Question 253 · LDEK · Dental laboratory technology
Choose correct sentences regarding the electrolytic polishing:
1) process of electrolytic polishing is effective in case of irregularities from 3,0 to 6,0 micrometres;
2) during the electrolytic polishing, the polished object is immersed in electrolyte, which consists in ethylene glycol, sulphuric acid and hydrochloric acid;
3) process of electrolytic polishing is effective in case of irregularities from 1,0 to 3,0 micrometres;
4) during electrolytic polishing, the polished object is connected to an anode;
5) during electrolytic polishing, the polished object is connected to a cathode;
6) during electrolytic polishing, both electrodes are immersed in electrolyte and create an electric circuit which is powered with alternating current;
7) the duration of electrolytic polishing is 2.5 hour minimum.
The correct answer is:
2) during the electrolytic polishing, the polished object is immersed in electrolyte, which consists in ethylene glycol, sulphuric acid and hydrochloric acid;
3) process of electrolytic polishing is effective in case of irregularities from 1,0 to 3,0 micrometres;
4) during electrolytic polishing, the polished object is connected to an anode;
5) during electrolytic polishing, the polished object is connected to a cathode;
6) during electrolytic polishing, both electrodes are immersed in electrolyte and create an electric circuit which is powered with alternating current;
7) the duration of electrolytic polishing is 2.5 hour minimum.
The correct answer is:
- A. 2, 3, 4.
- B. 1, 4.
- C. 1, 5, 7.
- D. 3, 6, 7.
- E. 1, 2, 7.
Hint
Electropolishing dissolves surface peaks; recall the polarity of the workpiece, the type of current and how fine the treated irregularities are.
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