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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.
| 451. |
in stress corrosion cracking |
| A. | only internal stresses are |
| B. | only extrenal stresses are |
| C. | only residual stres are |
| D. | all of the above |
| Answer» E. | |
| 452. |
the type of corrosion which is produced by con=mbined effect of mechanical stress and a corrosive environment on metal is called as |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 453. |
sensitized stainless steel are |
| A. | prone to corroiosn |
| B. | protected against corrosion |
| C. | not related with corrosion |
| D. | none of the above |
| Answer» B. protected against corrosion | |
| 454. |
sensitized stainless steel means |
| A. | group of steel prone to corrosion in welding in the range of 500 to 800 oc |
| B. | group of steel prone to corrosion in welding below 500 oc |
| C. | group of steel prone to corrosion in welding above 800 oc |
| D. | none of the above |
| Answer» B. group of steel prone to corrosion in welding below 500 oc | |
| 455. |
in stainless steel the precipitation of Cr carbides leads to |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 456. |
in intergranular corrosion |
| A. | grain acts as cathode |
| B. | gb acts as cathode |
| C. | gb acts as anode |
| D. | both a and c |
| Answer» E. | |
| 457. |
out of the following sentences which sentence is not true for pitting corrosion ? |
| A. | brake in protective caotings |
| B. | destruction of passive layer |
| C. | insufficient use of anodic inibitor |
| D. | none uniform heat treatment |
| Answer» E. | |
| 458. |
in oxygen absorption reaction mechnism os corroison |
| A. | cathode usually have large areas than anode |
| B. | anode usually have large areas than cathode |
| C. | anodes and cathodes are same |
| D. | none of the above is right |
| Answer» B. anode usually have large areas than cathode | |
| 459. |
scratches, local straining of metal due to non- uniform stresses, sliding uncer load leads to |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» B. stress corrosion cracking | |
| 460. |
in dissolved oxygen content of electrolyte has              effect on corrosion reaction |
| A. | it forces the cathodic reaction to the right i.e. producing more oh- ions |
| B. | it removes more electrons and therefore accelarate the corrosion at the anode |
| C. | both are true sentenses |
| D. | none of the above is right |
| Answer» D. none of the above is right | |
| 461. |
H2O + (1/2) O2 + 2e-1 --> 2OH- (Reduction) is reaction taking plcae at               --- |
| A. | cathode |
| B. | anode |
| C. | both a and b |
| D. | none of the above |
| Answer» B. anode | |
| 462. |
due to non uniform and rapid cooling, welding, poor design, precipitation of second phase material leads to |
| A. | crevice corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 463. |
In Cu alloys season cracking is a type of |
| A. | crevice corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 464. |
stress corrosion cracking can be reduced by |
| A. | eleminating the internal stresses with the help of heat treatment like stress- relief annealing or full annealing |
| B. | by taking proper manufacturin g process |
| C. | by using suitable material for suitable composition |
| D. | none of the above |
| Answer» B. by taking proper manufacturin g process | |
| 465. |
residual stresses in materis leads to |
| A. | stress corrosion cracking |
| B. | crevice corrosion |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» B. crevice corrosion | |
| 466. |
stainless steels are preone to |
| A. | stress corrosion cracking |
| B. | crevice corrosion |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» D. erosion corrosion | |
| 467. |
due to difference in electrode potential at grain and grain boundaries the type of corrosion which take place is known as               - |
| A. | stress corrosion cracking |
| B. | crevice corrosion |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» D. erosion corrosion | |
| 468. |
intergranular corroison occurs |
| A. | along the garin boundaries |
| B. | within the grains |
| C. | any where within the material |
| D. | none of the above |
| Answer» B. within the grains | |
| 469. |
the type of corrosion occurs in granular metals and in homogeneous alloys is known as |
| A. | stress corrosion cracking |
| B. | crevice corrosion |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» D. erosion corrosion | |
| 470. |
pitting corrosion can occur under the following conditions |
| A. | due to brake in protective coatings |
| B. | due to destruction of passive layer |
| C. | insufficient use of anodic inibitor |
| D. | all of the above |
| Answer» E. | |
| 471. |
due to brakege of protective film the type of corrosion which takes palce is known as |
| A. | stress corrosion cracking |
| B. | pitting corrosion |
| C. | crevice corrosion |
| D. | erosion corrosion |
| Answer» C. crevice corrosion | |
| 472. |
formation of small anodic and large cathodic areas is a charatcristics of |
| A. | stress corrosion cracking |
| B. | pitting corrosion |
| C. | crevice corrosion |
| D. | erosion corrosion |
| Answer» C. crevice corrosion | |
| 473. |
due to formation of pinholes, pits and cavities in the metal, the type of corrosion which takes place is known as |
| A. | stress corrosion cracking |
| B. | pitting corrosion |
| C. | crevice corrosion |
| D. | erosion corrosion |
| Answer» C. crevice corrosion | |
| 474. |
when electrolyte is neutral acqueous solution or alkaline solution, the type of corrosion takes place is known as |
| A. | hydrogen evolution |
| B. | oxyfen absorption |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 475. |
in hydrogen evolution mechanism of corroison |
| A. | cathode usually have large areas than anode |
| B. | anode usually have large areas than cathode |
| C. | anodes and cathodes are same |
| D. | none of the above |
| Answer» C. anodes and cathodes are same | |
| 476. |
all metal above hydrogen in electrochemical series will have tendency to get corroded by |
| A. | hydrogen evolution |
| B. | oxyfen absorption |
| C. | both a and b |
| D. | none of the above |
| Answer» B. oxyfen absorption | |
| 477. |
Fe + 2H+ = Fe+2 + H2 is chemical reaction in |
| A. | hydrogen evolution |
| B. | oxyfen absorption |
| C. | both a and b |
| D. | none of the above |
| Answer» B. oxyfen absorption | |
| 478. |
usually in acidic environments like industrial watse, solution of non-oxidising acids the corrosion take place by |
| A. | hydrogen evolution |
| B. | oxyfen absorption |
| C. | both a and b |
| D. | none of the above |
| Answer» B. oxyfen absorption | |
| 479. |
dissolution of metal as corressponding metal ions with liberatoin of electrons is known as |
| A. | anodic reaction |
| B. | cathodic reaction |
| C. | oxidation |
| D. | both a and c |
| Answer» E. | |
| 480. |
M --> M+ + e- is chemical reaction which is |
| A. | anodic reaction |
| B. | cathodic reaction |
| C. | oxidation |
| D. | both a and c |
| Answer» E. | |
| 481. |
in corroison at anodic area |
| A. | there is liberation of free electrons |
| B. | oxidation take place |
| C. | there is tendency to destroy the metal |
| D. | all of the above |
| Answer» E. | |
| 482. |
electrode potential of metal depends upon |
| A. | chemical nature of metal |
| B. | nature of solution in which metal is immmersed |
| C. | temperature of the solution to some extent |
| D. | all of the above |
| Answer» E. | |
| 483. |
more negative electrode potential of metal indicates |
| A. | higher probability of corrosion |
| B. | lower probability of corrosion |
| C. | both a and b |
| D. | none of the above |
| Answer» B. lower probability of corrosion | |
| 484. |
in corrosion at cathodic area |
| A. | there is gain of electrons |
| B. | reduction takes palce |
| C. | usually metal do not get affected |
| D. | all of the above |
| Answer» E. | |
| 485. |
wet corroison occurs under                 conditions |
| A. | when conducting liquid is in contact with metal |
| B. | when two dissimilar metals are immersed in aqueous |
| C. | single metals is dipped partially in aqueous solution of |
| D. | all of the above |
| Answer» E. | |
| 486. |
in conducting corrosion the intensity of corrosion depends on |
| A. | electronic and ionic conductivitie s of the film |
| B. | type of electrons |
| C. | type of atmosphere |
| D. | none of the above |
| Answer» B. type of electrons | |
| 487. |
 the type of corrosion which takes place due to electrochemical reaction is known as |
| A. | dry corrosion |
| B. | wet corroison |
| C. | none of the above |
| D. | all of the above |
| Answer» C. none of the above | |
| 488. |
the common example of direct corrosion is |
| A. | rusting of iron and steel |
| B. | corrosion of copper flashing in steel |
| C. | tarnishing of silverware |
| D. | all of the above |
| Answer» E. | |
| 489. |
in case of dry corroison if the protective film formed is porous |
| A. | it gives good protection |
| B. | it gives bad protection |
| C. | no where it is related to corrosion resistance |
| D. | none of the above |
| Answer» B. it gives bad protection | |
| 490. |
the extent of dry corrosion depends on |
| A. | chemical affinity between the environment |
| B. | adheshion between the film and metal surface |
| C. | both a and b |
| D. | none of the above |
| Answer» D. none of the above | |
| 491. |
the corrosion which occurs due to chemical reaction between metal and atmospheric gases is known as |
| A. | atmospheric corrosion |
| B. | dry corrosion |
| C. | both a and b |
| D. | wet corrosion |
| Answer» D. wet corrosion | |
| 492. |
destruction of metal through unwanted or unintentional chemical or electrochemical reaction is known as |
| A. | erosion |
| B. | corrosion |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 493. |
Radioactive decay of radium and salt will cause generation of |
| A. | ultrasonic waves |
| B. | magnetic waves |
| C. | gamma rays |
| D. | x-rays and gamma rays |
| Answer» D. x-rays and gamma rays | |
| 494. |
X-rays are produced by stricking |
| A. | agains t surface defect |
| B. | electrons against anode |
| C. | magnetic field material |
| D. | electrons against cathode |
| Answer» C. magnetic field material | |
| 495. |
DC is used in magnaflux test to detect |
| A. | surface |
| B. | surface and surface |
| C. | internal |
| D. | sub surface |
| Answer» E. | |
| 496. |
AC is used in magnaflux test to detect |
| A. | surface defect |
| B. | surface and sub surface defect |
| C. | internal defects |
| D. | subsurface defect |
| Answer» B. surface and sub surface defect | |
| 497. |
Flouroscent is used in NDT |
| A. | ultrasonic |
| B. | eddy current |
| C. | radiography |
| D. | dye penetrant and magnaflu x |
| Answer» E. | |
| 498. |
Electric current is not used in NDT |
| A. | ultrasonic |
| B. | magnaflux |
| C. | eddy current |
| D. | dye penetrant |
| Answer» E. | |
| 499. |
Quartz is used in NDT |
| A. | ultrasonic |
| B. | magnaflux |
| C. | radiography |
| D. | dye penetrant |
| Answer» B. magnaflux | |
| 500. |
Measurement of the electric cunductivity of silver plated electrical contact is possible by |
| A. | magna flux test |
| B. | eddy current test |
| C. | ultrasonic test |
| D. | both b and c |
| Answer» C. ultrasonic test | |