McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 751. |
Response of eddy current is depends upon |
| A. | magnetic permeability |
| B. | electrical conductivity |
| C. | structural defects |
| D. | all of the above |
| Answer» D. all of the above | |
| 752. |
The result can be recorded by permanently in |
| A. | magnaflux test |
| B. | eddy current test |
| C. | dye penetrant test |
| D. | radiography |
| Answer» D. radiography | |
| 753. |
The crack depth measurement is possible in |
| A. | magnaflux test |
| B. | eddy current test |
| C. | ultrasonic test |
| D. | both b and c |
| Answer» D. both b and c | |
| 754. |
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» B. eddy current test | |
| 755. |
Quartz is used in NDT |
| A. | ultrasonic |
| B. | magnaflux |
| C. | radiography |
| D. | dye penetrant |
| Answer» A. ultrasonic | |
| 756. |
Flouroscent is used in NDT |
| A. | ultrasonic |
| B. | eddy current |
| C. | radiography |
| D. | dye penetrant and magnaflu x |
| Answer» D. dye penetrant and magnaflu x | |
| 757. |
Electric current is not used in NDT |
| A. | ultrasonic |
| B. | magnaflux |
| C. | eddy current |
| D. | dye penetrant |
| Answer» D. dye penetrant | |
| 758. |
AC is used in magnaflux test to detect |
| A. | surface defect |
| B. | surface and sub surface defect |
| C. | internal defects |
| D. | subsurface defect |
| Answer» A. surface defect | |
| 759. |
DC is used in magnaflux test to detect |
| A. | surface |
| B. | surface and surface |
| C. | internal |
| D. | sub surface |
| Answer» D. sub surface | |
| 760. |
X-rays are produced by stricking |
| A. | agains t surface defect |
| B. | electrons against anode |
| C. | magnetic field material |
| D. | electrons against cathode |
| Answer» B. electrons against anode | |
| 761. |
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» C. gamma rays | |
| 762. |
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» B. corrosion | |
| 763. |
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» C. both a and b | |
| 764. |
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» C. both a and b | |
| 765. |
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» A. it gives good protection | |
| 766. |
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» A. electronic and ionic conductivitie s of the film | |
| 767. |
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» D. all of the above | |
| 768. |
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» B. wet corroison | |
| 769. |
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» D. all of the above | |
| 770. |
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» D. all of the above | |
| 771. |
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» D. all of the above | |
| 772. |
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» D. all of the above | |
| 773. |
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» A. higher probability of corrosion | |
| 774. |
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» D. both a and c | |
| 775. |
M --> M+ + e- is chemical reaction which is |
| A. | anodic reaction |
| B. | cathodic reaction |
| C. | oxidation |
| D. | both a and c |
| Answer» D. both a and c | |
| 776. |
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» A. hydrogen evolution | |
| 777. |
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» A. hydrogen evolution | |
| 778. |
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» A. hydrogen evolution | |
| 779. |
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» B. anode usually have large areas than cathode | |
| 780. |
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» B. oxyfen absorption | |
| 781. |
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» B. pitting corrosion | |
| 782. |
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» B. pitting corrosion | |
| 783. |
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» B. pitting corrosion | |
| 784. |
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» D. all of the above | |
| 785. |
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» C. intergranular corrosion | |
| 786. |
intergranular corroison occurs |
| A. | along the garin boundaries |
| B. | within the grains |
| C. | any where within the material |
| D. | none of the above |
| Answer» A. along the garin boundaries | |
| 787. |
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» C. intergranular corrosion | |
| 788. |
stainless steels are preone to |
| A. | stress corrosion cracking |
| B. | crevice corrosion |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 789. |
residual stresses in materis leads to |
| A. | stress corrosion cracking |
| B. | crevice corrosion |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» A. stress corrosion cracking | |
| 790. |
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» B. stress corrosion cracking | |
| 791. |
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» A. eleminating the internal stresses with the help of heat treatment like stress- relief annealing or full annealing | |
| 792. |
In Cu alloys season cracking is a type of |
| A. | crevice corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» B. stress corrosion cracking | |
| 793. |
H2O + (1/2) O2 + 2e-1 --> 2OH-
|
| A. | cathode |
| B. | anode |
| C. | both a and b |
| D. | none of the above |
| Answer» A. cathode | |
| 794. |
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» C. both are true sentenses | |
| 795. |
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» A. cathode usually have large areas than anode | |
| 796. |
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» A. pitting corrosion | |
| 797. |
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» D. none uniform heat treatment | |
| 798. |
in intergranular corrosion |
| A. | grain acts as cathode |
| B. | gb acts as cathode |
| C. | gb acts as anode |
| D. | both a and c |
| Answer» D. both a and c | |
| 799. |
in stainless steel the precipitation of Cr carbides leads to |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» B. stress corrosion cracking | |
| 800. |
sensitized stainless steel are |
| A. | prone to corroiosn |
| B. | protected against corrosion |
| C. | not related with corrosion |
| D. | none of the above |
| Answer» A. prone to corroiosn | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.