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.
| 351. |
Which of the following is an amorphous material? |
| A. | Mica |
| B. | Silver |
| C. | Lead |
| D. | Glass |
| Answer» E. | |
| 352. |
The property of a material due to which it breaks with little permanent distortion, is called |
| A. | Brittleness |
| B. | Ductility |
| C. | Malleability |
| D. | Plasticity |
| Answer» B. Ductility | |
| 353. |
The metal suitable for bearings subjected to light loads, is |
| A. | Silicon bronze |
| B. | White metal |
| C. | Monel metal |
| D. | Phosphor bronze |
| Answer» E. | |
| 354. |
Which of the following property is desirable for materials used in tools and machines? |
| A. | Elasticity |
| B. | Plasticity |
| C. | Ductility |
| D. | Malleability |
| Answer» B. Plasticity | |
| 355. |
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 | |
| 356. |
The temperature required for full annealing in hypereutectoid steel is |
| A. | 30° C to 50° C above upper critical temperature |
| B. | 30° C to 50° C below upper critical temperature |
| C. | 30° C to 50° C above lower critical temperature |
| D. | 30° C to 50° C below lower critical temperature |
| Answer» D. 30° C to 50° C below lower critical temperature | |
| 357. |
In a hardening process, the hypo-eutectoid steel is |
| A. | Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air |
| B. | Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium |
| C. | Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace |
| D. | Heated below or closes to the lower critical temperature and then cooled slowly |
| Answer» C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace | |
| 358. |
In process annealing, the hypo eutectoid steel is |
| A. | Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air |
| B. | Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium |
| C. | Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace |
| D. | Heated below or closes to the lower critical temperature and then cooled slowly |
| Answer» E. | |
| 359. |
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 | |
| 360. |
Super conduction by metals is observed in the temperature range of |
| A. | Below 10°K |
| B. | Above 100°K |
| C. | Around 0°C |
| D. | Around 100°C |
| Answer» B. Above 100°K | |
| 361. |
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 | |
| 362. |
Process of Austempering results in |
| A. | Formation of bainite structure |
| B. | Carburised structure |
| C. | Martenistic structure |
| D. | Lamellar layers of carbide distributed throughout the structure |
| Answer» B. Carburised structure | |
| 363. |
Permalloy is a |
| A. | Kind of stainless steel |
| B. | None ferrous alloy |
| C. | Polymer |
| D. | Nickel and iron alloy having high permeability |
| Answer» E. | |
| 364. |
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion. |
| A. | Sulphur |
| B. | Phosphorus |
| C. | Manganese |
| D. | Silicon |
| Answer» C. Manganese | |
| 365. |
The alloying element which reduces the formation of iron sulphide in steel is |
| A. | Chromium |
| B. | Nickel |
| C. | Vanadium |
| D. | Manganese |
| Answer» E. | |
| 366. |
Steel made from phosphate iron is |
| A. | Brittle |
| B. | Hard |
| C. | Ductile |
| D. | Tough |
| Answer» B. Hard | |
| 367. |
An example of amorphous material is |
| A. | Zinc |
| B. | Lead |
| C. | Silver |
| D. | Glass |
| Answer» E. | |
| 368. |
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 | |
| 369. |
A material is known as allotropic or polymorphic if it |
| A. | Has a fixed structure under all conditions |
| B. | Exists in several crystal forms at different temperatures |
| C. | Responds to heat treatment |
| D. | Has its atoms distributed in a random pattern |
| Answer» C. Responds to heat treatment | |
| 370. |
Phosphor bronze contains |
| A. | 0.5% of phosphorous |
| B. | 1% phosphorous |
| C. | 2.5% phosphorous |
| D. | None of the above |
| Answer» E. | |
| 371. |
Which of the following metal is used for nuclear energy? |
| A. | Uranium |
| B. | Thorium |
| C. | Niobium |
| D. | All of these |
| Answer» E. | |
| 372. |
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as |
| A. | Eutectic cast irons |
| B. | Hypoeutectic cast irons |
| C. | Hypereutectic cast irons |
| D. | None of these |
| Answer» C. Hypereutectic cast irons | |
| 373. |
Grey cast iron has |
| A. | Carbon in the form of free graphite |
| B. | High tensile strength |
| C. | Low compressive strength |
| D. | All of these |
| Answer» B. High tensile strength | |
| 374. |
The property of a material essential for spring materials is |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 375. |
Balls for ball bearings are made of |
| A. | Cast iron |
| B. | Mild steel |
| C. | Stainless steel |
| D. | Carbon-chrome steel |
| Answer» E. | |
| 376. |
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 | |
| 377. |
The charge of the blast furnace consists of |
| A. | Calcined ore (8 parts), coke (4 parts) and limestone (1 part) |
| B. | Calcined ore (4 parts), coke (1 part) and limestone (8 parts) |
| C. | Calcined ore (1 part), coke (8 parts) and limestone (4 parts) |
| D. | Calcined ore, coke and limestone all in equal parts |
| Answer» B. Calcined ore (4 parts), coke (1 part) and limestone (8 parts) | |
| 378. |
The charge is fed into the blast furnace through the |
| A. | Stack |
| B. | Throat |
| C. | Bosh |
| D. | Tyres |
| Answer» C. Bosh | |
| 379. |
Which of the following pipes is least corrosion resistant? |
| A. | Brass |
| B. | Mild steel |
| C. | Cast iron |
| D. | Wrought iron |
| Answer» E. | |
| 380. |
A coarse grained steel |
| A. | Is less tough and has a greater tendency to distort during heat treatment |
| B. | Is more ductile and has a less tendency to distort during heat treatment |
| C. | Is less tough and has a less tendency to distort during heat treatment |
| D. | Is more ductile and has a greater tendency to distort during heat treatment |
| Answer» B. Is more ductile and has a less tendency to distort during heat treatment | |
| 381. |
A reversible change in the atomic structure of steel with corresponding change in the properties is known as |
| A. | Molecular change |
| B. | Physical change |
| C. | Allotropic change |
| D. | Solidus change |
| Answer» D. Solidus change | |
| 382. |
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 | |
| 383. |
Hardness of upper bainite (acicular structure) is about |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| Answer» C. RC 57 | |
| 384. |
The molecules in a solid move |
| A. | In a random manner |
| B. | In a haphazard way |
| C. | In circular motion |
| D. | Back and forth like tiny pendulums |
| Answer» E. | |
| 385. |
Cast iron is manufactured in |
| A. | Blast furnace |
| B. | Cupola |
| C. | Open hearth furnace |
| D. | Bessemer converter |
| Answer» C. Open hearth furnace | |
| 386. |
When the steel is normalized, its |
| A. | Yield point increases |
| B. | Ductility decreases |
| C. | Ultimate tensile strength increases |
| D. | All of these |
| Answer» E. | |
| 387. |
Wrought iron |
| A. | Is a ductile material |
| B. | Can be easily forged or welded |
| C. | Cannot stand sudden and excessive shocks |
| D. | All of these |
| Answer» E. | |
| 388. |
Y-alloy 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» C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium | |
| 389. |
Compressive strength of grey cast iron in tonnes/cm is of the order of |
| A. | 35 |
| B. | 57 |
| C. | 710 |
| D. | 1015 |
| Answer» C. 710 | |
| 390. |
Blast furnace is used to produce |
| A. | Pig iron |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» B. Cast iron | |
| 391. |
The silicon steel is widely used for |
| A. | Connecting rods |
| B. | Cutting tools |
| C. | Generators and transformers in the form of laminated cores |
| D. | Motor car crankshafts |
| Answer» D. Motor car crankshafts | |
| 392. |
The portion of the blast furnace below its widest cross-section is called |
| A. | Hearth |
| B. | Stack |
| C. | Bosh |
| D. | Throat |
| Answer» D. Throat | |
| 393. |
Steel contains |
| A. | 80% or more iron |
| B. | 50% or more iron |
| C. | Alloying elements like chromium, tungsten nickel and copper |
| D. | Elements like phosphorus, sulphur and silicon in varying quantities |
| Answer» C. Alloying elements like chromium, tungsten nickel and copper | |
| 394. |
A small percentage of boron is added to steel in order to |
| A. | Increase hardenability |
| B. | Reduce machinability |
| C. | Increase wear resistance |
| D. | Increase endurance strength |
| Answer» B. Reduce machinability | |
| 395. |
The following element can't impart high strength at elevated temperature |
| A. | Manganese |
| B. | Magnesium |
| C. | Nickel |
| D. | Silicon |
| Answer» C. Nickel | |
| 396. |
The elastic stress strain behavior of rubber is |
| A. | Linear |
| B. | Nonlinear |
| C. | Plastic |
| D. | No fixed relationship |
| Answer» C. Plastic | |
| 397. |
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 | |
| 398. |
Bronze is an alloy of |
| A. | Copper and zinc |
| B. | Copper and tin |
| C. | Copper, tin and zinc |
| D. | None of these |
| Answer» C. Copper, tin and zinc | |
| 399. |
For a particular material the Hall coefficient was found to be zero. The material is |
| A. | Insulator |
| B. | Metal |
| C. | Intrinsic semiconductor |
| D. | None of the above |
| Answer» C. Intrinsic semiconductor | |
| 400. |
A perfect conductor has |
| A. | Zero conductivity |
| B. | Unity conductivity |
| C. | Infinite conductivity |
| D. | None of the above |
| Answer» D. None of the above | |