A. Increase
B. Decrease
C. Remain same
D. May increase or decrease; depending on the type of metal
Related Mcqs:
- Corrosion of metals cannot be prevented by its__________________?
A. Tempering
B. Chromising
C. Aluminising
D. Alloying - In connection with corrosion of metals, passivation is the process that__________________?
A. Intensifies deterioration
B. Changes the composition of the metal
C. Inhibits further deterioration
D. None of these - Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?
A. 5
B. 10
C. 20
D. 35 - Out of the following, the ________________ pipe has the least corrosion resistance?
A. Mild steel
B. Copper
C. Cast iron
D. Wrought iron - _____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?
A. Veneering
B. Galvanising
C. Electroplating
D. Calorising - Corrosion rate cannot be lowered by reducing the ________________ of the corroding medium?
A. Concentration
B. Velocity
C. Temperature
D. None of these - The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the_______________?
A. Water alkalinity & leakage
B. Hydrazine addition during feed water treatment
C. Release of non-condensable gas from water in the boiler
D. Scale formation - Electrochemical corrosion can occur, only if ________________ is present in contact with metal?
A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium - A form of stress corrosion failure termed as ‘season cracking’ is generally observed in __________________?
A. Thermosetting polymers
B. High carbon steels
C. Brasses
D. Borosilicate glasses - Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
A. Lower cost
B. Abundant availability
C. Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
D. None of these
