ArcelorMittal Nippon Steel QA QC Engineer Interview Questions and Answers

My job role as a QA QC Engineer has made me technically sound by providing me with in-depth knowledge of mechanical properties of alloys and testing methods.

• Regularly conducting tests on various alloys to determine their mechanical properties such as strength, hardness, and ductility

• Utilizing testing methods such as tensile testing, hardness testing, impact testing, and metallography to assess the quality of alloys

• Anal...read more

Power factor is the ratio of real power to apparent power in an AC circuit. VFD stands for Variable Frequency Drive. AC motors run on alternating current while DC motors run on direct current.

• Power factor is a measure of how effectively electrical power is being used in a circuit.

• It is calculated by dividing the real power (in watts) by the apparent power (in volt-amperes).

• A power factor of 1 indicates that all the pow...read more

Types of load cells include strain gauge load cells, hydraulic load cells, and capacitive load cells.

• Strain gauge load cells measure the strain or deformation of a material.

• Hydraulic load cells use hydraulic fluid to measure force.

• Capacitive load cells measure changes in capacitance to determine force.

• Other types of load cells include piezoelectric load cells and pneumatic load cells.

Starters are used to control the starting and stopping of motors. Different types of starters are used based on the motor's power rating and application.

• Direct On-Line (DOL) Starter

• Star-Delta Starter

• Auto Transformer Starter

• Soft Starter

• Variable Frequency Drive (VFD) Starter

Parallel operation of transformers refers to connecting two or more transformers with the same voltage ratio and frequency to supply a common load.

• Parallel operation increases the capacity of the system and provides redundancy.

• The transformers must have the same voltage ratio, impedance, and phase angle.

• Proper synchronization is necessary to avoid circulating currents.

• Parallel operation can be achieved by using a commo...read more

Steel is an alloy of iron and carbon, while stainless steel is a type of steel with added chromium for corrosion resistance. Types of steel include carbon steel, alloy steel, and tool steel.

• Steel is an alloy of iron and carbon

• Stainless steel contains chromium for corrosion resistance

• Types of steel include carbon steel, alloy steel, and tool steel

Types of mild steel include low carbon steel, medium carbon steel, and high carbon steel.

• Low carbon steel contains less than 0.3% carbon content.

• Medium carbon steel contains 0.3-0.6% carbon content.

• High carbon steel contains more than 0.6% carbon content.

A thyristor is a semiconductor device that acts as a switch and can handle high voltages and currents.

• It has three terminals: anode, cathode, and gate

• It can be turned on by applying a small current to the gate terminal

• It can handle high power and is commonly used in power control applications

• Examples include AC motor speed control, lighting dimming, and power supplies

The capacity of a furnace refers to its heating output, typically measured in BTUs or tons.

• Furnace capacity is determined by the amount of heat it can produce.

• It is usually measured in BTUs (British Thermal Units) or tons.

• Higher capacity furnaces can produce more heat and are suitable for larger spaces.

• For example, a furnace with a capacity of 80,000 BTUs can heat a larger area compared to one with a capacity of 40,000

Drive components in CCM department are the parts that enable the motor to function properly.

• Drive components include motors, gears, belts, and pulleys.

• They work together to transfer power from the motor to the machine.

• The components must be properly sized and aligned to ensure efficient operation.

• Examples of machines that use drive components include conveyor belts, pumps, and fans.

Steel is an alloy of iron and carbon, with other elements added to enhance its properties.

• Steel is primarily composed of iron and carbon.

• The carbon content in steel is typically between 0.2% and 2.1%.

• Other elements like manganese, chromium, nickel, and molybdenum are added to improve strength, hardness, and corrosion resistance.

• The composition of steel can vary depending on the desired properties and intended use.

• For e...read more

Iron is a chemical element while steel is an alloy of iron and carbon.

• Iron is a pure element while steel is a mixture of iron and carbon

• Iron is soft and malleable while steel is hard and strong

• Iron rusts easily while steel is more resistant to corrosion

• Iron is used in construction, manufacturing, and transportation while steel is used in construction, manufacturing, and many other industries

• Examples of iron products in...read more

The melting point of steel varies depending on the type of steel, but generally ranges from 1370-1530°C (2500-2790°F).

• Steel is an alloy of iron and carbon, with other elements added for specific properties.

• The melting point of steel can be affected by the amount and type of alloying elements.

• Different types of steel have different melting points, with some high-strength steels having melting points above 2000°C.

• Steel c...read more

Blast furnace liquids refer to the molten iron and slag that are produced during the iron-making process in a blast furnace.

• Blast furnace liquids are a mixture of molten iron and slag

• They are produced during the iron-making process in a blast furnace

• The molten iron is typically used to make steel

• The slag is a byproduct that can be used in construction or as a raw material in cement production

Slag is a byproduct of metal smelting process. Flux is a substance used to promote fusion in welding and soldering.

• Slag is a glass-like byproduct of metal smelting process

• It is usually composed of impurities that are separated from the metal during the smelting process

• Flux is a substance used to promote fusion in welding and soldering

• It helps to prevent oxidation and other impurities from contaminating the weld or sold...read more

Ladle refining process is a secondary steelmaking process used to remove impurities from molten steel.

• Molten steel is transferred from the primary steelmaking furnace to a ladle.

• Various chemicals are added to the ladle to remove impurities such as sulfur, phosphorus, and carbon.

• The ladle is then stirred to ensure the chemicals are evenly distributed.

• The refined steel is then poured into molds to create the desired shap...read more