1. Why the quality of sand deteriorates if the same molding sand is used again and again? A. Build up of clay and other organic coatings on the molding sand particles B. Presence of foreign and scrap matter like iron particles, feyalite, etc. C. Occurrence of pieces of oil sand D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
2. Shrinkage allowances is also known as A. finish allowance B. contraction allowance C. taper allowance D. camber allowance Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
3. Green sand consists of A. 70% sand and 30% clay B. 40% sand and 60% clay C. 30% sand and 70% clay D. 60% sand and 40% clay Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
4. The low permeability in sand can cause which of the following defects in casting A. Rough surface B. Blow holes C. hot tears D. Drop Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
5. In a sand casting of a rectangular slab, the thickness of the solidified layer after 2 minutes is known to be 3 cm. Based on Chvorinov's rule, the solidified thickness (in cm) after 4 minutes is A. 1.8 B. 4.3 C. 6.8 D. 9.2 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
6. Feed heads, feeders and risers in casting serve to provide sources of molten metal to compensate for A. misruns B. cold shuts C. hot tears D. shrinkage Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
7. What are the applications of nodular cast iron? A. Paper industries machinery B. Power transmission equipment C. Construction machinery D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
8. In centrifugal castings, the impurities are . . . . . . . . A. Uniformly distributed B. Forced outside the surface C. Collected in the center of casting D. Present in the middle section of casting Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
9. The thickness of shells in shell molding is A. 0.3 to 0.6mm B. 0.6 to 0.9mm C. 0.9 to 1.2mm D. 1.2 to 1.5mm Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
10. Solidification time of a thin plate casting in a sand mould increases by approximately 4 times with the doubling of A. thickness B. length C. both width and length D. length, width and thickness Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
