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Motor starters with contactors provide protection by controlling the electrical supply to the motor.
Motor starters with contactors prevent overload by disconnecting the motor from the power supply when excessive current is detected.
They also protect against short circuits by quickly interrupting the circuit in case of a fault.
Thermal overload relays can be used in conjunction with contactors to provide additional prote...
I applied via Campus Placement and was interviewed in Mar 2024. There was 1 interview round.
A cooling tower is a specialized heat exchanger in which air and water are brought into direct contact to reduce the water's temperature.
Cooling towers are commonly used in industrial and HVAC systems to remove heat from a process or building.
They work by evaporating a small portion of the water to remove heat from the remaining water stream.
The cooled water is then circulated back into the system to absorb more heat.
C...
There are several types of power plants including thermal, hydroelectric, nuclear, solar, wind, and geothermal.
Thermal power plants use fossil fuels like coal, oil, or natural gas to generate electricity.
Hydroelectric power plants harness the energy of flowing water to generate electricity.
Nuclear power plants use nuclear reactions to produce electricity.
Solar power plants convert sunlight into electricity using photov...
A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
Consists of two coils of wire (primary and secondary) wound around a core
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 in power distribution systems
...
Resistance is the opposition to the flow of electric current in a circuit.
Resistance is measured in ohms (Ω).
It is caused by the collisions of electrons with atoms in a conductor.
Higher resistance leads to lower current flow in a circuit.
Resistance can be affected by factors like material, length, and temperature.
Examples of high resistance materials include rubber and glass.
Examples of low resistance materials include
Interest in electrical equipment skill skill development engineer
Diploma in electrical engineering in Gumla polytechnic Gumla Jharkhand
Mechanical energy to electrical energy convert in electrical machine and power system is a generation transmission and distribution of electrical energy
Transformers work on the principle of electromagnetic induction to transfer electrical energy between two or more circuits.
Transformers consist of two or more coils of wire called windings.
The primary winding is connected to the input voltage source, while the secondary winding is connected to the load.
When an alternating current (AC) flows through the primary winding, it creates a changing magnetic field.
This changing...
Motor working principle
A motor converts electrical energy into mechanical energy
It operates on the principle of electromagnetic induction
When current flows through a coil in a magnetic field, a force is generated, causing the coil to rotate
This rotation is transferred to the motor shaft, resulting in mechanical motion
Different types of motors include DC motors, AC motors, and stepper motors
The type of motor can be AC or DC, while the type of transformer can be step-up or step-down.
AC motors are commonly used in household appliances and industrial machinery.
DC motors are often used in electric vehicles and robotics.
Step-up transformers increase voltage while step-down transformers decrease voltage.
Transformers are used in power distribution systems to transfer electrical energy between different voltage l
A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by excess current.
It automatically interrupts the flow of electricity when a fault is detected.
It prevents damage to electrical equipment and reduces the risk of fire.
Circuit breakers can be reset after tripping, unlike fuses which need to be replaced.
They are commonly used in residential, commercial, and industrial a...
There are three types of circuits: series, parallel, and combination.
Series circuit: components are connected in a single path, current is the same throughout, voltage divides across components.
Parallel circuit: components are connected in multiple paths, voltage is the same across components, current divides across paths.
Combination circuit: a mix of series and parallel circuits, components are connected in both serie
CT stands for Current Transformer and PT stands for Potential Transformer.
CT is used to measure high currents by stepping down the current to a manageable level.
PT is used to measure high voltages by stepping down the voltage to a safe level.
CT and PT are commonly used in power systems for protection, metering, and control purposes.
CTs and PTs are typically connected to instruments, relays, or meters to provide accurat...
A register is a small amount of fast memory located within a computer's CPU.
Registers store data that the CPU needs to access quickly.
They are used to hold instructions, data, and addresses during the execution of a program.
Registers are faster to access than main memory, allowing for faster processing.
Examples of registers include the program counter, instruction register, and general-purpose registers.
A turbine is a device that converts the energy from a fluid flow into useful work.
Turbines are commonly used in power generation to convert the energy of steam, water, or gas into mechanical energy.
They consist of a rotor with blades that are driven by the fluid flow, causing the rotor to rotate.
The rotation of the rotor can be used to generate electricity or perform other types of work.
Different types of turbines incl...
What people are saying about JSW Steel
I applied via Naukri.com and was interviewed before Mar 2021. There were 3 interview rounds.
The question is asking for knowledge about all types of electrical systems.
Knowledge of different types of electrical systems such as AC, DC, single-phase, three-phase, etc.
Understanding of electrical components and their functions, such as resistors, capacitors, transformers, etc.
Familiarity with electrical codes and regulations.
Ability to read and interpret electrical schematics and diagrams.
Troubleshooting skills to...
JSW Steel interview questions for designations
posted on 14 Sep 2022
I applied via Approached by Company and was interviewed before Sep 2021. There was 1 interview round.
Control diagram of a motor with remote and local start using star delta starter.
Use a star delta starter for reduced voltage starting
Include a remote start/stop switch in the control circuit
Use a contactor to switch between star and delta connections
Include overload protection in the circuit
Use a control transformer to step down voltage for control circuit
Include a pilot light to indicate motor status
I applied via Company Website and was interviewed in Jul 2021. There were 3 interview rounds.
EOt crane is an electric overhead traveling crane used for lifting and moving heavy loads in industrial settings.
EOt stands for Electric Overhead Traveling
It is operated by an electrical control system
It consists of a bridge, hoist, trolley, and electrical components
It is commonly used in factories, warehouses, and construction sites
It can lift and move heavy loads up to several tons
It requires regular maintenance and
posted on 2 Sep 2023
Composite error and ratio error are two types of errors in current transformers.
Composite error is the combination of ratio error and phase angle error in a current transformer.
Ratio error is the difference between the actual turns ratio and the specified turns ratio of a current transformer.
Phase angle error is the angular difference between the primary and secondary currents of a current transformer.
Composite error a...
An AC drive circuit diagram controls the speed of an AC motor by varying the frequency and voltage of the power supplied to it.
An AC drive consists of a rectifier, DC link, inverter, and control circuitry.
The rectifier converts AC power to DC power, which is stored in the DC link.
The inverter converts the DC power back to AC power with variable frequency and voltage.
The control circuitry adjusts the frequency and volta...
A single line diagram of a distribution system is required with proper specifications.
The diagram should show the flow of power from the source to the load
It should include all components such as transformers, switchgear, and cables
The specifications should include voltage levels, power ratings, and protection devices
The diagram should follow standard symbols and conventions
Example: A 11 kV distribution system with a 5
Dewpoint test is done in transformer to check the moisture content in the insulation oil.
Moisture in insulation oil can cause breakdown of transformer insulation
Dewpoint test helps to determine the moisture content in the oil
It is a preventive maintenance measure to avoid transformer failure
The test involves cooling a mirror until dew forms on it, and measuring the temperature at which dew forms
Power transformers are used in transmission systems to step up or down voltage, while distribution transformers are used in distribution systems to step down voltage.
Power transformers are used in high voltage transmission systems to step up or down voltage for long distance transmission.
Distribution transformers are used in low voltage distribution systems to step down voltage for local distribution.
Power transformers...
Buchholz relay is used to protect transformers from faults by detecting gas and oil flow abnormalities.
Buchholz relay is installed in the pipe connecting the transformer tank and conservator tank.
It operates based on the principle that faults in the transformer generate gases and cause oil flow disturbances.
When gas or oil flow abnormalities occur, the relay trips and sends a signal to the control panel to isolate the ...
I applied via Company Website and was interviewed in Feb 2022. There was 1 interview round.
based on 4 interviews
Interview experience
based on 9 reviews
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