पिघली हुई धातु को डाउन स्प्रू (down sprue) में डालते समय छींटों और अशांति (turbulence) को कम करने के लिए किसका उपयोग किया जाता है?

Master patterns used in foundry shops generally have:

The provision of taper on the vertical faces of a mould pattern to facilitate its easy removal is called:

According to Chvorinov's rule, the solidification time of a casting is directly proportional to: