MCQOPTIONS
Saved Bookmarks
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.
| 351. |
_When low carbon steel is heated up to lower critical temperature$? |
| A. | There is no change in grain size |
| B. | The average grain size is a minimum |
| C. | The grain size increases very rapidly |
| D. | The grain size first increases and then decreases very rapidly |
| Answer» B. The average grain size is a minimum | |
| 352. |
_Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?$? |
| A. | Silicon |
| B. | Sulphur |
| C. | Manganese |
| D. | Phosphorus |
| Answer» B. Sulphur | |
| 353. |
_Specify the sequence correctly$? |
| A. | Grain growth, recrystallization, stress relief |
| B. | Stress relief, grain growth, recrystallization |
| C. | Stress relief, recrystallization, grain growth |
| D. | Grain growth, stress relief, recrystallization |
| Answer» D. Grain growth, stress relief, recrystallization | |
| 354. |
_The hardness of steel increases if it contains$? |
| A. | Austenite |
| B. | Martensite |
| C. | Pearlite |
| D. | Cementite |
| Answer» C. Pearlite | |
| 355. |
_Basic constituents of Monel metal are$? |
| A. | Nickel, copper |
| B. | Nickel, molybdenum |
| C. | Zinc, tin, lead |
| D. | Nickel, lead and tin |
| Answer» B. Nickel, molybdenum | |
| 356. |
_Which of the following element results in presence of free graphite in C.I.?$? |
| A. | Carbon |
| B. | Sulphur |
| C. | Silicon |
| D. | Manganese |
| Answer» D. Manganese | |
| 357. |
_When medium carbon steel is heated to coarsening temperature$? |
| A. | There is no change in grain size |
| B. | The average grain size is a minimum |
| C. | The grain size increases very rapidly |
| D. | The grain size first increases and then decreases very rapidly |
| Answer» D. The grain size first increases and then decreases very rapidly | |
| 358. |
Hardness of upper bainite (acicular structure) is about$? |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| Answer» C. RC 57 | |
| 359. |
Which of the following pipes is least corrosion resistant?$? |
| A. | Brass |
| B. | Mild steel |
| C. | Cast iron |
| D. | Wrought iron |
| Answer» E. | |
| 360. |
Connecting rod is usually made of$? |
| A. | Aluminium |
| B. | Low carbon steel |
| C. | Medium carbon steel |
| D. | High carbon steel |
| Answer» D. High carbon steel | |
| 361. |
White cast iron$? |
| A. | Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron |
| B. | Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable |
| C. | Is produced by annealing process. It is soft, tough and easily machined metal |
| D. | Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material |
| Answer» C. Is produced by annealing process. It is soft, tough and easily machined metal | |
| 362. |
An eutectoid steel consists of$? |
| A. | Wholly pearlite |
| B. | Wholly austenite |
| C. | Pearlite and ferrite |
| D. | Pearlite and cementite |
| Answer» B. Wholly austenite | |
| 363. |
The heat treatment process used for softening hardened steel is$? |
| A. | Carburising |
| B. | Normalizing |
| C. | Annealing |
| D. | Tempering |
| Answer» E. | |
| 364. |
Neutral solution is one which has pH value$? |
| 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 | |
| 365. |
Tungsten when added to steel __________ the critical temperature.$? |
| A. | Does not effect |
| B. | Lowers |
| C. | Raises |
| D. | None of these |
| Answer» D. None of these | |
| 366. |
There are fourteen atoms in a unit cell of$? |
| A. | Body centered cubic space lattice |
| B. | Face centered cubic space lattice |
| C. | Close packed hexagonal space lattice |
| D. | None of these |
| Answer» C. Close packed hexagonal space lattice | |
| 367. |
Corundum contains more than 95%$? |
| A. | Steel |
| B. | Al2O3 |
| C. | SiO2 |
| D. | MgO |
| Answer» C. SiO2 | |
| 368. |
Cyaniding is the process of$? |
| A. | Dipping steel in cyanide bath |
| B. | Reacting steel surface with cyanide salts |
| C. | Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness |
| D. | Obtaining cyanide salts |
| Answer» D. Obtaining cyanide salts | |
| 369. |
White cast iron has$? |
| A. | Carbon in the form of carbide |
| B. | Low tensile strength |
| C. | High compressive strength |
| D. | All of these |
| Answer» E. | |
| 370. |
Which is false statement about normalizing? Normalizing is done to$? |
| A. | Refine grain structure |
| B. | Reduce segregation in casting |
| C. | Improve mechanical properties |
| D. | Induce stresses |
| Answer» E. | |
| 371. |
Which of the following is not the correct method of increasing fatigue limit?$? |
| A. | Shot peening |
| B. | Nitriding of surface |
| C. | Cold working |
| D. | Surface decarburisation |
| Answer» E. | |
| 372. |
Beryllium bronze contains$? |
| A. | 60% copper and 40% beryllium |
| B. | 80% copper and 20% beryllium |
| C. | 97.75% copper and 2.25% beryllium |
| D. | 99% copper and 1% beryllium |
| Answer» D. 99% copper and 1% beryllium | |
| 373. |
Addition of manganese to aluminium results in$? |
| A. | Improvement of casting characteristics |
| B. | Improvement of corrosion resistance |
| C. | One of the best known age and precipitation hardening systems |
| D. | Improving machinability |
| Answer» C. One of the best known age and precipitation hardening systems | |
| 374. |
Maximum percentage of carbon in austenite is$? |
| A. | 0.025% |
| B. | 0.26% |
| C. | 0.8% |
| D. | 1.7% |
| Answer» E. | |
| 375. |
Drop forging dies contain carbon of the order of$? |
| A. | 0.1 to 0.2% |
| B. | 0.25 to 0.5% |
| C. | 0.6 to 0.7% |
| D. | 0.7 to 0.9% |
| Answer» D. 0.7 to 0.9% | |
| 376. |
Pipes for bicycle frames are made of$? |
| A. | Cold rolled steel |
| B. | Hot rolled steel |
| C. | Forged steel |
| D. | Cast steel |
| Answer» B. Hot rolled steel | |
| 377. |
Sulphur in cast iron$? |
| A. | Makes the iron soft and easily machinable |
| B. | Increases hardness and brittleness |
| C. | Make the iron white and hard |
| D. | Aids fusibility and fluidity |
| Answer» C. Make the iron white and hard | |
| 378. |
Permalloy is a$? |
| A. | Kind of stainless steel |
| B. | None ferrous alloy |
| C. | Polymer |
| D. | Nickel and iron alloy having high permeability |
| Answer» E. | |
| 379. |
Nodular iron has$? |
| A. | High machinability |
| B. | Low melting point |
| C. | High tensile strength |
| D. | All of the above |
| Answer» E. | |
| 380. |
Gamma iron exits at following temperature$? |
| A. | Room temperature |
| B. | Near melting point |
| C. | Between 1400°C and 1539°C |
| D. | Between 910°C and 1400°C |
| Answer» E. | |
| 381. |
Which of the following is used for bearing liner?$? |
| A. | Gun metal |
| B. | Bronze |
| C. | Bell metal |
| D. | Babbitt metal |
| Answer» E. | |
| 382. |
Mild steel belongs to the following category$? |
| A. | Low carbon steel |
| B. | Medium carbon steel |
| C. | High carbon steel |
| D. | Alloy steel |
| Answer» B. Medium carbon steel | |
| 383. |
Nickel when added to copper improves$? |
| A. | Machinability |
| B. | Hardness |
| C. | Hardness and strength |
| D. | Strength and ductility |
| Answer» C. Hardness and strength | |
| 384. |
Pearlite consists of$? |
| 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» C. 13% ferrite and 87% cementite | |
| 385. |
Dye penetrant method is generally used to locate$? |
| A. | Core defects |
| B. | Surface defects |
| C. | Superficial defects |
| D. | Temporary defects |
| Answer» C. Superficial defects | |
| 386. |
Which of the following statement is correct?$? |
| A. | The product produced by blast-furnace is called cast iron |
| B. | The pig iron is the name given to the product produced by cupola |
| C. | The cast iron has high tensile strength |
| D. | The chilled cast iron has no graphite |
| Answer» E. | |
| 387. |
Manganese is added in low carbon steel to$? |
| A. | Make the steel tougher and harder |
| B. | Raise the yield point |
| C. | Make the steel ductile and of good bending qualities |
| D. | All of the above |
| Answer» D. All of the above | |
| 388. |
Ductility of a material can be defined as$? |
| A. | Ability to undergo large permanent deformations in compression |
| B. | Ability to recover its original form |
| C. | Ability to undergo large permanent deformations in tension |
| D. | All of the above |
| Answer» D. All of the above | |
| 389. |
Which of the following statement is true about brittle fracture?$? |
| A. | High temperature and low strain rates favour brittle fracture |
| B. | Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture |
| C. | Brittle fracture is always preceded by noise |
| D. | Cup and cone formation is characteristic for brittle materials |
| Answer» C. Brittle fracture is always preceded by noise | |
| 390. |
Cast iron has$? |
| A. | High tensile strength |
| B. | Its elastic limit close to the ultimate breaking strength |
| C. | High ductility |
| D. | All of the above |
| Answer» C. High ductility | |
| 391. |
The ability of a material to resist softening at high temperature is known as$? |
| A. | Creep |
| B. | Hot tempering |
| C. | Hot hardness |
| D. | Fatigue |
| Answer» D. Fatigue | |
| 392. |
In malleable iron, carbon is present in the form of$? |
| A. | Cementite |
| B. | Free carbon |
| C. | Flakes |
| D. | Nodular aggregates of graphite |
| Answer» E. | |
| 393. |
Pearlite consists 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» C. 13% ferrite and 87% cementite | |
| 394. |
Dye penetrant method is generally used to locate? |
| A. | Core defects |
| B. | Surface defects |
| C. | Superficial defects |
| D. | Temporary defects |
| Answer» C. Superficial defects | |
| 395. |
Manganese is added in low carbon steel to? |
| A. | Make the steel tougher and harder |
| B. | Raise the yield point |
| C. | Make the steel ductile and of good bending qualities |
| D. | All of the above |
| Answer» D. All of the above | |
| 396. |
Ductility of a material can be defined as? |
| A. | Ability to undergo large permanent deformations in compression |
| B. | Ability to recover its original form |
| C. | Ability to undergo large permanent deformations in tension |
| D. | All of the above |
| Answer» D. All of the above | |
| 397. |
Which of the following statement is true about brittle fracture?? |
| A. | High temperature and low strain rates favour brittle fracture |
| B. | Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture |
| C. | Brittle fracture is always preceded by noise |
| D. | Cup and cone formation is characteristic for brittle materials |
| Answer» C. Brittle fracture is always preceded by noise | |
| 398. |
Cast iron has? |
| A. | High tensile strength |
| B. | Its elastic limit close to the ultimate breaking strength |
| C. | High ductility |
| D. | All of the above |
| Answer» C. High ductility | |
| 399. |
The ability of a material to resist softening at high temperature is known as? |
| A. | Creep |
| B. | Hot tempering |
| C. | Hot hardness |
| D. | Fatigue |
| Answer» D. Fatigue | |
| 400. |
Which of the following statement is wrong?? |
| A. | Steel with 0.8% carbon is wholly pearlite |
| B. | The amount of cementite increases with the increase in percentage of carbon in iron |
| C. | A mechanical mixture of 87% cementite and 13% ferrite is called pearlite |
| D. | The cementite is identified as round particles in the structure |
| Answer» D. The cementite is identified as round particles in the structure | |