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MCQOPTIONS
This section includes 224 Mcqs, each offering curated multiple-choice questions to sharpen your Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Endentor used in Vickers hardness testing machine is |
| A. | Diamond square-based pyramid |
| B. | 10 mm dia ball |
| C. | 15 mm dia ball |
| D. | 25 mm dia ball |
| E. | Conical indentor with 120? apex angle |
| Answer» B. 10 mm dia ball | |
| 202. |
For normalizing, steel is heated to |
| A. | 900?C |
| B. | 30?C to 60?C above critical temperature |
| C. | 700?C |
| D. | 100?C below critical temperature |
| E. | Critical temperature |
| Answer» C. 700?C | |
| 203. |
During hardening soft spots can be avoided by |
| A. | using a more effective cooling medium |
| B. | protecting against decarburization in heating |
| C. | obtaining a more homogeneous structure employing annealing or normalising before hardening |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» E. Low specific heat of quenching oil | |
| 204. |
Percentage of iron in pig iron approximately |
| A. | 95% |
| B. | 80% |
| C. | 90% |
| D. | 99.90% |
| E. | 78% |
| Answer» D. 99.90% | |
| 205. |
When steel is made from phosphatic iron, it is likely to be |
| A. | Hard |
| B. | Ductile |
| C. | Brittle |
| D. | Tough |
| E. | Malleable |
| Answer» D. Tough | |
| 206. |
Major constituent of phosphor bronze is |
| A. | Zinc |
| B. | Copper |
| C. | Phosphorous |
| D. | Aluminium |
| E. | Lead |
| Answer» C. Phosphorous | |
| 207. |
Which hardening process is generally not used for steels? |
| A. | Age hardening |
| B. | Pack carburising |
| C. | Induction hardening |
| D. | Nitriding |
| E. | Cyanidin |
| Answer» B. Pack carburising | |
| 208. |
Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be |
| A. | 7A |
| B. | 170 A |
| C. | 70 A |
| D. | 0.7 A |
| E. | 0.07 A |
| Answer» E. 0.07 A | |
| 209. |
The depth of hardening is affected by |
| A. | Size of specimen |
| B. | Hardenability of steel |
| C. | Quenching medium |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» E. Low specific heat of quenching oil | |
| 210. |
Nodular iron has low |
| A. | Melting point |
| B. | Tensile strength |
| C. | Fluidity |
| D. | Machinability |
| E. | Rapid heating |
| Answer» B. Tensile strength | |
| 211. |
Steel recommended for induction hardening should have |
| A. | Rough surface |
| B. | Fine grains |
| C. | Low electrical and thermal conductivity |
| D. | Coarse grains |
| E. | Low alloy content |
| Answer» C. Low electrical and thermal conductivity | |
| 212. |
Heating elements of electrical heaters are made of |
| A. | Nichrome |
| B. | Tungsten |
| C. | Invar |
| D. | Nicheloy |
| E. | Phosphor bronze |
| Answer» B. Tungsten | |
| 213. |
Which of the following material is used for permanent magnets? |
| A. | Duralumin |
| B. | Elnivar |
| C. | Delta metal |
| D. | Invar |
| E. | Alnico |
| Answer» F. | |
| 214. |
If the steel at room temperature is magnetic, the presence of which constituent can be ruled out? |
| A. | Ferrite |
| B. | Pearlite |
| C. | Austenite |
| D. | Cementite |
| E. | None of the above |
| Answer» D. Cementite | |
| 215. |
Which of the following element does not impart hardness to steel? |
| A. | Copper |
| B. | Nickel |
| C. | Silicon |
| D. | Chromium |
| E. | None of the above |
| Answer» B. Nickel | |
| 216. |
The upper range of mercury thermometer can be increased by |
| A. | Filling the stem with nitrogen under pressure |
| B. | Increasing tube diameter |
| C. | Taking into account expansion of tube |
| D. | Range cannot be increased |
| E. | Providing steel tube |
| Answer» B. Increasing tube diameter | |
| 217. |
Which of the following is high speed steel? |
| A. | T 55 Ni Cr 65 Mo 30 |
| B. | T 75 W 18 Co 6 Cr 4 |
| C. | T 10 Cr 5 Mo 75 V 23 |
| D. | T 75 W 18 Co 6 Cr 4 V 1 Mo 75 |
| E. | None of the above |
| Answer» E. None of the above | |
| 218. |
Which of the following is usually made of high carbon steel? |
| A. | Channels |
| B. | Die blocks |
| C. | Hammers |
| D. | Solid drawn tubes |
| E. | Angle iron |
| Answer» D. Solid drawn tubes | |
| 219. |
The property which enables metals to be drawn into wire is known as |
| A. | Plastic deformation |
| B. | Ductility |
| C. | Malleability |
| D. | Elastic deformation |
| E. | Straining |
| Answer» C. Malleability | |
| 220. |
In order to improve machinability of stainless steels |
| A. | 0.2 percent selenium is added |
| B. | 0.35 percent sulphur is added |
| C. | 0.5 percent manganese is added |
| D. | (A) and (B) above |
| E. | (B) or (C) above |
| Answer» E. (B) or (C) above | |
| 221. |
The electrical conductivity of ferrites is |
| A. | Very high as compared to that of ferromagnetic materials |
| B. | Greater than that of ferromagnetic materials |
| C. | Equal to that of ferromagnetic materials |
| D. | Very low as compared to that of ferromagnetic materials |
| E. | Less than that of ferromagnetic materials |
| Answer» F. | |
| 222. |
The unit of diffusion coefficient is |
| A. | metre second |
| B. | Presence of cementite |
| C. | metre2 second-1 |
| D. | metre second-1 |
| E. | metre-2 second-1 |
| Answer» F. | |
| 223. |
In nodular iron, graphite is present in the form of |
| A. | Powder |
| B. | Flakes |
| C. | Needles |
| D. | Spheroids |
| E. | Prisms |
| Answer» E. Prisms | |
| 224. |
The flux used in brazing is usually |
| A. | Common salt |
| B. | Lime |
| C. | Borax |
| D. | Alum |
| E. | None of the above |
| Answer» D. Alum | |