McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 401. |
Which of the following is used for imitation jewellery? |
| A. | Aluminium bronze |
| B. | Silicon bronze |
| C. | Gun metal |
| D. | Babbit alloy |
| E. | Duralumin |
| Answer» A. Aluminium bronze | |
| 402. |
The modulus of elasticity E, the modulus of rigidity C, and Poisson's ratio are related by the equation |
| A. | E = G (1+ 2 |
| B. | E = 2G (1 - 2 |
| C. | E = 2G (1 - |
| D. | E = G (2 + |
| E. | E = 2G (1 + |
| Answer» E. E = 2G (1 + | |
| 403. |
Cyaniding is the process of |
| A. | Adding carbon and nitrogen to increase hardness of specimen uniformly |
| B. | Adding carbon and nitrogen to increase hardness at the surface |
| C. | Adding carbon steel |
| D. | Adding carbon and nitrogen to increase hardness of core |
| E. | Creating a layer on the surface to impart the property of wear resistance |
| Answer» B. Adding carbon and nitrogen to increase hardness at the surface | |
| 404. |
Which of the following can have positive or negative charge? |
| A. | Neutron |
| B. | Isotope |
| C. | Hole |
| D. | Electron |
| E. | Iron |
| Answer» E. Iron | |
| 405. |
Which of the following material has lowest specific gravity? |
| A. | Aluminium |
| B. | Brass |
| C. | Copper |
| D. | High carbon steel |
| E. | Zinc |
| Answer» A. Aluminium | |
| 406. |
The cast iron has |
| A. | High ductility |
| B. | High malleability |
| C. | High tensile strength |
| D. | Elastic limit close to ultimate breaking strength |
| E. | None of the above |
| Answer» C. High tensile strength | |
| 407. |
Blisters in wrought iron cause |
| A. | Brittleness at high temperatures |
| B. | Brittleness at low temperatures |
| C. | Loose textured metal |
| D. | Voids created due to chemical reaction between carbon and iron oxide |
| E. | None of the above |
| Answer» C. Loose textured metal | |
| 408. |
Limestone is added in blast furnace to flux |
| A. | Silicon xoide |
| B. | Carbon |
| C. | MnO2 |
| D. | Sulphur |
| E. | None of the above |
| Answer» A. Silicon xoide | |
| 409. |
Ligancy is |
| A. | the number of atoms (or ions) surrounding and touching a central atom |
| B. | a covalent bond between two atoms |
| C. | the angle betweent he two closest directional bond of an atom |
| D. | None of the above |
| E. | None of the above |
| Answer» A. the number of atoms (or ions) surrounding and touching a central atom | |
| 410. |
The moisture content in a well seasoned timber is |
| A. | 4 to 6 percent |
| B. | 6 to 8 percent |
| C. | 10 to 15 percent |
| D. | 20 to 25 percent |
| E. | None of the above |
| Answer» D. 20 to 25 percent | |
| 411. |
The product of a cupola known as |
| A. | Malleable iron |
| B. | Steel |
| C. | Pig iron |
| D. | Cast iron |
| E. | Cast steel |
| Answer» D. Cast iron | |
| 412. |
The process of production of articles having a soft ductile interior and a very hard surface, is known as |
| A. | Hardening |
| B. | Hardening and tempering |
| C. | Case hardening |
| D. | Hardening and annealing |
| E. | None of the above |
| Answer» C. Case hardening | |
| 413. |
The blast furnace uses the following as fuel |
| A. | Blast furnace gas |
| B. | Cooking coal |
| C. | Producer gas |
| D. | Coke |
| E. | Coal |
| Answer» D. Coke | |
| 414. |
If steel is cooled in still air, the structure obtained is |
| A. | Acicular |
| B. | Pearlite |
| C. | Martensite |
| D. | Sorbite |
| E. | Troosite |
| Answer» D. Sorbite | |
| 415. |
In reinforced conccrete, steel rods are used to increase |
| A. | Tensile strength |
| B. | Compressive strength |
| C. | Shear strength |
| D. | None of the above |
| E. | Semi-conductors |
| Answer» A. Tensile strength | |
| 416. |
Lime stone acts as a flux in a cupola. It is generally added in the proportion |
| A. | 30 kg of limestone per tonner of iron |
| B. | One tonne of limestone per tonne of charge |
| C. | 10 kg of limestone per tonne of iron |
| D. | 500 kg of limestone per tonne of coke |
| E. | 100 kg of limestone per tonne of iron |
| Answer» E. 100 kg of limestone per tonne of iron | |
| 417. |
Identify the correct statement |
| A. | A metal which is brittle in tension may be ductile under hydrostatic compression |
| B. | All materials undergo plastic deformation |
| C. | In elastic materials yield stress and tensile strength are practically identical |
| D. | A completely brittle material would not fracture at elastic limit |
| E. | Brittleness is an important engineering consideration, because it allows the materials to redistribute localized stresses |
| Answer» A. A metal which is brittle in tension may be ductile under hydrostatic compression | |
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