Thermal and Nuclear Power Engineering Questions Answers - Set 06 - ObjectiveBooks

Thermal and Nuclear Power Engineering Questions Answers - Set 06

Practice Test: Question Set - 06

1. 'Light water' used as a coolant in nuclear reactor is nothing but
    (A) Ordinary water
    (B) Mildly acidic (pH = 6) water
    (C) Mildly alkaline (pH = 8) water
    (D) None of these

2. Which of the following undergoes fission reaction easily?
    (A) U-235
    (B) U-238
    (C) Th-232
    (D) None of these

3. A radioactive isotope undergoes decay with respect to time following __________ law.
    (A) Logarithmic
    (B) Exponential
    (C) Linear
    (D) Inverse square

4. The function of moderators in nuclear reactor is to
    (A) Slow down the secondary neutrons
    (B) Absorb the secondary neutrons
    (C) Control the chain reaction
    (D) None of these

5. The decay product of tritium (a beta emitter) is
    (A) Lithium
    (B) Helium
    (C) Deuterium
    (D) Hydrogen

6. The molecular weight of heavy water is
    (A) 10
    (B) 18
    (C) 20
    (D) 36

7. Enriched uranium means that, it contains
    (A) More than 0.71% of U-235
    (B) Only fertile material
    (C) Only fissile material
    (D) No impurities

8. In the nuclear reaction, 93N239→ 94Pu239 + ?; the missing particle is a/an
    (A) Electron
    (B) Proton
    (C) Neutron
    (D) Positron

9. Which is a fertile nuclear fuel?
    (A) U-233
    (B) U-235
    (C) Pu-239
    (D) Th-232

10. Spent fuel from the nuclear thermal reactor contains
    (A) Fission products
    (B) Plutonium
    (C) Unused fuel
    (D) All (a), (b) & (c)

11. Heavy water is used as a moderator in a
    (A) Pressurized water reactor (PWR)
    (B) Boiling water reactor (BWR)
    (C) Candu reactor
    (D) Molten sodium cooled reactor

12. Heavy water has maximum density at __________ °C.
    (A) 4
    (B) 11.6
    (C) 0
    (D) 18.6

13. Candu reactor is a __________ nuclear reactor.
    (A) Natural uranium fuelled heavy water cooled & moderated
    (B) Highly enriched uranium (85% U-235) fuelled
    (C) Homogeneous
    (D) Fast breeder

14. The most commonly used nuclear fuel in boiling water reactor is
    (A) Enriched uranium
    (B) Natural uranium
    (C) Plutonium
    (D) Monazite sand

15. Which one is the radioactive isotope of hydrogen?
    (A) Deuterium
    (B) Ortho-hydrogen
    (C) Tritium
    (D) None of these

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