
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. |
More Engineering Materials QUESTIONS AND ANSWERS available in next pages
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