1. The melting point of steel is ___________
a) 1220°F
b) 670°F
c) 3272°F
d) 2500°F
Explanation: The melting point of steel is usually around 2500° Fahrenheit. The melting points of materials differ. For example, the melting point of aluminium is 1220°F and that of titanium is around 3272°F
2. Steel is a material that is primarily made with __________ and __________
a) titanium, carbon
b) chromium, iron
c) iron, carbon
d) iron, titanium
Explanation: Steel is a material that is made by combining several metals to obtain several types of physical characteristics. Primarily, both iron and carbon are important for this process along with other elements in minute quantities.
3. ___________ is a harmful property in the material.
a) Carbon
b) Silicon
c) Sulphur
d) Manganese
Explanation: There are certain elements that are good to metal steel while there are some elements that are not good for it. Sulphur is an element that is harmful and is best kept in low quantities. So it is phosphorous.
4. It is possible to make a ____________ number of steels.
a) huge
b) certain
c) specified
d) couple of
Explanation: Steel is basically a combination of different metals that result in different types of physical characteristics. It is possible to make an infinite number of steels because iron combines with a huge number of elements.
5. Iron combines easily with ___________ to make iron carbide.
a) manganese
b) carbon
c) steel
d) chromium
Explanation: Iron combines easily with carbon and results in iron carbide. It is also known as cementite. The greater the amount of carbon, the greater the amount of ultimate strength and hardness. But, ductility decreases.
6. Steels that are resistant to corrosion have high amounts of __________
a) manganese
b) iron
c) chromium
d) carbon
Explanation: The steels that are resistant to corrosion are made with high amounts of chromium. They also tend to be non-magnetic in nature with a few exceptions. Chromium can also be combined with other metals to form alloys.
7. Around ___________ types of steels are used in constructing an aircraft.
a) 5
b) 13
c) 59
d) 20
Explanation: Steels are widely used in the aerospace industry and in particular the construction of aircraft. They are used in making brace struts, landing gear, wings etc. Around 20 types of steels are used.
8. In steel, manganese is helpful in __________
a) heating
b) shine
c) deoxidize
d) volume
Explanation: Manganese is a useful element for steel. It particularly helps in deoxidizing and desulphurizing the material. This makes the metal tough. It also helps in the forging process of metal steel.
9. An extra quantity of more than ___ % of manganese will heighten brittleness of the metal.
a) 5
b) 1
c) 44
d) 13
Explanation: An extra quantity that is not required of more than one percent can make the material extra brittle. Manganese is advantageous when added in the right amount. It is also none magnetic in nature.
10. Steels made of nickel typically contain _______ to _____ % of nickel.
a) 23 to 56
b) 10 to 20
c) 8 to 19
d) 3 to 5
Explanation: Steels made of nickel contain around three to five percent of nickel. Nickel is a white colored metal and is malleable and ductile in its original pure state. Adding the element nickel heightens strength and hardness.