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I applied via Referral and was interviewed before Feb 2022. There were 3 interview rounds.
I applied via Company Website and was interviewed before Dec 2021. There were 2 interview rounds.
Rectifier converts AC to DC while Inverter converts DC to AC.
Rectifier section uses diodes to convert AC to DC.
Inverter section uses transistors to convert DC to AC.
Rectifier section is used in power supplies while Inverter section is used in UPS.
Rectifier section is used in welding machines while Inverter section is used in air conditioners.
Both sections are used in electric vehicles to convert power from battery to m
Harmonics are electrical voltages or currents that are multiples of the fundamental frequency.
Harmonics can cause problems in electrical systems, such as overheating of equipment and interference with communication systems.
They are often caused by non-linear loads, such as computers, variable speed drives, and LED lighting.
Harmonic distortion can be measured using a power quality analyzer.
Mitigation techniques include ...
I applied via Referral and was interviewed before Oct 2021. There were 3 interview rounds.
Hitachi Hi-Rel Power Electronics interview questions for popular designations
I applied via Company Website and was interviewed in May 2021. There were 3 interview rounds.
Get interview-ready with Top Hitachi Hi-Rel Power Electronics Interview Questions
I applied via Approached by Company and was interviewed before Aug 2021. There were 4 interview rounds.
UPS stands for Uninterruptible Power Supply. It is an electrical device that provides emergency power to a load when the input power source fails.
UPS is used to protect critical equipment from power outages, voltage fluctuations, and other power-related issues.
It consists of three main components: a battery, an inverter, and a charger.
The battery stores energy and provides power to the load when the input power source ...
THD stands for Total Harmonic Distortion in UPS.
THD is a measure of the distortion of the electrical signal in a UPS.
It is expressed as a percentage of the fundamental frequency.
Lower THD values indicate a cleaner and more stable power output.
THD can affect the performance and lifespan of connected equipment.
For example, a UPS with a THD of less than 5% is considered good.
Isolation transformer in UPS provides electrical isolation between the input and output, protecting equipment from electrical noise and surges.
Isolation transformer separates the input and output circuits of the UPS.
It protects equipment from electrical noise and surges.
It also provides a safety barrier between the utility power and the equipment.
Isolation transformer can improve the quality of power by reducing harmon...
I applied via Naukri.com and was interviewed in Sep 2020. There were 4 interview rounds.
A step-down transformer is used to convert 230 V AC to 12 V AC, which is then rectified using a bridge rectifier and filtered using a capacitor to obtain 12 V DC.
Use a step-down transformer to reduce the voltage from 230 V AC to 12 V AC
Rectify the AC voltage using a bridge rectifier
Filter the rectified voltage using a capacitor
Use a voltage regulator to regulate the output voltage to 12 V DC
Use appropriate diodes and c...
I applied via Company Website and was interviewed in Jul 2019. There were 5 interview rounds.
I applied via Approached by Company and was interviewed in Apr 2018. There was 1 interview round.
Different types of batteries used in various applications.
Alkaline batteries: commonly used in household devices like remote controls
Lithium-ion batteries: used in smartphones, laptops, and electric vehicles
Lead-acid batteries: used in cars, motorcycles, and uninterruptible power supplies
Nickel-metal hydride (NiMH) batteries: used in digital cameras and portable electronics
Zinc-carbon batteries: commonly found in flash
I applied via Approached by Company and was interviewed in Apr 2018. There was 0 interview round.
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The duration of Hitachi Hi-Rel Power Electronics interview process can vary, but typically it takes about less than 2 weeks to complete.
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