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.
Last updated
2,710 questions · page 72 of 136
- A. Concrete
- B. Boron
- C. 18/8 stainless steel
- D. All A., B. and C.
Explanation: A good moderator should slow neutrons efficiently while absorbing very few of them.
Correct answer: All A., B. and C.- A. Magnesium diuranate
- B. Uranium oxide
- C. Uranium carbide
- D. Uranium
Explanation: The Jaduguda uranium-processing plant historically produced magnesium diuranate, commonly called yellow cake, as the concentrate obtained…
Correct answer: Magnesium diuranate- A. Thorium-233
- B. Uranium-233
- C. Uranium-235
- D. Plutonium-239
Explanation: Thorium-232 absorbs a neutron to form thorium-233, which undergoes beta decay through protactinium-233 and ultimately becomes fissile…
Correct answer: Uranium-233- A. Is recovered from spent fuel from thermal nuclear reactor
- B. Has much lower melting point (640°C ) compared to thorium (1690°C)
- C. Both A. and B.
- D. Neither A. nor B.
Explanation: Plutonium is recovered by reprocessing spent fuel from thermal reactors, and its melting point is about 640°C, far below thorium's value…
Correct answer: Both A. and B.- A. Carnotite
- B. Thorium
- C. Rescolite
- D. Pitchblende
Explanation: Pitchblende, a uranium oxide ore, generally contains the highest uranium concentration among these choices.
Correct answer: Pitchblende- A. Mass
- B. Both A. & B.
- C. Atomic
- D. Neither A. nor B.
Explanation: In nuclear reactions, conservation applies to mass number and atomic number: the total nucleon count and total charge remain balanced on…
Correct answer: Both A. & B.- A. 1-25
- B. > 1
- C. < 0.025
- D. > 200
Explanation: Thermal neutrons have energies near 0.025 eV at room temperature, much lower than 1 eV.
Correct answer: < 0.025- A. 32
- B. 52
- C. 72
- D. 88
Explanation: A light-water reactor is limited by the steam-cycle temperature and pressure, giving a net thermal efficiency of roughly 30 to 35 percent.
Correct answer: 32- A. Fast breeder reactor
- B. Candu reactor
- C. Homogeneous reactor
- D. Pressurised water reactor
Explanation: Fast breeder reactors use fast neutrons to sustain fission and breed fissile material, so they deliberately avoid a moderator.
Correct answer: Fast breeder reactor- A. Insulation lining of the reactor
- B. Retarder of neutron velocity
- C. Lubricant
- D. Fuel
Explanation: Graphite slows fast neutrons through repeated elastic collisions without strongly absorbing them, improving the chance of fission in fuels…
Correct answer: Retarder of neutron velocity- A. Proximity to fuel source
- B. Abundant availability of water
- C. Remotely located from residential areas
- D. Absence of earthquake prone zone in nearby areas
Explanation: Seismic safety is a primary site-selection concern because a major earthquake can damage the reactor, cooling systems, and containment…
Correct answer: Absence of earthquake prone zone in nearby areas- A. None of these
- B. Supplying intense fields or beams of neutron for scientific experiments
- C. Marine ship propulsion
- D. The production of radioisotopes
Explanation: Nuclear reactors are used to produce radioisotopes, provide neutron beams for research, and propel marine vessels.
Correct answer: None of these- A. Accelerating the reaction rate in the core
- B. Rapid heat transfer from the core
- C. Breeding neutrons
- D. Accelerating the neutrons
Explanation: Molten metals such as sodium have high thermal conductivity and can remove heat rapidly from the reactor core.
Correct answer: Rapid heat transfer from the core- A. 3
- B. 235
- C. 200
- D. 92
Explanation: Fission of one uranium-235 nucleus by a slow neutron releases about two to three secondary neutrons, commonly stated as three in basic…
Correct answer: 3- A. Electron capture
- B. Positron emission
- C. α-emission
- D. β-emission
Explanation: In beta-minus emission, a neutron changes into a proton, so the atomic number increases by one while the mass number remains unchanged.
Correct answer: β-emission- A. causing fission
- B. Chain reaction and hence the power output by regulating the number of secondary neutrons
- C. Emission of hazardous radiation
- D. Conversion of fissile material into fertile material
- E. Velocity of the secondary neutrons
Explanation: Control rods absorb neutrons, thereby regulating the number of neutrons available for further fissions and controlling reactor power.
Correct answer: Chain reaction and hence the power output by regulating the number of secondary neutrons- A. First
- B. Second
- C. Third
- D. Zero
Explanation: Radioactive decay follows first-order kinetics because the decay rate is proportional to the number of undecayed nuclei present.
Correct answer: First- A. Rawatbhata (Rajasthan)
- B. Kaiga (Karnataka)
- C. Talcher (Orissa)
- D. Kalpakkam (Tamilnadu)
Explanation: Kaiga, Rawatbhata, and Kalpakkam are nuclear power locations. Talcher is chiefly known for a coal-based thermal power station, not a…
Correct answer: Talcher (Orissa)1439. Liquid metal (e.g., molten sodium) is preferred as a coolant in case of a/an ______________ reactor?
- A. Homogeneous
- B. Graphite moderated
- C. Enriched uranium (3% U-235) fuelled
- D. Fast breeder
Explanation: Liquid sodium is used as a coolant in fast breeder reactors because it transfers heat efficiently and does not significantly slow…
Correct answer: Fast breeder- A. Fuel are present in different phases (e.g. uranium and heavy water)
- B. Coolant are present in different phases (e.g., heavy water and graphite)
- C. Coolant are different materials
- D. None of these
Explanation: A heterogeneous reactor has the fuel and moderator in physically different phases or separate forms, such as solid uranium fuel and liquid…
Correct answer: Fuel are present in different phases (e.g. uranium and heavy water)