Hitachi Hi-Rel Power Electronics Interview Questions, Process, and Tips

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Q1. What is K factor used for sheet metal ?
Ans. 
K factor is a constant used in sheet metal bending to calculate the location of the bend line.
• K factor determines the amount of stretching that occurs when a metal sheet is bent.

• It is used in formulas to calculate the bend allowance, bend deduction, and flat pattern development.

• K factor values vary depending on material type, thickness, and bending method.

• For example, a K factor of 0.33 is commonly used for mild steel
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Q2. How to find weight of any object ?
Ans. 
The weight of an object can be found by using a scale or balance.
• Use a scale or balance to measure the weight of the object.

• Place the object on the scale and wait for the reading to stabilize.

• The weight of the object will be displayed on the scale in units such as pounds or kilograms.
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Q1. What is ups, tell in the block diagram
Ans. 
UPS stands for Uninterruptible Power Supply, which is a device that provides emergency power to a load when the input power source fails.
• UPS takes power from the main electrical supply and stores it in its battery

• It then converts the stored power to the required voltage and frequency to supply to the load

• UPS also provides protection against power surges and spikes

• Example: APC Smart-UPS series
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Q2. How to rectifier and inverter section work
Ans. 
Rectifier and inverter sections are components of power electronics that convert AC to DC and DC to AC respectively.
• Rectifier section converts AC to DC by using diodes

• Inverter section converts DC to AC by using transistors

• Rectifier section is used in power supplies, battery chargers, etc.

• Inverter section is used in solar power systems, UPS, etc.
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Q3. How to convert 230v ac supply into 12v dc supply.describe with proper circuit diagram
Ans. 
To convert 230V AC supply into 12V DC supply, a step-down transformer, rectifier, and filter capacitor are used in the circuit.
• Use a step-down transformer to reduce the voltage from 230V AC to a lower voltage level.

• Rectify the AC voltage using a bridge rectifier to convert it into pulsating DC.

• Filter the pulsating DC using a capacitor to smoothen out the ripples and obtain a stable 12V DC output.

• Ensure proper voltage r...read more
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Q4. About all types of batteries i.e Ni-cd,VRLA,LEAD acid Smfb planet batteries etc
Ans. Ni-cd nickel cadmium batteries. In this batterie construction and charging discharging. Sealed Maintenance-Free (SMF) batteries SMF batteries are commonly known as VRLA (Valve-Regulated Lead-Acid) batteries. They are called “maintenance-free” because they are sealed and do not require regular watering. LEAD- The lead is submerged into the sulphuric acid to allow a controlled chemical reaction.
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Q5. Supply chain management
Ans. Supply chain management is the management of the flow of goods and services and includes all processes that transform raw materials into final products. It involves the active streamlining of a business's supply-side activities to maximize customer value and gain a competitive advantage in the marketplace.
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Q1. Block diagram of UPS
Ans. 
A UPS block diagram typically consists of input power, rectifier, battery, inverter, output power, and load.
• Input power from utility or generator

• Rectifier converts AC to DC

• Battery stores energy for backup power

• Inverter converts DC to AC

• Output power to connected devices

• Load consumes power from UPS
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Q2. Difference Between MOSFET / IGBT / SCR
Ans. 
MOSFET, IGBT, and SCR are all types of power semiconductor devices used for switching applications.
• MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a voltage-controlled device with high switching speed and efficiency.

• IGBT (Insulated Gate Bipolar Transistor) combines the advantages of MOSFET and bipolar transistor, suitable for high power applications.

• SCR (Silicon-Controlled Rectifier) is a current-controll...read more
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Q1. Why do you want to switch from parent company.
Ans. 
Seeking new challenges and growth opportunities in a different environment.
• Desire for new challenges and opportunities for growth

• Different work culture and environment

• Opportunity to learn new technologies and skills

• Possibility of career advancement

• Seeking better work-life balance
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Q2. Salary expectation?
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Q1. 1. Personal Introduction and Work Experience Description. 2. In depth industry knowledge. 3. MD level discussion
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