Nuclear Power Engineering Quiz Questions & Answers - Set 15 - ObjectiveBooks

Nuclear Power Engineering Quiz Questions & Answers - Set 15

Practice Test: Question Set - 15

1. A radioactive substance does not emit
    (A) α-ray
    (B) Proton
    (C) Positron
    (D) β-ray

2. Which of the following nuclear materials is fissile?
    (A) Uranium-238
    (B) Thorium-232
    (C) Plutonium-239
    (D) None of these

3. Thermal shield is used in high powered nuclear reactors to
    (A) Protect the walls of the reactor from radiation damage
    (B) Absorb the fast neutrons
    (C) Slow down the secondary neutrons
    (D) Protect the fuel element from coming in contact with the coolant

4. Gas cooling as compared to water cooling of nuclear reactors
    (A) Cannot attain a high temperature
    (B) Is more efficient as gas has a higher specific heat
    (C) Can produce only saturated steam for feeding to power turbine
    (D) None of these

5. Pick out the wrong statement.
    (A) The disintegration rate of a radioactive substance cannot be increased by heating it
    (B) Electrons have negligible mass and unit negative change
    (C) Deuterium atom has one proton and two neutrons in its nucleus
    (D) Cadmium is capable of absorbing neutrons

6. Unit of radioactivity is
    (A) Barn
    (B) Fermi
    (C) Angstrom
    (D) Curie

7. Commercial power generation from fusion reactor is not yet possible, because
    (A) It is difficult to control nuclear fusion reaction
    (B) The fuel required (i.e., deuterium & tritium) is scarce
    (C) It is difficult to initiate fusion reaction
    (D) Quantity of fuel required for initiating fusion reaction is prohibitively high

8. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ meters/second.
    (A) 1100
    (B) 2200
    (C) 3300
    (D) 4400

9. Molten sodium (as a coolant in fast breeder reactor)
    (A) Can’t attain high temperature at normal pressure
    (B) Is not at all corrosive, even at a higher temperature
    (C) Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
    (D) None of these

10. Positron is a/an
    (A) Nucleus having two protons
    (B) Helium nucleus
    (C) Electron with positive charge
    (D) Nucleus with one proton and one neutron

11. Out of the following, nucleus of __________ atom contains the largest number of neutrons.
    (A) U-235
    (B) U-238
    (C) U-239
    (D) Pu-239

12. Nuclear power reactor located at Tarapur is of __________ type.
    (A) Fast breeder
    (B) Pressurized water
    (C) Boiling water
    (D) Gas cooled

13. The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.
    (A) 3.125
    (B) 6.25
    (C) 12.50
    (D) 25

14. Quantity of fissionable material (i.e. U-235) in natural uranium is __________ percent.
    (A) 0.71
    (B) 6.31
    (C) 99.29
    (D) 12.73

15. Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays.
    (A) X
    (B) α and β
    (C) Neutrons & gamma
    (D) Infrared

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