Usha Martin Engineer Interview Questions and Answers

Transformer maintenance involves regular inspection, testing, and cleaning to ensure optimal performance and prevent breakdowns.

• Inspect transformer for signs of damage or wear

• Test transformer oil for impurities and breakdown voltage

• Clean transformer components and replace worn parts

• Check and tighten electrical connections

• Monitor transformer temperature and load capacity

• Follow manufacturer's recommended maintenance sche...read more

PLC breakdown due to power surge, resolved by replacing damaged components.

• Power surge caused damage to PLC components

• Identified damaged components through diagnostic tests

• Replaced damaged components to restore functionality

Load distribution scheme during shutdown management involves proper planning and allocation of resources to ensure safety and efficiency.

• Identify critical equipment and prioritize their shutdown sequence

• Ensure proper isolation and tagging of equipment to prevent accidental energization

• Allocate resources such as manpower, tools, and equipment based on the shutdown plan

• Monitor and control the load distribution during shu...read more

Starters are used to control the starting and stopping of motors. There are various types of starters with different circuit diagrams.

• Direct On-Line (DOL) Starter

• Star-Delta Starter

• Auto Transformer Starter

• Soft Starter

• Circuit diagrams vary depending on the type of starter used

• DOL starter circuit diagram includes a contactor and overload relay

• Star-Delta starter circuit diagram includes a timer and contactor

• Auto Transforme...read more

To modify drive parameters, access the drive's programming interface and adjust the desired settings.

• Identify the type of drive being used (e.g. AC drive, DC drive, servo drive)

• Access the drive's programming interface (e.g. keypad, software)

• Adjust the desired parameters (e.g. speed, torque, acceleration)

• Save the changes and test the drive's performance

• Examples of drive manufacturers with programming interfaces include ...read more

I have worked with both types of cranes - contactor logic and drive operated. The challenging failures varied.

• I have worked with contactor logic cranes in a steel plant where the main challenge was the wear and tear of the contactors due to the high current and frequent switching.

• In a drive operated crane, the main challenge was the programming and tuning of the variable frequency drives to ensure smooth and precise mo...read more

Mould oscillator and electromagnetic stirrer are used in caster to improve the quality of casted steel.

• Mould oscillator is a device that vibrates the mould during casting to prevent solidification defects and improve the surface quality of the steel.

• Electromagnetic stirrer is used to create a rotating magnetic field in the molten steel to improve the homogeneity of the steel and reduce inclusions.

• Both devices are used ...read more

I have handled various types of PLCs including Siemens, Allen Bradley, and Mitsubishi.

• Siemens PLCs - S7-200, S7-300, S7-400, and S7-1200 series

• Allen Bradley PLCs - MicroLogix, CompactLogix, and ControlLogix series

• Mitsubishi PLCs - FX series and Q series

• Experience in programming, troubleshooting, and maintenance of PLCs

• Familiarity with ladder logic, function block diagrams, and structured text programming languages

Surge arrester protects transformer from voltage surges. EAF uses furnace transformers. Max demand is the highest power demand in a given period.

• Surge arrester diverts high voltage surges to ground, protecting transformer insulation.

• EAF (Electric Arc Furnace) uses furnace transformers to supply power to the furnace.

• Max demand is the highest power demand in a given period, usually measured in kilowatts (kW) or megawatts...read more

Thermocouple is a temperature sensor that works on the principle of Seebeck effect.

• It consists of two dissimilar metals joined together at one end.

• When there is a temperature difference between the two ends, it generates a voltage.

• This voltage is proportional to the temperature difference and can be measured to determine the temperature.

• Thermocouples are commonly used in industrial applications such as furnaces, boiler...read more

Circuit diagrams for RDOL, Delta Connection in Motors & Star Delta Starter.

• RDOL circuit diagram includes a DOL starter with a relay for overload protection.

• Delta connection in motors is a three-phase connection where the ends of each phase are connected to form a closed loop.

• Star delta starter is used to reduce the starting current of a motor by initially connecting the motor in star configuration and then switching to...read more

Various types of equipment are available for furnace dust catching.

• Cyclone separators

• Electrostatic precipitators

• Bag filters

• Wet scrubbers

• Venturi scrubbers

Double earthing is a safety measure where two separate earth connections are provided for a system or equipment.

• System earthing is the connection of the neutral point of a power system to the earth to provide a low impedance path for fault current.

• Equipment earthing is the connection of non-current carrying parts of electrical equipment to the earth to prevent electric shock.

• Double earthing provides an additional layer...read more

Vacuum degassing is a process of removing dissolved gases from a liquid or a solid material by subjecting it to a low-pressure environment.

• It is commonly used in metallurgy to remove impurities from molten metals.

• It is also used in the production of electronic components to remove air bubbles from the resin.

• Vacuum degassing is important in the food industry to remove air from packaging to increase shelf life.

• It is also...read more

Zero speed switch is used to detect the absence or presence of motion in rotating equipment.

• It is used to monitor the speed of rotating equipment and detect any stoppage or slowdown.

• It can be used as a safety device to prevent damage to equipment or injury to personnel.

• It can also be used to control the start/stop of equipment based on the speed.

• Examples include conveyor belts, pumps, and fans.

• It works by sensing the r...read more

A Reactive Power Compensator is a device used to improve power factor and voltage stability in electrical systems.

• It is also known as a Static Var Compensator (SVC)

• It is used to regulate reactive power in electrical systems

• It can improve voltage stability and reduce power losses

• It consists of capacitors and inductors that can be switched on and off as needed

• Examples include Thyristor Controlled Reactor (TCR) and Thyris...read more

Yes, I am highly proficient in both Ms Excel and PowerPoint.

• I have extensive experience in creating and editing spreadsheets in Excel, including using formulas and macros.

• I am skilled in creating visually appealing and effective presentations in PowerPoint, including using animations and multimedia.

• I am also familiar with integrating Excel data into PowerPoint presentations.

• I am always eager to learn new features and t...read more

I am a highly motivated engineer with a passion for problem-solving and innovation.

• I have a degree in Mechanical Engineering from XYZ University.

• I have worked as an intern at ABC Company, where I gained experience in designing and testing prototypes.

• I am proficient in CAD software such as SolidWorks and have experience in project management.

• I am a quick learner and enjoy collaborating with others to find creative solut...read more

I possess a unique combination of technical skills and soft skills that make me an asset to any team.

• I have a strong technical background in engineering, with experience in both design and analysis.

• I am a quick learner and am always eager to expand my knowledge and skills.

• I have excellent communication and interpersonal skills, which allow me to work effectively with colleagues and clients alike.

• I am a team player and ...read more