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.
| 201. |
Alumina is a |
| A. | Dielectric |
| B. | Ceramic |
| C. | Semiconductor |
| D. | Conductor |
| Answer» C. Semiconductor | |
| 202. |
In steels, the symbol indicating heat treatable plain carbon steel for springs is: |
| A. | CC |
| B. | CS |
| C. | C |
| D. | CE |
| Answer» C. C | |
| 203. |
Perforation in Aluminum plate occurs when it is connected with the Mild steel plate and exposed to the same environment. This phenomenon is explained by |
| A. | Galvanic corrosion |
| B. | Cold welding corrosion |
| C. | Crevice corrosion |
| D. | High temperature corrosion |
| Answer» B. Cold welding corrosion | |
| 204. |
Inconel contains: |
| A. | 65% nickel, 15% chromium, 30% 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. | |
| 205. |
Match the items in column 1 and column 2 and choose the correct combination.Column 1Column 2A - Resilience1 – Ability of the material to return to the original shape when load is removedB – Fatigue2 – Capacity of a material to absorb energy elasticallyC – Stiffness3 – Ability of material to absorb a certain amount of energy without failureD - Elasticity4 – Resistance of the material to elastic deformation 5 – Failure of material at loads less than that at normal conditions |
| A. | A - 2, B - 5, C - 3, D - 1 |
| B. | A - 3, B - 2, C - 1, D - 4 |
| C. | A - 3, B - 5, C - 4, D - 2 |
| D. | A - 2, B - 5, C - 4, D - 1 |
| Answer» E. | |
| 206. |
Carbon percentage present in iron more than 4.3% is termed as |
| A. | Hypo-eutectoid steel |
| B. | Hyper-eutectoid steel |
| C. | Hyper-eutectic CI |
| D. | Hypo-eutectic CI |
| Answer» D. Hypo-eutectic CI | |
| 207. |
A material shows spontaneous magnetization. This is due to1. Weiss molecular field.2. Cooperative effect among dipoles.3. Cooperative effect among domains.4. Absence of applied magnetic field. |
| A. | 1, 2, 3 and 4 |
| B. | 2, 3 and 4 only |
| C. | 1, 2 and 3 only |
| D. | 1, 2 and 4 only |
| Answer» D. 1, 2 and 4 only | |
| 208. |
Pure graphite contains |
| A. | 0% of carbon |
| B. | 2% of carbon |
| C. | 6.67% of carbon |
| D. | 100% of carbon |
| Answer» E. | |
| 209. |
In a triclinic unit cell |
| A. | α = β = γ = 90° |
| B. | α = β = 90°, γ = 120° |
| C. | α = β = 90° ≠ γ |
| D. | α ≠ β ≠ γ |
| Answer» E. | |
| 210. |
A binary alloy of Cu and Ni containing 20 wt% Ni at a particular temperature coexists with a solid phase of 26 wt% Ni and liquid phase of 16 wt% Ni. What is the weight ratio of the solid phase and the liquid phase? |
| A. | 1 : 1 |
| B. | 3 : 2 |
| C. | 2 : 3 |
| D. | 1 : 2 |
| Answer» D. 1 : 2 | |
| 211. |
Creep, a high temperature progressive deformation, occurs in _____ stages. |
| A. | Five |
| B. | Four |
| C. | Three |
| D. | Two |
| Answer» D. Two | |
| 212. |
In general, for a superconductor, which of the following statements is true? |
| A. | A superconductor is a perfect paramagnetic material with the magnetic susceptibility equals to positive unity |
| B. | A superconductor is a perfect diamagnetic material with the magnetic susceptibility equals to negative one |
| C. | A superconductor is a perfect ferromagnetic material with the magnetic equals to positive one |
| D. | A superconductor is a perfect piezoelectric material with the magnetic susceptibility equals to negative unity |
| Answer» C. A superconductor is a perfect ferromagnetic material with the magnetic equals to positive one | |
| 213. |
If steel is quenched in water, the structure obtained is known as |
| A. | Pearlite |
| B. | Sorbite |
| C. | Martensite |
| D. | Troosite |
| Answer» D. Troosite | |
| 214. |
For paramagnetic materials, the relative permeability is |
| A. | less than unity but magnetic susceptibility is relatively small and positive |
| B. | greater than unity and magnetic susceptibility is relatively small but positive |
| C. | equal to unity and magnetic susceptibility is large but positive |
| D. | less than unity but magnetic susceptibility is relatively large and positive |
| Answer» C. equal to unity and magnetic susceptibility is large but positive | |
| 215. |
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 anticorrosion properties |
| Answer» E. | |
| 216. |
Percentage elongation measured during tensile testing indicates ________. |
| A. | malleability |
| B. | creep |
| C. | ductility |
| D. | fatigue strength |
| Answer» D. fatigue strength | |
| 217. |
Knife line or hairline cracking is observed in |
| A. | Ferritic stainless steel |
| B. | Martensitic stainless steel |
| C. | Austenitic stainless steel |
| D. | Stabilized stainless steel |
| Answer» E. | |
| 218. |
Alumina doped with magnesia will have reduced thermal conductivity because its structure becomes |
| A. | Amorphous |
| B. | Free of pores |
| C. | Crystalline |
| D. | Mixture of crystalline and glass |
| Answer» B. Free of pores | |
| 219. |
Consider the following statements:1. Both ferromagnetic and ferrimagnetic materials have domain structures; each domain has randomly oriented magnetic moments when no external field is applied.2. Both ferromagnetic and ferrimagnetic materials make those domains that have a favourable orientation to the applied field grow in size.3. The net magnetic moment in ferromagnetic materials is higher than that in ferrimagnetic materials.4. The net magnetic moment in ferrimagnetic materials is higher than that in ferromagnetic material.Which of the above statements are correct? |
| A. | 1 and 4 only |
| B. | 1, 2 and 4 |
| C. | 2 and 4 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 220. |
Pipes of bicycle frames are made of __________ steel. |
| A. | cast |
| B. | hot rolled |
| C. | carbon chrome |
| D. | dead mild |
| Answer» D. dead mild | |
| 221. |
__________ will exhibit viscoelastic behaviour. |
| A. | Steel |
| B. | Diamond |
| C. | Organic polymers |
| D. | Neoprene |
| Answer» E. | |
| 222. |
Magnetic properties of ferrites result mainly from |
| A. | Polarization of electromagnetic waves |
| B. | Dielectric behaviour of ferrite |
| C. | Magnetic dipole moment associated with the electron spin |
| D. | External magnetic fields |
| Answer» D. External magnetic fields | |
| 223. |
Consider the following statements in connection with the phase diagrams:1. Phase diagrams of binary alloys change by the presence of other alloying elements.2. Tie-line construction and lever rule are used to determine the phase compositions.3. Time-temperature transformations can be studied with the help of phase diagramsWhich of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 3 only | |
| 224. |
Consider the following statements:1. Metal conductors have more R(resistance) at higher temperatures.2. Tungsten can be used as a resistance wire.3. A superconductive material is one that has practically zero resistance.Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 225. |
High speed steel contains carbon |
| A. | 0.15 to 0.3% |
| B. | 0.6 to 1.0% |
| C. | 4 to 6% |
| D. | 6 to 10% |
| Answer» C. 4 to 6% | |
| 226. |
High carbon steel carries carbon percentage of |
| 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. | |
| 227. |
An atomic packing factor (APF) for the BCC unit cell of hard spheres atoms will be |
| A. | 0.63 |
| B. | 0.68 |
| C. | 0.73 |
| D. | 0.78 |
| Answer» C. 0.73 | |
| 228. |
Pure silicon at zero K is: |
| A. | An intrinsic semiconductor |
| B. | An extrinsic semiconductor |
| C. | A metal |
| D. | An insulator |
| Answer» E. | |
| 229. |
Austenitic stainless steel contains |
| A. | 18% chromium and 8% nickel |
| B. | 8% chromium and 18% nickel |
| C. | 14% chromium and 0.35% carbon |
| D. | 14% nickel and 0.35% carbon |
| Answer» B. 8% chromium and 18% nickel | |
| 230. |
A semiconductor device made out of a material having very high temperature coefficient of resistance is |
| A. | Transistor |
| B. | Varistor |
| C. | Thyristor |
| D. | Thermistor |
| Answer» E. | |
| 231. |
Eutectoid composition of carbon steel at room temperature is known as |
| A. | pearlite |
| B. | ferrite |
| C. | cementite |
| D. | martensite |
| Answer» B. ferrite | |
| 232. |
Edge dislocation is a: |
| A. | Point imperfection |
| B. | Line imperfection |
| C. | Surface imperfection |
| D. | Volume imperfection |
| Answer» C. Surface imperfection | |
| 233. |
Co-ordination number of FCC crystal is |
| A. | 4 |
| B. | 8 |
| C. | 12 |
| D. | 16 |
| Answer» D. 16 | |
| 234. |
In an iron – carbon diagram, the percentage by weight of carbon at eutectoid composition is |
| A. | 1.12 |
| B. | 0.76 |
| C. | 0.24 |
| D. | 0.03 |
| Answer» C. 0.24 | |
| 235. |
Austenite is a solid solution of carbon in ____ iron. |
| A. | Alpha |
| B. | Beta |
| C. | Gamma |
| D. | Delta |
| Answer» D. Delta | |
| 236. |
Einstein relation is referred between |
| A. | the diffusion constant and the mobility |
| B. | the conduction and diffusion |
| C. | the conduction and diffusion voltages |
| D. | None of the above |
| Answer» B. the conduction and diffusion | |
| 237. |
On which of the following factors does hysteresis loss depend?1. Magnetic field intensity2. Frequency of the field3. Volume of material4. Neel temperature |
| A. | 1, 2 and 4 only |
| B. | 1, 3 and 4 only |
| C. | 2, 3 and 4 only |
| D. | 1, 2 and 3 only |
| Answer» E. | |
| 238. |
If the magnetic susceptibility of a material is 5, then its relative permeability is |
| A. | 0 |
| B. | 6 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 239. |
In the slice processing of an integrated circuit |
| A. | components are formed in the areas where silicon dioxide remains |
| B. | components are formed in the areas where silicon dioxide has been removed |
| C. | the diffusing elements diffuse through silicon dioxide |
| D. | only on diffusion process is used |
| Answer» C. the diffusing elements diffuse through silicon dioxide | |
| 240. |
Direction: It 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 codes given below:Statement (I): A large number of metals become superconducting below a temperature which is characteristic of the particular metal.Statement (II): Superconducting compounds and alloys should necessarily have components which are themselves superconducting |
| 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 and 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 | |
| 241. |
Gun metal which is used in Journal bearing contains |
| A. | 88% Cu, 10% Sn, 2% Zn |
| B. | 80% Cu, 10% Zn, 10% Al |
| C. | 85% Cu, 5% Mg, 10% Al |
| D. | 85% Cu, 5% Sn, 10% Pb |
| Answer» B. 80% Cu, 10% Zn, 10% Al | |
| 242. |
______ is defined as the ability of a material to resist deformation under action of an external load. |
| A. | Stiffness |
| B. | Brittleness |
| C. | Toughness |
| D. | Resilience |
| Answer» B. Brittleness | |
| 243. |
An electrically balanced atom has 30 protons in its nucleus and 2 electrons in its outermost shell. The materials made of such atom is |
| A. | a conductor |
| B. | an insulator |
| C. | a semiconductor |
| D. | a superconductor |
| Answer» B. an insulator | |
| 244. |
Hot short phenomenon occurs in steel because of excess amount of |
| A. | manganese |
| B. | sulphur |
| C. | silicon |
| D. | phosphorous |
| Answer» C. silicon | |
| 245. |
Blade of power saw is made from |
| A. | lead alloys |
| B. | aluminum alloys |
| C. | high-speed steel |
| D. | cast iron |
| Answer» D. cast iron | |
| 246. |
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): Manganese is always added to steels since it combines with the sulphur content to form manganese sulphide.Statement (II): If manganese is not added, iron sulphide which is not harmful to steel, would form. |
| 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 | |
| 247. |
______ is obtained by isothermal hardening operation. |
| A. | Cementite |
| B. | Sorbite |
| C. | Acicular troostite |
| D. | Bainite |
| Answer» D. Bainite | |
| 248. |
In the phase diagram shown in the figure, four samples of the same composition are heated to temperatures marked by a, b, c and d.At which temperature will a sample get solutionized the fastest? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 249. |
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): Cross-linked polymers may be synthesized in which side-branch chains are connected to the main ones.Statement (II): Linear polymers are those in which the repeat units are joined together end to end in single chains. |
| 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» E. | |
| 250. |
Identify the method by which steel is NOT classified. |
| A. | Based on chemical composition |
| B. | Based on notch toughness |
| C. | Manufacturing method |
| D. | Based on heat treatment |
| Answer» E. | |