1. The cutting edge of a chisel should be hardened tempered hardened and tempered case hardened ✅ The correct answer is option C.
2. The advantage of thermit welding is that all parts of the weld section are molten at the same time weld cools almost uniformly results in a minimum problem with internal residual stresses all of the above ✅ The correct answer is option D.
3. The upsetting is a process of increasing the cross-section of a bar reducing the cross-section of a bar joining the two surfaces of metal under pressure after heating bending of a bar ✅ The correct answer is option A.
4. The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as hot piercing extrusion cold peening cold heading ✅ The correct answer is option C.
5. An oxidising flame is obtained when equal volumes of oxygen and acetylene are supplied. TRUE FALSE ✅ The correct answer is option B.
6. Scribing block is used to hold the round bars during marking check the trueness of flat surfaces locate the centres of round bars check the surface roug ✅ The correct answer is option C.
7. The cold working of metals is carried out at the recrystallisation temperature below the recrystallisation temperature above the recrystallisation temperature at any temperature ✅ The correct answer is option B.
8. The minimum size of a bloom is 5 cm x 5 cm 10 cm x 10 cm 15 cm x 15 cm 20 cm x 20 cm ✅ The correct answer is option C.
9. In order to cut mild steel, the cutting angle of chisel should be 30° 45° 50° 60° ✅ The correct answer is option D.
10. In fore-hand welding, the weld is made from left to right from right to left first from left to right and then from right to left either from left to ri ✅ The correct answer is option B.