Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part4 : 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.Manganese in steel increases its |
| tensile strength |
| hardness |
| ductility |
| fluidity |
| malleability. |
12.Hardness of martensite is about |
| RC 65 |
| RC 48 |
| RC 57 |
| RC 80 |
| RC 32. |
13.Which is false statement about case hardening. Case hardening is done by |
| electroplating |
| cyaniding |
| induction hardening |
| nitriding |
| flame hardening. |
14.Amorphous material is one |
| in which atoms align themselves in a geometric pattern upon solidification |
| in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid |
| which is not attacked by phosphorous |
| which emits fumes on melting |
| none of the above. |
15.The surface hardness of the following order is achieved by nit riding operation |
| 600 VPN |
| 1500 VPN |
| 1000 to 1100 VPN |
| 250 VPN |
| 2000 VPN. |
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