MCQOPTIONS
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MCQOPTIONS
This section includes 482 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
*/*_Addition of lead and bismuth to aluminium results in? |
| A. | Improvement of casting characteristics |
| B. | Improvement of corrosion resistance |
| C. | One of the best known age and precipitation hardening systems |
| D. | Improving machinability |
| Answer» E. | |
| 252. |
*/*_Machining properties of steel are improved by adding? |
| A. | Sulphur, lead, phosphorous |
| B. | Silicon, aluminium, titanium |
| C. | Vanadium, aluminium |
| D. | Chromium, nickel |
| Answer» B. Silicon, aluminium, titanium | |
| 253. |
*/*_Free carbon in iron makes the metal? |
| A. | Soft and gives a coarse grained crystalline structure |
| B. | Soft and gives a fine grained crystalline structure |
| C. | Hard and gives a coarse grained crystalline structure |
| D. | Hard and gives a fine grained crystalline structure |
| Answer» B. Soft and gives a fine grained crystalline structure | |
| 254. |
*/*_Aluminium bronze contains aluminium and copper in the ratio of? |
| A. | 50 : 50 |
| B. | 40 : 60 |
| C. | 60 : 40 |
| D. | 10 : 90 |
| Answer» E. | |
| 255. |
*/*_Steel made from phosphate iron is? |
| A. | Brittle |
| B. | Hard |
| C. | Ductile |
| D. | Tough |
| Answer» B. Hard | |
| 256. |
*/*_Which is false statement about tempering? Tempering is done to? |
| A. | Improve machinability |
| B. | Improve ductility |
| C. | Improve toughness |
| D. | Release stresses |
| Answer» B. Improve ductility | |
| 257. |
*/*_Dislocations in materials refer to the following type of defect? |
| A. | Point defect |
| B. | Line defect |
| C. | Plane defect |
| D. | Volumetric defect |
| Answer» C. Plane defect | |
| 258. |
*/*_The material in which the atoms are arranged regularly in some directions but not in others, is called? |
| A. | Amorphous material |
| B. | Mesomorphous material |
| C. | Crystalline material |
| D. | None of these |
| Answer» C. Crystalline material | |
| 259. |
*/*_Weld decay is the phenomenon found with? |
| A. | Cast iron |
| B. | Mild steel |
| C. | Nonferrous materials |
| D. | Stainless steel |
| Answer» E. | |
| 260. |
*/*_Hematite iron ore contains iron about? |
| A. | 30% |
| B. | 45% |
| C. | 55% |
| D. | 70% |
| Answer» E. | |
| 261. |
*/*_When the steel is normalized, its? |
| A. | Yield point increases |
| B. | Ductility decreases |
| C. | Ultimate tensile strength increases |
| D. | All of these |
| Answer» E. | |
| 262. |
*/*_A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as? |
| A. | Allotropic change |
| B. | Recrystallization |
| C. | Heat treatment |
| D. | Precipitation |
| Answer» B. Recrystallization | |
| 263. |
*/*_Points of arrest for iron correspond to? |
| A. | Stages at which allotropic forms change |
| B. | Stages at which further heating does not increase temperature for some time |
| C. | Stages at which properties do not change with increase in temperature |
| D. | There is nothing like points of arrest |
| Answer» B. Stages at which further heating does not increase temperature for some time | |
| 264. |
*/*_Brass is an alloy of? |
| A. | Copper and zinc |
| B. | Copper and tin |
| C. | Copper, tin and zinc |
| D. | None of these |
| Answer» B. Copper and tin | |
| 265. |
*/*_Blast furnace is used to produce? |
| A. | Pig iron |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» B. Cast iron | |
| 266. |
%_Inconel is an alloy of_% |
| A. | Nickel, chromium and iron |
| B. | Nickel, copper |
| C. | Nickel, Chromium |
| D. | Nickel, zinc |
| Answer» B. Nickel, copper | |
| 267. |
%_The property of a material essential for spring materials is_% |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 268. |
%_Taps dies and drills contain carbon_% |
| A. | Below 0.5% |
| B. | Below 1% |
| C. | Above 1% |
| D. | Above 2.2% |
| Answer» D. Above 2.2% | |
| 269. |
%_Cementite consist of_% |
| A. | 13% carbon and 87% ferrite |
| B. | 13% cementite and 87% ferrite |
| C. | 13% ferrite and 87% cementite |
| D. | 6.67% carbon and 93.33% iron |
| Answer» E. | |
| 270. |
%_Duralumin contains_% |
| A. | 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium |
| B. | 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium |
| C. | 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium |
| D. | 5 to 6% tin, 2 to 3% copper and rest aluminium |
| Answer» B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium | |
| 271. |
%_Wrought iron is_% |
| A. | Hard |
| B. | High in strength |
| C. | Highly resistant to corrosion |
| D. | Heat treated to change its properties |
| Answer» D. Heat treated to change its properties | |
| 272. |
%_The elastic stress strain behavior of rubber is_% |
| A. | Linear |
| B. | Nonlinear |
| C. | Plastic |
| D. | No fixed relationship |
| Answer» C. Plastic | |
| 273. |
_ The ability of a material to absorb energy in the plastic range is called$? |
| A. | Resilience |
| B. | Creep |
| C. | Fatigue strength |
| D. | Toughness |
| Answer» B. Creep | |
| 274. |
_ Pick up wrong statement about wrought iron$? |
| A. | It contains carbon of the order of 0 to 0.25% |
| B. | It melts at 1535°C |
| C. | It is very soft and ductile |
| D. | It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling |
| Answer» E. | |
| 275. |
_ High carbon steel carries carbon percentage$? |
| A. | 0.1 to 0.3% |
| B. | 0.3 to 0.6% |
| C. | 0.6 to 0.8% |
| D. | 0.8 to 1.5% |
| Answer» E. | |
| 276. |
_ The alloy used for making electrical resistances and heating elements is$? |
| A. | Nichrome |
| B. | Invar |
| C. | Magnin |
| D. | Elinvar |
| Answer» B. Invar | |
| 277. |
_ Which of the following elements does not impart hardness to steel?$? |
| A. | Copper |
| B. | Chromium |
| C. | Nickel |
| D. | Silicon |
| Answer» B. Chromium | |
| 278. |
_ Corrosion resistance of steel is increased by adding$? |
| A. | Chromium and nickel |
| B. | Nickel and molybdenum |
| C. | Aluminium and zinc |
| D. | Tungsten and sulphur |
| Answer» B. Nickel and molybdenum | |
| 279. |
_ Cast iron is characterized by minimum of following percentage of carbon$? |
| A. | 0.2% |
| B. | 0.8% |
| C. | 1.3% |
| D. | 2% |
| Answer» E. | |
| 280. |
_ Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?$? |
| A. | Bessemer process |
| B. | Open hearth process |
| C. | Electric process |
| D. | LD process |
| Answer» E. | |
| 281. |
_ Following elements have face-centered cubic structure$? |
| A. | Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt |
| B. | Mg, Zn, Ti, Zr, Br, Cd |
| C. | A iron (below 910°C and between 1400 to 1539°C), W |
| D. | All of the above |
| Answer» B. Mg, Zn, Ti, Zr, Br, Cd | |
| 282. |
_ Pick up the wrong statement$? |
| A. | Aluminium in steel results in excessive grain growth |
| B. | Manganese in steel induces hardness |
| C. | Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility |
| D. | Tungsten in steels improves magnetic properties and hardenability |
| Answer» B. Manganese in steel induces hardness | |
| 283. |
_ Tungsten in high speed steel provides$? |
| A. | Hot hardness |
| B. | Toughness |
| C. | Wear resistance |
| D. | Sharp cutting edge |
| Answer» B. Toughness | |
| 284. |
_ Heavy duty leaf and coil springs contain carbon of the following order$? |
| A. | 0.2% |
| B. | 0.5% |
| C. | 0.8% |
| D. | 1.0% |
| Answer» E. | |
| 285. |
_ Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 286. |
_ Perminvar alloy having constant permeability is an alloy of$? |
| A. | Nickel, copper and iron |
| B. | Nickel, copper and zinc |
| C. | Copper, nickel and antimony |
| D. | Iron, zinc and bismuth |
| Answer» B. Nickel, copper and zinc | |
| 287. |
_ The surface hardness of the following order is achieved by nitriding operation$? |
| A. | 600 VPN |
| B. | 1500 VPN |
| C. | 1000 to 1100 VPN |
| D. | 250 VPN |
| Answer» D. 250 VPN | |
| 288. |
_ Duralumin contains$? |
| A. | 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium |
| B. | 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium |
| C. | 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium |
| D. | 5 to 6% tin, 2 to 3% copper and rest aluminium |
| Answer» B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium | |
| 289. |
_ Connecting rod is, usually, made from$? |
| A. | Low carbon steel |
| B. | High carbon steel |
| C. | Medium carbon steel |
| D. | High speed steel |
| Answer» D. High speed steel | |
| 290. |
_ The compressive strength of cast iron is __________that of its tensile strength.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 291. |
_ Large forgings, crank shafts, axles normally contain carbon up to$? |
| A. | 0.05 to 0.20% |
| B. | 0.20 to 0.45% |
| C. | 0.45 to 0.55% |
| D. | 0.55 to 1.0% |
| Answer» D. 0.55 to 1.0% | |
| 292. |
_ The lower critical temperature$? |
| A. | Decreases as the carbon content in steel increases |
| B. | Increases as the carbon content in steel increases |
| C. | Is same for all steels |
| D. | Depends upon the rate of heating |
| Answer» D. Depends upon the rate of heating | |
| 293. |
_ Wrought iron is$? |
| A. | Hard |
| B. | High in strength |
| C. | Highly resistant to corrosion |
| D. | Heat treated to change its properties |
| Answer» D. Heat treated to change its properties | |
| 294. |
_ Cementite consist of$? |
| A. | 13% carbon and 87% ferrite |
| B. | 13% cementite and 87% ferrite |
| C. | 13% ferrite and 87% cementite |
| D. | 6.67% carbon and 93.33% iron |
| Answer» E. | |
| 295. |
_ Gamma-iron occurs between the temperature ranges of$? |
| A. | 400°C to 600°C |
| B. | 600°C to 900°C |
| C. | 900°C to 1400°C |
| D. | 1400°C to 1530°C |
| Answer» D. 1400¬¨‚àûC to 1530¬¨‚àûC | |
| 296. |
_ Steel with __________ carbon is known as hypo-eutectoid steel.$? |
| A. | 0.8% |
| B. | Below 0.8% |
| C. | Above 0.8% |
| D. | None of these |
| Answer» C. Above 0.8% | |
| 297. |
_ The percentage carbon content in wrought iron is about$? |
| A. | 0.02 |
| B. | 0.1 |
| C. | 02 |
| D. | 0.4 |
| Answer» B. 0.1 | |
| 298. |
_ Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?$? |
| A. | Sulphur |
| B. | Phosphorus |
| C. | Manganese |
| D. | Silicon |
| Answer» D. Silicon | |
| 299. |
_ A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as$? |
| A. | Allotropic change |
| B. | Recrystallization |
| C. | Heat treatment |
| D. | Precipitation |
| Answer» B. Recrystallization | |
| 300. |
_ Points of arrest for iron correspond to$? |
| A. | Stages at which allotropic forms change |
| B. | Stages at which further heating does not increase temperature for some time |
| C. | Stages at which properties do not change with increase in temperature |
| D. | There is nothing like points of arrest |
| Answer» B. Stages at which further heating does not increase temperature for some time | |