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An induction motor is an AC electric motor in which power is supplied to the rotor by electromagnetic induction.
Induction motors are widely used in various applications, including industrial machinery, household appliances, and transportation systems.
They work based on the principle of electromagnetic induction, where a rotating magnetic field is created by the stator winding, inducing current in the rotor.
The rotor of...
The stator is used in an induction motor to generate a rotating magnetic field.
The stator consists of a set of windings that are connected to an AC power source.
When the AC power is applied, the stator windings create a rotating magnetic field.
This rotating magnetic field induces currents in the rotor, which in turn creates a torque and causes the rotor to rotate.
The stator windings are typically made of copper or alum...
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.
When an alternating current (AC) flows through the primary winding, it creates a changing magnetic field.
This changing magnetic field induces a voltage in the secondary winding, which is connected to the load.
The ratio of the number ...
There are two types of transformers according to voltage transfer: step-up transformers and step-down transformers.
Step-up transformers increase the voltage from the primary winding to the secondary winding.
Step-down transformers decrease the voltage from the primary winding to the secondary winding.
Step-up transformers are used in power transmission to increase voltage for long-distance transmission.
Step-down transfor...
A relay is an electrically operated switch that uses an electromagnet to mechanically control the switching action.
Relays are commonly used in electrical systems to control high power circuits with low power signals.
They consist of a coil, an armature, and one or more sets of contacts.
When the coil is energized, the armature is attracted and the contacts are closed or opened, depending on the relay type.
Relays can be u...
A contactor is an electrical device used for switching an electrical circuit on or off.
Contactor is used to control the flow of electricity in a circuit.
It consists of a coil, contacts, and an enclosure.
When the coil is energized, the contacts close and allow current to flow.
Contactor is commonly used in motor control applications.
Examples of contactor include magnetic contactor and air conditioning contactor.
MPCB and MCB are both circuit protection devices, but they differ in terms of their applications and trip characteristics.
MCB stands for Miniature Circuit Breaker, while MPCB stands for Motor Protection Circuit Breaker.
MCBs are primarily used for residential and commercial applications, while MPCBs are specifically designed for motor protection in industrial settings.
MCBs have a fixed trip current rating and are typica...
ELCB stands for Earth Leakage Circuit Breaker. It is a safety device used to protect electrical circuits from electric shock.
ELCB is designed to detect small leakage currents that may occur due to insulation failure or faulty wiring.
When an ELCB detects a leakage current, it quickly cuts off the power supply to prevent electric shock.
ELCBs are commonly used in homes, offices, and industries to ensure electrical safety.
...
There are several types of earthing used in electrical engineering.
The most common types of earthing are:
- TN-S system: separate neutral and protective earth
- TN-C system: combined neutral and protective earth
- TN-C-S system: combination of TN-S and TN-C systems
- TT system: separate earth for each electrical installation
- IT system: no direct connection to earth, relies on insulation monitoring
Other types include:
- TN-...
Neutral is a current-carrying conductor that completes an electrical circuit, while earth is a safety grounding conductor.
Neutral carries current back to the source in a balanced electrical system.
Earth is a safety measure to prevent electric shock and protect against electrical faults.
Neutral is typically connected to the center tap of a transformer, while earth is connected to the ground.
Neutral is part of the electr...
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I applied via Recruitment Consulltant and was interviewed in Sep 2024. There was 1 interview round.
The repeated burning of a 22 kW AOP motor CT cable may be due to overloading, short circuits, poor insulation, or incorrect cable sizing.
Check for overloading of the motor causing excessive heat in the cable
Inspect for short circuits in the motor or the wiring
Ensure proper insulation of the cable to prevent overheating
Verify if the cable size is appropriate for the motor's power requirements
Bypassing the CT of an AOP motor can lead to overcurrent and damage to the motor.
Bypassing the CT can result in the motor drawing excessive current.
This can lead to overheating of the motor windings.
Overcurrent can cause damage to the motor components.
It can also pose a safety risk due to potential electrical faults.
I applied via Job Portal and was interviewed before Apr 2022. There were 2 interview rounds.
PCB stands for Printed Circuit Board, a board made of non-conductive material with conductive tracks for electronic components.
PCB is used to mechanically support and electrically connect electronic components using conductive pathways.
It is made of non-conductive material like fiberglass, with copper tracks to connect components.
PCBs can be single-sided, double-sided, or multi-layered depending on the complexity of th...
Active components require a power source to operate, while passive components do not.
Active components require an external power source to function, such as transistors and integrated circuits.
Passive components do not require an external power source, such as resistors and capacitors.
Active components can control the flow of electricity, while passive components simply store or dissipate energy.
Examples of active comp...
Resistance is the opposition to the flow of current in a circuit, while a capacitor stores and releases electrical energy.
Resistance limits the flow of current, while a capacitor stores and releases charge.
Resistance is measured in ohms, while capacitance is measured in farads.
Examples of resistors include carbon film resistors, while examples of capacitors include ceramic capacitors.
Resistance dissipates energy in the...
SMT stands for Surface Mount Technology, a method of electronic component assembly where components are mounted directly onto the surface of a printed circuit board (PCB).
SMT components are smaller and lighter than through-hole components, allowing for higher component density on PCBs.
SMT components are typically mounted using solder paste and reflow soldering techniques.
SMT technology allows for automated assembly pro...
I applied via Company Website and was interviewed in Oct 2023. There were 2 interview rounds.
A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.
Transformers are commonly used to step up or step down voltage levels in electrical systems.
They consist of two coils of wire, known as the primary and secondary coils, wrapped around a core.
The primary coil is connected to the input voltage source, while the secondary coil is connected to the outpu...
Voltage is the difference in electric potential between two points.
Voltage is measured in volts (V).
It represents the potential energy per unit charge.
Voltage is the driving force that pushes electric current through a circuit.
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.
Ohm's Law is represented by the formula V = IR, where V is the voltage, I is the current, and R is the resistance.
It helps in calculating the current flowing through a circuit when the voltage and resistance are known, or determining the r...
I applied via Naukri.com and was interviewed in Feb 2024. There were 2 interview rounds.
Not good for future.
posted on 7 Oct 2024
I applied via LinkedIn and was interviewed in Sep 2024. There was 1 interview round.
Synchronisation process of a plant involves matching the frequency, voltage, and phase angle of the incoming generator with the grid.
Ensure the generator frequency matches the grid frequency (50Hz or 60Hz).
Match the voltage levels of the generator with the grid.
Adjust the phase angle of the generator to synchronize with the grid.
Use synchronizing equipment like synchroscope or synchronizing lamps to ensure proper synch...
Alternator and transformer protection systems are essential for preventing damage and ensuring safe operation.
Alternator protection systems typically include overcurrent, overvoltage, and reverse power protection to safeguard the alternator from damage.
Transformer protection systems often involve differential protection, overcurrent protection, and temperature monitoring to prevent overheating and insulation breakdown.
...
I applied via Company Website and was interviewed in Jun 2023. There were 2 interview rounds.
I applied via Walk-in and was interviewed before Feb 2023. There were 2 interview rounds.
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