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Single phase and three phase are two types of electrical power distribution systems.
Single phase has one live conductor and one neutral conductor, while three phase has three live conductors and one neutral conductor.
Single phase is commonly used in residential and small commercial applications, while three phase is used in industrial and large commercial applications.
Single phase power supply is suitable for low power...
R, Y, B phases are the three phases of AC power supply. They differ in their phase angle and voltage level.
R phase has a phase angle of 0 degrees and is usually connected to the red wire.
Y phase has a phase angle of 120 degrees and is usually connected to the yellow wire.
B phase has a phase angle of 240 degrees and is usually connected to the blue wire.
The voltage level of each phase is the same, but they are out of ph...
In series, voltage adds up while current remains the same. In parallel, voltage remains the same while current adds up.
In series, batteries are connected end-to-end, positive to negative. In parallel, batteries are connected positive to positive and negative to negative.
Series connection increases voltage but does not increase current. Parallel connection increases current but does not increase voltage.
Series connectio...
Periodic maintenance of batteries is crucial for their longevity and optimal performance.
Check the battery terminals for corrosion and clean them if necessary
Inspect the battery case for any cracks or damage
Ensure that the battery is securely fastened in place
Check the electrolyte level and top up with distilled water if required
Test the battery voltage and recharge if necessary
A faulty battery can be identified by checking its voltage, capacity, and physical appearance.
Check the voltage of the battery using a multimeter
Test the capacity of the battery using a battery tester
Inspect the physical appearance of the battery for any signs of damage or leakage
Check the battery terminals for corrosion or loose connections
Compare the battery's performance to its specifications
FUSE, MCB, ELCB, and RCCB are all electrical protection devices, but they differ in their functions and applications.
FUSE is a simple device that protects electrical circuits from overloading or short-circuiting by melting and breaking the circuit.
MCB (Miniature Circuit Breaker) is an automatic switch that trips and cuts off the power supply when there is an overload or short-circuit.
ELCB (Earth Leakage Circuit Breaker...
A DOL starter is a direct online motor starter that provides full voltage to the motor.
Consists of a contactor, overload relay, and start/stop buttons
The contactor connects the motor to the power supply
The overload relay protects the motor from overloading
The start/stop buttons control the on/off function of the motor
Used for small motors with low starting current
Not suitable for large motors or motors with high starti
posted on 12 Oct 2024
I applied via campus placement at PSG College of Technology, Coimbatore and was interviewed in Sep 2024. There were 3 interview rounds.
General knowlegde, Basic Aptitude, Domain Technical MCQ
Genx vs Genz, Altitude and comparsion
Components of a transformer include core, windings, and insulation.
Core: Provides a path for magnetic flux
Windings: Primary and secondary coils for inducing voltage
Insulation: Prevents short circuits and ensures safety
MCB is a miniature circuit breaker used for low voltage applications, while MCCB is a molded case circuit breaker used for higher currents and voltages.
MCB is designed for low voltage applications, typically up to 1000V, while MCCB is designed for higher currents and voltages, typically up to 2500V.
MCB is usually thermal-magnetic in operation, while MCCB can be thermal-magnetic or electronic trip units.
MCB is compact i...
Different types of breakers include circuit breakers, fuse breakers, and ground fault circuit interrupters.
Circuit breakers: Automatically switch off electrical circuits during abnormal conditions.
Fuse breakers: Use a fuse to interrupt the circuit when overloaded.
Ground fault circuit interrupters (GFCI): Detect imbalances in current flow to prevent electrical shocks.
Miniature circuit breakers (MCB): Provide protection ...
I applied via Company Website and was interviewed in Apr 2023. There were 2 interview rounds.
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
Ohm's law is represented by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.
It is named after Georg Simon Ohm, a German physicist who first formulated this law.
This law is applicable to all types of circuits, including DC and AC circuits.
It is use...
I applied via Walk-in and was interviewed in Mar 2023. There were 4 interview rounds.
The Loto system stands for Lockout/Tagout, a safety procedure used to ensure that dangerous machines are properly shut off and not started up again during maintenance or servicing.
Loto system involves locking the energy-isolating devices with individual lockout devices to prevent the machine from being turned on
Tagout involves placing a tag on the locked device to indicate that it should not be operated
Employees workin...
posted on 25 Oct 2023
I was interviewed in Jul 2022.
HVDC is a technology used to transmit high voltage DC power over long distances. Offshore connections refer to power transmission from offshore wind farms.
HVDC is more efficient than AC transmission over long distances
Offshore connections require specialized equipment and installation techniques
HVDC is used for offshore connections to transmit power from offshore wind farms to the mainland
Examples of HVDC projects incl...
I applied via Recruitment Consulltant and was interviewed in Sep 2022. There were 4 interview rounds.
The process for a project involves planning, design, implementation, testing, and commissioning.
Define project scope and objectives
Create a project plan with timelines and milestones
Design the system or product
Procure necessary materials and equipment
Implement the design and build the system or product
Test the system or product to ensure it meets requirements
Commission the system or product for use
Provide ongoing suppo...
I was interviewed in May 2022.
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