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Blocked rotor test is performed on a 3-phase induction motor to determine its impedance and calculate its locked rotor current.
The motor is connected to a 3-phase supply with the rotor blocked.
The voltage and current are measured and used to calculate the motor's impedance.
The locked rotor current can be determined from the impedance.
The test helps in assessing the motor's performance and identifying any faults or issu
Single phase induction motor is not self-starting due to the absence of rotating magnetic field. Different methods of starting include capacitor start, split-phase, shaded pole, and reluctance start.
Single phase induction motor lacks rotating magnetic field
Capacitor start uses a capacitor to create a phase shift and start the motor
Split-phase uses a starting winding to create a phase shift
Shaded pole uses a shading coi...
Different methods of resistance measurement and their ranges
Low resistance measurement: 4-wire Kelvin method, range 0.1 μΩ to 1 Ω
Medium resistance measurement: 2-wire method, range 1 Ω to 1 MΩ
High resistance measurement: Megohmmeter method, range 1 MΩ to 10 TΩ
Other methods include 3-wire method and 4-wire guarded method
Measurement accuracy depends on the method used and the quality of the equipment
Lightning arresters are used in transmission lines to protect the equipment and infrastructure from damage caused by lightning strikes.
Lightning arresters divert the high voltage surge caused by lightning strikes to the ground, preventing it from damaging the transmission lines.
They provide a low-resistance path for the lightning current to flow, reducing the risk of electrical breakdown and flashovers.
Lightning arrest...
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posted on 5 Jan 2025
It's ok the question are asked from the basis
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...
A motor is a device that converts electrical energy into mechanical energy to perform work.
Motors are commonly used in various applications such as electric vehicles, industrial machinery, and household appliances.
They come in different types such as AC motors, DC motors, and stepper motors.
Motor capacity refers to its power rating, typically measured in horsepower (HP) or kilowatts (kW).
Higher capacity motors can gene...
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 Company Website and was interviewed before Dec 2022. There were 4 interview rounds.
I am an experienced Electrical Engineer with a passion for designing and implementing innovative solutions.
I have a strong background in electrical engineering, with a focus on power systems and control systems.
I have successfully designed and implemented electrical systems for various projects, including commercial buildings and industrial plants.
I am skilled in using CAD software for electrical design and have experi...
I can provide the required documents and discuss salary and joining details.
I can provide all necessary documents such as resume, certifications, and transcripts.
My current base salary is $X per year.
I expect a base salary in the range of $Y to $Z per year.
I am available to join within X weeks/months.
I can discuss further details during the interview.
posted on 26 Mar 2024
I applied via Walk-in and was interviewed before Mar 2023. There was 1 interview round.
CT stands for Current Transformer and PT stands for Potential Transformer. They are used in electrical systems for measurement and protection purposes.
CT is used to measure current in high voltage circuits by stepping down the current to a safe level for measurement.
PT is used to measure voltage in high voltage circuits by stepping down the voltage to a safe level for measurement.
Both CT and PT are essential components...
DTC structure stands for Direct Torque Control structure, a control method used in AC motor drives for precise torque and speed control.
DTC structure is a control technique used in AC motor drives to directly control torque and flux without the need for a separate speed controller.
It is based on the principle of controlling the torque and flux by selecting the appropriate voltage vectors in the motor.
DTC structure offe...
LA, AB switch is used in electrical engineering to switch between two different signal sources or destinations.
LA, AB switch is commonly used in audio and video equipment to switch between different inputs or outputs.
It allows for easy switching between two different signal sources or destinations without having to physically disconnect and reconnect cables.
The switch typically has two positions - one for each signal s...
posted on 12 Jul 2022
I applied via Walk-in
30 questions in 30 minutes question from machine and power system
I applied via Referral and was interviewed before Apr 2022. There was 1 interview round.
posted on 3 Jul 2021
I applied via Company Website and was interviewed in Jun 2021. There was 1 interview round.
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