1000+ Power Plant Engineering MCQ for NDA [Solved]

1. 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

2. The primary fuel used in nuclear power plants is
A. U???
B. U???
C. Pu???
D. Pu???
Answer : A

3. The function of control rods in nuclear plants is to
A. Control temperature
B. Control radioactive pollution
C. Control absorption of neutron
D. Control fuel consumption
Answer : C

4. 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

5. Natural uranium is made up of
A. 99.282% U???, 0.712% U???, 0.006% U???
B. 99.282% U???, 0.712% U???, 0.06%' U???
C. 99.282% U???, 0.712% U???, 0.006% U???
D. 99.282% U???, 0.712% U???, 0.006% U???
Answer : A

6. The main interest of shielding in nuclear reactor is protection against
A. X-rays
B. Infrared rays
C. Neutrons and gamma rays
D. Electrons
Answer : D

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

8. Uranium has isotopes
A. U???
B. U???
C. U???
D. All of these
Answer : D

9. 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

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

11. 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

12. 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

13. Nuclear reactors are used
A. To produce heat for thermoelectric power
B. To produce fissionable material
C. To propel ships, submarines, aircrafts
D. All of these
Answer : D

14. For economical operation of a nuclear plant
A. Used fuel should be reprocessed
B. Moderator should be used
C. Coolant should be employed
D. Control rods should be used
Answer : A

15. 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

16. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
A. Heavy water
B. Graphite
C. Carbon dioxide
D. No moderator is needed
Answer : D

17. The predominant isotope of the naturally occuring element is
A. U???
B. U???
C. Pu???
D. Pu???
Answer : B

18. The presence of reflector in nuclear power plants results in
A. Increased production of neutrons
B. Complete absorption of neutrons
C. Controlled production of neutrons
D. Decreased leakage of neutrons
Answer : D

19. 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

20. The most commonly used moderator in nuclear plants is
A. Heavy water
B. Concrete and bricks
C. Graphite and concrete
D. Graphite
Answer : D

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

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

23. 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

24. The nuclear energy is measured as
A. MeV
B. Curie
C. Farads
D. MW
Answer : A

25. U235 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 : C

26. The mass number of a substance represents the sum of total number of
A. Protons and neutrons in an atom
B. Protons and electrons in an atom
C. Neutrons and electrons in an atom
D. Protons and neutrons in a nucleus
Answer : D

27. The unit of radioactivity is
A. Electron volt
B. Electron ampere
C. Curie
D. MV
Answer : C

28. 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

29. 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

30. A fast breeder reactor uses
A. 90% U???
B. U???
C. U???
D. Pu???
Answer : A

31. Artificial radioactive isotopes find application in
A. Power generation
B. Nucleonic devices
C. Nuclear fission
D. Medical field
Answer : D

32. 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

33. 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

34. Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
A. High neutron absorption cross-section
B. Low moderating efficiency
C. High neutron scatter cross-section
D. Low neutron absorption cross-section
Answer : B

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

36. Fast breeder reactor uses
A. Boiler
B. Direct cycle of coolant system
C. Double circuit system of coolant cycle
D. Multi passes system
Answer : C

37. 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

38. 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

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

40. The following present serious difficulty in designing reactor shield
A. Alpha particles
B. Beta particles
C. Thermal neutrons
D. Fast neutrons and gamma rays
Answer : D

41. In the breeder reactors the generation of new fissionable atom is
A. At the lower rate than the consumption
B. At a higher rate than the consumption
C. At an equal rate of the consumption
D. Depends on other considerations
Answer : B

42. Which of the following are ferrite materials?
A. U??? and Pu???
B. U
C. U??? and Pu???
D. U??? and Th???
Answer : B

43. 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

44. Atomic number of an element in the periodic table represents the numbers of
A. Protons in the nucleus
B. Electrons in the nucleus
C. Neutrons in the nucleus
D. Electrons in the atom
Answer : A

45. In boiling water reactor, moderator is
A. Coolant itself
B. Ferrite rod
C. Graphite rod
D. Liquid sodium metal
Answer : A

46. Which of the following is the heaviest?
A. Neutron
B. Proton
C. Atom
D. Electron
Answer : C

47. The energy produced by a thermal reactor of same size as a breeder reactor is
A. Almost same
B. Slightly more
C. Slightly less
D. Much less
Answer : D

48. 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

49. A fission chain reaction in uranium can be developed by
A. Slowing down fast neutrons so that Uz fission continues by slow motion neutrons
B. Accelerating fast neutrons
C. Absorbing all neutrons
D. Using moderator
Answer : A

50. In triggering fission, which types of neutrons are more effective?
A. Fast
B. Slow
C. In bulk
D. Static
Answer : B