McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 401. |
(111) is a plane of the cube & is |
| A. | horizontal |
| B. | vertical |
| C. | inclined to z axis |
| D. | none of the above |
| Answer» C. inclined to z axis | |
| 402. |
The crystal structure of most common metals is |
| A. | hexagonal |
| B. | cubic |
| C. | orthorhombi c |
| D. | triclinic |
| Answer» B. cubic | |
| 403. |
A crystal structure in a regular array of atoms is arranged in one of the space lattices |
| A. | 10 |
| B. | 12 |
| C. | 14 |
| D. | none of the above |
| Answer» C. 14 | |
| 404. |
The linear disturbance of atomic arrangement is known as |
| A. | imperfectio ns |
| B. | slip |
| C. | dislocations |
| D. | none of the above |
| Answer» C. dislocations | |
| 405. |
is a system of notations of planes within a crystal of space lattice |
| A. | space lattice |
| B. | burger vector |
| C. | miller indices |
| D. | none of the above |
| Answer» C. miller indices | |
| 406. |
Atom movements in twinnning are much than atomic spacing |
| A. | more |
| B. | less |
| C. | equal |
| D. | none of the above |
| Answer» B. less | |
| 407. |
diffusion implies atomic movement along the surface of a plane |
| A. | atomic |
| B. | surface |
| C. | volume |
| D. | grain boundary |
| Answer» B. surface | |
| 408. |
In a simple cubic structure, [100] and (100) parallel? |
| A. | no |
| B. | yes |
| C. | maybe yes |
| D. | none of the above |
| Answer» A. no | |
| 409. |
The miller indices of a plane are proportional to : |
| A. | the reciprocal of numerical parameters of the intercepts |
| B. | the square of unit cell dimensions |
| C. | the interccepts of the planes on the coordinate axes |
| D. | interplaner spacing |
| Answer» A. the reciprocal of numerical parameters of the intercepts | |
| 410. |
A material having different properties in different directions is known as |
| A. | isotropic |
| B. | anisotropic |
| C. | crystalline |
| D. | amorphous |
| Answer» B. anisotropic | |
| 411. |
Presence of carbon atom in iron is an example of impurity |
| A. | substitution al |
| B. | interstitial |
| C. | frankel |
| D. | schottky |
| Answer» B. interstitial | |
| 412. |
Directions of edge dislocation & burger vector are to each other |
| A. | perpendicul ar |
| B. | parallel |
| C. | inclined at 45° |
| D. | concurrent |
| Answer» A. perpendicul ar | |
| 413. |
On thermal excitation this defect may cause |
| A. | vacancy |
| B. | edge dislocations |
| C. | screw dislocations |
| D. | none of the above |
| Answer» A. vacancy | |
| 414. |
The grain boundary area decreases when a polycrystalline material is heated |
| A. | below recrystalliza tion temp. |
| B. | above recrystalliza tion temp. |
| C. | above room temp. |
| D. | below 0.5 tm |
| Answer» B. above recrystalliza tion temp. | |
| 415. |
Ideal crystals have |
| A. | no imperfectio ns |
| B. | real crystals |
| C. | vaccancies |
| D. | frenkel defects |
| Answer» A. no imperfectio ns | |
| 416. |
The imperfections may be minimised by |
| A. | thermal energy |
| B. | making metal in fibre form |
| C. | surface treatment |
| D. | all of the above |
| Answer» D. all of the above | |
| 417. |
Volume imperfections can be |
| A. | twin |
| B. | slip |
| C. | stacking fault |
| D. | noncrystalli ne regions |
| Answer» D. noncrystalli ne regions | |
| 418. |
The cross slip occurs in : |
| A. | climb up motion |
| B. | screw dislocation |
| C. | gliding motion |
| D. | none of the above |
| Answer» B. screw dislocation | |
| 419. |
.......... defects are inperfect point like region in a crystal. |
| A. | line |
| B. | point |
| C. | edge |
| D. | screw |
| Answer» B. point | |
| 420. |
A ............is the simplest point defect and envolves a missing atom within a metal. |
| A. | schottky |
| B. | vacancy |
| C. | line |
| D. | dislocation |
| Answer» B. vacancy | |
| 421. |
-------- imperfections involve vacancies of a pair ions of opposite charges. |
| A. | frankel |
| B. | schottky |
| C. | dislocation |
| D. | point |
| Answer» B. schottky | |
| 422. |
The displacement distance for atoms around the dislocation is the---- --. |
| A. | burger vector |
| B. | screw |
| C. | edge |
| D. | point |
| Answer» A. burger vector | |
| 423. |
-------- dislocation can glide and climb. |
| A. | screw |
| B. | edge |
| C. | cross |
| D. | atomic |
| Answer» B. edge | |
| 424. |
-------- are difined as the irregularities in the structure of metals. |
| A. | atomic |
| B. | dislocation |
| C. | point |
| D. | vacancies |
| Answer» B. dislocation | |
| 425. |
Surface defects are the -------- dimensional regions in a crystal. |
| A. | three |
| B. | two |
| C. | four |
| D. | one |
| Answer» B. two | |
| 426. |
-------- dislocation plays an important role in crystal growth. |
| A. | edge |
| B. | screw |
| C. | vacancies |
| D. | schotty |
| Answer» B. screw | |
| 427. |
Work hardening reduces: |
| A. | malleability |
| B. | hardness |
| C. | toughness |
| D. | ductility |
| Answer» D. ductility | |
| 428. |
-------- is the low temperature phenomenon which results in the rstoration of the physical properties without any observable change in microstructure. |
| A. | grain size |
| B. | recovery |
| C. | grain growth |
| D. | recrystalliz at ion |
| Answer» B. recovery | |
| 429. |
Grain growth is an increase in ----- --. |
| A. | grain size |
| B. | hardness |
| C. | malleability |
| D. | brittleness |
| Answer» A. grain size | |
| 430. |
A metal is said to be--------- worked, if it is mechanically processed below the crystallization temperature of the metal. |
| A. | hot |
| B. | cold |
| C. | rolled |
| D. | bend |
| Answer» B. cold | |
| 431. |
Chances of cracks propogation is more in: |
| A. | hot working |
| B. | cold working |
| C. | welding |
| D. | mechining |
| Answer» B. cold working | |
| 432. |
In ------working refinement of crystal occures. |
| A. | cold |
| B. | hot |
| C. | annealing |
| D. | none of above |
| Answer» B. hot | |
| 433. |
-------- working is always accompanied by strain hardening. |
| A. | hot |
| B. | cold |
| C. | rolled |
| D. | all these of above |
| Answer» B. cold | |
| 434. |
-------- working increases ultimate tensile strength. |
| A. | cold |
| B. | hot |
| C. | annealing |
| D. | none of the above |
| Answer» A. cold | |
| 435. |
Annealing is done: |
| A. | to harden the surface |
| B. | surface smoothnes s |
| C. | relievin g stresse s |
| D. | improving micro structure for good surface finish |
| Answer» C. relievin g stresse s | |
| 436. |
Among the crystal structure, which has the highest packing fraction. |
| A. | bcc |
| B. | fcc |
| C. | diamon d cube |
| D. | hcp |
| Answer» B. fcc | |
| 437. |
The miller indices are the same for: |
| A. | parall el plane s |
| B. | perpendicul a r planes |
| C. | orthogon al planes |
| D. | crystallogra p hic planes |
| Answer» A. parall el plane s | |
| 438. |
The crystal structure of silver is: |
| A. | fcc |
| B. | bcc |
| C. | hcp |
| D. | none of the above |
| Answer» A. fcc | |
| 439. |
0.68 is the atomic packing factore of: |
| A. | bcc |
| B. | fcc |
| C. | simple cube |
| D. | hcp |
| Answer» A. bcc | |
| 440. |
(001) is a plane of the cube and is: |
| A. | horizontal |
| B. | vertical |
| C. | inclined to vp |
| D. | inclined to hp |
| Answer» A. horizontal | |
| 441. |
The crystal structure of all the following material is HCP except: |
| A. | graphite |
| B. | zinc |
| C. | magnesium |
| D. | aluminium |
| Answer» D. aluminium | |
| 442. |
The crystal structure of graphite is: |
| A. | hcp |
| B. | fcc |
| C. | bcc |
| D. | none of the above |
| Answer» A. hcp | |
| 443. |
The crystal structure of Germanium is: |
| A. | hcp |
| B. | bcc |
| C. | fcc |
| D. | diamon d cube |
| Answer» D. diamon d cube | |
| 444. |
How many atoms are there per unit cell in a body centered cubic lattice system? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» A. 2 | |
| 445. |
How many molecules per unit cell are there in a face centered cubic lattice? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» B. 4 | |
| 446. |
The crystal structure of most common metal is: |
| A. | hexagonal |
| B. | cubic |
| C. | orthorhomb i c |
| D. | any of the above |
| Answer» B. cubic | |
| 447. |
The metal which has got BCC structure is: |
| A. | silver |
| B. | tungsten |
| C. | zinc |
| D. | aluminiu m watch |
| Answer» B. tungsten | |
| 448. |
The structure of SiO2 quartz is: |
| A. | hcp |
| B. | bcc |
| C. | fcc |
| D. | orthorhomb i c |
| Answer» A. hcp | |
| 449. |
The metal which has HCP structure is: |
| A. | silver |
| B. | iron |
| C. | magnesium |
| D. | aluminium |
| Answer» C. magnesium | |
| 450. |
The crystal structure of the following materials is FCC except: |
| A. | aluminium |
| B. | magnesium |
| C. | nickel |
| D. | copper |
| Answer» B. magnesium | |
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