FREE Fundamentals of Engineering MCQ Questions and Answers
Until a steel contains at least what percentage of chromium, can it be eligible for the stainless prefix?
Stainless steel is a type of steel that contains a minimum of 10% chromium. Chromium is added to steel to enhance its corrosion resistance and other properties. Therefore, a steel cannot be classified as stainless steel unless it has at least 10% chromium content.
What tension test is designated for ASTM standard procedures for steel products?
ASTM test A370 is designated for standard methods of tension testing for steel products. This test determines the mechanical properties of steel, including yield strength, tensile strength, elongation, and reduction of area. It is used to ensure the quality and performance of steel products in various industries such as construction and manufacturing.
Utilizing acids to eliminate scale and oxides from hot-worked steels is referred to as
The use of acids to remove oxides and scale on hot-worked steels is known as picking.
What do you add to make up for the steel's residually high iron-oxide content?
To compensate for the remaining high iron-oxide content of the steel, deoxidizers are added. Deoxidizers are substances that react with the iron oxide and remove it from the steel, reducing the oxygen content. This helps in improving the quality and properties of the steel by reducing the presence of impurities.
Which kind of steel uses carbon as its main strengthening agent?
Carbon steel is a type of steel that has carbon as its principal hardening agent. The carbon content in carbon steel is typically between 0.05% and 2.0%, which gives it its hardness and strength. The higher the carbon content, the harder and stronger the steel becomes. Carbon steel is commonly used in various industries due to its durability, affordability, and versatility. It is used in the construction of buildings, bridges, tools, machinery, and automotive parts, among other applications.
Which kind of steel is 100% pearlite and contains 0.8% carbon?
The type of steel that has 0.8% carbon and 100% pearlite is eutectoid. Eutectoid steel is a type of steel that has a specific composition and undergoes a specific transformation known as eutectoid reaction. In this reaction, the steel transforms from austenite to pearlite when it is cooled. The pearlite structure consists of alternating layers of ferrite and cementite, and in eutectoid steel, the entire microstructure is composed of pearlite.
What's the name for a polymer with characteristics similar to rubber?
An elastomer is a type of polymer that exhibits rubber-like properties, such as high elasticity and flexibility. It can be stretched and deformed easily, and then returns to its original shape when the force is removed. Elastomers are commonly used in applications that require resilience and durability, such as rubber bands, tires, and seals. Unlike plastics, which are rigid and brittle, elastomers have a higher degree of cross-linking in their molecular structure, allowing them to stretch and recover without permanent deformation. Copolymers and polymers are broader terms that encompass a wider range of materials, whereas elastomer specifically refers to rubber-like polymers.
A big molecule made up of two alternating mers is called
A large molecule with two alternating mers is known as copolymers. Copolymers are a type of polymer that consists of two or more different monomers. These monomers are arranged in an alternating pattern, forming a large molecule with distinct properties. Copolymers are widely used in various applications due to their unique combination of properties derived from different monomers.
The direct transformation from
Sublimation is the process in which a solid directly changes into a gas without passing through the liquid phase. This occurs when the substance's vapor pressure exceeds its melting point or when the surrounding pressure is lower than the substance's triple point pressure. Therefore, the correct answer is "Solid to gaseous phase."
Without a coating, what is tin mill steel called?
Black plate refers to tin mill steel that does not have a coating. It is called black plate because it appears black in color due to the absence of any coating. This type of steel is often used in applications where a coating is not necessary or desired, such as in the manufacturing of cans or containers.
Products made of steel that have been coated with
Galvanized steel refers to steel products that have been coated with zinc. This coating provides protection against corrosion and rust, making the steel more durable and long-lasting. Zinc is chosen for this purpose because it has excellent corrosion resistance properties and forms a protective barrier on the surface of the steel. This helps to prevent the steel from coming into direct contact with moisture and other elements that can cause it to deteriorate over time.