ArcelorMittal Nippon Steel Electrical Shift Engineer Interview Questions and Answers

My current salary is $50,000 per year. I am looking to change jobs for career growth and new challenges.

• Current salary is $50,000 per year

• Seeking career growth and new challenges

• Opportunity for advancement in new role

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

Transformer parts include core, windings, insulation, tap changer, and cooling system.

• Core: magnetic material that provides a path for the magnetic flux

• Windings: conductors that carry the electrical current

• Insulation: material that separates the windings and core to prevent short circuits

• Tap changer: device that adjusts the number of turns in the windings to regulate voltage

• Cooling system: dissipates heat generated by ...read more

Transformer nameplate details include manufacturer, model, kVA rating, voltage rating, frequency, and serial number.

• Manufacturer name

• Model number

• kVA rating

• Voltage rating

• Frequency

• Serial number

The minimum insulation resistance value for a Lt Motor.

• The minimum insulation resistance value for a Lt Motor is typically 1 Megaohm.

• This value is important to ensure the motor is properly insulated and protected from electrical faults.

• Insulation resistance can be measured using a megohmmeter.

• Factors that can affect insulation resistance include temperature, humidity, and contamination.

• Regular testing of insulation res...read more

Minimum insulation resistance value for HT motor.

• HT motor insulation resistance should be at least 1 Mega Ohm

• Insulation resistance should be measured regularly to ensure safety

• Factors like temperature and humidity can affect insulation resistance