MCQOPTIONS
Saved Bookmarks
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.
| 301. |
Cartridge brass can be |
| A. | Cold rolled into sheets |
| B. | Drawn into wires |
| C. | Formed into tube |
| D. | Any one of these |
| Answer» E. | |
| 302. |
Which is false statement about properties of aluminium? |
| A. | Modulus of elasticity is fairly low |
| B. | Wear resistance is very good |
| C. | Fatigue strength is not high |
| D. | Creep strength limits its use to fairly low temperatures |
| Answer» C. Fatigue strength is not high | |
| 303. |
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 | |
| 304. |
Inconel contains |
| A. | 65% nickel, 15% chromium and 20% iron |
| B. | 68% nickel, 29% copper and 3% other constituents |
| C. | 80% nickel and 20% chromium |
| D. | 80% nickel, 14% chromium and 6% iron |
| Answer» E. | |
| 305. |
Age hardening is related to |
| A. | Duralumin |
| B. | Brass |
| C. | Copper |
| D. | Silver |
| Answer» B. Brass | |
| 306. |
For a steel containing 0.8% carbon |
| A. | There is no critical point |
| B. | There is only one critical point |
| C. | There are two critical points |
| D. | There can be any number of critical points |
| Answer» C. There are two critical points | |
| 307. |
Corundum contains more than 95% |
| A. | Steel |
| B. | Al2O3 |
| C. | SiO2 |
| D. | MgO |
| Answer» C. SiO2 | |
| 308. |
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces |
| A. | White cast iron |
| B. | Nodular cast iron |
| C. | Malleable cast iron |
| D. | Alloy cast iron |
| Answer» E. | |
| 309. |
Stress relaxation is the phenomenon |
| A. | In which parts are not loaded |
| B. | In which stress remains constant on increasing load |
| C. | In which deformation tends to loosen the joint and produces a stress reduced |
| D. | Stress reduces on increasing load |
| Answer» D. Stress reduces on increasing load | |
| 310. |
Smelting is the process of |
| A. | Removing the impurities like clay, sand etc. from the iron ore by washing with water |
| B. | Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns |
| C. | Reducing the ore with carbon in the presence of a flux |
| D. | All of the above |
| Answer» D. All of the above | |
| 311. |
The aluminium alloy, mainly used, for anodized utensil manufacture, is |
| A. | Duralumin |
| B. | Y-alloy |
| C. | Magnalium |
| D. | Hindalium |
| Answer» E. | |
| 312. |
Chilled cast iron has |
| A. | No graphite |
| B. | A very high percentage of graphite |
| C. | A low percentage of graphite |
| D. | Graphite as its basic constituent of composition |
| Answer» B. A very high percentage of graphite | |
| 313. |
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. | |
| 314. |
Which is the false statement about wrought iron? It has |
| A. | High resistance to rusting and corrosion |
| B. | High ductility |
| C. | Ability of hold protective coating |
| D. | Uniform strength in all directions |
| Answer» E. | |
| 315. |
Gun metal contains |
| A. | 70% copper and 30% zinc |
| B. | 90% copper and 10% tin |
| C. | 85 - 92% copper and rest tin with little lead and nickel |
| D. | 70 - 78% copper and rest tin |
| Answer» D. 70 - 78% copper and rest tin | |
| 316. |
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called |
| A. | Coordination number |
| B. | Atomic packing factor |
| C. | Space lattice |
| D. | None of these |
| Answer» C. Space lattice | |
| 317. |
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 318. |
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. | |
| 319. |
The hardness is the property of a material due to which it |
| A. | Can be drawn into wires |
| B. | Breaks with little permanent distortion |
| C. | Can cut another metal |
| D. | Can be rolled or hammered into thin sheets |
| Answer» D. Can be rolled or hammered into thin sheets | |
| 320. |
Solder is an alloy consisting of |
| A. | Tin, antimony, copper |
| B. | Tin and copper |
| C. | Tin and lead |
| D. | Lead and zinc |
| Answer» C. Tin and lead | |
| 321. |
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% | |
| 322. |
The material widely used for making pendulums of clocks is |
| A. | Stainless steel |
| B. | High speed steel |
| C. | Heat resisting steel |
| D. | Nickel steel |
| Answer» E. | |
| 323. |
Dye penetrant method is generally used to locate |
| A. | Core defects |
| B. | Surface defects |
| C. | Superficial defects |
| D. | Temporary defects |
| Answer» C. Superficial defects | |
| 324. |
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | First increase and then decrease |
| Answer» B. Decrease | |
| 325. |
Aluminium bronze contains |
| A. | 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe |
| B. | 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg |
| C. | 10% aluminium and 90% copper |
| D. | 90% magnesium and 9% aluminium with some copper |
| Answer» D. 90% magnesium and 9% aluminium with some copper | |
| 326. |
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 | |
| 327. |
The hardness of steel primarily depends on |
| A. | Percentage of carbon |
| B. | Percentage of alloying elements |
| C. | Heat treatment employed |
| D. | Shape of carbides and their distribution in iron |
| Answer» E. | |
| 328. |
Nodular cast iron is produced by adding ________ to the molten cast iron. |
| A. | Nickel |
| B. | Chromium |
| C. | Copper |
| D. | Magnesium |
| Answer» E. | |
| 329. |
The machinability of steel is improved by adding |
| A. | Nickel |
| B. | Chromium |
| C. | Nickel and chromium |
| D. | Sulphur, lead and phosphorus |
| Answer» E. | |
| 330. |
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 | |
| 331. |
The hardness and tensile strength in austenitic stainless steel can be increased by |
| A. | Hardening and cold working |
| B. | Normalizing |
| C. | Martempering |
| D. | Full annealing |
| Answer» B. Normalizing | |
| 332. |
The presence of hydrogen in steel causes |
| A. | Reduced neutron absorption cross-section |
| B. | Improved Weldability |
| C. | Embrittlement |
| D. | Corrosion resistance |
| Answer» D. Corrosion resistance | |
| 333. |
The brown smoke during the operation of a Bessemer converter indicates that the |
| A. | Air is burning out silicon and manganese |
| B. | Silicon and manganese has burnt and carbon has started oxidizing |
| C. | The converter must be titled to remove the contents of the converter |
| D. | The brown smoke does not occur during the operation of a Bessemer converter |
| Answer» B. Silicon and manganese has burnt and carbon has started oxidizing | |
| 334. |
The property of a material which enables it to retain the deformation permanently, is called |
| A. | Brittleness |
| B. | Ductility |
| C. | Malleability |
| D. | Plasticity |
| Answer» E. | |
| 335. |
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. | |
| 336. |
Induction hardening is basically a |
| A. | Carburising process |
| B. | Surface hardening process |
| C. | Core hardening process |
| D. | None of these |
| Answer» C. Core hardening process | |
| 337. |
The main alloying elements high speed steel in order of increasing proportion are |
| A. | Vanadium, chromium, tungsten |
| B. | Tungsten, titanium, vanadium |
| C. | Chromium, titanium, vanadium |
| D. | Tungsten, chromium, titanium |
| Answer» B. Tungsten, titanium, vanadium | |
| 338. |
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 | |
| 339. |
Combined carbon in iron makes the metal |
| A. | Soft and gives 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» E. | |
| 340. |
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% | |
| 341. |
German silver contains |
| A. | 1% silver |
| B. | 2% silver |
| C. | 5% silver |
| D. | No silver |
| Answer» E. | |
| 342. |
Iron ore is usually found in the form of |
| A. | Oxides |
| B. | Carbonates |
| C. | Sulphides |
| D. | All of these |
| Answer» E. | |
| 343. |
Nodular iron has |
| A. | High machinability |
| B. | Low melting point |
| C. | High tensile strength |
| D. | All of the above |
| Answer» E. | |
| 344. |
In grey cast iron, carbon is present in the form of |
| A. | Cementite |
| B. | Free carbon |
| C. | Flakes |
| D. | Spheroids |
| Answer» D. Spheroids | |
| 345. |
Hematite iron ore contains iron about |
| A. | 30% |
| B. | 45% |
| C. | 55% |
| D. | 70% |
| Answer» E. | |
| 346. |
For the allotropic forms of iron, the points of arrest are |
| A. | The points where no further change occurs |
| B. | Constant for all metals |
| C. | The points where there is no further flow of metal |
| D. | The points of discontinuity |
| Answer» E. | |
| 347. |
Nickel when added to copper improves |
| A. | Machinability |
| B. | Hardness |
| C. | Hardness and strength |
| D. | Strength and ductility |
| Answer» C. Hardness and strength | |
| 348. |
Silicon when added to copper improves |
| A. | Machinability |
| B. | Hardness |
| C. | Hardness and strength |
| D. | Strength and ductility |
| Answer» D. Strength and ductility | |
| 349. |
The metal suitable for bearings subjected to heavy loads, is |
| A. | Silicon bronze |
| B. | White metal |
| C. | Monel metal |
| D. | Phosphor bronze |
| Answer» C. Monel metal | |
| 350. |
Which of the following is used for bearing liner? |
| A. | Gun metal |
| B. | Bronze |
| C. | Bell metal |
| D. | Babbitt metal |
| Answer» E. | |