McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
When the atomic magnetic moments are randomly oriented in a solid, its magnetic behaviour is termed as |
| A. | polycrystalline |
| B. | anti-ferromagnetic |
| C. | paramagnetic |
| D. | semi-magnetic |
| E. | None of the above |
| Answer» C. paramagnetic | |
| 152. |
Plastic are |
| A. | Good conductors of heat and bad conductors of electricity |
| B. | Good conductors of heat as well as electricity |
| C. | Bad conductors of heat and good conductors of electricity |
| D. | Bad conductors of heat as well as electricity |
| E. | Semi-conductors |
| Answer» D. Bad conductors of heat as well as electricity | |
| 153. |
Which of the following does not contain copper as one of the alloying elements? |
| A. | Monel metal |
| B. | Perminivar |
| C. | Nichrome |
| D. | Manganin |
| E. | All of the above |
| Answer» C. Nichrome | |
| 154. |
When the metals are severely deformed in a particular direction, as in rolling or forging (on a macro scale), the mechanical properties may be |
| A. | Anisotropic |
| B. | Identical |
| C. | Isotropic |
| D. | Uniform |
| E. | Non-uniform |
| Answer» A. Anisotropic | |
| 155. |
The product of blast furnace is known as |
| A. | High carbon steel |
| B. | Steel |
| C. | Pig iron |
| D. | Crude iron |
| E. | Cast iron |
| Answer» B. Steel | |
| 156. |
The defect responsible for the phenomenon of slip, by which most metals deform plastically, is known as |
| A. | Fracture |
| B. | Twinning |
| C. | Dislocation |
| D. | Strain hardening |
| E. | None of the above |
| Answer» C. Dislocation | |
| 157. |
In a 0.2% carbon steel which has been heated above the third critical temperature on cooling at the first critical point the austenite remaining in solution is transformed to new structure called |
| A. | Ferrite |
| B. | Cementite |
| C. | Austenite |
| D. | Ferrite |
| E. | Pearlite |
| Answer» E. Pearlite | |
| 158. |
Which material has the best damping capacity |
| A. | Cast iron |
| B. | Mild steel |
| C. | High speed steel |
| D. | Diamond |
| E. | Stainless steel |
| Answer» A. Cast iron | |
| 159. |
If a material recovers its original dimensions, when the load is removed, it is known as |
| A. | Elastic |
| B. | Soft |
| C. | Annealed |
| D. | Plastic |
| E. | Brittle |
| Answer» A. Elastic | |
| 160. |
In plain carbon steel as the percentage of carbon increases from 0.2% to 0.8% which of the following decreases? |
| A. | Brinell hardness number |
| B. | Tensile strength |
| C. | Percentage elongation |
| D. | All of the above |
| E. | None of the above |
| Answer» C. Percentage elongation | |
| 161. |
In press work the dies which combine two or more operations at one station are known as |
| A. | Progressive dies |
| B. | Die and punch |
| C. | Simple dies |
| D. | Compound dies |
| E. | Press |
| Answer» D. Compound dies | |
| 162. |
Spring steel sections are originally applied in |
| A. | Hardened condition |
| B. | Hardened and tempered condition |
| C. | Annealed condition |
| D. | Carburized condition |
| E. | None of the above |
| Answer» C. Annealed condition | |
| 163. |
Which of the following ray has least wavelength? |
| A. | Yellow light rays |
| B. | Ultraviolet rays |
| C. | X-rays |
| D. | Cosmic rays |
| E. | Infra-red rays |
| Answer» D. Cosmic rays | |
| 164. |
Cheek is |
| A. | Top surface of metal |
| B. | Physical property of metal |
| C. | Non-ferrous coating on materials |
| D. | Core of the welded joints in case of very thick material |
| E. | Intermediate flask between copes and drag |
| Answer» E. Intermediate flask between copes and drag | |
| 165. |
Which of the following is 'acceptor' impurity for semi-conductor? |
| A. | Arsenic |
| B. | Phosphorous |
| C. | Boron |
| D. | Antimony |
| E. | All of the above |
| Answer» C. Boron | |
| 166. |
The loss of strength in compression which occurs when there is a gain in strength in the tension due to overloading is |
| A. | Iso-strain |
| B. | Hysteresis |
| C. | Bounhinger effect |
| D. | Relaxation |
| E. | Hooke's effect |
| Answer» B. Hysteresis | |
| 167. |
Electronic structure of a material is generally studied by |
| A. | Mossbauer studies |
| B. | Microscope |
| C. | Naked eye |
| D. | X-ray and electron diffraction |
| E. | Spectroscope techniques |
| Answer» E. Spectroscope techniques | |
| 168. |
Steel castings |
| A. | Cannot withstand impact |
| B. | Are not weldable |
| C. | Are weldable |
| D. | Have poor endurance properties |
| E. | Can withstand impact |
| Answer» C. Are weldable | |
| 169. |
Cold shuts are |
| A. | Saturation of pores in bricks |
| B. | Saturation of pores in metals by subsituting materials different from parent materials |
| C. | Defects in castings due to two streams of metal which are too cold to fuse properly |
| D. | Forging defects due to improper heating of materials |
| E. | None of the above |
| Answer» C. Defects in castings due to two streams of metal which are too cold to fuse properly | |
| 170. |
The property of metal when the recovery after unloading is complete but not instantaneous is |
| A. | Plsticity |
| B. | Visco elasticity |
| C. | An elasticity |
| D. | Inelasticity |
| E. | Elasticity |
| Answer» C. An elasticity | |
| 171. |
Cast irons are generally specified by |
| A. | Hardness |
| B. | Carbon percentage |
| C. | Tensile strength |
| D. | Iron percentage |
| E. | Process of manufacture |
| Answer» C. Tensile strength | |
| 172. |
Identify the incorrect statement |
| A. | Hot working performed on the metals is in a plastic state |
| B. | Much greater pressures are needed for ot working than for cold working |
| C. | When material is cold worked the resulting change in material shape brings about marked changes in the grain structure |
| D. | Structural changes in cold working are grain fragmentation and lattice distortion |
| E. | Residual stresses are set up in cold working |
| Answer» B. Much greater pressures are needed for ot working than for cold working | |
| 173. |
Galvanizing is generally done on |
| A. | Low carbon steels |
| B. | Cast iron |
| C. | Non-ferrous metals |
| D. | Non-metallic substances |
| E. | None of the above |
| Answer» A. Low carbon steels | |
| 174. |
A Babitt is |
| A. | A cutectic of iron and iron phosphide |
| B. | A gadget for measuring volume |
| C. | A measure of magnetic induction produced in a material |
| D. | None of these |
| E. | Antimony bearing lead or tin alloy |
| Answer» A. A cutectic of iron and iron phosphide | |
| 175. |
Which of the following colour of light has the least wavelength? |
| A. | Violet |
| B. | Green |
| C. | Blue |
| D. | Orange |
| E. | Red |
| Answer» A. Violet | |
| 176. |
The process in which steel is heated 20? to 40?C below the lower critical temperature, held there for a prolonged period and then allowed to cool slowly in the furnace is known as |
| A. | Annealing |
| B. | Tempering |
| C. | Normalising |
| D. | Austempering |
| E. | Spheroidising |
| Answer» E. Spheroidising | |
| 177. |
The fine grained steel |
| A. | Are brittle |
| B. | Are lighter |
| C. | Are doctile |
| D. | Have more tendency to distort |
| E. | None of the above |
| Answer» C. Are doctile | |
| 178. |
An atom containing an odd number of electrons is said to be |
| A. | Hypermagnetic |
| B. | Paramgnetic |
| C. | Ferromagnetic |
| D. | Diamagnetic |
| E. | Dielectric |
| Answer» B. Paramgnetic | |
| 179. |
For heavy loads in aircraft bearings the material used with lead to reduce the risk of scizure is |
| A. | Silver |
| B. | Copper |
| C. | Iron |
| D. | Tin |
| E. | Zinc |
| Answer» A. Silver | |
| 180. |
The raw material for mini steel plants is |
| A. | Iron ore |
| B. | Pig iron |
| C. | Grey iron |
| D. | CI and steel scrap |
| E. | None of the above |
| Answer» D. CI and steel scrap | |
| 181. |
Which type of electron pair exists in a semi-conductor? |
| A. | Ionic |
| B. | Non-ionic |
| C. | Homopolr |
| D. | Hetropolar |
| E. | None of the above |
| Answer» C. Homopolr | |
| 182. |
A body which is permanently deformed is said to have undergone |
| A. | Elastic deformation |
| B. | Limit of elastic deformation |
| C. | Uniform deformation |
| D. | Non-uniform deformation |
| E. | None of the above |
| Answer» C. Uniform deformation | |
| 183. |
In Charpy impact test, the specimen is held as a |
| A. | cantilever |
| B. | simply supported beam |
| C. | fixed beam |
| D. | hinged beam |
| E. | None of the above |
| Answer» B. simply supported beam | |
| 184. |
Materials which lack permanent magnetic dipoles are called |
| A. | diamagnetic |
| B. | ferromagnetic |
| C. | semi-magnetic |
| D. | None of the above |
| E. | None of the above |
| Answer» A. diamagnetic | |
| 185. |
The consitituent which has a powerful softening effect on cast iron and its presence in cast iron reduces the ability of the iron to retain carbon in chemical combination, is |
| A. | Silicon |
| B. | Carbon |
| C. | Sulphur |
| D. | Aluminium |
| E. | Chromium |
| Answer» A. Silicon | |
| 186. |
Which of the following materials demonstrate viscoelastic behaviour? |
| A. | Rubber |
| B. | Glass |
| C. | Plastics |
| D. | Non-crystalline organic polymers |
| E. | All of the above |
| Answer» D. Non-crystalline organic polymers | |
| 187. |
Carbon steel is |
| A. | An alloy of carbon and iron with varying quantities of phosphorous |
| B. | An alloy of carbon and iron obtained by oxidising excessive carbon from cast iron |
| C. | An alloy of carbon and iron obtained by oxidising excessive carbon steel |
| D. | An alloy of carbon generally obtained by adding graphite to low carbon steels |
| E. | None of the above |
| Answer» A. An alloy of carbon and iron with varying quantities of phosphorous | |
| 188. |
A hydrogen atom has |
| A. | Two electrons |
| B. | No neutrons |
| C. | No protons |
| D. | One each electron, neutron and proton |
| E. | None of the above |
| Answer» B. No neutrons | |
| 189. |
Which one is different from the others in press work |
| A. | Tube forming |
| B. | Embossing |
| C. | Bulging |
| D. | Cupping |
| E. | Notching |
| Answer» E. Notching | |
| 190. |
Which of the following properties has lower value for copper as compared to aluminium? |
| A. | Specific gravity |
| B. | Melting point |
| C. | Electrical resistivity |
| D. | All of the above |
| E. | None of the above |
| Answer» C. Electrical resistivity | |
| 191. |
A bearing alloy should have |
| A. | High resistance to corrosion |
| B. | Capacity to withstand shocks and vibrations |
| C. | All above |
| D. | Low coefficient of friction |
| E. | High compressive strength |
| Answer» C. All above | |
| 192. |
When a loop composed of two dissimilar metals could be made to carry a continuous current simply by maintaining the two junctions at different temperatures, the above effect is known as |
| A. | Thomson effect |
| B. | Thompson effect |
| C. | Peltier effect |
| D. | Seeback effect |
| E. | None of the above |
| Answer» D. Seeback effect | |
| 193. |
All of the following are point defects EXCEPT |
| A. | vacancies |
| B. | dislocations |
| C. | interstitials |
| D. | isolated impurities |
| E. | None of the above |
| Answer» B. dislocations | |
| 194. |
The limiting load beyond which the material no longer behaves elastically is known is |
| A. | Breaking load |
| B. | Load bearing capacity |
| C. | Limiting load |
| D. | Plastic limit |
| E. | Elastic limit |
| Answer» E. Elastic limit | |
| 195. |
When elastic limit is reached |
| A. | Tensile strain decreases in proportion to stress |
| B. | Tensile strain increases in proportion to stress |
| C. | Tensile strain increases more quickly |
| D. | Tensile strain decreases more quickly |
| E. | None of the above |
| Answer» A. Tensile strain decreases in proportion to stress | |
| 196. |
In general, high cohesive forces are related to |
| A. | Large values of elastic constants |
| B. | Low melting point |
| C. | Large coefficients of thermal expansion |
| D. | Small value of elastic constants |
| E. | None of the above |
| Answer» A. Large values of elastic constants | |
| 197. |
Hardness may be defined as resistance to |
| A. | Local penetration |
| B. | Machining |
| C. | Wear |
| D. | Scratching |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 198. |
The theory of failure which gives fairly good results for the ductile materials is |
| A. | Hooke's law |
| B. | Maximum shear stress theory |
| C. | Maximum strain energy theory |
| D. | Maximum principal stress theory |
| E. | Maximum shear strain energy theory |
| Answer» E. Maximum shear strain energy theory | |
| 199. |
Which of the following factor has the least effect on the electrical conductivity of wires made of copper alloy? |
| A. | Temperature |
| B. | Alloying element |
| C. | Vitrified clay |
| D. | Method of forming the wire |
| E. | Intensity of any incident light |
| Answer» E. Intensity of any incident light | |
| 200. |
Thermoplastic and thermoset polymers differ in |
| A. | Glass transition temperature |
| B. | Thermal behaviour |
| C. | Mechanical behaviour |
| D. | All of the above |
| E. | Semi-conductors |
| Answer» B. Thermal behaviour | |
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