McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 301. |
The limitations of electroforming are |
| A. | Cost is high |
| B. | Production rate is generally very low |
| C. | Recesses can be easily formed |
| D. | (A) and (B) above |
| E. | (A) and (C) above |
| Answer» D. (A) and (B) above | |
| 302. |
Which of the following is the lightest? |
| A. | Neutron |
| B. | Molecule |
| C. | Atom |
| D. | Electron |
| E. | Proton |
| Answer» D. Electron | |
| 303. |
Cold shortness is |
| A. | Too much shrinkage of materials at low temperatures |
| B. | Uneven shrinkage of materials at low temperatures |
| C. | Brittleness of material at low temperature |
| D. | The region where Hooke's law does not hold good |
| E. | None of the above |
| Answer» D. The region where Hooke's law does not hold good | |
| 304. |
The process of shaping thin metals by pressing it against form while it is rotating is known as |
| A. | Pressing |
| B. | Extruding |
| C. | Bending |
| D. | Metal spinning |
| E. | Trimming |
| Answer» D. Metal spinning | |
| 305. |
Stress concentration occurs when |
| A. | A body is subjected to excessive stress |
| B. | A body is subjected to reversing stress |
| C. | A body is subjected to non-uniform stress distribution |
| D. | A body is subjected to fluctuating stress |
| E. | A body is subjected to unidirectional stress |
| Answer» C. A body is subjected to non-uniform stress distribution | |
| 306. |
Brinell hardness number of mild steel should expected to be in the range be |
| A. | 150-300 |
| B. | 110-150 |
| C. | 20--50 |
| D. | 300-450 |
| E. | 10-110 |
| Answer» B. 110-150 | |
| 307. |
DIN standards are used in |
| A. | India |
| B. | Britain |
| C. | France |
| D. | USSR |
| E. | Germany |
| Answer» E. Germany | |
| 308. |
The process of reheating hardened steel to temperature below the lower critical temperature followed by any desired rate of cooling, is known as |
| A. | Hardening |
| B. | Spheroidizing |
| C. | Annealing |
| D. | Tempering |
| E. | Normalizing |
| Answer» D. Tempering | |
| 309. |
Gamma iron exists at temperatures in the range |
| A. | Room temperature and lower critical temperature |
| B. | Between 1400?C and 1600?C |
| C. | Above 1600?C |
| D. | Between 500?C and 850?C |
| E. | Between 900?C and 1400?C |
| Answer» E. Between 900?C and 1400?C | |
| 310. |
Hardness of martensite is about |
| A. | RC 67 |
| B. | RC 65 |
| C. | RC 48 |
| D. | RC 89 |
| E. | RC 57 |
| Answer» B. RC 65 | |
| 311. |
Nitriding is a process for |
| A. | Annealing |
| B. | Spheroidizing |
| C. | Case hardening |
| D. | Normalizing |
| E. | None of the above |
| Answer» C. Case hardening | |
| 312. |
Polyethylene is produced by |
| A. | Condensation polymerization |
| B. | Addition polymerization |
| C. | Colpolymerization of ethylene monomers |
| D. | None of the above |
| E. | Semi-conductors |
| Answer» B. Addition polymerization | |
| 313. |
Which of the following rays are neither deflected by electric field nor by magnetic field? |
| A. | ?-rays |
| B. | ?-rays |
| C. | ?-rays |
| D. | X-rays |
| E. | None of the above |
| Answer» C. ?-rays | |
| 314. |
In drop forging the forging is done by |
| A. | Dropping the workpiece at high velocity |
| B. | Dropping the hammer at high velocity |
| C. | Dropping the die with hammer at high velocity |
| D. | Dropping a weight on hammer to produce requisite impact |
| E. | None of the above |
| Answer» C. Dropping the die with hammer at high velocity | |
| 315. |
The process of austempering results in the formation of |
| A. | Carburized structure |
| B. | Martensitic structure |
| C. | Nitride structure |
| D. | Bainite structure |
| E. | Superhand structure |
| Answer» D. Bainite structure | |
| 316. |
Which of the following materials can be used for temperatures upto 500?C? |
| A. | Empire cloth |
| B. | Paper oiled |
| C. | Mica |
| D. | Polythene |
| E. | None of the above |
| Answer» C. Mica | |
| 317. |
The resistivity of electrical conductors is most affected by |
| A. | Temperature |
| B. | Pressure or composition |
| C. | Composition |
| D. | Pressure |
| E. | Temperature and pressure |
| Answer» C. Composition | |
| 318. |
The process of adding impurity to a semi-conductor material is called |
| A. | Grouping |
| B. | Mixing |
| C. | Doping |
| D. | Binding |
| E. | Film deposition |
| Answer» C. Doping | |
| 319. |
Which of the following material can be used at temperatures above 100?C? |
| A. | Polythene |
| B. | Teflon |
| C. | Rubber |
| D. | Paraffin wax |
| E. | None of the above |
| Answer» B. Teflon | |
| 320. |
Which of the following method cannot be used for thermoplastic materials? |
| A. | Extrusion |
| B. | Blow moulding |
| C. | Injection moulding |
| D. | All of the above |
| E. | None of the above |
| Answer» B. Blow moulding | |
| 321. |
Identify the correct statement |
| A. | A metal which is brittle in tension at room temperature can become ductile in the presence of notches |
| B. | A metal which is brittle in tension t room presence of embrittlement agents such as hydrogen |
| C. | A metal which is ductile in tension at room temperature can become brittle in the presence of notches |
| D. | A metal which is ductile in tension at room temperature can become brittle under gradual rate of loading |
| E. | None of the above |
| Answer» C. A metal which is ductile in tension at room temperature can become brittle in the presence of notches | |
| 322. |
The process of heating iron base alloys to approzimately 40?C above the critical temperature range followed by cooling to below that range in still air at ordinary temperature is known as |
| A. | Normalizing |
| B. | Tempering |
| C. | Hardening |
| D. | Spheroidizing |
| E. | Annealing |
| Answer» A. Normalizing | |
| 323. |
Bainiti is a fine maxture of |
| A. | ferrite and cementite |
| B. | cementitie and peoitite |
| C. | pearlite and ferrite |
| D. | austenti and ferrite |
| E. | None of the above |
| Answer» A. ferrite and cementite | |
| 324. |
In inverse rate curve |
| A. | The ordainate is temperature |
| B. | The abscissa is time |
| C. | The abscissa is temperature |
| D. | The ordinate is time |
| E. | The abscissa is carbon percentage |
| Answer» A. The ordainate is temperature | |
| 325. |
In Brinell hardness tests if a soft ball is used for indentation |
| A. | The indentation will not eb circular |
| B. | It will not be possible to correctly measure the depth of indentation |
| C. | The surface of indentation will be rough |
| D. | The ball may deform |
| E. | None of the above |
| Answer» D. The ball may deform | |
| 326. |
High purity copper is obtained by |
| A. | casting |
| B. | rolling |
| C. | induction heating |
| D. | electric refining |
| E. | None of the above |
| Answer» D. electric refining | |
| 327. |
A solution of NaOH conducts electricity bcause NaOH is |
| A. | A dielectric |
| B. | A non-electrolyte |
| C. | A strong electrolyte |
| D. | A week electrolyte |
| E. | None of the above |
| Answer» C. A strong electrolyte | |
| 328. |
The process by which a steel ingot is converted into a sheet is known as |
| A. | Rolling process |
| B. | Routing process |
| C. | Re-rolling process |
| D. | Machining process |
| E. | Forging process |
| Answer» A. Rolling process | |
| 329. |
Eutectic is |
| A. | a phase transformation in which all the liquid phase transforms on cooling to two solid phases simultaneously |
| B. | A phase transformation which occurs above the glass transition temperature |
| C. | a solid solution of one component in another |
| D. | None of the above |
| E. | None of the above |
| Answer» A. a phase transformation in which all the liquid phase transforms on cooling to two solid phases simultaneously | |
| 330. |
One of the objects of annealing is |
| A. | To refine grain structure |
| B. | To soften the metal |
| C. | to improve machinability |
| D. | All above |
| E. | To refine internal stresses |
| Answer» D. All above | |
| 331. |
Silicon steel used for electrical purposes has silicon percentage of |
| A. | 3.40% |
| B. | 2.50% |
| C. | 13.40% |
| D. | 1.50% |
| E. | 0.50% |
| Answer» A. 3.40% | |
| 332. |
Which of the following method can be used for thermoplastic materials? |
| A. | Blow moulding |
| B. | Casting |
| C. | Calendering |
| D. | Compression moulding |
| E. | None of the above |
| Answer» C. Calendering | |
| 333. |
Which of the following polymer is crystalline? |
| A. | Semi-conductors |
| B. | Polyvinylidene chloride |
| C. | Polyvinyl chloride |
| D. | Polyethylene |
| E. | Polymethyl metacrylate |
| Answer» D. Polyethylene | |
| 334. |
Which of the following alloy does not contain tin? |
| A. | Gun metal |
| B. | Phosphor bronze |
| C. | Fusible plug material |
| D. | White metal |
| E. | All of the above |
| Answer» D. White metal | |
| 335. |
The behavious of visco-elastic material is |
| A. | Time dependent |
| B. | Independent of time |
| C. | Plastic |
| D. | Elastic |
| E. | Ductile |
| Answer» D. Elastic | |
| 336. |
When the temperature of a semi-conductor is reduced to absolute zero |
| A. | all electrons become free |
| B. | electrons move at higher velocities |
| C. | all valence electrons remain in the valence bond |
| D. | all valence electrons shift to forbidden gap |
| E. | None of the above |
| Answer» C. all valence electrons remain in the valence bond | |
| 337. |
Which of the following pipe will corrode easily? |
| A. | Stainless steel pipe |
| B. | GI pipe |
| C. | ERW pipe |
| D. | Copper pipe |
| E. | Lead pipe |
| Answer» C. ERW pipe | |
| 338. |
Identify the correct relation |
| A. | Mass number - Atomic number = Number of neutrons |
| B. | Mass number - Atomic number = Number of protons |
| C. | Number of neutrons - Number of protons = Mass number |
| D. | Number of electrons outside the nucleus - Number of proton = Mass number |
| E. | None of the above |
| Answer» A. Mass number - Atomic number = Number of neutrons | |
| 339. |
In which of the following case creep is an important consideration? |
| A. | Piston of an air compressor |
| B. | Exhaust valve of a diesel engine |
| C. | Blades of a steam turbine |
| D. | Flywheel of a petrol engine |
| E. | Shaft of a centrifugal compressor |
| Answer» C. Blades of a steam turbine | |
| 340. |
Malleal lity of a material is defined as |
| A. | Ability to withstand compressive stresses |
| B. | Ability to withstand deformation under shear |
| C. | Ability to undergo large permanent deformation in compression |
| D. | The property by which a material can be cold worked |
| E. | None of the above |
| Answer» C. Ability to undergo large permanent deformation in compression | |
| 341. |
The percentage of carbon in low carbon steel is |
| A. | 0.15 |
| B. | 1.3 |
| C. | 0.7 |
| D. | 1 |
| E. | 0.5 |
| Answer» A. 0.15 | |
| 342. |
Which process is used for joining parts or materials? |
| A. | Extruding |
| B. | Tumbling |
| C. | Swaging |
| D. | Parkerizing |
| E. | Sintering |
| Answer» E. Sintering | |
| 343. |
In case of eutectoid steels which one of the following structures has the maximum hardness? |
| A. | Troosite |
| B. | Sorbite |
| C. | Pearlite |
| D. | Acicular |
| E. | Martensite |
| Answer» E. Martensite | |
| 344. |
Ductility of material may be defined as |
| A. | Ability to undergo temporary deformation in tension |
| B. | Capacity to withstand combined tensile and shear forces |
| C. | Ability to undergo large permanent deformations in tension |
| D. | Capacity to withstand reversal of stresses |
| E. | Capacity to resist deformation under pressure |
| Answer» C. Ability to undergo large permanent deformations in tension | |
| 345. |
The Miller indices of the diagonal plane of a cube are |
| A. | 100 |
| B. | 0 |
| C. | 10 |
| D. | 110 |
| E. | 111 |
| Answer» D. 110 | |
| 346. |
The primary purpose of annealing is to |
| A. | Restrict the hardness of steel |
| B. | Soften the steel for machining after cold working |
| C. | Reduce carbon percentage |
| D. | Change the crystalline structure |
| E. | None of the above |
| Answer» B. Soften the steel for machining after cold working | |
| 347. |
Isotropic materials have |
| A. | Same elastic properties in all directions |
| B. | Cannot take shear as well as tensile stress |
| C. | Variable thermal as well as electrical conductivity |
| D. | Different elastic properties in different directions |
| E. | Different compressive and tensile stresses at different locations in the same material |
| Answer» A. Same elastic properties in all directions | |
| 348. |
Most of the energy expended in deforming a metal by cold working is |
| A. | Utilised in overcoming deformation stresses |
| B. | Utilised in deforming the metal |
| C. | Converted into heat |
| D. | Consumed in developing internal stresses |
| E. | None of the above |
| Answer» C. Converted into heat | |
| 349. |
The properties of cast iron are regulated by |
| A. | Heat treatment |
| B. | Percentage of carbon present |
| C. | Heating temperature |
| D. | The composition of raw material |
| E. | Control of amount, type, size and distribution of various carbon formations |
| Answer» E. Control of amount, type, size and distribution of various carbon formations | |
| 350. |
Polysterene is |
| A. | An alkyl halide |
| B. | A hydrocarbon |
| C. | An ester |
| D. | An alcohol |
| E. | Semi-conductors |
| Answer» B. A hydrocarbon | |
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