AstraZeneca Interview Questions and Answers

Welding aluminium is difficult due to its high thermal conductivity, low melting point, and susceptibility to distortion and cracking.

• Aluminium has a high thermal conductivity, which means it dissipates heat quickly, making it difficult to maintain a consistent temperature during welding.

• Aluminium has a low melting point, which means it can easily become overheated and distorted during welding.

• Aluminium is susceptible to cracking due to its high shrinkage rate and low ductili...read more

Cast iron absorbs vibrations due to its high damping capacity and stiffness.

• Cast iron has a high damping capacity, which means it can dissipate energy from vibrations.

• It is also stiff, which allows it to resist deformation and maintain its shape under stress.

• These properties make it ideal for use in applications where vibration damping is important, such as engine blocks and machine tool bases.

• Cast iron can also be made with different compositions and microstructures to optim...read more

Different types of steel and cast iron have unique properties and are used for specific applications.

• Steel is used for construction, automotive, and aerospace industries.

• Cast iron is used for engine blocks, pipes, and cookware.

• Stainless steel is corrosion-resistant and used for medical equipment and cutlery.

• High carbon steel is used for cutting tools and knives.

• Alloy steel is used for high-stress applications like bridges and cranes.

Stiffness is a measure of resistance to deformation. It is measured in units of force per unit of displacement.

• Stiffness is the ability of an object to resist deformation under an applied force.

• It is measured by the ratio of the force applied to the resulting displacement.

• The unit of stiffness is Newtons per meter (N/m) or Pascals (Pa).

• For example, a spring with a high stiffness constant will require a large force to compress it a small distance.

• Stiffness is an important prop...read more

Properties of cast iron, mild steel, and alloy steel.

• Cast iron is brittle and has high compressive strength.

• Mild steel is ductile and has low carbon content.

• Alloy steel has high strength and toughness due to the addition of other elements.

• Cast iron is used in engine blocks and pipes.

• Mild steel is used in construction and automobile manufacturing.

• Alloy steel is used in aerospace and defense industries.

Alloying elements are added to steel to improve its properties such as strength, corrosion resistance, and toughness.

• Alloying elements can improve the strength of steel by forming stronger bonds between the atoms.

• Chromium is added to steel to improve its corrosion resistance.

• Manganese is added to steel to improve its toughness.

• Nickel is added to steel to improve its ductility.

• Vanadium is added to steel to improve its wear resistance.

• Aluminum is added to steel to improve its m...read more