McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 351. |
Steel cannot be hardened unless it is heated |
| A. | Between the first and second critical point |
| B. | Above the middle critical point |
| C. | Above the lowest critical point |
| D. | Above the highest critical point |
| E. | Between the second and third critical point |
| Answer» C. Above the lowest critical point | |
| 352. |
Case hardening |
| A. | Is done to get a soft ductile interior with a very hard surface |
| B. | Is done to induce hardness in the core of materials |
| C. | Is followed by tempering |
| D. | Is allowed by carburizing |
| E. | Is preceded by tempering |
| Answer» A. Is done to get a soft ductile interior with a very hard surface | |
| 353. |
High ratio of surface to mass tend to |
| A. | Produce smaller depths of hardening |
| B. | Produce non-uniformity in hardness on surface |
| C. | Produce only chilled surfaces |
| D. | Produce surface defects |
| E. | Produce greater depth of hardening |
| Answer» E. Produce greater depth of hardening | |
| 354. |
The machine used for determining tensile strength of steel is |
| A. | Hydraulic jack |
| B. | Hydraulic press |
| C. | Mechanical press |
| D. | Universal testing machine |
| E. | None of the above |
| Answer» D. Universal testing machine | |
| 355. |
Toughness of a material means |
| A. | Stress relieving |
| B. | Softening |
| C. | Machinability |
| D. | Strength |
| E. | Fatigue resistance |
| Answer» D. Strength | |
| 356. |
Blast furnace gas is |
| A. | Used as fuel in a blast furnace |
| B. | A by-product of blast furnace |
| C. | A flue gas discharged to atmosphere |
| D. | Used as a cooking gas |
| E. | Highly poisonous |
| Answer» B. A by-product of blast furnace | |
| 357. |
Materials in order of reducing electrical conductivity are |
| A. | Aluminium, Silver, Gold, Copper |
| B. | Gold, Silver, Copper, Aluminium |
| C. | Copper, Silver, Gold,Aluminium |
| D. | Silver, Copper, Gold, Aluminium |
| E. | None of the above |
| Answer» D. Silver, Copper, Gold, Aluminium | |
| 358. |
The critical points for steels |
| A. | Change the chemical composition of steel |
| B. | Cause change in physical properties |
| C. | Indicate the minimum temperature below which structural changes in steel are not possible |
| D. | May change in number on heating or cooling |
| E. | Occur at same temperature for all steels |
| Answer» B. Cause change in physical properties | |
| 359. |
Grey iron |
| A. | Has low ductility |
| B. | Breaks with appreciable distortion |
| C. | Has brittleness |
| D. | Low compression strength |
| E. | None of the above |
| Answer» A. Has low ductility | |
| 360. |
Crystal structure of a material is generally examined by |
| A. | Microscope |
| B. | Naked eye |
| C. | Spectroscope techniques |
| D. | X-rays and electron diffraction |
| E. | Optical microscope |
| Answer» D. X-rays and electron diffraction | |
| 361. |
Which is the heaviest? |
| A. | Positron |
| B. | Proton |
| C. | Electron |
| D. | Neutron |
| E. | Atom |
| Answer» E. Atom | |
| 362. |
If a solid cube is subjected to equal tensile stresses on all its faces the volumetric strain is n times the linear strain, where |
| A. | n = 1 |
| B. | n = 2 |
| C. | n = 6 |
| D. | n = 3 |
| E. | n = 9 |
| Answer» E. n = 9 | |
| 363. |
The process of pulling a rod through series of decreasing diameters is known as |
| A. | Wire drawing |
| B. | Metal spinning |
| C. | Trimming |
| D. | Staking |
| E. | Stretch forming |
| Answer» A. Wire drawing | |
| 364. |
Line imperfection in a crystal is called |
| A. | Schottky defect |
| B. | Frenkel defect |
| C. | Edge dislocation |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. Edge dislocation | |
| 365. |
The process of polymerisation is associated with |
| A. | Thermo-plastic |
| B. | High speed steel |
| C. | Cast iron |
| D. | Non-ferrous material |
| E. | Non-metallic materials |
| Answer» A. Thermo-plastic | |
| 366. |
Selenium is |
| A. | Intrinsic semi-conductor |
| B. | Extrinsic semi-conductor |
| C. | P-type semi-conductor |
| D. | N-type semi-conductor |
| E. | None of the above |
| Answer» A. Intrinsic semi-conductor | |
| 367. |
Which of the following is not a semi-conductor? |
| A. | Silicon |
| B. | Tetraethyl lead |
| C. | Gallium Arsenide |
| D. | Germanium |
| E. | All of the above |
| Answer» B. Tetraethyl lead | |
| 368. |
The main constituent of dynamite is |
| A. | Sulphur |
| B. | Oxygen |
| C. | Nitroglycerine |
| D. | Potassium chlorate |
| E. | Sodium nitrate |
| Answer» C. Nitroglycerine | |
| 369. |
To chck the performance of a substance in deep drawing, the test usually conducted is |
| A. | Charpy test |
| B. | Fatigue test |
| C. | Cupping test |
| D. | Tensile test |
| E. | Izod test |
| Answer» C. Cupping test | |
| 370. |
Which of the following is the characteristic of ceramic materials? |
| A. | Malleability and ductility |
| B. | Hardness and brittleness |
| C. | Elasticity and plasticity |
| D. | Porosity and flexibility |
| E. | None of the above |
| Answer» B. Hardness and brittleness | |
| 371. |
Sheradising process is used for |
| A. | Cold working on metals |
| B. | Heat treatment of steels |
| C. | Machining metals |
| D. | Heat treatment of high speed steels |
| E. | Surface coating |
| Answer» E. Surface coating | |
| 372. |
Nichrome are alloys of |
| A. | Nickel, chromium and aluminium |
| B. | Nickel, chromium |
| C. | Nickel, chromium and silver |
| D. | Nickel, chromium and iron |
| E. | Nickel, chromium and copper |
| Answer» C. Nickel, chromium and silver | |
| 373. |
Identify the incorrect statement |
| A. | The greatest error in Briuell hardness measurements occur in measuring the diameter of specimen |
| B. | Harder the material, greater the elastic recovery after deformation |
| C. | Owing to elastic recovery, the radius of curvature of the indentation will be larger than that of the spherical indentor |
| D. | None of the above |
| E. | Resilience |
| Answer» D. None of the above | |
| 374. |
The modulus of elasticity E, the bulk modulus of elasticity K and the Poisson's ratio are related by the relation |
| A. | K = (1 + |
| B. | E = K (1 - |
| C. | E = 3K (1 - 2 |
| D. | E = K (2 + |
| E. | E = 2K (1 + |
| Answer» C. E = 3K (1 - 2 | |
| 375. |
Phenol and formaldehyde are polymerised to a resultant product known as |
| A. | PVC |
| B. | Bakelite |
| C. | Polyester |
| D. | None of the above |
| E. | Semi-conductors |
| Answer» B. Bakelite | |
| 376. |
In pack-carburising carbon is supplied |
| A. | In the form of charcoal |
| B. | Through gas |
| C. | In the form of hydrocarbons |
| D. | In the form of calcium carbide |
| E. | In the form of graphite |
| Answer» A. In the form of charcoal | |
| 377. |
Identify the incorrect statement, if any |
| A. | Dislocations in real crystals are generally straight lines which are generally in same plane |
| B. | Dislocations in real crystals are rarely straight lines and rarely lie in a single plane |
| C. | A dislocation is the linear lattice defect that is responsible for nearly all aspects of the plastic deformation of metals |
| D. | The strain field at the dislocation results in a different intensity |
| E. | The strain field at the dislocation results in a different intensity |
| Answer» A. Dislocations in real crystals are generally straight lines which are generally in same plane | |
| 378. |
Brinell hardness number for soft brass is usually in the range |
| A. | 300-450 |
| B. | 50-70 |
| C. | 10--50 |
| D. | 80-150 |
| E. | 150-300 |
| Answer» B. 50-70 | |
| 379. |
Compressve strength of wood is usually |
| A. | Zinc |
| B. | Maximum at 45? to the direction of grains |
| C. | More along the grains |
| D. | Equal in all directions |
| E. | More across the grains |
| Answer» C. More along the grains | |
| 380. |
Fatigue cracks in metals normally start at |
| A. | Centre of the specimen |
| B. | Surface of the specimen |
| C. | Any spot in the specimen |
| D. | Ends of the specimen |
| E. | Core of the specimen |
| Answer» B. Surface of the specimen | |
| 381. |
Steel with 0.8% carbon and 100% pearlite is called |
| A. | Eutectoid |
| B. | Hyper-eutectoid |
| C. | Austenite |
| D. | Solid's |
| E. | None of the above |
| Answer» A. Eutectoid | |
| 382. |
Spot the process which is different from others? |
| A. | Galvanizing |
| B. | Forging |
| C. | Cold heading |
| D. | Drop forging |
| E. | Hot rolling |
| Answer» C. Cold heading | |
| 383. |
Dislocations in materials are |
| A. | Point defects |
| B. | Either point or planer defects |
| C. | Planer defects |
| D. | Either point, line or planer defects |
| E. | Line defects |
| Answer» E. Line defects | |
| 384. |
When a ferromagnetic substance is magnetised, small changes in dimensions occur. Such a phenomenon is known as |
| A. | magnetic hysteresis |
| B. | magnetic expansion |
| C. | magneto striction |
| D. | magneto-calorisation |
| E. | None of the above |
| Answer» C. magneto striction | |
| 385. |
Age hardening is related with |
| A. | Stainless steel |
| B. | Cast iron |
| C. | Gun metal |
| D. | Duralumin |
| E. | German silver |
| Answer» A. Stainless steel | |
| 386. |
Cast iron contains |
| A. | 0.2 to 0.4% carbon |
| B. | 0.4% to 0.7% carbon |
| C. | 1 to 1.3% carbon |
| D. | 2 to 4% carbon |
| E. | None of the above |
| Answer» D. 2 to 4% carbon | |
| 387. |
Neoprene is |
| A. | Rubber |
| B. | Plastic |
| C. | Rubber like plastic |
| D. | None of the above |
| E. | Semi-conductors |
| Answer» C. Rubber like plastic | |
| 388. |
The intensity of magnetisation M of a ferromagnetic solid |
| A. | is independent of temperature |
| B. | increases with increasing temperature |
| C. | decreases with increasing temperature |
| D. | depends primarily on method of heating |
| E. | None of the above |
| Answer» C. decreases with increasing temperature | |
| 389. |
Which of the following aluminium alloy is commonly used for utensils? |
| A. | Babbit alloy |
| B. | Hindalium |
| C. | Magnalium |
| D. | Duralumin |
| E. | Y-alloy |
| Answer» B. Hindalium | |
| 390. |
Which of the following is incorrect for diamond? |
| A. | Transparent |
| B. | Densest form of carbon |
| C. | White in colour |
| D. | Insoluble in all solvents |
| E. | An allotrope of graphite |
| Answer» B. Densest form of carbon | |
| 391. |
The elastic limit of cast iron is |
| A. | Close to ultimate breaking strength |
| B. | High |
| C. | Same as that of mild steel |
| D. | Low |
| E. | Low compression strength |
| Answer» A. Close to ultimate breaking strength | |
| 392. |
Bush bearings is |
| A. | Phosphor bronze |
| B. | Aluminium bronze |
| C. | Mild steel |
| D. | White metal alloy |
| E. | None of the above |
| Answer» D. White metal alloy | |
| 393. |
Silicon doped with gallium is |
| A. | intrinsic semi-conductor |
| B. | extrinsic semi-conductor |
| C. | p-type semi-conductor |
| D. | n-type semi-conductor |
| E. | None of the above |
| Answer» C. p-type semi-conductor | |
| 394. |
The permeability of soft iron can be increased by |
| A. | purifying it |
| B. | reducing carbon percentage |
| C. | alloying with cobalt |
| D. | increasing carbon percentage |
| E. | None of the above |
| Answer» C. alloying with cobalt | |
| 395. |
The fatigue strength of materials increases |
| A. | By over stressing the specimen |
| B. | With temperature |
| C. | By having notches in specimen |
| D. | By having scratch on the surface |
| E. | By under stressing the specimen |
| Answer» E. By under stressing the specimen | |
| 396. |
Thermosetting polymers are |
| A. | Injection moulded |
| B. | Extruded |
| C. | Cast moulded |
| D. | None of the above |
| E. | Semi-conductors |
| Answer» C. Cast moulded | |
| 397. |
Dies for drawing are generally made of |
| A. | Cast iron |
| B. | Mild steel |
| C. | High carbon steel |
| D. | Stainless steel |
| E. | None of the above |
| Answer» E. None of the above | |
| 398. |
Which of the following is the hardest material? |
| A. | Gold |
| B. | Stainless steel |
| C. | Cemented carbide |
| D. | Diamond |
| E. | High speed steel |
| Answer» D. Diamond | |
| 399. |
Which of the following is the ferroelectric material? |
| A. | Rechelle salt |
| B. | Barium titanate |
| C. | Potassium dehydrogen phosphate |
| D. | All of the above |
| E. | None of the above |
| Answer» C. Potassium dehydrogen phosphate | |
| 400. |
The crystal structure of a material can be studied by |
| A. | Electron microscope |
| B. | X-ray difraction |
| C. | Electron probe X-ray microanalyser |
| D. | All of the above |
| E. | Semi-conductors |
| Answer» B. X-ray difraction | |
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