Objective type questions on power plant engineering - Set 06 - ObjectiveBooks

# Practice Test: Question Set - 06

1. Breeder reactor has a conversion ratio of
(A) Unity
(B) More than unity
(C) Less than unity
(D) Zero

2. In triggering fission, the following types of neutrons are desirable
(A) Fast moving
(B) Slow moving
(C) Critical neutrons
(D) Neutrons at rest

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

4. 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

5. A fast breeder reactor
(A) Uses graphite rods as moderator
(B) Has powerful moderator
(C) Has no moderator
(D) Uses ferrite material as moderator

6. 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

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

8. Natural uranium is made up of
(A) 99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
(B) 99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
(C) 99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
(D) 99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈

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

10. A fast breeder reactor uses
(A) 90% U₂₃₅
(B) U₂₃₈
(C) U₂₃₅
(D) Pu₂₃₉

11. Amongst the following, the fissionable materials are
(A) U₂₃₃ and Pu₂₂₉
(B) U₂₃₁ and Pu₂₃₃
(C) U₂₃₅ and Pu₂₃₅
(D) U₂₃₈ and Pu₂₃₉

12. The total energy released in fission of U is
(A) 5 MeV
(B) 10 MeV
(C) 199 MeV
(D) 168 MeV

13. Fast breeder reactor uses
(A) Boiler
(B) Direct cycle of coolant system
(C) Double circuit system of coolant cycle
(D) Multi passes system

14. Which of the following is the heaviest?
(A) Neutron
(B) Proton
(C) Atom
(D) Electron

15. A nuclear fission produces energy of following order in MeV
(A) 20
(B) 200
(C) 2000
(D) 20,000

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