METAL FORMING AND CASTING PROCESS Pick out the most appropriate option: 1. Advantage of cold working is (a) better dimensional accuracy (b) better surface finish (c) higher strength (d ) all of these. 2. Typical hot working temperature range for steel is (a) 650–1050°C (b) 650–723°C (c) 500–910°C (d ) none of these. 3. The forging operation of “upsetting” is (a) reverse of drawing down process (b) it is a bending operation (c) it is a drifting operation (d ) none of these. 4. “Alligatoring” is a defect associated with (a) forging process (b) casting process (c) extrusion process (d ) rolling process. 5. A “die” is used in (a) casting process (b) extrusion process (c) forging process (d ) all of these. 6. Out of the following, which is the defect which is not associated with casting process: (a) Blow holes (b) Scale (c) Centre burst (d ) Hot tear. 7. Which “term” is not associated with casting process? (a) Gate (b) Runner (c) Riser (d ) Swage. 8. Fuel used in a cupola consists of (a) steam coal (b) furnace oil (c) electricity (d ) hard coke. 9. Which allowance is not provided on the “pattern” made for a casting ? (a) Machining allowance (b) Solidification allowance (c) Draft allowance (d ) Shrinkage allowance. 10. “Blanking” is an expression used in (a) sheet metal work (b) casting process (c) drawing (d ) rolling. Indicate, if following statements are True or False:
1. Mechanical working processes result information of grain-flow lines which reduces the strength of parts. 2. “Blow hole” and shrinkage cavities occur in castings.The factors which cause these defects are similar in nature. 3. Sand mould is an example of permanent mould. 4. Mismatch is shift of the individual parts of a casting with respect to each other. 5. Hooker extrusion is a cold extrusion process. 6. The permeability of fine grained moulding sand will be more.
