Which of the following fuel gases is the best choice of heat source to carry out soldering process ?

Related Mcqs:

Glossy smooth margins of a casting are due to_____________?

A. Shrinkage of alloy on cooling B. Investment breakdown C. Incomplete wax elimination D. Incomplete gas elimination...

The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?

A. Pinhole porosity B. Gas inclusion porosity C. Micro porosity D. Subsurface porosity...

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...

Suck back porosity in the casting can be eliminated by________________?

A. Increasing the mould metal temperature difference B. Increasing the flow of molten metal C. Flaring the point of the sprue attachment D. All of the above...

The strength of a gypsum investment is dependent on_______________?

A. Carbon content B. Silica content C. Gypsum D. Copper...