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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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I was interviewed before May 2016.
A multimeter is an electronic device used to measure voltage, current, and resistance in electrical circuits.
It can measure AC and DC voltage
It can measure AC and DC current
It can measure resistance
It can also measure other electrical parameters such as capacitance and frequency
It typically has a digital display for easy reading
Examples of multimeter brands include Fluke, Klein Tools, and Extech
I applied via Company Website and was interviewed in Jan 2022. There were 2 interview rounds.
I applied via Naukri.com and was interviewed in Jan 2021. There was 1 interview round.
Gate 2017 test for appti. bsnsn
I applied via Campus Placement and was interviewed before Feb 2023. There were 2 interview rounds.
Basic math and quantitative aptitude related questions
The company is a leading technology firm specializing in software development and engineering solutions.
Founded in 2005 by a group of software engineers
Provides services in web development, mobile app development, and cloud computing
Clients include Fortune 500 companies such as Google and Microsoft
I applied via Campus Placement
I applied via Newspaper Ad and was interviewed before Apr 2021. There were 3 interview rounds.
Hard work versus smart work.
The power plug earth wire is bigger in size to ensure safety and prevent electrical shocks.
The earth wire provides a path for the current to flow in case of a fault or short circuit.
A larger wire size reduces resistance and allows for the safe dissipation of excess current.
It helps to protect individuals and equipment from electric shock hazards.
The earth wire is connected to the ground, which acts as a reference point...
Copper (Cu) conductor will take larger current than Aluminum (Al) conductor of the same size.
Copper has a higher electrical conductivity than Aluminum.
Copper has a lower resistivity than Aluminum.
Copper has better thermal conductivity than Aluminum.
Copper is more commonly used in high-current applications.
Aluminum is often used in overhead power transmission lines due to its lighter weight.
Pulse width modulation (PWM) is a technique used in VFD to control the speed of the motor by adjusting the width of the pulses of voltage supplied to the motor.
PWM is a method of controlling the amount of power delivered to a load without changing the voltage level.
In VFD, PWM is used to control the speed of the motor by varying the width of the pulses of voltage supplied to the motor.
The width of the pulses is control...
Testing of transformers involves various electrical tests to ensure proper functioning and safety.
One common test is the turns ratio test to verify the turns ratio of primary and secondary windings.
Another test is the insulation resistance test to check for any insulation breakdown.
Short circuit test is performed to determine the copper losses in the transformer.
Open circuit test is done to measure the core losses in t...
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