Suck back porosity is due to_________________?
Correct answer: D. Hot spot
- A. Attached impurities on undersurface of casting
- B. Inadequate melting temperature
- C. No rapid cooling
- D. Hot spot
Explanation
Suck-back porosity is shrinkage porosity caused by a hot spot, usually at the sprue-casting junction, where solidification is delayed and the area cannot receive liquid metal. The defect is therefore linked to localized overheating rather than simply slow cooling.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Metals and Alloys
125 free Metals and Alloys MCQs from Dental Materials, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Dental Materials questions like this
Dental Materials is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Metals and Alloys questions
Silver plated dyes use an electrolytic bath of_______________?
Most biocompatible material in oral cavity is_______________?
The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
Air bubbles formed on the surface of casting is probably due to________________?
Asbestos liner is used in a casting ring to________________?
Which of the following decrease with strain hardening______________?