Hitachi Hi-Rel Power Electronics Interview Questions and Answers

Q1. Type of electrical panel
Ans. 
Electrical panels distribute and control electrical power in buildings, ensuring safety and efficiency.
• Main Distribution Panel: Central hub for electrical distribution, e.g., in commercial buildings.

• Subpanel: Secondary panel that distributes power to specific areas, e.g., a garage or workshop.

• Load Center: A type of panel that houses circuit breakers for residential use.

• Transfer Switch: Used for switching between utilit...read more
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Q2. Type of electrical panel wiring
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Electrical panel wiring includes various types for distribution, control, and safety in electrical systems.
• 1. Main Distribution Panel: Central hub for electrical distribution in a building.

• 2. Subpanels: Smaller panels that distribute power to specific areas or circuits.

• 3. Circuit Breaker Panels: Protect circuits from overloads and short circuits.

• 4. Load Centers: Manage and distribute electrical loads efficiently.

• 5. Mot...read more
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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 ...read more
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Q2. How to find weight of any object ?
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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
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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
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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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