Tata Steel Electrical Engineer Interview Questions, Process, and Tips

PLC stands for Programmable Logic Controller, used in industrial automation to control machinery and processes.

• PLC is a digital computer used for automation of electromechanical processes.

• It uses a programmable memory to store instructions and specific functions.

• PLCs are commonly used in manufacturing plants, assembly lines, and other industrial settings.

• They can be programmed using ladder logic, function block diagram...read more

Different types of communication cables used in the electrical engineering industry include coaxial cables, twisted pair cables, and fiber optic cables.

• Coaxial cables: used for high-frequency transmission and commonly used in cable television and computer networks.

• Twisted pair cables: consists of pairs of insulated copper wires twisted together to reduce electromagnetic interference, commonly used in Ethernet networks.

• ...read more

Single mode fiber optic cable has a smaller core size and allows only one mode of light to propagate, while multimode fiber optic cable has a larger core size and allows multiple modes of light to propagate.

• Single mode fiber optic cable has a core size of 8-10 microns, while multimode fiber optic cable has a core size of 50-62.5 microns.

• Single mode fiber optic cable provides higher bandwidth and longer transmission dis...read more

Types of transformers include step-up, step-down, isolation, autotransformer, and distribution transformers.

• Step-up transformer increases voltage output

• Step-down transformer decreases voltage output

• Isolation transformer provides electrical isolation between primary and secondary windings

• Autotransformer has a single winding with multiple taps for different voltage levels

• Distribution transformer is used to distribute pow

Protection system for transformers includes Buchholz relay, differential protection, overcurrent protection, and temperature monitoring.

• Buchholz relay detects internal faults like gas accumulation or oil leakage

• Differential protection compares currents entering and leaving the transformer to detect faults

• Overcurrent protection safeguards against excessive current flow

• Temperature monitoring ensures the transformer opera

Regular maintenance of transformers and motors is crucial for ensuring optimal performance and preventing breakdowns.

• Regularly inspecting for signs of wear and tear

• Checking and replacing worn out parts such as brushes and bearings

• Testing insulation resistance

• Cleaning and lubricating moving parts

• Monitoring temperature and vibration levels

• Following manufacturer's maintenance guidelines

• Keeping records of maintenance activ

Differential protection of transformer ensures that any internal fault is quickly detected and isolated to prevent damage.

• Differential protection compares the current entering and leaving the transformer windings. If there is a difference, it indicates a fault.

• The relay used for differential protection operates when the difference in current exceeds a set threshold.

• This protection scheme is effective in detecting inter...read more

Ten delta test is a method used to determine the phase relationship between the primary and secondary windings of a transformer.

• Ten delta test involves injecting a low voltage signal into the primary winding and measuring the corresponding output in the secondary winding.

• The test helps in identifying any phase shift or angular displacement between the primary and secondary windings.

• It is important for ensuring the prop...read more