Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part7 : 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 alloy used for making electrical resistances and heating elements is |
| nichrome |
| invar |
| magnin |
| elinvar |
| peiminvar. |
17.German silver contains |
| 1% silver |
| 2.5% silver |
| 5% silver |
| 10% silver |
| 100% silver. |
18.Addition of copper to aluminium results in |
| improvement of casting characteristics |
| improvement of corrosion resistance |
| one of the best known age and precipitation-hardening systems |
| improving machinability |
| none of the above. |
19.Phosphor bronze contains |
| 0.5% of phosphorous |
| 1% phosphorous |
| 2.5% phosphorous |
| 5% phosphorous |
| none of the above. |
20.Which is false statement about properties of aluminium |
| modulus of elasticity is fairly low |
| wear resistance is very good |
| fatigue strength is not high |
| creep strength limits its use to fairly low temperatures |
| corrosion resistance is good. |
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