This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Chemical & Nuclear Reactions – I”.
1. Heat is generated in a nuclear reactor (thermal) by
a) fusion of atoms of uranium
b) absorption of neutrons in uranium atoms
c) combustion of nuclear fuel
d) fission of U-235 by neutrons
Explanation: In a nuclear reactor, heat is generated by the fission of U-235 by neutrons.
2. Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor
a) heavy water moderated
b) fast breeder
d) enriched uranium
Explanation: The conversion of Thorium-232 into Uranium-233 is done in a fast breeder.
3. An electron has a mass that is approximately __________ that of the proton.
d) none of the mentioned
Explanation: The mass of an electron is approx. 1/1836 times that of the mass of proton.
4. Which of the following may not need a control rod?
a) Candu Reactor
b) Liquid metal cooled reactor
c) Fast breeder reactor
d) None of the mentioned
Explanation: None of the reactors mentioned above require a control rod.
5. The amount of a radioactive material (having a half-life of 100 years) remaining after 400 years will be __________ of its original weight.
Explanation: The amount of a radioactive material (having a half-life of 100 years) remaining after 400 years will be 1/16 of its original weight [by using radioactive decay formula].
6. The amount of a radioisotope remaining un-decayed after a time equal to four times its half-life will be __________ percent.
Explanation: The amount of a radioisotope remaining un-decayed after a time equal to four times its half-life will be 6.25 percent.
7. The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half-life period is 12 years
Explanation: As per the radioactive decay rule, the required time will be 18 years.
8. 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 the mentioned
Explanation: None of the mentioned effects are produced by Gas cooling in comparison to water cooling.
9. The decay product of tritium is?
Explanation: Tritium decays into a Deuterium & a hydrogen atom.
Sanfoundry Global Education & Learning Series – Power Plant Engineering.
To practice all areas of Power Plant Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.