Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part6 : 16 to 20
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.The tensile strength of wrought iron is maximum |
| along the lines of slag distribution |
| perpendicular to lines of slag dis-tribution |
| uniform in all directions |
| unpredictable |
| none of the above. |
17.Ductile cast iron |
| contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron |
| is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable |
| is produced by annealing process. It is soft, tough and easily machined metal |
| is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material |
| none of the above. |
18.Balls for ball bearings are made of |
| cast iron |
| mild steel |
| stainless steel |
| carbon-chrome steel |
| high carbon steel. |
19.Taps, dies and drills contain carbon |
| below 0.5% |
| below 1% |
| above 1% |
| above 2.2% |
| nil. |
20.The correct sequence for descending order of machinability is |
| grey cast iron, low carbon steel, wrought iron |
| low carbon steel, grey cast iron, wrought iron |
| wrought iron,low carbon steel, grey cast iron |
| wrought iron, grey cast iron, low carbon steel |
| grey cast iron, wrought iron, low carbon steel. |
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