chemical engineering nuclear power engineering MCQs – Page 9

Practise multiple-choice questions from chemical engineering nuclear power engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering nuclear power engineering Mcqs
161. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?
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A. 2200

B. 1100

C. 3300

D. 4400

162. Moderating material used in a thermal-reactor should be a ____________________?
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A. Poor absorber of neutrons

B. Solid substance

C. None of these

D. Good absorber of neutrons

163. The atomic mass of an element is fractional, because ______________________?
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A. Of uncertainty principle

B. It contains neutrons

C. It may have isotopes

D. It may have isobars

164. In the nuclear reaction, 93N239? 94Pu239 + ?; the missing particle is a/an__________________?
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A. Neutron

B. Position

C. Proton

D. Electron
165. Commercial power generation from fusion reactor is not yet possible, because_____________________?
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A. It is difficult to control fusion reaction

B. It is difficult to initiate fusion reaction

C. The fuel required (e.g. deuterium and tritium) is scarce

D. Quantity of fuel required for initiating fusion reaction is prohibitively high

166. The decay product of tritium (a beta emitter) is_________________?
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A. Hydrogen

B. Helium

C. Deuterium

D. Lithium

167. Sodium melts (at atmospheric pressure) at a temperature of ____________ C?
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A. 98

B. 348

C. 58

D. 588

168. Enriched uranium means that, it contains___________________?
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A. Only fissile material

B. No impurities

C. More than 0.71% of U-235

D. Only fertile material

169. The emission of an a-particle causes the resultant nucleus to have____________________?
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A. More atomic weight and less atomic number

B. Less atomic weight and more atomic number

C. Less atomic weight and less atomic number

D. None of these

170. Pressure in a Pressurised Water Reactor (PWR) is used for ____________________?
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A. None of these

B. Superheating the steam

C. Pressurising the water in the primary coolant circuit

D. Maintaining constant pressure in the primary cooling circuit under varying loads
171. Pick out the correct statement?
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A. Ionising power of ?-rays is higher than that of ?-rays

B. Speed of ?-rays is more than that of ?-rays

C. In ?-decay, the ratio of neutron to proton decreases

D. Positron is the antiparticle of electron
172. Pick out the correct statement?
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A. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively

B. Gain of electrons by neutral atoms form cations

C. Proton to neutron ratio in a stable nucleus is 2 : 1

D. Loss of electrons from neutral atoms produces negative ions

173. Emission of ?-particles during radioactive decay of a substance is from__________________?
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A. None of these

B. Outermost shell

C. Nucleus

D. Innermost shell

174. Extraction of uranium from its ore is done using ______________ methods?
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A. Electrometallurgical

B. Physical beneficiation

C. Chemical

D. Pyrometallurgical

175. The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is_____________________?
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A. More

B. Less

C. Much more

D. Same

176. A thermal nuclear reactor compared to a fast breeder reactor ?
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A. Uses slower neutrons for fission

B. Requires less fuel to run at the same power level

C. Gives higher power density

D. Uses faster neutrons for fission

177. A control rod________________?
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A. Should have small absorption cross-section

B. Is generally made of boron, hafnium or cadmium

C. Should have large absorption cross-section

D. Both B. and C.
178. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher _____________________?
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A. All A., B. and C.

B. Resistance to effects of irradiation

C. Density; hence core volume for a given power output would be smaller

D. Melting point, hence can be subjected to higher temperature

179. An electron has a mass that is approximately ____________ that of the proton?
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A. 1836 (approximately)

B. ?

C. 1

D. 1/1836 (approximately)
180. What is the average life of a radioactive atom having a half life period of T ?
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A. 2T

B. 0.144 T

C. 1.44 T

D. 14.4 T