McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 251. |
Pattern draft for internal surfaces is (in mm/m) |
| A. | 10 -- 30 |
| C. | 50 - 80 |
| E. | 40 - 70 |
| Answer» E. 40 - 70 | |
| 252. |
On drying the shrinkage of wood is least |
| B. | along the grains |
| C. | across the grains |
| E. | along the direction of tangent to the annular rings |
| Answer» B. along the grains | |
| 253. |
Contraction of metal starts at the end of |
| B. | mushy stage |
| C. | plastic stage |
| D. | liquid stage |
| E. | solid stage |
| Answer» B. mushy stage | |
| 254. |
In radiography test on castings which of the following rays are never used? |
| A. | X-rays |
| B. | beta rays |
| C. | gamma rays |
| D. | all of the above |
| Answer» B. beta rays | |
| 255. |
Metal moulds are used in |
| A. | dry sand moulding |
| B. | green sand moulding |
| C. | die casting process |
| E. | loam moulding |
| Answer» C. die casting process | |
| 256. |
The defect known as 'drop' occurs when the upper surface of the mould cracks and pieces of sand fall into the molten metal. This defect occurs due to |
| A. | low mould hardness |
| B. | insufficient reinforcement |
| C. | low green strength |
| D. | any of the above |
| Answer» D. any of the above | |
| 257. |
Investment casting finds application in all of the following EXCEPT |
| A. | Jet engine nozzles |
| C. | Milling cutters |
| D. | Buckets for superchargers |
| E. | Gold ornaments |
| Answer» E. Gold ornaments | |
| 258. |
Lowest pouring temperature alloy is |
| A. | Phosphor bronze |
| B. | Cupro nickel alloy |
| C. | Monel metal |
| D. | Tin bronze |
| Answer» C. Monel metal | |
| 259. |
The residual stresses in casting occur due to |
| A. | sand particles being taken into molten metal while pouring |
| B. | the insufficient gate size |
| C. | the differential solidification rate of thin and thick sections of casting |
| D. | none of the above |
| Answer» C. the differential solidification rate of thin and thick sections of casting | |
| 260. |
Local stress relief treatments are generally given to |
| A. | small castings |
| C. | non-ferrous castings |
| D. | all castings |
| E. | too large castings |
| Answer» E. too large castings | |
| 261. |
Which of the following is used on moulds for magnesium castings to prevent metal mould reactions? |
| A. | Boric sulphur |
| B. | Molasses |
| C. | Charcoal |
| D. | all of the above |
| Answer» A. Boric sulphur | |
| 262. |
Silica is the second most important constituent of moulding sand which provides |
| A. | binding strength |
| B. | refractoriness |
| C. | chemical resistance |
| D. | none of the above |
| Answer» A. binding strength | |
| 263. |
Flash occurs on diecastings at the |
| B. | gatting system |
| C. | ejection pins |
| D. | vents between the dies |
| E. | parting surface of two dies |
| Answer» E. parting surface of two dies | |
| 264. |
The methods of casting for producing ornamental pieces are |
| A. | pressed and slush casting |
| B. | slush and gravity casting |
| C. | gravity and semi permanent mould casting |
| D. | none of the above |
| Answer» A. pressed and slush casting | |
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