Power Plant Engineering 1000+ MCQ with answer for RBI Grade B officer

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

2. 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

3. 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

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

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

6. 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

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

8. In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be
A. Greater than 1.0
B. Less than 1.0
C. Equal to zero
D. Equal to 1.0
Answer : D

9. Solid fuel for nuclear reactions may be fabricated into various small shapes such as
A. Plates
B. Pallets
C. Pins
D. Any one of the above
Answer : D

10. A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
A. Slow down the speed of fast moving neutrons
B. Control the reaction
C. Reduce the temperature
D. Extracts heat from nuclear reaction
Answer : A

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

12. Which is not identical for an atom and an isotope?
A. Mass number
B. Atomic number
C. Chemical properties
D. Position in periodic table
Answer : A

13. 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

14. 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

15. The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is
A. Higher cost of nuclear fuel
B. High initial cost
C. High heat rejection in condenser
D. Lower temperature and pressure conditions
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. A fast breeder reactor uses
A. 90% U???
B. U???
C. U???
D. Pu???
Answer : A

18. 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

19. 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

20. 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

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

22. A power plant giving least running cost of production of electrical power is
A. Steam power plant
B. Gas turbine power plant
C. Hydro electric power plant
D. Nuclear power plant
Answer : D

23. Pick up the wrong statement
A. 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 eV
C. Fast neutrons have energies above 1000 eV
D. Fast reactor uses moderator
Answer : D

24. Enriched uranium is one in which
A. Percentage of U??? has been artificially increased
B. Percentage of U has been artificially increased
C. Percentage of U??? has been artificially increased
D. Extra energy is pumped from outside
Answer : A

25. 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

26. 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

27. 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

28. 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

29. A nuclear unit becoming critical means
A. It is generating power to rated capacity
B. It is capable of generating much more than rated capacity
C. There is danger of nuclear spread
D. Chain reaction that causes automatic splitting of the fuel nuclei has been established
Answer : D

30. 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

31. 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

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

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

34. Reflector in nuclear plants is used to
A. Return the neutrons back into the core
B. Shield the radioactivity completely
C. Check pollution
D. Conserve energy
Answer : A

35. 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

36. The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be
A. More
B. Less
C. Same
D. Zero
Answer : B

37. 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

38. Plutonium (Pu239) is produced
A. Artificially
B. When U238 is irradiated by neutrons
C. By fission of Th232
D. As basic raw material
Answer : B

39. Superheated steam is generated in following reactor
A. Boiling water
B. Gas cooled
C. Pressurised water
D. All of the above
Answer : B

40. 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

41. 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

42. One gram of uranium will produce energy equivalent to approximately
A. 1 tonne of high grade coal
B. 4.5 tonnes of high grade coal
C. 10 tonnes of high grade coal
D. 100 tonnes of high grade coal
Answer : B

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

44. In fast breeder reactors
A. Any type of moderator can be used
B. Graphite is used as the moderator
C. Heavy water is used as the moderator
D. Moderator is dispensed with.
Answer : D

45. Isotopes of same elements have
A. Same atomic number and different masses
B. Same chemical properties but different atomic numbers
C. Different masses and different atomic numbers
D. Different chemical properties and same atomic numbers
Answer : B

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

47. 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

48. 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

49. 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

50. 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