Tata Steel Assistant Electrical Engineer Interview Questions and Answers

Q1. What are Fleming's Left Hand Rule and Right Hand Rule in electromagnetism?
Ans. 
Fleming's Left Hand Rule and Right Hand Rule are used to determine the direction of force, current, or magnetic field in electromagnetism.
• Fleming's Left Hand Rule is used to determine the direction of force on a current-carrying conductor in a magnetic field.

• Fleming's Right Hand Rule is used to determine the direction of induced current in a conductor moving in a magnetic field.

• Both rules are based on the relationship ...read more
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Q2. What is the working principle of motors and generators?
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Motors convert electrical energy into mechanical energy, while generators convert mechanical energy into electrical energy.
• Motors work on the principle of electromagnetic induction, where a current-carrying conductor experiences a force in a magnetic field.

• Generators work on the principle of Faraday's law of electromagnetic induction, where a changing magnetic field induces an electromotive force in a conductor.

• Motors ...read more
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Q3. What is the working principle of a transformer?
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A transformer works on the principle of electromagnetic induction to transfer electrical energy between two or more circuits.
• Transformers have two coils of wire, known as the primary and secondary coils, which are wound around a core made of ferromagnetic material.

• When an alternating current flows through the primary coil, it creates a changing magnetic field around the coil.

• This changing magnetic field induces a volta...read more
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Q4. What is the control circuit of a star-delta starter?
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The control circuit of a star-delta starter involves two contactors and a timer for smooth transition from star to delta connection.
• The control circuit includes a main contactor for connecting the motor in star during starting.

• A timer is used to delay the transition from star to delta connection to prevent sudden voltage spikes.

• Once the timer elapses, a delta contactor is energized to switch the motor windings from sta...read more
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Q5. What are the safety devices used in conveyor belts and how are they wired?
Ans. 
Safety devices used in conveyor belts include pull cord switches, belt sway switches, and emergency stop switches.
• Pull cord switches are used to stop the conveyor belt in case of emergency by pulling the cord.

• Belt sway switches are used to detect any misalignment or deviation of the belt and trigger an alarm or stop the conveyor.

• Emergency stop switches are placed at regular intervals along the conveyor belt to quickly
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Q6. What activities are involved in electrical preventive maintenance?
Ans. 
Electrical preventive maintenance activities include inspection, testing, cleaning, and replacement of components to prevent breakdowns.
• Regular inspection of electrical systems

• Testing of equipment for proper functioning

• Cleaning of electrical components to prevent dust buildup

• Replacement of worn out or damaged parts

• Tightening of connections to prevent loose connections

• Checking for overheating issues

• Updating software/fir...read more
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Q7. What is the generator excitation system?
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The generator excitation system is a system that provides the necessary field current to the generator rotor to produce the desired voltage output.
• The excitation system controls the magnetic field strength of the generator to regulate the output voltage.

• It typically consists of an exciter, voltage regulator, and automatic voltage regulator (AVR).

• The exciter produces the field current, the voltage regulator adjusts the ...read more
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Q8. What are the common malfunctions and troubleshooting methods for electrical feeders?
Ans. 
Common malfunctions and troubleshooting methods for electrical feeders
• Common malfunctions include short circuits, overloads, and open circuits

• Troubleshooting methods involve checking for loose connections, using a multimeter to test for continuity, and inspecting for physical damage

• In case of a short circuit, isolate the fault by disconnecting sections of the feeder until the fault is located

• For overloads, check the lo...read more
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Q9. What is the minimum megger value required for high tension (HT) and low tension (LT) motors?
Ans. 
The minimum megger value required for high tension (HT) and low tension (LT) motors is typically 500V for HT motors and 250V for LT motors.
• Minimum megger value for HT motors is usually 500V

• Minimum megger value for LT motors is typically 250V

• Megger testing is essential to ensure insulation resistance in motors
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Q10. Does a Megger generate AC or DC, and what is the reason for its output?
Ans. 
A Megger generates DC voltage to test insulation resistance in electrical systems.
• A Megger generates DC voltage typically ranging from 250V to 5000V

• The reason for using DC voltage is to accurately measure the insulation resistance of electrical systems

• DC voltage helps in detecting any insulation faults or breakdowns in the system

• The high voltage generated by a Megger helps in identifying potential issues before they ca
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Q11. How can the Megger value of a found unsatisfactory insulation be improved?
Ans. 
The Megger value of unsatisfactory insulation can be improved by drying out the insulation, repairing any damaged areas, and retesting.
• Dry out the insulation using heaters or fans to remove moisture

• Repair any damaged areas by replacing or patching up the insulation

• Retest the insulation using the Megger to ensure the value has improved

• Consider using insulation coatings or sealants to improve the insulation resistance
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Q12. What are the maintenance practices for transformers?
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Maintenance practices for transformers include regular inspections, testing, cleaning, and oil analysis.
• Regularly inspecting for signs of overheating, leaks, or damage

• Performing routine testing such as insulation resistance and turns ratio tests

• Keeping the transformer and surrounding area clean and free of debris

• Conducting oil analysis to monitor the condition of the transformer oil

• Ensuring proper ventilation and cooli...read more
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Q13. What steps should be taken if a transformer trips due to the Buchholz relay acting?
Ans. 
Steps to be taken if a transformer trips due to Buchholz relay acting
• Immediately isolate the transformer from the system to prevent further damage

• Inspect the transformer and Buchholz relay for any faults or leaks

• Reset the Buchholz relay and check for proper functioning

• Investigate the cause of the trip such as internal faults or oil contamination

• Repair or replace any faulty components before re-energizing the transforme
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Q14. What are the protective measures for a transformer?
Ans. 
Protective measures for a transformer include overcurrent protection, temperature monitoring, and regular maintenance.
• Overcurrent protection: Use fuses or circuit breakers to protect against excessive current flow.

• Temperature monitoring: Install temperature sensors to prevent overheating.

• Regular maintenance: Inspect and test the transformer regularly to ensure proper functioning.

• Grounding: Properly ground the transform...read more
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Q15. What is the bus changeover scheme?
Ans. 
Bus changeover scheme is a system used to transfer power supply from one source to another in case of a fault or maintenance.
• Bus changeover scheme involves the use of automatic transfer switches (ATS) or manual switches to transfer power sources.

• It ensures uninterrupted power supply by quickly switching to an alternate power source when needed.

• Common examples include dual power supply systems in data centers or hospita...read more
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Q1. What is thermocouple
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Q2. What is rtd
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Q1. All control wireing and power wireing all dcs plc work going on
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Q2. Automation rooling mill division jamshedpur
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Q1. I am electrical engineer working on it and found in the same as par required production okay for me to get the same as the motor is overloaded due to the machine running ok but
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Q2. Automation work
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I am electrical engineer working on it jamshedpur jharkhand steel strips wheel limited jamshedpur jharkhand

Q1. What's is tha 3 phase tranformer
Ans. 
A 3 phase transformer is a type of transformer that is designed to handle three-phase power distribution systems.
• Consists of three sets of primary and secondary windings

• Used in power distribution systems to step up or step down voltage in three-phase circuits

• Commonly used in industrial and commercial applications

• Examples include distribution transformers, power transformers, and autotransformers
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Q1. What is the 3 phase tranformer
Ans. 
A 3 phase transformer is a type of transformer that is designed to handle three-phase power distribution systems.
• Consists of three sets of primary and secondary windings

• Used in power distribution systems to step up or step down voltage in three-phase circuits

• Commonly used in industrial and commercial applications

• Examples include distribution transformers, power transformers, and autotransformers
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Q2. 2 phase tranformer what is the
Ans. 
A 2 phase transformer is a type of transformer that has two primary and two secondary windings.
• Consists of two primary windings and two secondary windings

• Used in certain industrial applications where a 3 phase transformer is not feasible

• Less common compared to single phase and 3 phase transformers
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Q3. Kichoff current law what is
Ans. 
Kirchhoff's current law states that the total current entering a junction is equal to the total current leaving the junction.
• Total current entering a junction = Total current leaving the junction

• It is based on the principle of conservation of charge

• Used to analyze and solve electrical circuits
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Q4. What is the semi conductor
Ans. 
A semiconductor is a material that has electrical conductivity between a conductor and an insulator.
• Semiconductors have a conductivity between that of a conductor and an insulator

• They are used in electronic devices such as transistors, diodes, and integrated circuits

• Common semiconductor materials include silicon, germanium, and gallium arsenide
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Q5. What is tha current law
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Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor.
• Current (I) = Voltage (V) / Resistance (R)

• It helps in calculating the current flowing through a circuit based on the voltage and resistance values.

• It is represented by the formula I = V/R.

• Ohm's Law is fundamental in understanding and analy
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Q1. AC current kya hai
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Q2. DC current kya hai
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Q3. DC current direct current hai
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Q4. DC direct current hai
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Q5. AC alternator current hai
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Q1. (1) tell your self, (2) Passt company work, (3) what is VFD and it's diagram, (4) Electrical maintenance related questions
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Q2. Motor related questions
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Q3. MCC and PCC panel
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Q1. (1) Salary discussion, (2) Experience related questions
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