Related Questions

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
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
A Thermosphere
B Stratosphere
C Troposphere
D Mesosphere
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
A Less
B More
C Equal
D May be less or more depending on temperature
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
A CO
B SO2
C NOx
D CFC (chloro fluoro carbons)
A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.
A Sump
B Volute
C Vacuum
D Submerged
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.
A Sulphur
B Phosphorus
C Manganese
D Silicon
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
Which of the following is the most prone to atmospheric corrosion?
A Silver
B Iron
C Tin
D Copper
Corrosion involves exchange of electrons in __________ corrosion.
A Chemical
B Electrochemical
C Both A & B
D Neither A nor B
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

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