McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 251. |
Electro-forming is particularly vauable for |
| A. | Non-ferrous components |
| B. | Good conductors of electricity |
| C. | Parts which cannot be machined |
| D. | Decorative items |
| E. | Thin walled parts requiring a high order of accuracy and internal surface finish |
| Answer» E. Thin walled parts requiring a high order of accuracy and internal surface finish | |
| 252. |
Wrought iron is |
| A. | Melts easily at 1500?C |
| B. | Easily hardened |
| C. | Used for castings |
| D. | Not used for castings |
| E. | Least resistant to corrosion fatigue stresses |
| Answer» B. Easily hardened | |
| 253. |
Which one is different from the remaining |
| A. | Flame hardening |
| B. | Electroplating |
| C. | Cynding |
| D. | Nitriding |
| E. | Pack carburizing |
| Answer» B. Electroplating | |
| 254. |
All of the following are examples of ceramic materials EXCEPT |
| A. | Bakelite |
| B. | Aluminium oxide |
| C. | Magnesium oxide |
| D. | Glass |
| E. | None of the above is true |
| Answer» A. Bakelite | |
| 255. |
Process of making a thin phosphate coating on steel to act as a base or primer for enamels and paints in known as |
| A. | Prepainting |
| B. | Colourizing |
| C. | Anodising |
| D. | Surface preparing |
| E. | Parkerizing |
| Answer» E. Parkerizing | |
| 256. |
A thermocouple works on which of the following effect? |
| A. | Thomson effect |
| B. | Seeback effect |
| C. | Peltier effect |
| D. | Joule effect |
| E. | None of the above |
| Answer» B. Seeback effect | |
| 257. |
The highest percentage of carbon that an iron carbon alloy can have is |
| A. | 3% |
| B. | 4.40% |
| C. | 12.12% |
| D. | 2% |
| E. | 6.60% |
| Answer» E. 6.60% | |
| 258. |
A lead based bearing alloy contains |
| A. | Lead-nickle-tin |
| B. | Lead-aluminium-copper |
| C. | Lead-antimony-tin-silver |
| D. | Lead-antimony-tin-copper |
| E. | Lead-copper-tin-copper |
| Answer» D. Lead-antimony-tin-copper | |
| 259. |
The solid solution carbon in alpha iron obtained on cooling of 0.2% carbon steel which have been heated above the third critical point is called |
| A. | Austenite |
| B. | Pearlite |
| C. | Ferrite |
| D. | Ferrite |
| E. | Cementite |
| Answer» D. Ferrite | |
| 260. |
Corrosion resistance of steels is increased by the addition of alloying elements like |
| A. | Tungsten |
| B. | Chromium and nickel |
| C. | Cobalt and vanadium |
| D. | Silicon and sulphur |
| E. | Sulphur |
| Answer» C. Cobalt and vanadium | |
| 261. |
Galena is the ore for |
| A. | Zinc |
| B. | Lead |
| C. | Germanium |
| D. | Aluminium |
| E. | Copper |
| Answer» B. Lead | |
| 262. |
Plastic deformation which is carried out in a temperature region and over a time interval such that the strain hardening is not relieved is known as |
| A. | Hot work |
| B. | Cold work |
| C. | Annealing |
| D. | Bauschinger effect |
| E. | None of the above |
| Answer» B. Cold work | |
| 263. |
Within elastic limits |
| A. | Load is gradually applied |
| B. | Deformation is permanent |
| C. | Deformation is proportional to the load |
| D. | Load is less |
| E. | Load is static |
| Answer» C. Deformation is proportional to the load | |
| 264. |
The ability of material to absorb energy when deformed elastically and to return it when unloaded is called |
| A. | Resilience |
| B. | Fatigue strength |
| C. | Creep |
| D. | Toughness |
| E. | Hardness |
| Answer» A. Resilience | |
| 265. |
The variable stress below which the probability of failure of a material is negligible, is called |
| A. | Endurance limit |
| B. | Tolerance limit |
| C. | Yield point |
| D. | Elastic limit |
| E. | Plastic limit |
| Answer» B. Tolerance limit | |
| 266. |
In a glass metal seal the two components must match with respect to their |
| A. | Fatigue strength |
| B. | Hardness |
| C. | Semi-conductors |
| D. | Ductility |
| E. | Thermal expansion |
| Answer» E. Thermal expansion | |
| 267. |
The phenomenon of materials in which slow extension of materials takes place with the time at constant load is known as |
| A. | Malleability |
| B. | Elasticity |
| C. | Plasticity |
| D. | Creep |
| E. | Ductility |
| Answer» D. Creep | |
| 268. |
Tensile strength of common varieties of cast iron is in the range |
| A. | 40 - 50 M Pa |
| B. | 50 - 80 M Pa |
| C. | 500 - 650 M Pa |
| D. | 650 - 1000 M Pa |
| E. | 140 - 500 M Pa |
| Answer» E. 140 - 500 M Pa | |
| 269. |
Which of the following material has least coefficient of expansion? |
| A. | Dead mild steel |
| B. | Brass |
| C. | Manganin |
| D. | Y-alloy |
| E. | Invar |
| Answer» E. Invar | |
| 270. |
Iron alloyed with carbon more than 2% is called |
| A. | Mild steel |
| B. | Carbon steel |
| C. | Cast iron |
| D. | Alloy steel |
| E. | High carbon steel |
| Answer» C. Cast iron | |
| 271. |
A surface damage which results when two surfaces in contact experience light periodic relative motion is |
| A. | Fretting |
| B. | Pitting |
| C. | Corrosion |
| D. | Surface wear |
| E. | None of the above |
| Answer» A. Fretting | |
| 272. |
During induction hardening the depth of hardening is controlled by |
| A. | Current |
| B. | Voltage |
| C. | Frequency |
| D. | Phase angle |
| E. | None of the above |
| Answer» B. Voltage | |
| 273. |
Stress concentration may be caused by |
| A. | Change in shape |
| B. | A home or a notch in the body |
| C. | Polishing or painting a surface |
| D. | Change in dimensions |
| E. | Change in cross-sectional area |
| Answer» B. A home or a notch in the body | |
| 274. |
Polystrene at room temperature is |
| A. | Brittle |
| B. | Malleable |
| C. | Ductile |
| D. | Soft |
| E. | None of the above |
| Answer» A. Brittle | |
| 275. |
Small end of a connecting rod forging is |
| A. | Super finished |
| B. | Ground |
| C. | Broached |
| D. | Honned |
| E. | Lapped |
| Answer» C. Broached | |
| 276. |
If steel is slowly cooled in furnace, the structure obtained is |
| A. | Pearlite |
| B. | Martensite |
| C. | Sorbite |
| D. | Acicular |
| E. | Troosite |
| Answer» A. Pearlite | |
| 277. |
Machinability of a metal depends on |
| A. | Tensile strength |
| B. | Hardness |
| C. | Toughness |
| D. | (A) and (B) above |
| E. | (B) and (C) above |
| Answer» D. (A) and (B) above | |
| 278. |
Which is expected to be strongest in tension? |
| A. | Aluminium wire |
| B. | Mild steel wire |
| C. | Piano wire |
| D. | Stainless steel wire |
| E. | Brass wire |
| Answer» C. Piano wire | |
| 279. |
When metal is deformed by cold work, severe stresses known as residual stresses are undesirable and to remove them |
| A. | The metal should be stressed in reverse direction |
| B. | The metal should be painted |
| C. | The metal should be reheated below recrystallization temperature |
| D. | The metal should be reheated above recrystallization temperature |
| E. | None of the above |
| Answer» C. The metal should be reheated below recrystallization temperature | |
| 280. |
The ability of a tool to resist softening at high temperatures is known as |
| A. | Super hardness |
| B. | Red hardness |
| C. | Extended hardness |
| D. | Double hardness |
| E. | None of the above |
| Answer» B. Red hardness | |
| 281. |
Which of the following is a mesomorphous material? |
| A. | Silver |
| B. | Brass |
| C. | Mica |
| D. | Gold |
| E. | Glass |
| Answer» C. Mica | |
| 282. |
Electron with energy level of 2 MeV is considered as |
| A. | Fast electron |
| B. | There is no consideration as such |
| C. | Dead slow electron |
| D. | Slow electron |
| E. | Super-fast electron |
| Answer» A. Fast electron | |
| 283. |
Shot peening |
| A. | Changes the crystalline structure of material |
| B. | Refines the grain structure |
| C. | Is done at recrystallization temperature |
| D. | Improves fatigue life of small parts |
| E. | Causes metal surface to be in tension and the layer beneath in compression |
| Answer» D. Improves fatigue life of small parts | |
| 284. |
when atoms are hold together by the sharing of valence electrons |
| A. | They form a covalent bond |
| B. | The valence electrons are free to move away from the atom |
| C. | Each shared electron leaves a hole |
| D. | Each atom becomes free to move |
| E. | None of the above |
| Answer» A. They form a covalent bond | |
| 285. |
When piece of 0.2% carbon steel is heated above third critical point the steel is a solid solution of carbon in gamma iron and called |
| A. | Ferrite |
| B. | Austenite |
| C. | Pearlite |
| D. | Eutectoid |
| E. | Cementite |
| Answer» B. Austenite | |
| 286. |
The common household glass is |
| A. | Lead glass |
| B. | Borosilicate glass |
| C. | Semi-conductors |
| D. | Soda lime glass |
| E. | High silica glass |
| Answer» D. Soda lime glass | |
| 287. |
Silicon doped with phosphorous is an |
| A. | intrinsic semi-conductor |
| B. | extrinsic semi-conductor |
| C. | p-type semi-conductor |
| D. | n-type semi-conductor |
| E. | None of the above |
| Answer» D. n-type semi-conductor | |
| 288. |
When a normal atom loses an electron, the atom |
| A. | Becomes a positive ion |
| B. | Becomes a negative ion |
| C. | Becomes a electrically neutral |
| D. | Is then free to move about |
| E. | None of the above |
| Answer» A. Becomes a positive ion | |
| 289. |
Steel pipes are generally manufactured by |
| A. | Forging process |
| B. | Machining process |
| C. | Extrusion process |
| D. | Cold working process |
| E. | Electroforming process |
| Answer» C. Extrusion process | |
| 290. |
Which of the following class of materials are good conductors of heat and electricity? |
| A. | Polymers |
| B. | Dielectries |
| C. | Ceramics |
| D. | Semi-conductors |
| E. | Metals |
| Answer» E. Metals | |
| 291. |
The ability of a material to absorb energy in the plastic range is known as |
| A. | Fatigue strength |
| B. | Resilience |
| C. | Toughness |
| D. | Hardness |
| E. | Creep |
| Answer» C. Toughness | |
| 292. |
Sorbite' is obtained when |
| A. | Quenching steel during transformation |
| B. | Steel is annealed |
| C. | A fully hardened steel is finally 'drawn' at about 677?C |
| D. | None of the above |
| E. | Copper nickel and chromium |
| Answer» B. Steel is annealed | |
| 293. |
Selenium is an |
| A. | intrinsic semi-conductor |
| B. | extrinsic semi-conductor |
| C. | p-type semi-conductor |
| D. | n-type semi-conductor |
| E. | None of the above |
| Answer» A. intrinsic semi-conductor | |
| 294. |
In ferromagnetic materials |
| A. | the atmic magnetic moments are anti-parallel and unequal |
| B. | the atomic magnetic moments are parallel |
| C. | the constituent is iron only |
| D. | one of the constituent is iron |
| E. | None of the above |
| Answer» B. the atomic magnetic moments are parallel | |
| 295. |
Machining properties of steel are improved by adding |
| A. | Chromium |
| B. | Lead |
| C. | Nickel |
| D. | Silicon |
| E. | Cobalt |
| Answer» B. Lead | |
| 296. |
In compression, a prism of brittle material will break |
| A. | Into large number of pieces |
| B. | By forming a bulge |
| C. | By shearing slong oblique plane |
| D. | In a direction along the direction of load |
| E. | None of the above |
| Answer» C. By shearing slong oblique plane | |
| 297. |
Monel metal consists of |
| A. | At which change of allotropic form takes place. |
| B. | Aluminium copper and nickel |
| C. | Zinc, copper and lead |
| D. | Zinc nickel and copper |
| E. | Nickel, lead and tin |
| Answer» B. Aluminium copper and nickel | |
| 298. |
Cadmium sulphide cell is a |
| A. | Photo conductive cell |
| B. | Solar cell |
| C. | Thermocouple |
| D. | Photovoltaic cell |
| E. | Photo emissive cell |
| Answer» A. Photo conductive cell | |
| 299. |
Which process is different from the others |
| A. | Drop forging |
| B. | Cold extruding |
| C. | Sand blasting |
| D. | Short peening |
| E. | Cold heading |
| Answer» A. Drop forging | |
| 300. |
By alloying copper with manganese which of the following increases? |
| A. | Specific gravity |
| B. | Tensile strength |
| C. | Melting point |
| D. | Electrical conductivity |
| E. | None of the above |
| Answer» B. Tensile strength | |
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