1. Wear resistance of an alloy steel can be improved by adding ___________
a) Tungsten
b) Vanadium
c) Manganese
d) Titanium
Explanation: Manganese is normally present in all commercial steels. High levels of manganese presence produces an austenitic steel with improved wear and abrasion resistance.
2. Corrosion resistance of an alloy steel can be improved by adding __________
a) Tungsten
b) Vanadium
c) Chromium
d) Titanium
Explanation: Chromium when added in the range 10.5%-18% in weight to steel, forms a passive oxide layer (Cr2O3), thus transforming steel to a corrosion resistant steel (stainless steel).
3. Tensile strength of an alloy steel can be improved by adding ____________
a) Nickel
b) Vanadium
c) Manganese
d) Titanium
Explanation: Nickel can improve tensile strength as well as toughness of alloy steel. Small additions of niobium (Nb) also increases the tensile strength of carbon steel
4. Which of the following induces fine grain distribution in alloy steel?
a) Nickel
b) Vanadium
c) Manganese
d) Titanium
Explanation: After Al, vanadium if by far the mostly used grain refiner in steel. It forms a microscopic precipitate particle in steel, which acts as pinning agents, thus obstruct the grain growth at higher temperatures, encouraging new grains to nucleate.
5. Alloy of copper and zinc is known as _____
a) Brass
b) Bronze
c) Duralumin
d) Nichrome
Explanation: Brass is a substitutional alloy of copper and zinc. It has many useful properties, such as low melting point, workability, electrical conductivity and thermal conductivity, corrosion resistance, etc.
6. Alloy of Ni and Fe is termed as ___________
a) Brass
b) Bronze
c) Duralumin
d) Invar
Explanation: Invar is an alloy of nickel and iron generically known as FeNi36. It has low thermal expansion coefficient.
7. Major constituent of the gun metal is ____________
a) Copper
b) Nickel
c) Iron
d) Zinc
Explanation: Gun metal (also known as red brass) contains 83% Cu and 2% Zn and 10% Sn.
8. Major constituent of Muntz metal is _____
a) Copper
b) Nickel
c) Iron
d) Zinc
Explanation: Mutz metal contains 60% Cu and 40% Zn. It is commonly used in architectural applications.
9. Major constituent of the Nichrome is _____________
a) Copper
b) Nickel
c) Iron
d) Zinc
Explanation: Nichrome contains 80% Ni and 20% Cr. Nichrome mostly used as a resistant wire and in dental fillings.
10. Major constituent of Constantan alloy is ___________
a) Copper
b) Nickel
c) Iron
d) Zinc
Explanation: Constantan (also known as Eureka/Ferry) contains 60% Cu and 40% Ni. It finds its mainly in thermocouples and has strong negative seebeck coefficient above 0oC.