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A relay is an electrical device that acts as a switch to control the flow of current in an electrical circuit.
Relays are used to control high-power devices with low-power signals.
They consist of an electromagnet and a set of contacts.
When the electromagnet is energized, it creates a magnetic field that attracts or releases the contacts, allowing or interrupting the flow of current.
Relays are commonly used in industrial...
Reverse forward draw is a control wiring method used in electrical systems to control the direction of rotation of a motor.
Reverse forward draw is used to control the direction of rotation of a motor.
It involves the use of a forward contactor and a reverse contactor.
The control wiring includes connections between the contactors, motor, and power supply.
By energizing the forward contactor, the motor rotates in one direc...
An AC motor is a type of electric motor that operates on alternating current.
AC motor stands for Alternating Current motor.
It converts electrical energy into mechanical energy.
AC motors are commonly used in household appliances, industrial machinery, and vehicles.
They are more efficient and require less maintenance compared to DC motors.
Examples of AC motors include induction motors, synchronous motors, and brushless m
AC motors and DC motors differ in their power source, construction, speed control, and applications.
AC motors run on alternating current, while DC motors run on direct current.
AC motors are more commonly used in household appliances, industrial machinery, and electric vehicles.
DC motors are often found in battery-powered devices, such as laptops, electric cars, and robots.
AC motors have a simpler construction with fewe...
MCB stands for Miniature Circuit Breaker.
MCB is an electrical switch that automatically interrupts the flow of current in an electrical circuit during an overload or short circuit.
It is a type of circuit breaker that is commonly used in residential and commercial buildings.
MCBs are designed to protect electrical circuits and appliances from damage caused by excessive current.
They are compact in size and can be easily i...
A timer is a device that measures and controls the passage of time.
A timer is used to initiate or stop a process at a specific time or after a specific duration.
Timers can be mechanical or electronic.
They are commonly used in various applications such as appliances, industrial machinery, and automation systems.
Examples of timers include kitchen timers, programmable thermostats, and countdown timers in sports events.
VFD stands for Variable Frequency Drive.
VFD is an electronic device used to control the speed and torque of an electric motor.
It adjusts the frequency and voltage supplied to the motor, allowing for precise control of motor speed.
VFDs are commonly used in industrial applications to save energy, improve motor performance, and enable soft starting and stopping.
They are also known as AC drives, adjustable speed drives, or...
PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.
PLC is a specialized computer designed to control industrial processes.
It uses a programmable memory to store instructions and execute them in a sequential manner.
PLCs are commonly used in manufacturing plants, power stations, and other industrial settings.
They can be programmed to control various d...
An AC motor is a type of electric motor that operates on alternating current.
AC motor stands for alternating current motor.
It converts electrical energy into mechanical energy.
AC motors are commonly used in household appliances, industrial machinery, and vehicles.
They are more efficient and require less maintenance compared to DC motors.
Examples of AC motors include induction motors, synchronous motors, and brushless m
A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).
Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.
They are made up of diodes, which allow current to flow in only one direction.
Rectifiers can be half-wave or full-wave, depending on the number of diodes used.
Examples of rectifiers include bridge rectifiers, vacuum tube rectifiers, and soli
A diode is an electronic component that allows current to flow in one direction and blocks it in the opposite direction.
Diodes are commonly used in rectifier circuits to convert AC to DC.
They have two terminals: an anode (positive) and a cathode (negative).
When the voltage across a diode is forward-biased, it allows current to flow.
When the voltage is reverse-biased, it blocks the current.
Diodes are often used for volt...
PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.
PLC is used to control and monitor industrial processes.
It is programmed using ladder logic or other programming languages.
PLCs are commonly used in manufacturing, power plants, and transportation systems.
They can be used to control motors, valves, sensors, and other devices.
PLCs provide real-time m...
A timer is a device or software that measures and controls the passage of time.
A timer can be a physical device with buttons and a display, or it can be a software program on a computer or smartphone.
Timers are commonly used in various applications such as cooking, sports, and industrial processes.
They can be set to count down from a specific time or count up from zero.
Some timers have additional features like alarms, ...
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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 ...
posted on 12 May 2020
posted on 8 Jun 2023
I applied via Naukri.com and was interviewed in Nov 2022. There were 3 interview rounds.
posted on 29 Nov 2022
I applied via Walk-in and was interviewed in May 2022. There was 1 interview round.
The capacity of a furnace refers to its heating output, typically measured in BTUs or tons.
Furnace capacity is determined by the amount of heat it can produce.
It is usually measured in BTUs (British Thermal Units) or tons.
Higher capacity furnaces can produce more heat and are suitable for larger spaces.
For example, a furnace with a capacity of 80,000 BTUs can heat a larger area compared to one with a capacity of 40,000
Drive components in CCM department are the parts that enable the motor to function properly.
Drive components include motors, gears, belts, and pulleys.
They work together to transfer power from the motor to the machine.
The components must be properly sized and aligned to ensure efficient operation.
Examples of machines that use drive components include conveyor belts, pumps, and fans.
posted on 27 Jan 2025
Current is the flow of electric charge in a circuit.
Current is measured in Amperes (A)
It is the rate of flow of electric charge
Current flows from high potential to low potential
In a series circuit, the current remains the same throughout
Residence refers to a person's primary place of living.
Residence is where a person lives on a permanent or long-term basis.
It can refer to a house, apartment, or any other type of dwelling.
Residence can also refer to a legal status, such as residency in a particular country.
It is important for determining things like tax obligations and voting rights.
posted on 13 Jun 2024
I applied via Recruitment Consulltant and was interviewed in Dec 2023. There was 1 interview round.
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...
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...
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...
posted on 30 Apr 2023
I applied via Recruitment Consulltant and was interviewed in Oct 2022. There were 2 interview rounds.
DC current is the flow of electric charge in a constant direction.
DC stands for Direct Current.
It is the type of electric current that flows in a single direction.
DC current is produced by sources such as batteries, fuel cells, and solar cells.
It is commonly used in electronic devices and power transmission systems.
Unlike AC (Alternating Current), DC current does not change its direction over time.
DC current is the flow of electric charge in a single direction.
DC stands for Direct Current
It is produced by sources such as batteries, fuel cells, and solar cells
DC current is used in electronic devices such as computers, televisions, and radios
DC current is measured in amperes (A)
posted on 21 Sep 2023
I applied via Campus Placement and was interviewed in Mar 2023. There were 3 interview rounds.
The current situation in the electrical engineering field is rapidly evolving with advancements in technology and increasing demand for sustainable energy solutions.
Advancements in renewable energy sources such as solar and wind power are shaping the future of electrical engineering.
The integration of smart grid technology and Internet of Things (IoT) in electrical systems is becoming more prevalent.
Electric vehicles a...
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