Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Nuclear Materials
1 - Question
Which one is the fertile fuel in nuclear industry?
Explanation: The fertile fuels which are used in nuclear fission reactor are- uranium-238, thorium-232 and fission fuels are – uranium-233, uranium-235, plutonium-239 and plutonium-241.
2 - Question
Which coolant mentioned below is used to remove liberated energy?
a) Heavy water
b) Stainless steel
Explanation: Coolants to remove liberated energy are – Na, NaK, Bi, purified H2, deuterium oxide or heavy water while zirconium, aluminum are the materials with low absorption property for neutrons.
3 - Question
In which ores U3O8 can be recovered as byproduct of phosphate fertilizer?
c) Monazite sands
d) Phosphate rock
Explanation: In phosphate rock inclusions U3O8 can be recovered as by-product of phosphate fertilizer production. Extraction is economic as long as carnotite and pitchblende exist in abundance.
4 - Question
Soda ash leaching’ comes into the picture in which type of removal of non-uranium constituents?
a) Ion exchange following acid leach
c) Solvent extraction
Explanation: Removal of non-uranium constituents is done by leaching, ion exchange following acid leach and solvent extraction. Acid leach on low limestones ores, salt roast, soda ash leach -these are comes under the leaching process.
5 - Question
In which form deuterium exists in natural water?
Explanation: Deuterium exists in natural water as HDO and in hydrogen from petroleum sources as HD. The isotopic atom percentage in both source type is 0.0143%. To produce 99+ % is a sizeable separation task.
6 - Question
Cryogenic process is coupled with which type of separating technique of deuterium?
a) Dual temperature exchange
d) Hydrogen distillation
Explanation: The cryogenic or low -temperature process must be coupled with a synthesis gas plant to extract the deuterium and effectively use the hydrogen for chemical synthesis or rocket propellant fuel.
7 - Question
Which material is used to purify ThO2?
a) Butyl phosphate
b) NaOH leaching
c) Butyl triphosphate
d) Acid leaching
Explanation: ThO2 can be purified with tertiary butyl phosphate in a similar manner as for U3O8.NaOH leaching is used to satisfactorily extract ThO2 from monazite.
8 - Question
Why fluidized bed is used in Uranium gaseous conversion process?
a) Good heat transfer
b) Low turbulent mixing
c) Production of low bulk density
d) Batch processing
Explanation: Fluidized beds are fluid-solid system in which the solid is maintained in suspension by gas flowing through a vertical reactor. It provides good heat transfer and internal heat exchanger surfaces permit high production rates in continuous processing.
9 - Question
Which type of reaction – UO2 + 4C -> UC2 + 2CO
a) Uranium metal fuel elements
b) Reduction with alkali
c) Uranium carbide
Explanation: This reaction is uranium carbide reaction. Due to the reaction between uranium oxide and carbon, uranium carbide is formed which is also preferable to uranium metal from a stability standpoint.
10 - Question
Which type of esters used in the solvent extraction process?
a) Inorganic phosphate
c) Organic phosphate
d) Low limestones ores
Explanation: This process is one of a removal of non-uranium constituents process. Solvent extraction of acid leach slurries is done by organic phosphate esters such as tributyl phosphate in kerosene.