MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Thermoplastic materials are those materials which |
| A. | Are formed into shape under heat and pressure and results in a permanently hard product |
| B. | Do not become hard with the application of heat and pressure and no chemical change occurs |
| C. | Are flexible and can withstand considerable wear under suitable conditions |
| D. | Are used as a friction lining for clutches and brakes |
| Answer» C. Are flexible and can withstand considerable wear under suitable conditions | |
| 252. |
Which of the following metal shrinks most from molten state to solid state? |
| A. | Cast iron |
| B. | Cast steel |
| C. | Brass |
| D. | Admiralty metal |
| Answer» E. | |
| 253. |
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of |
| A. | Mainly ferrite |
| B. | Mainly pearlite |
| C. | Ferrite and pearlite |
| D. | Pearlite and cementite |
| Answer» D. Pearlite and cementite | |
| 254. |
Eutectoid reaction occurs at |
| A. | 600°C |
| B. | 723°C |
| C. | 1147°C |
| D. | 1493°C |
| Answer» C. 1147°C | |
| 255. |
Which is false statement about annealing? Annealing is done to |
| A. | Relieve stresses |
| B. | Harden steel slightly |
| C. | Improve machining characteristic |
| D. | Soften material |
| Answer» C. Improve machining characteristic | |
| 256. |
Which of the following statements are true for annealing of steels? |
| A. | Steels are heated to 500 to 700°C |
| B. | Cooling is done slowly and steadily |
| C. | Internal stresses are relieved |
| D. | All of these |
| Answer» E. | |
| 257. |
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 | |
| 258. |
Depth of hardness of steel is increased by addition of |
| A. | Nickel |
| B. | Chromium |
| C. | Tungsten |
| D. | Vanadium |
| Answer» C. Tungsten | |
| 259. |
1841 high speed steel contains |
| A. | Vanadium 4%, chromium 18% and tungsten 1% |
| B. | Vanadium 1%, chromium 4% and tungsten 18% |
| C. | Vanadium 18%, chromium 1% and tungsten 4% |
| D. | None of the above |
| Answer» C. Vanadium 18%, chromium 1% and tungsten 4% | |
| 260. |
Tungsten in high speed steel provides |
| A. | Hot hardness |
| B. | Toughness |
| C. | Wear resistance |
| D. | Sharp cutting edge |
| Answer» B. Toughness | |
| 261. |
The cupola is used to manufacture |
| A. | Pig iron |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» C. Wrought iron | |
| 262. |
Manganese in steel increases its |
| A. | Tensile strength |
| B. | Hardness |
| C. | Ductility |
| D. | Fluidity |
| Answer» B. Hardness | |
| 263. |
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is |
| A. | Chromium |
| B. | Nickel |
| C. | Vanadium |
| D. | Cobalt |
| Answer» E. | |
| 264. |
Which of the following is the binding material in cemented carbides? |
| A. | Cobalt |
| B. | Nickel |
| C. | Vanadium |
| D. | Iron |
| Answer» B. Nickel | |
| 265. |
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. | |
| 266. |
Specify the sequence correctly |
| A. | Grain growth, recrystallization, stress relief |
| B. | Stress relief, grain growth, recrystallization |
| C. | Stress relief, recrystallization, grain growth |
| D. | Grain growth, stress relief, recrystallization |
| Answer» D. Grain growth, stress relief, recrystallization | |
| 267. |
The blade of a power saw is made of |
| A. | Boron steel |
| B. | High speed steel |
| C. | Stainless steel |
| D. | Malleable cast iron |
| Answer» C. Stainless steel | |
| 268. |
Recrystallization temperature is one |
| A. | At which crystals first start forming from molten metal when it is cooled |
| B. | At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated |
| C. | At which change of allotropic form takes place |
| D. | At which crystals grow bigger in size |
| Answer» C. At which change of allotropic form takes place | |
| 269. |
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 | |
| 270. |
When medium carbon steel is heated to coarsening temperature |
| A. | There is no change in grain size |
| B. | The average grain size is a minimum |
| C. | The grain size increases very rapidly |
| D. | The grain size first increases and then decreases very rapidly |
| Answer» D. The grain size first increases and then decreases very rapidly | |
| 271. |
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron. |
| A. | Cementite |
| B. | Free graphite |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 272. |
Which of the following material has nearly zero coefficient of expansion? |
| A. | Stainless steel |
| B. | High speed steel |
| C. | Invar |
| D. | Heat resisting steel |
| Answer» D. Heat resisting steel | |
| 273. |
Delta-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» E. | |
| 274. |
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°C to 1530°C | |
| 275. |
Constantan an alloy used in thermocouples is an alloy of |
| A. | Copper and tin |
| B. | Copper and zinc |
| C. | Copper and iron |
| D. | Copper and nickel |
| Answer» E. | |
| 276. |
Slow plastic deformation of metals under a constant stress is known as |
| A. | Creep |
| B. | Fatigue |
| C. | Endurance |
| D. | Plastic deformation |
| Answer» B. Fatigue | |
| 277. |
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 | |
| 278. |
A material is said to be allotropic, if it has |
| A. | Fixed structure at all temperatures |
| B. | Atoms distributed in random pattern |
| C. | Different crystal structures at different temperatures |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 279. |
Body centered cubic space lattice is found in |
| A. | Zinc, magnesium, cobalt, cadmium, antimony and bismuth |
| B. | Gamma iron, aluminium, copper, lead, silver and nickel |
| C. | Alpha iron, tungsten, chromium and molybdenum |
| D. | None of the above |
| Answer» D. None of the above | |
| 280. |
Closed packed hexagonal space lattice is found in |
| A. | Zinc, magnesium, cobalt, cadmium, antimony and bismuth |
| B. | Gamma-iron, aluminium, copper, lead, silver and nickel |
| C. | Alpha-iron, tungsten, chromium and molybdenum |
| D. | None of the above |
| Answer» B. Gamma-iron, aluminium, copper, lead, silver and nickel | |
| 281. |
In spheroidising process, the steel is |
| A. | Heated below the lower critical temperature and then cooled slowly |
| B. | Heated up to the lower critical temperature and then cooled in still air |
| C. | Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C |
| D. | None of the above |
| Answer» D. None of the above | |
| 282. |
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% | |
| 283. |
Tensile strength of steel can be safely increased by |
| A. | Adding carbon up to 2.8% |
| B. | Adding carbon up to 6.3% |
| C. | Adding carbon up to 0.83% |
| D. | Adding small quantities of copper |
| Answer» D. Adding small quantities of copper | |
| 284. |
The lower critical point for all steels is |
| A. | 600°C |
| B. | 700°C |
| C. | 723°C |
| D. | 913°C |
| Answer» D. 913°C | |
| 285. |
Age-hardening is related with |
| A. | Stainless steel |
| B. | Gun metal |
| C. | German silver |
| D. | Duralumin |
| Answer» E. | |
| 286. |
The percentage carbon content in wrought iron is about |
| A. | 0.02 |
| B. | 0.1 |
| C. | 02 |
| D. | 0.4 |
| Answer» B. 0.1 | |
| 287. |
Which of the following element results in presence of free graphite in C.I.? |
| A. | Carbon |
| B. | Sulphur |
| C. | Silicon |
| D. | Manganese |
| Answer» D. Manganese | |
| 288. |
The alloying element which can replace tungsten in high speed steels is |
| A. | Nickel |
| B. | Vanadium |
| C. | Cobalt |
| D. | Molybdenum |
| Answer» E. | |
| 289. |
Which of the following impurity in cast iron makes it hard and brittle? |
| A. | Silicon |
| B. | Sulphur |
| C. | Manganese |
| D. | Phosphorus |
| Answer» C. Manganese | |
| 290. |
The heat treatment process used for softening hardened steel is |
| A. | Carburising |
| B. | Normalizing |
| C. | Annealing |
| D. | Tempering |
| Answer» E. | |
| 291. |
In the lower part of the blast furnace (zone of fusion), the temperature is |
| A. | 400° to 700°C |
| B. | 800°C to 1000°C |
| C. | 1200°C to 1300°C |
| D. | 1500°C to 1700°C |
| Answer» D. 1500°C to 1700°C | |
| 292. |
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements? |
| A. | Babbitt metal |
| B. | Monel metal |
| C. | Nichrome |
| D. | Phosphor bronze |
| Answer» D. Phosphor bronze | |
| 293. |
The toughness of a material __________ when it is heated. |
| A. | Remain same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 294. |
Acidic solution is one which has pH value |
| A. | Greater than 7 |
| B. | Less than 7 |
| C. | Equal to 7 |
| D. | pH value has nothing to do with neutral solution |
| Answer» C. Equal to 7 | |
| 295. |
Neutral solution is one which has pH value |
| A. | Greater than 7 |
| B. | Less than 7 |
| C. | Equal to 7 |
| D. | pH value has nothing to do with neutral solution |
| Answer» D. pH value has nothing to do with neutral solution | |
| 296. |
The addition of which of the following improves machining of copper? |
| A. | Sulphur |
| B. | Vanadium |
| C. | Tin |
| D. | Zinc |
| Answer» B. Vanadium | |
| 297. |
Which of the following represents the allotropic forms of iron? |
| A. | Alpha iron, beta iron and gamma iron |
| B. | Alpha iron and beta iron |
| C. | Body centered cubic iron and face centered cubic iron |
| D. | Alpha iron, gamma from and delta iron |
| Answer» E. | |
| 298. |
Tungsten when added to steel __________ the critical temperature. |
| A. | Does not effect |
| B. | Lowers |
| C. | Raises |
| D. | None of these |
| Answer» D. None of these | |
| 299. |
The material in which the atoms are arranged chaotically, is called |
| A. | Amorphous material |
| B. | Mesomorphous material |
| C. | Crystalline material |
| D. | None of these |
| Answer» B. Mesomorphous material | |
| 300. |
Isotropic materials are those which have the same |
| A. | Elastic properties in all directions |
| B. | Stresses induced in all directions |
| C. | Thermal properties in all directions |
| D. | Electric and magnetic properties in all directions |
| Answer» B. Stresses induced in all directions | |