MCQOPTIONS
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MCQOPTIONS
This section includes 482 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Thermoplastic materials are those materials which |
| A. | Are formed into shape under heat and pressure and results in a permanently hard product |
| B. | Do not become hard with the application of heat and pressure and no chemical change occurs |
| C. | Are flexible and can withstand considerable wear under suitable conditions |
| D. | Are used as a friction lining for clutches and brakes |
| Answer» C. Are flexible and can withstand considerable wear under suitable conditions | |
| 452. |
Gun metal contains |
| A. | 70% copper and 30% zinc |
| B. | 90% copper and 10% tin |
| C. | 85 - 92% copper and rest tin with little lead and nickel |
| D. | 70 - 78% copper and rest tin |
| Answer» D. 70 - 78% copper and rest tin | |
| 453. |
Closed packed hexagonal space lattice is found in |
| A. | Zinc, magnesium, cobalt, cadmium, antimony and bismuth |
| B. | Gamma-iron, aluminium, copper, lead, silver and nickel |
| C. | Alpha-iron, tungsten, chromium and molybdenum |
| D. | None of the above |
| Answer» B. Gamma-iron, aluminium, copper, lead, silver and nickel | |
| 454. |
In process annealing, the hypo eutectoid steel is |
| A. | Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air |
| B. | Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium |
| C. | Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace |
| D. | Heated below or closes to the lower critical temperature and then cooled slowly |
| Answer» E. | |
| 455. |
The purpose of heat treatment is to |
| A. | Relieve the stresses set up in the material after hot or cold working |
| B. | Modify the structure of the material |
| C. | Change grain size |
| D. | Any one of these |
| Answer» E. | |
| 456. |
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is |
| A. | Silver metal |
| B. | Duralumin |
| C. | Hastelloy |
| D. | Invar |
| Answer» E. | |
| 457. |
Shock resisting steels should have |
| A. | Low wear resistance |
| B. | Low hardness |
| C. | Low tensile strength |
| D. | Toughness |
| Answer» E. | |
| 458. |
Which of the following display properties similar to that of steel? |
| A. | Blackheart cast iron |
| B. | Whiteheart cast iron |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 459. |
The unit cells |
| A. | Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal |
| B. | Have the same orientation and their similar faces are parallel |
| C. | May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice |
| D. | All of the above |
| Answer» E. | |
| 460. |
The blade of a power saw is made of |
| A. | Boron steel |
| B. | High speed steel |
| C. | Stainless steel |
| D. | Malleable cast iron |
| Answer» C. Stainless steel | |
| 461. |
The lower critical point for all steels is |
| A. | 600°C |
| B. | 700°C |
| C. | 723°C |
| D. | 913°C |
| Answer» D. 913¬¨‚àûC | |
| 462. |
The alloying element which can replace tungsten in high speed steels is |
| A. | Nickel |
| B. | Vanadium |
| C. | Cobalt |
| D. | Molybdenum |
| Answer» E. | |
| 463. |
Which of the following material has nearly zero coefficient of expansion? |
| A. | Stainless steel |
| B. | High speed steel |
| C. | Invar |
| D. | Heat resisting steel |
| Answer» D. Heat resisting steel | |
| 464. |
Cast iron is manufactured in |
| A. | Blast furnace |
| B. | Cupola |
| C. | Open hearth furnace |
| D. | Bessemer converter |
| Answer» C. Open hearth furnace | |
| 465. |
The portion of the blast furnace below its widest cross-section is called |
| A. | Hearth |
| B. | Stack |
| C. | Bosh |
| D. | Throat |
| Answer» D. Throat | |
| 466. |
Y-alloy contains |
| A. | 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium |
| B. | 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium |
| C. | 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium |
| D. | 5 to 6% tin, 2 to 3% copper and rest aluminium |
| Answer» C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium | |
| 467. |
A small percentage of boron is added to steel in order to |
| A. | Increase hardenability |
| B. | Reduce machinability |
| C. | Increase wear resistance |
| D. | Increase endurance strength |
| Answer» B. Reduce machinability | |
| 468. |
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements? |
| A. | Babbitt metal |
| B. | Monel metal |
| C. | Nichrome |
| D. | Phosphor bronze |
| Answer» D. Phosphor bronze | |
| 469. |
Isotropic materials are those which have the same |
| A. | Elastic properties in all directions |
| B. | Stresses induced in all directions |
| C. | Thermal properties in all directions |
| D. | Electric and magnetic properties in all directions |
| Answer» B. Stresses induced in all directions | |
| 470. |
Inconel contains |
| A. | 65% nickel, 15% chromium and 20% 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. | |
| 471. |
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces |
| A. | White cast iron |
| B. | Nodular cast iron |
| C. | Malleable cast iron |
| D. | Alloy cast iron |
| Answer» E. | |
| 472. |
Smelting is the process of |
| A. | Removing the impurities like clay, sand etc. from the iron ore by washing with water |
| B. | Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns |
| C. | Reducing the ore with carbon in the presence of a flux |
| D. | All of the above |
| Answer» D. All of the above | |
| 473. |
The main alloying elements high speed steel in order of increasing proportion are |
| A. | Vanadium, chromium, tungsten |
| B. | Tungsten, titanium, vanadium |
| C. | Chromium, titanium, vanadium |
| D. | Tungsten, chromium, titanium |
| Answer» B. Tungsten, titanium, vanadium | |
| 474. |
The machinability of steel is improved by adding |
| A. | Nickel |
| B. | Chromium |
| C. | Nickel and chromium |
| D. | Sulphur, lead and phosphorus |
| Answer» E. | |
| 475. |
Iron ore is usually found in the form of |
| A. | Oxides |
| B. | Carbonates |
| C. | Sulphides |
| D. | All of these |
| Answer» E. | |
| 476. |
Phosphor bronze contains |
| A. | 0.5% of phosphorous |
| B. | 1% phosphorous |
| C. | 2.5% phosphorous |
| D. | None of the above |
| Answer» E. | |
| 477. |
The alloying element which reduces the formation of iron sulphide in steel is |
| A. | Chromium |
| B. | Nickel |
| C. | Vanadium |
| D. | Manganese |
| Answer» E. | |
| 478. |
In grey cast iron, carbon is present in the form of |
| A. | Cementite |
| B. | Free carbon |
| C. | Flakes |
| D. | Spheroids |
| Answer» D. Spheroids | |
| 479. |
Super conduction by metals is observed in the temperature range of |
| A. | Below 10°K |
| B. | Above 100°K |
| C. | Around 0°C |
| D. | Around 100°C |
| Answer» B. Above 100¬¨‚àûK | |
| 480. |
The property of a material due to which it breaks with little permanent distortion, is called |
| A. | Brittleness |
| B. | Ductility |
| C. | Malleability |
| D. | Plasticity |
| Answer» B. Ductility | |
| 481. |
Which of the following property is desirable for materials used in tools and machines? |
| A. | Elasticity |
| B. | Plasticity |
| C. | Ductility |
| D. | Malleability |
| Answer» B. Plasticity | |
| 482. |
The metal suitable for bearings subjected to heavy loads, is |
| A. | Silicon bronze |
| B. | White metal |
| C. | Monel metal |
| D. | Phosphor bronze |
| Answer» C. Monel metal | |