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Fresh Nuclear Engineering Interview Questions & Answers:

1. Neutrons have mass approximately equal to that of __________ atoms.

A. hydrogen
B. helium
C. deuterium
D. none of these

Option A

2. Pick out the wrong statement.

A. The ratio of the density of the 'nucleus' to that of the 'atom' is 1012 .
B. α-particle is identical with a doubly charged helium ion.
C. The mass of deuterium atom is half that of helium atom.
D. Gamma rays are high energy electrons.

Option D

3. The disintegration rate of a radioactive element

A. progressively increases.
B. progressively decreases.
C. remains constant throughout.
D. may increase or decrease depending on the material.

Option B

4. Heavy water used in the nuclear reactors to slow down the speed of neutrons is

A. highly purified water.
B. a compound of oxygen and deuterium.
C. water having dissolved salts of heavy metals.
D. none of these.

Option B

5. Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm2 .

A. 0.2
B. 7
C. 35
D. 50

Option B

6. The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the

A. fuel cost per unit power generated is less.
B. thermal efficiency of the former is higher.
C. maintenance cost of the former is less.
D. none of these.

Option A

7. Pick out the wrong statement.

A. Atoms with same number of nucleons but different number of protons are called isobars.
B. Atoms with same number of protons but different number of nucleons are called isoters.
C. Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays.
D. The product formed by emission of α-particle has mass number less by 4 units than the parent nuclide.

Option B

8. Molten sodium is used as a coolant in a fast breeder reactor, because of its

A. excellent moderating properties.
B. neutron breeding capability.
C. faster heat removal capability from the core.
D. capability to increase the reaction rate in the core.

Option C

9. Which of the following is the most harmful for the human being?

A. β-rays
B. X-rays
C. γ-rays
D. ultra violet rays

Option C

10. Coolant used in a fast breeder reactor is

A. molten sodium
B. heavy water
C. ordinary water
D. helium

Option A

11. An element having large number of __________ is most easily subjected to nuclear fission.

A. protons
B. electrons
C. neutrons
D. nucleons

Option D

12. Heavy water is preferred over ordinary water as a coolant, because it.

A. acts both as an efficient coolant as well as a moderator.
B. can be heated to a higher temperature without pressurizing.
C. is less prone to radiation damage.
D. all (a), (b) and (c).

Option D

13. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

A. 159
B. 1837
C. 2537
D. 10000

Option B

14. The number of neutrons in the nucleus of Uranium-233 (92U233) is

A. 141
B. 92
C. 233
D. 325

Option A

15. Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?

A. N2
B. He
C. CO2
D. H2

Option A

16. Nuclear power reactor located at Tarapur is of __________ type.

A. fast breeder
B. pressurised water
C. boiling water
D. gas cooled

Option C

17. Which of the following is not an ore of uranium?

A. Pitchblende
B. Kyanite
C. Carnotite
D. Rescolite

Option B

18. The main purpose of control rod in a nuclear reactor is to control the

A. chain reaction and hence the power output by regulating the number of secondary neutrons causing fission.
B. emission of hazardous radiation.
C. conversion of fissile material into fertile material.
D. velocity of the secondary neutrons.

Option A

19. Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

A. achieving high degree of superheat in the steam.
B. faster heat removal rate from the core.
C. lowering the coolant circulation pressure.
D. avoiding the mixing of water with radioactive sodium, as it may cause explosion.

Option D

20. What is the average life of a radioactive atom having a 'half life period' of T?

A. 1.44 T
B. 0.144 T
C. 14.4 T
D. 2T

Option A

21. Use of molten metal as a coolant in fast breeder reactor helps in

A. rapid heat transfer from the core.
B. accelerating the reaction rate in the core.
C. breeding neutrons.
D. accelerating the neutrons.

Option A

22. Which of the following is a non-fissile material?

A. Plutonium-239
B. Uranium-235
C. Uranium-233
D. Thorium-232

Option D

23. Candu reactor is a __________ nuclcear reactor.

A. natural uranium fuelled heavy water cooled & moderated
B. highly enriched uranium (85% U-235) fuelled
C. homogeneous
D. fast breeder

Option A

24. Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is

A. 0.1
B. 1
C. 3
D. 12

Option A

25. Nucleus of tritium has __________ neutrons.

A. 1
B. 2
C. 3
D. 5

Option B

26. Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has

A. five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva).
B. a 420 MW nuclear power plant.
C. a very large capacity (100 tons/yr) heavy water plant.
D. all (a), (b) and (c).

Option A

27. U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent.

A. 85
B. 50
C. 3
D. 97

Option C

28. A fast breeder reactor

A. utilises fast neutrons for causing fission.
B. converts fertile material (e.g., U-238) into fissile material (Pu-239).
C. normally employs molten sodium as coolant.
D. all (a), (b) and (c).

Option D

29. H2 is a better coolant than CO2, due to its relatively

A. lower density.
B. higher specific heat.
C. non-reactivity to uranium.
D. lower neutron capture cross-section.

Option B

30. The half life period of a radiactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.

A. 1/4
B. 1/8
C. 1/2
D. 1/16

Option D

31. First experimental observation of nuclear fission was done by

A. Plane
B. Rutherford
C. Fermi
D. Hahn and Strassman

Option C

32. Coolant present in the primary circuit of a pressurised water reactor is high pressure

A. sub cooled water
B. saturated water
C. superheated steam
D. saturated steam

Option B

33. Extraction of uranium from its ore is done using __________ methods.

A. electrometallurgical
B. pyrometallurgical
C. chemical
D. physical beneficiation

Option C

34. The emission of an a-particle causes the resultant nucleus to have

A. more atomic weight and less atomic number.
B. less atomic weight and less atomic number.
C. less atomic weight and more atomic number.
D. none of these.

Option A

35. '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.

Option A

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