Jindal Stainless Electrical Engineer Interview Questions and Answers

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

Control valve calibration is a process of adjusting and setting control valves to ensure they operate correctly.

• Control valve calibration involves adjusting the valve to achieve the desired flow rate or pressure.

• Calibration may include checking the valve position, response time, and accuracy.

• Proper calibration ensures the control valve functions accurately and efficiently.

• Examples of calibration methods include bench t

Improving power factor helps in reducing energy losses, increasing system efficiency, and reducing electricity costs.

• Improving power factor reduces the amount of reactive power flowing in the system, which in turn reduces energy losses.

• Higher power factor means more efficient use of electricity and less strain on the electrical system.

• Improving power factor can lead to reduced electricity costs for consumers and utilit...read more

Buccholz relay is a protective device used in oil-filled transformers to detect faults such as internal arcing or overheating.

• Buccholz relay is installed in the oil pipe connecting the transformer tank and conservator tank.

• It works based on the principle that gas is generated when a fault occurs in the transformer, causing oil level to drop and gas to accumulate in the relay.

• The relay consists of two float switches - o...read more

DP in Siemens communication stands for Distributed Peripherals.

• DP is a communication protocol used by Siemens for connecting distributed peripherals to a central control system.

• It allows for real-time data exchange between the peripherals and the control system.

• DP is commonly used in industrial automation applications.

• Examples of DP communication modules include DP/DP couplers and DP slaves.

To communicate S7 PLC and ABB drive using Profibus, you need to configure the Profibus network, set up the communication parameters, and establish the communication link.

• Configure the Profibus network by setting the correct baud rate, address, and other network parameters.

• Set up the communication parameters on both the S7 PLC and ABB drive to ensure they are compatible with each other.

• Establish the communication link b...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.