CO₂
B. Graphite, air
C. Heavy water, CO₂
D. Lead, H₂
Answer : A

17. Each fission of U??? produces on the average _________ fast neutrons as a product of reaction.
A. 2.46
B. 24.6
C. 246
D. 2460
Answer : A

18. U??? is produced
A. Artificially
B. As basic raw material
C. When thorium is irradiated by neutrons
D. By fission of U???
Answer : C

19. Which of the following is the primary fuel?
A. U???
B. U
C. U???
D. Pu
Answer : B

20. Moderator in nuclear plants is used to
A. Reduce temperature
B. Extract heat from nuclear reaction
C. Control the reaction
D. Cause collision with the fast moving neutrons to reduce their speed
Answer : D

21. A pressurised water reactor employs pressurises for the following application
A. To maintain constant pressure in primary circuit under varying load
B. To Supply high pressure steam
C. To increase pressure of water in primary circuit
D. To provide sub cooled water at high pressure
Answer : A

22. The energy required to be applied to a radioactive nucleus for the emission of a neutron is
A. 1 MeV
B. 2.4 MeV
C. 4.3 MeV
D. 7.8 MeV
Answer : D

23. Pressurised water reactor is designed
A. For boiling pi water in the core
B. To use liquid sodium metal as coolant
C. To use intermediate coolant
D. To prevent the water coolant from boiling in the core
Answer : D

24. Reactors for propulsion applications are designed for
A. Any form of uranium
B. Natural uranium
C. Enriched uranium
D. Plutonium
Answer : C

25. In nuclear fission each neutron that causes fission releases
A. No new neutron
B. At least one new neutron
C. One new neutron
D. More than one new neutron
Answer : D

26. Each fission of U??? produces following number of fast neutrons per fission
A. 1 neutron
B. 3 neutrons
C. 1, 2 neutrons
D. 2 neutrons
Answer : D

27. The coolant used in boiling water reactor is
A. CO2
B. Pressurised water
C. Mixture of water and steam
D. Liquid metal
Answer : C

28. Amongst the following, the fissionable materials are
A. U??? and Pu???
B. U??? and Pu???
C. U??? and Pu???
D. U??? and Pu???
Answer : A

29. Pick up the wrong statement fast breeder reactors
A. Operate at extremely high power densities.
B. Are liquid metal cooled
C. Produce more fuel than they consume
D. Use water as coolant
Answer : D

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

31. The material most commonly used for shielding is
A. Carbon
B. Lead
C. Concrete
D. All of these
Answer : C

32. A boiling water reactor uses following as fuel
A. Enriched uranium
B. Plutonium
C. Thorium
D. U
Answer : A

33. The size of the reactor is said to be critical when
A. Chain reaction can be initiated
B. It becomes uncontrollable
C. It explodes
D. It produces no power
Answer : A

34. A fission chain reaction in uranium can be developed
A. By increasing the contents of U???
B. By slowing down fast neutrons so that U??? fission continues by slow neutron
C. Both (A) and (B)
D. None of these
Answer : C

35. Breeder reactors employ liquid metal coolant because it
A. Acts as good moderator
B. Produces maximum steam
C. Transfers heat from core at a fast rate
D. Breeds neutrons
Answer : C

36. The secondary fuel used in nuclear power plants is
A. U??? and Pu???
B. U??? and Th???
C. U??? and Pu???
D. U??? and Pu???
Answer : A

37. A moderator
A. Absorbs neutrons
B. Does not absorb neutrons
C. Accelerates neutrons
D. None of these
Answer : B

38. Hydrogen is preferred as better coolant in comparison to CO? because former
A. Is lighter
B. Is inert
C. Has high specific heat
D. Is a good conductor
Answer : C

39. Which of the following statement is correct regarding the features of a Breeder reactor?
A. It produces more fuel than it consumes.
B. It requires highly enriched fuel.
C. It requires liquid sodium metal as moderator.
D. All of the above
Answer : D

40. Reactors for propulsion applications use
A. Natural uranium
B. Molten lead
C. Any form of uranium
D. Thorium
Answer : B

41. The process by which a heavy nucleus is spitted into two light nuclei is known as
A. Splitting
B. Fission
C. Fusion
D. Disintegration
Answer : B

42. Electron volt is the unit of
A. Atomic power
B. Energy
C. Voltage
D. Radio activity
Answer : B

43. Ferrite material is
A. The most fissionable material
B. The basic fuel for nuclear paints
C. Basic raw material for nuclear plants
D. The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
Answer : D

44. Ideally the neutron flux in reactor should be
A. Maximum in centre and zero at side
B. Maximum at side and zero in canter
C. Uniform throughout
D. Zero throughout
Answer : C

45. Plutonium is produced
A. As basic raw material
B. By neutron irradiation of Uz
C. By neutron irradiation of thorium
D. Artificially
Answer : B

46. The total energy released in fission of U is
A. 5 MeV
B. 10 MeV
C. 199 MeV
D. 168 MeV
Answer : C

47. U238 will undergo fission by
A. High energy (fast) neutrons alone
B. Low energy (slow) neutrons alone
C. Either fast or slow neutrons
D. Medium energy neutrons
Answer : A

48. Boiling water reactor uses the following as moderator, coolant and working fluid
A. Ordinary fluid
B. Heavy water
C. Molten lead
D. Hydrogen gas
Answer : A

49. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is
A. Same
B. Lower
C. Higher
D. Unity
Answer : B

50. The commonly used material for shielding is
A. Lead or concrete
B. Lead and tin
C. Graphite or cadmium
D. Thick galvanised sheets
Answer : A