Free Fundamentals of Engineering MCQ Questions and Answers — Questions and Answers

Question 1: What tension test is designated for ASTM standard procedures for steel products?

J564
J789
F456
A370 (Correct answer)

Correct answer: A370

ASTM A370 is the designated standard procedure for the mechanical testing of steel products, including tension tests. This standard outlines the specific methods, definitions, and requirements for conducting various mechanical tests on steel, ensuring consistency and comparability of results across the industry. It is crucial for quality control and material specification in engineering applications involving steel.

Question 2: A big molecule made up of two alternating mers is called

Copolymers (Correct answer)
Polymers
Poly
Plastics

Correct answer: Copolymers

A copolymer is a large molecule, or polymer, that is made up of two or more different types of monomer units, often referred to as 'mers,' arranged in an alternating or random sequence. This contrasts with homopolymers, which are composed of only one type of monomer. The combination of different mers allows for a wide range of material properties to be achieved.

Question 3: What's the name for a polymer with characteristics similar to rubber?

Copolymers
Polymers
Elastomer (Correct answer)
Plastics

Correct answer: Elastomer

An elastomer is a polymer that possesses elastic properties, meaning it can undergo significant deformation under stress and then return to its original shape once the stress is removed. This characteristic is similar to that of natural rubber, making elastomers widely used in applications requiring flexibility and resilience, such as tires, seals, and shock absorbers.

Question 4: Which kind of steel uses carbon as its main strengthening agent?

Alloy
Iron Carbon
Iron steel
Carbon Steel (Correct answer)

Correct answer: Carbon Steel

Carbon steel is a type of steel where carbon is the primary alloying element used to enhance its strength and hardness. The mechanical properties of carbon steel, such as tensile strength and ductility, are largely determined by its carbon content. As the carbon percentage increases, the steel generally becomes harder and stronger but less ductile.

Question 5: Which kind of steel is 100% pearlite and contains 0.8% carbon?

Nuclei
Duetoic
Eutectoid (Correct answer)
Deutectoid

Correct answer: Eutectoid

Eutectoid steel is a specific type of carbon steel that contains approximately 0.76% (often rounded to 0.8%) carbon. Upon slow cooling from its austenitic phase, this steel transforms entirely into pearlite, which is a lamellar microstructure consisting of alternating layers of ferrite and cementite. This unique composition and transformation give eutectoid steel distinct mechanical properties.

Question 6: Products made of steel that have been coated with

Silicon
Boron
Zinc (Correct answer)
Iron

Correct answer: Zinc

Steel products are often coated with zinc through a process called galvanization to protect them from corrosion. Zinc acts as a sacrificial coating, corroding preferentially to the steel and forming a protective layer of zinc oxides and carbonates that prevents the underlying steel from rusting. This significantly extends the lifespan of steel structures and components.

Question 7: Utilizing acids to eliminate scale and oxides from hot-worked steels is referred to as

Picking (Correct answer)
Adding
Pulling
Pushing

Correct answer: Picking

The process of utilizing acids to eliminate scale, rust, and oxides from the surface of hot-worked steels is known as pickling. This chemical treatment prepares the steel surface for further processing, such as galvanizing, painting, or plating, by ensuring a clean and uniform finish. The acid solution dissolves the undesirable surface contaminants, leaving behind a clean metal surface.

Question 8: Without a coating, what is tin mill steel called?

Coating
Black plate (Correct answer)
Solid plate
Cladding

Correct answer: Black plate

Tin mill steel, when produced without any coating, is referred to as black plate. This uncoated steel sheet is typically thin and used as a base material before further processing, such as tin plating to create tinplate or chromium plating to create tin-free steel. The term 'black' refers to its appearance before any surface treatment.

Question 9: Until a steel contains at least what percentage of chromium, can it be eligible for the stainless prefix?

12&
15&
10% (Correct answer)
3%

Correct answer: 10%

For a steel to be eligible for the 'stainless' prefix, it must contain a minimum of 10% (or more precisely, 10.5%) chromium by mass. Chromium forms a passive, self-repairing oxide layer on the steel's surface, which provides its characteristic corrosion resistance. This protective layer is what distinguishes stainless steel from other types of steel.

Question 10: What do you add to make up for the steel's residually high iron-oxide content?

Oxiders
Oxide
Deoxidizers (Correct answer)
Oxidizers

Correct answer: Deoxidizers

Deoxidizers are substances added to molten steel to reduce its residually high iron-oxide content by removing dissolved oxygen. Oxygen can lead to defects like porosity and inclusions in the final steel product. Common deoxidizers include silicon, manganese, and aluminum, which react with oxygen to form stable oxides that can be removed as slag.

Question 11: The direct transformation from

Gas to liquid phase
Liquid to solid phase
Liquid to gas phase
Solid to gaseous phase (Correct answer)

Correct answer: Solid to gaseous phase

Sublimation is the phase transition of a substance directly from the solid to the gaseous phase without passing through the intermediate liquid phase. This process occurs when a substance absorbs enough energy to overcome the intermolecular forces holding it in a solid state, allowing its molecules to escape directly into the gas phase. A common example is dry ice (solid carbon dioxide) sublimating into gaseous carbon dioxide.

Free Fundamentals of Engineering MCQ Questions and Answers

What tension test is designated for ASTM standard procedures for steel products?