A. Tempering
B. Chromising
C. Aluminising
D. Alloying
Related Mcqs:
- 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 - With increase in impurities in metals, their corrosion resistances____________________?
A. Increase
B. Decrease
C. Remain same
D. May increase or decrease; depending on the type of metal - Corrosion rate cannot be lowered by reducing the ________________ of the corroding medium?
A. Concentration
B. Velocity
C. Temperature
D. None of these - Which of the following metals cannot be hot worked at room temperature ?
A. Zinc
B. Nickel
C. Lead
D. Tin - Nitriding of a steel part does not increase its__________________?
A. Grain size
B. Fatigue limit
C. Surface hardness
D. Wear resistance - The best guide to judge the general quality of water is the measurement of its__________________?
A. pH value
B. Electrical conductivity
C. Turbidity
D. Dissolved oxygen content - Primary designation of steel is based on its__________________?
A. Hardness & tensile strength
B. Carbon content
C. Iron content
D. Alloying elements content - 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 - 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
