MCQOPTIONS
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MCQOPTIONS
This section includes 283 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Nodular cast iron is produced by adding ____ to the molten cast iron. |
| A. | nickel |
| B. | chromium |
| C. | copper |
| D. | magnesium |
| Answer» E. | |
| 252. |
Permalloy and Mumetal are examples of |
| A. | Silicon and Iron alloys |
| B. | Nickel and Iron alloys |
| C. | Cobalt and Iron alloys |
| D. | Permanent magnetic alloys |
| Answer» C. Cobalt and Iron alloys | |
| 253. |
How many space lattices does the Bravais lattices consist of? |
| A. | 3 |
| B. | 7 |
| C. | 9 |
| D. | 14 |
| Answer» E. | |
| 254. |
Consider the following pairs regarding plastics and their respective characteristics:1. Polycarbonate: Poor impact resistance2. PTFE: Low coefficient of friction3. Polypropylene: Excellent fatigue strengthWhich of the above pairs is/are correctly matched? |
| A. | 1 only |
| B. | 2 only |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» E. | |
| 255. |
In low carbon steels, presence of small quantities sulphur improves |
| A. | Weldability |
| B. | Formability |
| C. | Mechanability |
| D. | Hardenability |
| Answer» D. Hardenability | |
| 256. |
Of the various microstructures that may be produced for a given steel alloy, which among the following is the hardest form |
| A. | Martensite |
| B. | Pearlite |
| C. | Bainite |
| D. | Spheroidite |
| Answer» B. Pearlite | |
| 257. |
How many crystal systems are known till date? |
| A. | 7 |
| B. | 12 |
| C. | 6 |
| D. | 10 |
| Answer» B. 12 | |
| 258. |
Packing efficiency of Body Centred Cubic (BCC) crystal is |
| A. | 0.68 |
| B. | 0.74 |
| C. | 0.50 |
| D. | 0.65 |
| Answer» B. 0.74 | |
| 259. |
Materials, whose resistivity at very low temperature plunges from a finite value to zero and remains there upon further cooling, are known as |
| A. | Ferromagnetic materials |
| B. | High-energy hard magnetic materials |
| C. | Superconductors |
| D. | Ferrimagnetic materials |
| Answer» D. Ferrimagnetic materials | |
| 260. |
Choose the correct eutectic reaction in steal being cooled from liquid state |
| A. | Liquid \(\frac {4.3\%C}{738 ^oC}\) Austenite + Cementite |
| B. | Liquid \(\frac {4.3\%C}{1148^oC}\) Austenite + Cementite |
| C. | Liquid \(\frac {4.9\%C}{1148^oC}\) Austenite + Cementite |
| D. | Liquid \(\frac {4.9\%}{738 ^oC}\) Austenite + Cementite |
| Answer» C. Liquid \(\frac {4.9\%C}{1148^oC}\) Austenite + Cementite | |
| 261. |
An alloy of nickel and iron that is easily magnetise and demagnetised and can also be used in electrical equipment is: |
| A. | cunife |
| B. | permalloy |
| C. | supermalloy |
| D. | alnico |
| Answer» C. supermalloy | |
| 262. |
Fatigue resistance of materials can be improved by:1. Shot peening2. Polishing the surfaceWhich of the above is /are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 263. |
A point at which the extension of steel material is faster than the load increment is: |
| A. | Breaking point |
| B. | Yield point |
| C. | Ultimate stress point |
| D. | Plastic point |
| Answer» C. Ultimate stress point | |
| 264. |
Directions: The below item consists of two statements, one labelled as the 'Statement (I)' and the other as 'Statement (II)'. Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I): In ferroelectric materials, domains with permanent electric dipoles may be created that would align along the external electric field.Statement (II): Ferroelectric materials undergo phase transformation of symmetric to the asymmetric structure below a critical temperature.Codes: |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» D. Statement (I) is false but Statement (II) is true | |
| 265. |
Directions: The following items consist of two statements, one labeled as “Statement (I)' and the other as ‘Statement (II)’. You are to examine these two statements carefully and select the answers to these items using the code given below:Statement (I): The external surface of a crystal is an imperfection in itself as the atomic bonds do not extend beyond the surface.Statement (II): The external surfaces have surface energies that are related to the number of bonds broken at the surface. |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» C. Statement (I) is true but Statement (II) is false | |
| 266. |
Directions: Each of the following items consist of two statements, one labeled as ‘Statement (I)’ and the other as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the code given below:Statement (I): All substances except ferromagnetic materials which can form permanent magnets, exhibit magnetic effectsStatement (II): Their magnetic effect is due to the alignment of dipoles when subjected to an external electromagnetic field |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» B. Both Statement (I and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) | |
| 267. |
Gold, water, mercury comes under which classification of magnetic material? |
| A. | Paramagnetic |
| B. | Aeromagnetic |
| C. | Ferromagnetic |
| D. | Diamagnetic |
| Answer» E. | |
| 268. |
A metal has a lattice parameter of 2.9 Å, density of 7.87 g/cc, the atomic weight of 55.85 and Avogadro's number is 6.0238 × 1023. The number of atoms per unit cell will be nearly |
| A. | 1 |
| B. | 2 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 269. |
Match the crystal structure in Column A with the corresponding packing fractions in Column B of the tableColumn AColumn B1. Simple cubicP. 0.742. Hexagonal close-packedQ. 0683. Body-centered cubicR. 0.524. Face-centered cubic |
| A. | 1 - P, 2 - R, 3 - Q, 4- Q |
| B. | 1 - R, 2 - P, 3 - R, 4- Q |
| C. | 1 - R, 2 - P, 3 - Q, 4- P |
| D. | 1 - P, 2 - R, 3 - P, 4- Q |
| Answer» D. 1 - P, 2 - R, 3 - P, 4- Q | |
| 270. |
At room temperature α –iron contains a negligible amount of carbon, cementite contains 6.67% C and pearlite contains 0.8% C. Pearlite contains how much cementite? |
| A. | 8% |
| B. | 10% |
| C. | 12% |
| D. | 14% |
| Answer» D. 14% | |
| 271. |
Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): The size of a hydrogen balloon increases as it rises in the air.Statement (II): The material of the balloon can be easily stretched. |
| A. | Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true, but Statement (II) is false |
| D. | Statement (I) is flase, but Statement (II) is true |
| Answer» C. Statement (I) is true, but Statement (II) is false | |
| 272. |
Direction: The following item consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the code given below:Statement I: The electrical conductivity of a solid solution alloy drops off rapidly with increased alloy content.Statement II: A solid solution has a less regular structure than a pure metal. |
| A. | Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I |
| B. | Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I |
| C. | Statement I is true but Statement II is false |
| D. | Statement I is false but Statement II is true |
| Answer» B. Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I | |
| 273. |
If a steel is designated as C80, which of the following statement is correct for it? |
| A. | C ≡ plain carbon steel, 80 ≡ 80% Iron |
| B. | C ≡ plain carbon steel, 80 ≡ 0.8% carbon |
| C. | C ≡ tool steel, 80 ≡ 0.8% carbon |
| D. | C ≡ tool steel, 80 ≡ 80% Iron |
| Answer» C. C ≡ tool steel, 80 ≡ 0.8% carbon | |
| 274. |
Creep plays an important role in the design of which of the followings? |
| A. | boiler tubings |
| B. | I. C. Engine cylinders |
| C. | Gas turbine blades |
| D. | Steam turbine blades |
| Answer» D. Steam turbine blades | |
| 275. |
Martensite forms during quenching, when the face centered cubic lattice of austenite is distorted into the ______ structure. |
| A. | Body-Centered Tetragonal |
| B. | Face-Centered Cubic |
| C. | Hexagonal Close Packed |
| D. | Rhombohedral Crystal |
| Answer» B. Face-Centered Cubic | |
| 276. |
Ball bearings are generally made up of |
| A. | carbon steel |
| B. | carbon chrome steel |
| C. | stainless steel |
| D. | grey cast iron |
| Answer» C. stainless steel | |
| 277. |
Consider the following statements: In a binary phase diagram1) The freezing point of the alloy is minimum.2) eutectic mixture solidifies at a constant temperature like pure metal3) eutectic reaction is irreversible4) at eutectic temperature liquids of two metal will change into two solidsWhich of the above statements are correct? |
| A. | 1, 2 and 3 only |
| B. | 1, 3 and 4 only |
| C. | 1, 2 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» D. 1, 2, 3 and 4 | |
| 278. |
Carbon content of common HSS material ranges from |
| A. | 0.2% to 0.4% |
| B. | 0.4% to 0.6% |
| C. | 0.6% to 0.8% |
| D. | 0.8% to 1.0% |
| Answer» D. 0.8% to 1.0% | |
| 279. |
Chromium as an alloying element in alloy steel is used principally to |
| A. | Improve hardenability |
| B. | Improve mechanical properties at low temperature |
| C. | Improve mechanical properties at elevated temperature |
| D. | Improve the corrosion and oxidation resistance |
| Answer» E. | |
| 280. |
In the study of phase diagrams, the rule which helps to calculate the relative proportions of liquid and solid material present in the mixture at any given temperature is known as |
| A. | Hume-Rothery rule |
| B. | Lever rule |
| C. | Gibb’s phase rule |
| D. | Empirical rule |
| Answer» C. Gibb’s phase rule | |
| 281. |
…… iron is the magnetic allotrope of iron. |
| A. | α |
| B. | β |
| C. | γ |
| D. | δ |
| Answer» B. β | |
| 282. |
Copper has FCC structures its atomic radius is 1.28 Å and atomic mass is 63.5 the density of copper will be |
| A. | 8.9 × 103 kg/mm3 |
| B. | 8.9 × 103 kg/cm3 |
| C. | 8.9 × 103 kg/m3 |
| D. | 8.9 × 103 g/mm3 |
| Answer» D. 8.9 × 103 g/mm3 | |
| 283. |
In 18/8 steel, what is the percentage of chromium |
| A. | 18 |
| B. | 8 |
| C. | 1 |
| D. | 0 |
| Answer» B. 8 | |