Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part6 : 11 to 15
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.Bell metal contains |
| 70% copper and 30% zinc |
| 90% copper and 10% tin |
| 85-92% copper and rest tin with little lead and nickel |
| 70-75% copper and rest tin |
| 70-75% copper and rest zinc and tin. |
12.Brass contains |
| 70% copper and 30% zinc |
| 90% copper and 10% tin |
| 85-92% copper and rest tin with little lead and nickel |
| 70-75% copper and rest tin |
| 70% copper and 30% tin. |
13.Preheating is essential in welding |
| cast iron |
| high speed steel |
| all non-ferrous materials |
| all of the above |
| none of the above. |
14.Corrosion resistance of steel is increased by adding |
| chromium and nickel |
| nickel and molybdenum |
| aluminium and zinc |
| tungsten and sulphur |
| none of the above. |
15.Which one of the following metals would work-harden more quickly than the others? |
| copper |
| brass |
| lead |
| silver |
| aluminium. |
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