MCQOPTIONS
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MCQOPTIONS
This section includes 1232 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
corrosion inhibitors are the chemicals that react with the metal surface, gets absorb and form a thin film on metal . This statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. false | |
| 302. |
corrosion inhibitors are applied on the metal by electroplating process. Te statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 303. |
corrosion inhibitors are used to protect the metal from corrosion. This statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. false | |
| 304. |
one of the following is a metal used for metallic coatings, used fro protection from corrosion |
| A. | chromate coating |
| B. | phosphate coating |
| C. | plastic coating |
| D. | all of the above |
| Answer» E. | |
| 305. |
in electroplating process for metal coating, the metallic component on which coating is needed, is made anode in the process. This statement is |
| A. | false |
| B. | true |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. true | |
| 306. |
one of the following is a non-metallic coatings, used for protection from corrosion |
| A. | chromate coating |
| B. | phosphate coating |
| C. | plastic coating |
| D. | all of the above |
| Answer» E. | |
| 307. |
in electroplating process for a metal coating, the metallic component on which coating is |
| A. | anode |
| B. | cathode |
| C. | electrolyte solution |
| D. | none of the above |
| Answer» C. electrolyte solution | |
| 308. |
in hot dipping method of metal coating, which metal is coated on the steel to protect from corrosion ? |
| A. | silver |
| B. | aluminium |
| C. | chromium |
| D. | zinc |
| Answer» E. | |
| 309. |
in hot dipping process, liquid metal of zinc is never used in any case. This statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 310. |
one of following method is a metallic coating method for protection from corrosion |
| A. | metal spraying |
| B. | electroplatin g |
| C. | metal cladding |
| D. | all of the above |
| Answer» E. | |
| 311. |
in hot dipping method of metal coating, which one of the following metal is used ? |
| A. | copper |
| B. | silver |
| C. | aluminium |
| D. | none of the above |
| Answer» E. | |
| 312. |
metalic coatings are more durable than nonmetalic coatings. This statement is |
| A. | false |
| B. | true |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 313. |
non metallic coating gives best protection against corrosion over metallic coating. The statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 314. |
metaliic coatings gives best protection against corrosion over metallic coating. The statement is |
| A. | false |
| B. | true |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 315. |
non metalic coatings are more durable than metallic coatings. The given statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 316. |
the rate of corrosion increases as the temperature ncreases. The statement given is |
| A. | false |
| B. | true |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 317. |
the best example of high temperature corrosion is |
| A. | creep failure |
| B. | oxidation |
| C. | high temperature hydrogen attack |
| D. | all of the above |
| Answer» E. | |
| 318. |
high temperature corrosion of a carbon stee; can be a problem at a temperature above |
| A. | 500 oc |
| B. | 1000 oc |
| C. | 1500 oc |
| D. | none of the above |
| Answer» B. 1000 oc | |
| 319. |
one of the following is a preventive measure to control corrosion fatigue failure |
| A. | eliminate cyclic stresses |
| B. | reduces stress concentratio n |
| C. | obtain a smooth and shiny surface on the metal |
| D. | all of the above |
| Answer» E. | |
| 320. |
one of the following methods is not a corrosion prevention method |
| A. | internal and external coating |
| B. | corrosion inhibitor |
| C. | cathodic and anodic protection |
| D. | all of the above |
| Answer» E. | |
| 321. |
fatigue fracture is always initiated at |
| A. | discontinuity on the surface |
| B. | dicontinuity in the center of a metal |
| C. | without any discontinity in the metal |
| D. | none of the above |
| Answer» B. dicontinuity in the center of a metal | |
| 322. |
fatigue life of a metal in air is better than fatigue life in sea water. This statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. false | |
| 323. |
cracking due to corrosion fatigue is mainly combine effect of |
| A. | temperature and sluid flow |
| B. | fluid velocity and stress |
| C. | stress and corrosion |
| D. | none of the above |
| Answer» E. | |
| 324. |
metallic component gets fatigue due to which type of stresses applied |
| A. | tensile stresses |
| B. | compression stresses |
| C. | shear stresses |
| D. | cyclic stresses |
| Answer» E. | |
| 325. |
hydrogen blistering is happen only because of |
| A. | atomic oxygen that |
| B. | atomic hydrogen |
| C. | atomic nitrogen that |
| D. | none of the |
| Answer» C. atomic nitrogen that | |
| 326. |
stress corrosion cracking is |
| A. | intergranular cracking |
| B. | transgranular cracking |
| C. | slow cracking |
| D. | none of the above |
| Answer» B. transgranular cracking | |
| 327. |
corrosion fatigue cracking is a combined effect of |
| A. | strain and corrosion |
| B. | stress and corrosion |
| C. | cyclic stress and corrosion |
| D. | none of the above |
| Answer» D. none of the above | |
| 328. |
stress corrosion cracking is a combined effect of |
| A. | temperature and time |
| B. | velocity and fluid |
| C. | acidity and stress |
| D. | corrosive environment and mechanical stresses |
| Answer» E. | |
| 329. |
one of the following is the remedial measure to control or prevent impingemnet corrosion |
| A. | selection of good resistant metal |
| B. | filtering out the solid particles while entering he system |
| C. | installation of water traps or wear plates and baffles in the path |
| D. | all of the above |
| Answer» E. | |
| 330. |
the corrosion profile of erosion corrosion shows |
| A. | a smoooth surface profile with directional pattern |
| B. | very rough surface with groves |
| C. | very shiny surface |
| D. | all of the above |
| Answer» B. very rough surface with groves | |
| 331. |
hard particles or asnd particels in a flowing fluid, causes which type of corrosion |
| A. | cavitation corrosion |
| B. | erosion corrosion |
| C. | impingement corrosion |
| D. | none of the above |
| Answer» D. none of the above | |
| 332. |
out of the following is the measure to control erosion corrosion |
| A. | selection of resistant materials |
| B. | decreasing the flow velocity |
| C. | minimizing turebulence |
| D. | all of the above |
| Answer» E. | |
| 333. |
the rate of erosion corrosion is vary with the velocity of fluid i.e thed velocity of fluid is high. The statement stated is |
| A. | false |
| B. | true |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 334. |
one of the following is velocity related attack , due to fluid flow |
| A. | cavitation corrosion |
| B. | uniform corrosion |
| C. | bimetal corrosion |
| D. | intergranular corrosion |
| Answer» B. uniform corrosion | |
| 335. |
erosion corrosion can be defined as |
| A. | the precipitation of hard carbides at grain boundary |
| B. | corrosion reaction which accelerated by the relative movement between a corrosive fluid and the metal surface |
| C. | corrosion reaction due to bubbles flowing through the fluid gets burst |
| D. | none of the above |
| Answer» E. | |
| 336. |
one of the following is a velocity related corrosion attack, due to fluid flow |
| A. | impingement corrosion |
| B. | crevice corrosion |
| C. | bimetal corrosion |
| D. | general corrosion |
| Answer» B. crevice corrosion | |
| 337. |
one of the following is a velocity related corrosion attack in the pipeline |
| A. | general corrosion |
| B. | galvanic corrosion |
| C. | intergranular corrosion |
| D. | none of the above |
| Answer» E. | |
| 338. |
which of the following ia a velocity related corrosion attack? |
| A. | impingement corrosion |
| B. | cavitation corrosion |
| C. | erosion corrosion |
| D. | all of the above |
| Answer» E. | |
| 339. |
knife line attack is which type of corrosion ? |
| A. | bimetal corrosion |
| B. | general corrosion |
| C. | intergranular corrosion |
| D. | all of the above |
| Answer» D. all of the above | |
| 340. |
what is meant by K.L.A. |
| A. | kinetic low alloy |
| B. | knife low alloy |
| C. | knife line alloy |
| D. | knife line attack |
| Answer» E. | |
| 341. |
one of the following step is used to control intergranular corrosion in stainless steel |
| A. | use of metal coating, like electroplatin g |
| B. | use of stabilized grade of stinless steel i.e. (321, 322 grade) |
| C. | use of special type of inhibitor |
| D. | all of the above |
| Answer» C. use of special type of inhibitor | |
| 342. |
one of the following is the preventive measure for intergranular corrosion |
| A. | use of low carbon grade os stainless steel (304l, 316l grade) |
| B. | use of stabilised grade of stainless steel (321 or 322 grade) |
| C. | use post weld heat treatment |
| D. | all of the above |
| Answer» E. | |
| 343. |
when grain voundary becomes sucseptible to corrosion, due to chromium carbide in stainles steel, this stage of metal is known as |
| A. | graphitizatio n |
| B. | chromitizatio n |
| C. | sensitization |
| D. | none of the above |
| Answer» D. none of the above | |
| 344. |
in case of intergranular corrosion, when grain boundary become ric in chromium then the % of chromium at the depleted region will become |
| A. | lower than 12% |
| B. | more than 12% |
| C. | equal to 12% |
| D. | none of the above |
| Answer» B. more than 12% | |
| 345. |
the chemical formula for chromium carbide which precipitate at grain boundary due to sensitization is |
| A. | cr23c6 |
| B. | cr21c5 |
| C. | cr20c2 |
| D. | cr0c0 |
| Answer» B. cr21c5 | |
| 346. |
which of the following element precipitate on grain boundary, when stainless steel gets sensitized ? |
| A. | vanadium carbide |
| B. | molybdenum carbide |
| C. | tungsten carbide |
| D. | chromium carbide |
| Answer» E. | |
| 347. |
in case of stainless steels, which type of following effect is seen after welding |
| A. | grantization |
| B. | sensitization |
| C. | graphitizatio n |
| D. | none of the above |
| Answer» C. graphitizatio n | |
| 348. |
which of the following remedial measure is suitable to prevent crevice corrosion |
| A. | avoid joining of metal rivets and bolts. use welding |
| B. | avoid solution get into crevice by applying grease |
| C. | routine cleaning must be carried out |
| D. | all of the above |
| Answer» E. | |
| 349. |
intergranular corrosion take place at which portion of grain |
| A. | phases in the grain |
| B. | inclusions in the grain |
| C. | grain boundary |
| D. | twin boundary |
| Answer» D. twin boundary | |
| 350. |
crevice corrosion is also a localized attack, the statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. false | |