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SHYAM METALICS AND ENERGY
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I applied via Referral and was interviewed before Dec 2023. There was 1 interview round.
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 ...
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 ...
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...
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...
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
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...
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 ...
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...
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
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
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
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...
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
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...
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...
I was interviewed in Jul 2022.
I applied via Referral and was interviewed before Dec 2022. There were 3 interview rounds.
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posted on 28 Aug 2024
I was interviewed in Jul 2024.
Transformer is a static device is change is ac voltage one level and another level but no change in frequency the work in mutual induction method.
Sailent type rotor and cylinder type rotor of uses in syuchronus machine.
I applied via Naukri.com and was interviewed in Mar 2024. There were 3 interview rounds.
Transformers, motors, generators, and electric generation are essential components in electrical systems.
Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction.
Motors convert electrical energy into mechanical energy to drive machinery.
Generators convert mechanical energy into electrical energy.
Electric generation involves the process of producing electric...
DC motors are electric motors that operate using direct current (DC) power sources.
DC motors convert electrical energy into mechanical energy through the interaction of magnetic fields.
They are commonly used in appliances, power tools, and electric vehicles.
DC motors have two main types: brushed DC motors and brushless DC motors.
Brushed DC motors use brushes to conduct current, while brushless DC motors use electronic ...
Number System, coding and decoding, Analogies
Nodal analysis is a method used in electrical engineering to determine the voltage at each node in a circuit.
Nodal analysis involves writing Kirchhoff's Current Law equations for each node in a circuit.
It is used to analyze complex circuits with multiple nodes and voltage sources.
The goal of nodal analysis is to determine the voltage at each node relative to a reference point, usually ground.
It is a powerful tool for s...
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
Consists of two coils of wire, known as primary and secondary coils
Primary coil receives electrical energy and creates a magnetic field
Magnetic field induces a voltage in the secondary coil, transferring energy
Used to step up or step down voltage levels in power distribution systems
Commo...
posted on 12 Apr 2023
I applied via AmbitionBox and was interviewed in Aug 2023. There were 3 interview rounds.
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
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
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
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
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
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
I was interviewed in Jan 2024.
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...
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.
I applied via campus placement at Sanjay Gandhi Polytechnic, Bellary and was interviewed in Sep 2023. There were 2 interview rounds.
posted on 30 Nov 2023
I applied via Naukri.com and was interviewed in May 2023. There was 1 interview round.
Different types of protection are used in a substation to ensure safety and reliability.
Overcurrent protection: Protects against excessive current flow.
Overvoltage protection: Safeguards against high voltage surges.
Differential protection: Detects faults by comparing currents entering and leaving the substation.
Distance protection: Protects transmission lines based on the distance to the fault.
Ground fault protection: ...
Different types of HT breakers are used in HT lines depending on the specific requirements.
Air Circuit Breaker (ACB) is commonly used in HT lines for its high breaking capacity and quick response time.
Vacuum Circuit Breaker (VCB) is another popular choice due to its compact size and low maintenance requirements.
SF6 Circuit Breaker is used for high voltage applications as it provides excellent arc quenching properties.
O...
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