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.
| 201. |
In compression, a prism of brittle material will break |
| A. | By forming a bulge |
| B. | By shearing along oblique plane |
| C. | In direction perpendicular to application of load |
| D. | By crushing into thousands of pieces |
| Answer» C. In direction perpendicular to application of load | |
| 202. |
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is |
| A. | Silver metal |
| B. | Duralumin |
| C. | Hastelloy |
| D. | Invar |
| Answer» E. | |
| 203. |
Which of the following alloys does not have copper as one of the constituents? |
| A. | Delta metal |
| B. | Monel metal |
| C. | Constantan |
| D. | Nichrome |
| Answer» E. | |
| 204. |
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 | |
| 205. |
The unit cells |
| A. | Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal |
| B. | Have the same orientation and their similar faces are parallel |
| C. | May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice |
| D. | All of the above |
| Answer» E. | |
| 206. |
Crystal structure of a material is, generally, examined by |
| A. | Naked eye |
| B. | Optical microscope |
| C. | Metallurgical microscope |
| D. | X-ray techniques |
| Answer» E. | |
| 207. |
Which of the following property is desirable in parts subjected to shock and impact loads? |
| A. | Strength |
| B. | Stiffness |
| C. | Brittleness |
| D. | Toughness |
| Answer» E. | |
| 208. |
Which of the following constituents of steels is softest and least strong? |
| A. | Austenite |
| B. | Pearlite |
| C. | Ferrite |
| D. | Cementite |
| Answer» D. Cementite | |
| 209. |
The bond formed by transferring electrons from one atom to another is called |
| A. | Ionic bond |
| B. | Covalent bond |
| C. | Metallic bond |
| D. | None of these |
| Answer» B. Covalent bond | |
| 210. |
The steel widely used for motor car crankshafts is |
| A. | Nickel steel |
| B. | Chrome steel |
| C. | Nickel-chrome steel |
| D. | Silicon steel |
| Answer» C. Nickel-chrome steel | |
| 211. |
Which of the following elements does not impart hardness to steel? |
| A. | Copper |
| B. | Chromium |
| C. | Nickel |
| D. | Silicon |
| Answer» B. Chromium | |
| 212. |
The stiffness is the ability of a material to resist |
| A. | Deformation under stress |
| B. | Fracture due to high impact loads |
| C. | Externally applied forces with breakdown or yielding |
| D. | None of the above |
| Answer» B. Fracture due to high impact loads | |
| 213. |
The strength is the ability of a material to resist |
| A. | Deformation under stress |
| B. | Externally applied forces with breakdown or yielding |
| C. | Fracture due to high impact loads |
| D. | None of these |
| Answer» C. Fracture due to high impact loads | |
| 214. |
The defect which takes place due to imperfect packing of atoms during crystallization is known as |
| A. | Line defect |
| B. | Surface defect |
| C. | Point defect |
| D. | None of these |
| Answer» D. None of these | |
| 215. |
Which of the following material has maximum ductility? |
| A. | Mild steel |
| B. | Copper |
| C. | Nickel |
| D. | Aluminium |
| Answer» B. Copper | |
| 216. |
Maximum percentage of carbon in ferrite is |
| A. | 0.025% |
| B. | 0.06% |
| C. | 0.1% |
| D. | 0.25% |
| Answer» B. 0.06% | |
| 217. |
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. | |
| 218. |
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 | |
| 219. |
Muntz metal contains copper and zinc in the ratio of |
| A. | 50 : 50 |
| B. | 40 : 60 |
| C. | 60 : 40 |
| D. | 20 : 80 |
| Answer» D. 20 : 80 | |
| 220. |
The ability of a material to absorb energy in the plastic range is called |
| A. | Resilience |
| B. | Creep |
| C. | Fatigue strength |
| D. | Toughness |
| Answer» E. | |
| 221. |
Malleability 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» B. Ability to recover its original form | |
| 222. |
Recrystallization temperature can be lowered by |
| A. | Purification of metal |
| B. | Grain refinement |
| C. | Working at lower temperature |
| D. | All of the above |
| Answer» E. | |
| 223. |
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is |
| A. | 0.04% |
| B. | 0.35 to 0.45% |
| C. | 0.4 to 0.6% |
| D. | 0.6 to 0.8% |
| Answer» C. 0.4 to 0.6% | |
| 224. |
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. | |
| 225. |
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 | |
| 226. |
Cast iron is a |
| A. | Ductile material |
| B. | Malleable material |
| C. | Brittle material |
| D. | Tough material |
| Answer» D. Tough material | |
| 227. |
Eutectoid steel contains following percentage of carbon |
| A. | 0.02% |
| B. | 0.3% |
| C. | 0.63% |
| D. | 0.8% |
| Answer» E. | |
| 228. |
Cast iron is characterized by minimum of following percentage of carbon |
| A. | 0.2% |
| B. | 0.8% |
| C. | 1.3% |
| D. | 2% |
| Answer» E. | |
| 229. |
A cold chisel is made of |
| A. | Mild steel |
| B. | Cast iron |
| C. | H.S.S. |
| D. | High carbon |
| Answer» E. | |
| 230. |
Chromium in steel |
| A. | Improves wear resistance, cutting ability and toughness |
| B. | Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties |
| C. | Improves cutting ability and reduces hardenability |
| D. | Gives ductility, toughness, tensile strength and anti-corrosion properties |
| Answer» B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties | |
| 231. |
The electric process of steel making is especially adapted to |
| A. | Alloy and carbon tool steel |
| B. | Magnet steel |
| C. | High speed tool steel |
| D. | All of these |
| Answer» E. | |
| 232. |
Cobalt in steel |
| A. | Improves wear resistance, cutting ability and toughness |
| B. | Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties |
| C. | Improves cutting ability and reduce hardenability |
| D. | Gives ductility, toughness, tensile strength and anti corrosion property |
| Answer» D. Gives ductility, toughness, tensile strength and anti corrosion property | |
| 233. |
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 | |
| 234. |
Shock resistance of steel is increased by adding |
| A. | Nickel |
| B. | Chromium |
| C. | Nickel and chromium |
| D. | Sulphur, lead and phosphorus |
| Answer» D. Sulphur, lead and phosphorus | |
| 235. |
Which of the following has highest specific strength of all structural materials? |
| A. | Magnesium alloys |
| B. | Titanium alloys |
| C. | Chromium alloys |
| D. | Magnetic steel alloys |
| Answer» C. Chromium alloys | |
| 236. |
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is |
| A. | 770°C |
| B. | 910°C |
| C. | 1050°C |
| D. | Below recrystallization temperature |
| Answer» B. 910°C | |
| 237. |
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 | |
| 238. |
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 | |
| 239. |
When low carbon steel is heated up to upper 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» C. The grain size increases very rapidly | |
| 240. |
Which of the following display properties similar to that of steel? |
| A. | Blackheart cast iron |
| B. | Whiteheart cast iron |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 241. |
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 | |
| 242. |
In high speed steels, manganese is used to tougher the metal and to increase its |
| A. | Yield point |
| B. | Critical temperature |
| C. | Melting point |
| D. | Hardness |
| Answer» C. Melting point | |
| 243. |
The machinability of aluminium increases when _________ is added to aluminium. |
| A. | Copper |
| B. | Magnesium |
| C. | Silicon |
| D. | Lead and bismuth |
| Answer» E. | |
| 244. |
Which is false statement about case hardening? Case hardening is done by |
| A. | Electroplating |
| B. | Cyaniding |
| C. | Induction hardening |
| D. | Nitriding |
| Answer» B. Cyaniding | |
| 245. |
Quenching is not necessary when hardening is done by |
| A. | Case hardening |
| B. | Flame hardening |
| C. | Nitriding |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 246. |
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. | |
| 247. |
Steel containing ferrite and pearlite is |
| A. | Hard |
| B. | Soft |
| C. | Tough |
| D. | Hard and tough |
| Answer» C. Tough | |
| 248. |
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled |
| A. | In still air |
| B. | Slowly in the furnace |
| C. | Suddenly in a suitable cooling medium |
| D. | Any one of these |
| Answer» C. Suddenly in a suitable cooling medium | |
| 249. |
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. | |
| 250. |
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio |
| A. | 50 : 20 : 20 : 10 |
| B. | 40 : 30 : 20 : 10 |
| C. | 50 : 20 : 10 : 20 |
| D. | 30 : 20 : 30 : 20 |
| Answer» B. 40 : 30 : 20 : 10 | |