Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Plutonium
- B. Natural uranium
- C. Enriched uranium
- D. Monazite sand
Explanation: Boiling water reactors generally use enriched uranium fuel, commonly uranium dioxide, so enough U-235 is present to sustain the chain…
Correct answer: Enriched uranium- A. 4
- B. 11.6
- C. 0
- D. 18.6
Explanation: Heavy water reaches its maximum density at about 11.6°C, not 4°C. The 4°C value applies to ordinary water, making it the likely trap.
Correct answer: 11.6- A. Electron
- B. Proton
- C. Neutron
- D. Position
Explanation: The atomic number rises from 93 to 94 while the mass number remains 239, which identifies beta-minus decay.
Correct answer: Electron- A. 10
- B. 18
- C. 20
- D. 36
Explanation: Heavy water is D₂O, containing two deuterium atoms of approximately 2 atomic mass units each and one oxygen atom of 16, giving a molecular…
Correct answer: 20- A. Fission products
- B. All A., B. & C.
- C. Unused fuel
- D. Plutonium
Explanation: Spent reactor fuel contains radioactive fission products, newly formed plutonium, and some unconsumed uranium fuel.
Correct answer: All A., B. & C.- A. Control the chain reaction
- B. Absorb the secondary neutrons
- C. Slow down the secondary neutrons
- D. None of these
Explanation: A moderator reduces the energy of fast neutrons produced during fission, increasing the likelihood that they will cause further fissions.
Correct answer: Slow down the secondary neutrons- A. None of these
- B. U-238
- C. Th-232
- D. U-235
Explanation: U-235 is fissile, meaning it undergoes fission readily after absorbing even slow thermal neutrons.
Correct answer: U-235- A. Cyclotron
- B. Geiger-Muller Counter
- C. Cold chamber
- D. Mass spectrograph
Explanation: A Geiger-Müller counter detects and counts ionising radiation, so its count rate indicates the rate of nuclear disintegration.
Correct answer: Geiger-Muller Counter- A. 0.2
- B. 7
- C. 35
- D. 50
Explanation: The carbon-dioxide coolant in the Calder Hall gas-cooled reactor operates at approximately 7 kgf/cm².
Correct answer: 7- A. Hydrogen
- B. Helium
- C. Tritium
- D. Deuterium
Explanation: A hydrogen bomb uses fusion of heavy hydrogen isotopes, especially deuterium and tritium.
Correct answer: Deuterium- A. Molten sodium
- B. Heavy water
- C. Ordinary water
- D. Helium
Explanation: Fast breeder reactors avoid moderators, so they use molten sodium, which removes heat efficiently without greatly slowing neutrons.
Correct answer: Molten sodium- A. Alwaye (in Kerala)
- B. Jadugoda (in Jharkhand)
- C. Kalpakkam (in Tamilnadu)
- D. Gopalpur coast (in Orissa)
Explanation: UCIL's uranium mining and concentration operations are located at Jadugoda in Jharkhand, one of India's principal uranium-producing areas.
Correct answer: Jadugoda (in Jharkhand)- A. Pressurised water reactor
- B. Gas cooled reactor
- C. Boiling water reactor
- D. Molten sodium cooled reactor
Explanation: A boiling water reactor is more prone to radioactive hazards outside the reactor vessel because its primary coolant boils and the…
Correct answer: Boiling water reactor- 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.
Explanation: Control rods must strongly absorb neutrons to regulate or stop the chain reaction, so they require a large absorption cross-section.
Correct answer: Both B. and C.- A. 10-12
- B. 1012
- C. 10-8
- D. 108
Explanation: An atom has a characteristic radius near 10⁻¹⁰ m, whereas its nucleus is near 10⁻¹⁴ m; cubing the radius ratio gives an atomic-to-nuclear…
Correct answer: 10121416. Heavy water used in the nuclear reactors to slow down the speed of neutrons is __________________?
- A. Highly purified water
- B. Water having dissolved salts of heavy metals
- C. A compound of oxygen and deuterium
- D. None of these
Explanation: Heavy water is deuterium oxide, D₂O, in which ordinary hydrogen is replaced by the isotope deuterium.
Correct answer: A compound of oxygen and deuterium- A. Fission
- B. Combustion
- C. None of these
- D. Thermonuclear
Explanation: The Sun's energy is produced by thermonuclear fusion, in which light hydrogen nuclei combine under extremely high temperature and…
Correct answer: Thermonuclear- A. Nucleus
- B. Innermost shell
- C. Outermost shell
- D. None of these
Explanation: Beta particles are high-energy electrons or positrons released from the nucleus when a neutron changes into a proton or vice versa.
Correct answer: Nucleus- A. High carbon steel
- B. Boron or cadmium
- C. Zircaloy
- D. Molybdenum
Explanation: Emergency safety or shutdown rods use strong neutron absorbers such as boron or cadmium, allowing the fission chain reaction to be rapidly…
Correct answer: Boron or cadmium- A. 0.71
- B. 99.29
- C. 0.015
- D. 29.71
Explanation: Natural uranium contains about 99.27 to 99.29% uranium-238 and about 0.71% uranium-235.
Correct answer: 99.29