Air bubbles formed on the surface of casting is probably due to________________?

Related Mcqs:

Crucible indicated for casting base metal alloys is______________?

A. Carbon crucible B. Clay crucible C. Quartz crucible D. High melting plastic crucible...

Which of the following is function of fluoride flux in soldering process ?

A. It prevents the formation of copper oxide B. It prevents the formation of chromium oxide or dissolves chromic oxide layer C. It prevents the flow of material in undesirable area D. Increase the strength of solder...

Which of the following increases castability of base metal alloys________________?

A. Tin B. Beryllium C. Molybdenum D. Carbon...

With indirect spruing. Which one of the following porosities can be minimised_______________?

A. Back pressure porosity B. Localized shrinkage porosity C. Pin hole porosity D. Micro porosity...

Tempering of steel cause________________?

A. Increases its toughness B. Increases hardness C. Increase ductility D. decreases its toughness...