Which zone is the hottest and efficient burning zone of the flame used for casting ?

Related Mcqs:

Incomplete casting is the result of_____________?

A. More porous investment in the mould B. Narrow sprue diameter C. Hollow sprue pin D. Large reservoir...

Disadvantage of having a short sprue is________________?

A. Rapid solidification of metal B. No place for reservoirs C. Incomplete evacuation of gases D. Difficulty in removing casting from investment...

During soldering, the solidus temperature of the filler material should be_____________?

A. Greater than the substrate material B. Lesser than the substrate material C. Equal to the substrate material D. Temperature not relevant...

The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?

A. 2.3% B. 1.56% C. 1.37% D. 3%...

Localised shrinkage porosity is seen when there________________?

A. Thin sprue B. No reservoir C. Investment heated strongly D. Inadequate air discharge...