This set of Energy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Disposal of Nuclear Waste”.
1. What is the major problem in nuclear plants?
a) Drawing out energy
b) Fusion of particles
c) Disposal of nuclear waste
d) Handling of fuel
Explanation: One of the major problems in the nuclear power plant is the disposal of waste products which are highly radioactive. They emit large quantities of γrays and these high energy γ rays destroy all living matter through which pass.
2. A 400 MW nuclear power station would produce a equivalent radium of _____________
a) 100 tons daily
b) 1000 tons daily
c) 500 tons daily
d) 10 tons daily
Explanation: The radio-active products of a 400MW power station would be equivalent to 100 tons of radium daily and the radioactive effect of this plant product if exposed to atmosphere would kill all the living organisms within the area of about 100 sq miles.
3. How are moderate active solid wastes disposed?
a) Buried underground
b) Buried under sea
c) Sent to outer space
d) Left out in streams or rivers
Explanation: In a nuclear fuel cycle, the solid, liquid and gaseous radioactive wastes are produced at different stages. These radioactive wastes must be disposed off in such a manner that there is no hazard to the human and plant life. Moderate active solid wastes are buried in the ground.
4. Moderate liquid nuclear wastes are disposed into ___________
a) Deep pits
b) Buried underground
c) Left into rivers
d) Left into deep oceans
Explanation: Moderate liquid wastes after preliminary treatments are discharged in deep pits or day well from which they sweep out into the surrounding. Certainly liquid wastes are mixed with some kind of other chemical in order to lower their radioactivity.
5. Which type of disposal of nuclear waste is cheapest and easiest method of all?
Explanation: This is one of the easy and cheapest methods of disposal because soil absorbs radioactive material easily. This disposal is suitable mostly in areas of low rainfall at points which are high above the ground water level.
6. How are active liquids of nuclear waste disposed?
a) Stored in concrete tanks and buried underground
b) Stored in concrete tanks and buried in sea
c) Mixed with other chemicals and left into free atmosphere
d) They are reused and burnt away in gaseous fumes
Explanation: Active liquids are kept in concrete tanks and these tanks are buried in the ground till their decay of radio activity. Many times the radio activity increases the temperature of the liquid waste or sometimes these liquids boil and the activity decreases with time.
7. What are the ways in which most of radio activeness is removed?
a) Infusing them with other metal
b) Neutralizing them by diluting in chemical solutions
c) Storing them
d) Segregating them into small packs
Explanation: Most of the radio activeness of waste is removed just by storage. The storage problem is simplified by separating cersium and strontium which are extremely radioactive. These are generally stored in tanks which are buried in ground and then disposed in to the sea after 13 years of storage.
8. Can vacated coal mines be used for waste disposal?
Explanation: Yes, vacated coal mines can be used for waste disposal. The wastes are disposed in the salt heaps provided in the mines, because salt is a powerful absorber of radioactive emissions. It will be easy and more economical method to dispose of liquid waste by freezing.
9. How is High Level solidified nuclear wastes (HLW) stored?
a) Concrete tanks
c) Packed rock salt
d) Soil bins
Explanation: The solidified waste is placed in canisters that are stored in holes formation for thousands of years. The solidified waste is placed in canisters that are stored in holes drilled in rock salt with a spacing of 10 m to allow efficient dissipation of energy without exceeding temperature limits of either canister or salt. Each canister requires 100 m2 of salt for cooling.
10. What is the approx cost of disposing nuclear waste into sea per cubic meter?
a) 50 rs
b) 300 rs
c) 500 rs
d) 1000 rs
Explanation: In many places the liquid waste is disposed off to the sea through the pipes carried from the plant to the point of disposal. While disposing into the sea it should be seen that the activity level should not affect the marine life. The approximate cost of disposal by this method is 300 rs per cubic meter.
11. Absorption of radioactive element by human, affects their offspring’s.
Explanation: Absorption of neutron or radioactive element by a tissue nucleus leads to radioactive nucleus which results change in chemical nature, mal-functioning of cell. Due to this, cell damages leading to genetic modification. Inhale of radioactive material through air, food and water result radiation hazard.
12. For how many days is radioactive solid waste kept is kept under water at 6m deep for initial cooling?
a) 15 days
b) 50 days
c) 30 days
d) 100 days
Explanation: It is necessary to keep the radioactive solid waste first in the water of 6m depth nearly for 100 days. It was found that after 100 days cooling of radioactive waste of 28MW plant in water still has a radioactivity equal to million grams of radium. About 50% radioactive elements disappear during cooling.
13. What are released into biosphere from nuclear power plants?
a) Gaseous effluents
b) Waste Product
d) The obtained product
Explanation: Under normal operation, gaseous effluents are released slowly from the power plants into the biosphere and become diluted and dispersed harmlessly. Releasing at slow rates gives it time to blow of slowly.
14. Tailings forms are the residues from ____________
Explanation: Tailings are residues from uranium mining and milling operations. They contain low concentration of naturally occurring radioactive materials. They are generated in large volumes and are stored at the mine or mill sites.
15. LLW stands for ____________
a) Low Level Water
b) Low Laser width
c) Low Level Waste
d) Loss of Levels in water
Explanation: Low Level Waste contains less than 10 nCi per gram of transuranium contaminants containing low but potentially hazardous concentrations of radioactive materials. These are generated in almost all activities involving radioactive materials, require little or no shielding.
Sanfoundry Global Education & Learning Series – Energy Engineering.
To practice all areas of Energy Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.