Engineering Materials MCQ Questions & Answers | Mechanical Engineering

The charge of the blast furnace consists of Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

Pearlite consists of 13% cementite and 87% ferrite

Balls for ball bearings are made of Carbon-chrome steel

resilience is the ability of a material to absorb energy when it is deformed elastically, and release that energy upon unloading.

grey cast iron is a type of cast iron that has a graphitic microstructure

Gas turbine blade is made up of exotic materials superalloys to withstand in the difficult environment inside the gas turbine.
As a consequence of operating the gas turbine at high temperature and high stresses, the turbine blades are subjected to certain deformation (creep).

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as Hypoeutectic cast irons

The correct answer is A: Cold rolled steel.
Let's break down why:

Cold rolled steel: This type of steel is processed at room temperature after hot rolling. This process increases its strength, improves its surface finish, and makes it more dimensionally accurate. These are all important properties for bicycle frames, which need to be strong, lightweight, and have a smooth finish for welding and painting.

Hot rolled steel: This steel is processed at high temperatures. While it's cheaper to produce, it's not as strong or dimensionally accurate as cold-rolled steel. Its surface finish is also rougher, making it less suitable for bicycle frames.

Forged steel: Forging involves shaping steel using compressive forces. While forging can produce very strong parts, it's more commonly used for components like crankshafts or connecting rods that need to withstand extreme stress, not entire frame tubing.

Cast steel: Casting involves pouring molten steel into a mold. Cast steel can be used to make complex shapes, but it generally has lower strength and ductility compared to wrought steels (like rolled or forged steel). It is rarely used for bicycle frames due to its weight and potential for porosity.

In Summary: Bicycle frames need a strong, lightweight material with a good surface finish. Cold rolled steel provides the best balance of these properties, making it the ideal choice for bicycle frame tubing.

Uranium, Thorium and Niobium metal are used for nuclear energy

Aluminium bronze contains aluminium and copper in the ratio of 10 : 90