Engineering Materials MCQ Questions & Answers | Mechanical Engineering

Most cast irons have a chemical composition of 2.5 - 4.0% carbon, 1 - 3% silicon, and the remainder iron.
Grey cast iron has less tensile strength and shock resistance than steel, but its compressive strength is comparable to low- and medium-carbon steel.

Dye penetrant inspection is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics or ceramics).

The material widely used for making pendulums of clocks is Nickel steel.
Nickel enhances important properties of stainless steel such as formability, weldability and ductility, while increasing corrosion resistance in certain applications.

Taps dies and drills contain carbon Above 1%

Solder is a fusible metal alloy used to join together metal workpieces, typically in electronics and plumbing applications.

The most common type of solder is made from a combination of tin (Sn) and lead (Pb).

Tin provides good wettability, allowing the solder to flow easily and bond with the base metals.

Lead lowers the melting point of the alloy, making it easier to melt and apply during soldering.

Typical solder compositions include 60% tin and 40% lead (60/40 solder), or 63% tin and 37% lead (eutectic solder).

Therefore, the correct answer is: Tin and lead.

Malleable iron is cast as white iron, the structure being a metastable carbide in a pearlitic matrix.
Through an annealing heat treatment, the brittle structure as first cast is transformed into the malleable form.

Bell metal contains 70 - 75% copper and rest tin

Normalizing is normally done to achieve any one of the following purposes.
To modify and/or refine the grain structure and to eliminate coarse grained structures obtained in previous working operations such as rolling and forging.

Chilled cast iron. Iron-carbon alloy with low graphitization factor so that chill occurs forming a graphite-free structure.
The carbon is present bonded in the form of iron carbide, which is why the break surface of the material appears whitish instead of gray.

cooking vessels made of aluminium or hindalium for cooking food. Even if a steel spoon is brushed with force against aluminium vessels, minute particles of aluminium will appear as residue.
Hindalium is Alloy of aluminium magnesium, manganese, chromium and silicon.