McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 201. |
X-rays cannot penetrate through |
| A. | Wood |
| B. | Brass |
| C. | Paper |
| D. | Lead |
| E. | Copper |
| Answer» D. Lead | |
| 202. |
In Brinell hardness testing the time of loading is |
| A. | 5 minutes |
| B. | 1 minute |
| C. | 15 seconds |
| D. | 30 seconds |
| E. | 10 minutes |
| Answer» C. 15 seconds | |
| 203. |
The property of material by which it can be rolled into sheets is called |
| A. | Elasticity |
| B. | Creep |
| C. | Ductility |
| D. | Malleability |
| E. | Plasticity |
| Answer» D. Malleability | |
| 204. |
Which is amorphous material out of the following? |
| A. | Brass |
| B. | Zinc |
| C. | Lead |
| D. | Silver |
| E. | Glass |
| Answer» E. Glass | |
| 205. |
The greatest amount of strain energy per unit volume that a material can absorb sithout exceeding its elastic limit is |
| A. | Endurance limit |
| B. | Proof resilience |
| C. | Resilience |
| D. | Toughness |
| E. | Elastic limit |
| Answer» D. Toughness | |
| 206. |
The fatigue limit of a shaft connot be increased by |
| A. | Cold working |
| B. | Nitriding of the surface |
| C. | Shot peening |
| D. | Surface decarburisation |
| E. | Under stressing |
| Answer» D. Surface decarburisation | |
| 207. |
A composite bar of steel and copper is heated. The copper bar will be under |
| A. | compression |
| B. | tension |
| C. | torsion |
| D. | shear |
| E. | None of the above |
| Answer» A. compression | |
| 208. |
Hot hardness of high speed steels increases due to the addition of |
| A. | Tungsten |
| B. | Phosphorous |
| C. | Chromium |
| D. | Vanadium |
| E. | None of the above |
| Answer» A. Tungsten | |
| 209. |
Coal used in a cupola is |
| A. | Charcoal |
| B. | Coking coal |
| C. | Pulverized coal |
| D. | Graphite |
| E. | Coke |
| Answer» E. Coke | |
| 210. |
In cold working of metals |
| A. | Poor surface finish is obtained |
| B. | Strength and hardness of steel is increased |
| C. | Close dimensional tolerance cannot be maintained |
| D. | Grain structure remains unchanged |
| E. | Recrystallization temperature for steel is reduced |
| Answer» B. Strength and hardness of steel is increased | |
| 211. |
Number of isotopes for iron is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| E. | Nil |
| Answer» C. 4 | |
| 212. |
A ductile fracture is usually not preceded by |
| A. | plastic flow |
| B. | deformation |
| C. | noise |
| D. | large amounts of non-recoverable energy absorption |
| E. | None of the above |
| Answer» C. noise | |
| 213. |
In high speed steel the maximum percentage of any alloying element is |
| A. | Chromium |
| B. | Carbon |
| C. | Tungsten |
| D. | Molybdenum |
| E. | Vanadium |
| Answer» C. Tungsten | |
| 214. |
Cemented carbide tools are generally not used for the machining of |
| A. | Cast iron |
| B. | Aluminium |
| C. | Bronze |
| D. | Brass |
| E. | Steel |
| Answer» D. Brass | |
| 215. |
The structure of common glass is |
| A. | Amorphous |
| B. | Partially crystalline |
| C. | Fully crystalline |
| D. | None of the above |
| E. | Semi-conductors |
| Answer» A. Amorphous | |
| 216. |
The purpose of annealing is to |
| A. | Produce irregular microstructure |
| B. | Harden the surface |
| C. | Induce hardness |
| D. | Remove stresses |
| E. | Induce stresses |
| Answer» D. Remove stresses | |
| 217. |
The behaviour of visco-elastic materials is |
| A. | time dependent |
| B. | temperature dependent |
| C. | orientation dependent |
| D. | age-dependent |
| E. | None of the above |
| Answer» A. time dependent | |
| 218. |
What is the atomic or ionic characteristic that determines the elements of which the atom or iron is representative? |
| A. | The nuber of electrons |
| B. | The mass |
| C. | Vitrified clay |
| D. | The number of protons |
| E. | The number of neutrons |
| Answer» D. The number of protons | |
| 219. |
Which of the following increases when copper is hard drawn into wires? |
| A. | Diameter |
| B. | Cross-sectional area |
| C. | Resistivity |
| D. | Specific gravity |
| E. | None of the above |
| Answer» C. Resistivity | |
| 220. |
The number of elastic constants for a completely anisotropie elastic material which follows Hooke's law is |
| A. | 2 |
| B. | 21 |
| C. | 25 |
| D. | 3 |
| E. | 4 |
| Answer» B. 21 | |
| 221. |
Which of the following materials have maximum magnetic permeability? |
| A. | 4% silicon steel |
| B. | 13.40% |
| C. | Iron carbide |
| D. | Pure iron |
| E. | Gram oriented Si-Fe |
| Answer» E. Gram oriented Si-Fe | |
| 222. |
Monel metal is |
| A. | Aluminium Copper alloy |
| B. | Nickel-Chromium alloy |
| C. | Aluminium Silver alloy |
| D. | Copper Nickel alloy |
| E. | Chromium - Molybdenum alloy |
| Answer» E. Chromium - Molybdenum alloy | |
| 223. |
Copper sheets are manufactured by |
| A. | Sintering |
| B. | Deep drawing |
| C. | Drawing |
| D. | Extruding |
| E. | Rolling |
| Answer» E. Rolling | |
| 224. |
If steel is quenched in water, the structure obtained is |
| A. | Martensite |
| B. | Acicular |
| C. | Troosite |
| D. | Sorbite |
| E. | Pearlite |
| Answer» A. Martensite | |
| 225. |
Brinell and Vickers hardness values are practically identical upto a hardness of |
| A. | 300 |
| B. | 30 |
| C. | 100 |
| D. | 10 |
| E. | 600 |
| Answer» A. 300 | |
| 226. |
If a material has similar properties throughout its volume, it is said to be |
| A. | Homogeneous |
| B. | Uniform |
| C. | Isentropic |
| D. | Continuous |
| E. | Isotropic |
| Answer» A. Homogeneous | |
| 227. |
Which of the following material can withstand maximum shocks without failure? |
| A. | Malleable cast iron |
| B. | Pig iron |
| C. | Gray cast iron |
| D. | Chilled cast iron |
| E. | White cast iron |
| Answer» A. Malleable cast iron | |
| 228. |
Heavy water is obtained by |
| A. | Slow evaporation of water |
| B. | Low temperature, low pressure distillation |
| C. | Rapid evaporation of water |
| D. | Repeared purification |
| E. | Prolonged electrolysis of water |
| Answer» E. Prolonged electrolysis of water | |
| 229. |
Identify the incorrect statement |
| A. | Fatigue strength is seriously reduced by the introduction of a stress raiser such as a notch or hole |
| B. | A fatigue failure is particularly insidous, because it occurs without any warning |
| C. | Fatuge results in a brittle fracture with no gross deformation at the fracture |
| D. | As the roughness of surface increses the fatigue life of speoimen increases |
| E. | None of the above |
| Answer» D. As the roughness of surface increses the fatigue life of speoimen increases | |
| 230. |
Pipes for bicycle frames are made of |
| A. | Cold rolled steel |
| B. | Carbon chrome steel |
| C. | Stainless steel |
| D. | Cast iron |
| E. | Hot rolled steel |
| Answer» A. Cold rolled steel | |
| 231. |
When a Ge-crystal is doped with phosphorous atom, it becomes |
| A. | Photo sensitive |
| B. | N-type semi-conductor |
| C. | A ferite |
| D. | An insulator |
| E. | P-type semi-conductor |
| Answer» B. N-type semi-conductor | |
| 232. |
The graphite rods in a nuclear pile |
| A. | Furnish alpha beta particles |
| B. | Furnish alpha particles |
| C. | Furnish neutron to fission U235 |
| D. | Undergo combustion which triggers the fission reaction |
| E. | Convert fast moving neutrons into thermal neutrons |
| Answer» E. Convert fast moving neutrons into thermal neutrons | |
| 233. |
Bakelite is |
| A. | a semi-conductor |
| B. | uncombustible |
| C. | a low resistance conducted |
| D. | a polarised insulator |
| E. | None of the above |
| Answer» B. uncombustible | |
| 234. |
The material which undergo recoverable deformation and exhibit rubber like elsticity are called |
| A. | Pure elastic materials |
| B. | Elastomers |
| C. | Rubbers |
| D. | Creep-elastic |
| E. | None of the above |
| Answer» B. Elastomers | |
| 235. |
Cold worked components are generally subjected to |
| A. | Annealing |
| B. | Hardening |
| C. | Shot peening |
| D. | Tempering |
| E. | Sherodising |
| Answer» A. Annealing | |
| 236. |
Figure of merit is used to |
| A. | compare the efficiency of chermoelectric materials |
| B. | measure the extent of doping of intrinsic semi-conductors |
| C. | compare the extent of purity of semi-seonuctor materials |
| D. | None of the above |
| E. | None of the above |
| Answer» A. compare the efficiency of chermoelectric materials | |
| 237. |
An elastic behaviour of materials is expressed in terms of |
| A. | Hysteresis loop area |
| B. | Adiabatic time |
| C. | Relaxation time |
| D. | Isothermal time |
| E. | Stress strain curve |
| Answer» B. Adiabatic time | |
| 238. |
Metal spinning |
| A. | Is done on symmetrical articles |
| B. | Utilises point hard tools |
| C. | Is done on unsymmetrical articles |
| D. | Does not require dies |
| E. | Is done at low speeds |
| Answer» A. Is done on symmetrical articles | |
| 239. |
Trimming is a process associated with |
| A. | Machining of metals |
| B. | Press work |
| C. | Electro plating |
| D. | Polishing of metals |
| E. | Forging |
| Answer» E. Forging | |
| 240. |
The property by which a body returns to its original shape after the removal to the load is called |
| A. | Softness |
| B. | Plasticity |
| C. | Elasticity |
| D. | Ductility |
| E. | Malleability |
| Answer» C. Elasticity | |
| 241. |
The phenomenon of weld decay is found in |
| A. | Cast iron |
| B. | Bronze |
| C. | Brass |
| D. | Gun metal |
| E. | Stainless steel |
| Answer» E. Stainless steel | |
| 242. |
Which of the following is the major constituent of corundum? |
| A. | Carbon |
| B. | SiO2 |
| C. | Diamond |
| D. | MgCl2 |
| E. | Al2O3 |
| Answer» E. Al2O3 | |
| 243. |
Which of the following material has highest specific gravity? |
| A. | High carbon steel |
| B. | Copper |
| C. | Brass |
| D. | Lead |
| E. | Aluminium |
| Answer» D. Lead | |
| 244. |
The number of semi-conductors in periodic table is |
| A. | 3 |
| B. | 5 |
| C. | 7 |
| D. | 13 |
| E. | None of the above |
| Answer» D. 13 | |
| 245. |
The operation of cutting out flat areas to some desired shape and which is generally the first step in a series of operations is known as |
| A. | Lancing |
| B. | Coining |
| C. | Slitting |
| D. | Curling |
| E. | Blanking |
| Answer» E. Blanking | |
| 246. |
The material for wire drawing should have |
| A. | High hardness |
| B. | High melting point |
| C. | Low boiling point |
| D. | Stiffness |
| E. | High ductility |
| Answer» E. High ductility | |
| 247. |
Which one of the following is usually most ductile? |
| A. | Hexagonal close packed lattice |
| B. | Body centred cubic lattice |
| C. | Face centred cubic lattic |
| D. | Combination of (A) and (C) above |
| E. | None of the above |
| Answer» C. Face centred cubic lattic | |
| 248. |
The maximum hardenability of any steel depends on |
| A. | The carbon content |
| B. | The chemical composition |
| C. | The grain size |
| D. | The alloying elements present |
| E. | None of the above |
| Answer» A. The carbon content | |
| 249. |
In case of biaxial stress system when a member is subjected to tensile stresses in two perpendicular directions the maximum shear stress in case of mild steel occurs on a plane inclined at |
| A. | 22 |
| B. | 90? |
| C. | 30? |
| D. | 0? |
| E. | 45? |
| Answer» E. 45? | |
| 250. |
Steel may be manufactured by |
| A. | Bessemer process |
| B. | Open hearth process |
| C. | Cementation process |
| D. | Duplex process |
| E. | Any of the above |
| Answer» B. Open hearth process | |
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