पॉलिमर एक्सट्रूज़न (extrusion) प्रक्रिया में, किस सेक्शन में पिघले हुए पदार्थ (melt) को पूरी तरह से समरूप (homogenised) किया जाता है और डाई ओपनिंग के माध्यम से पंप करने के लिए पर्याप्त दबाव विकसित किया जाता है?

A cutting process in which material is cut by a high-velocity jet of high-temperature ionised gas is known as:

Which of the following combinations of statements about hot extrusion processes is completely correct? 1. In forward hot extrusion, metal flows in the same direction as ram movement and friction exists between billet and container wall. 2. In backward hot extrusion, metal flows opposite to ram movement and billet-container friction is essentially eliminated. 3. In backward hot extrusion, extrusion pressure increases with billet length due to increased friction at container wall. 4. In hot extrusion of steels, molten glass is used as a lubricant and thermal insulator.