50+ Hitachi Interview Questions and Answers

Reconciliation is the process of comparing two sets of records to ensure their accuracy and consistency.

• Reconciliation is a financial term used to verify and match transactions between two accounts or statements.

• It helps identify discrepancies, errors, or missing entries in the records.

• Types of reconciliation include bank reconciliation, account reconciliation, and intercompany reconciliation.

• Bank reconciliation involves comparing bank statements with the company's records to...read more

Accounts refer to financial records that track the flow of money in and out of a business. They are important for financial management.

• Accounts are used to track financial transactions such as sales, expenses, and payments.

• They help businesses keep track of their financial health and make informed decisions.

• Accounts are important for tax purposes and for meeting legal requirements.

• Examples of accounts include cash, accounts receivable, accounts payable, and inventory.

• Proper a...read more

Reconciliation involves identifying and resolving differences between two parties.

• Identify the differences between the parties involved

• Communicate with the other party to understand their perspective

• Find common ground and negotiate a solution

• Agree on a plan of action to move forward

• Follow up to ensure the plan is being implemented and effective

Error transactions can be rectified by identifying the cause and taking appropriate corrective actions.

• Identify the cause of the error transaction

• Determine the appropriate corrective action

• Implement the corrective action

• Ensure the error transaction is properly documented for future reference

Bank reconciliation is the process of comparing a company's financial records with those of its bank to ensure accuracy.

• Bank reconciliation involves matching transactions in a company's accounting records with those in its bank statement.

• Any discrepancies are identified and investigated, such as outstanding checks or deposits in transit.

• The goal is to ensure that the company's cash balance in its accounting records matches the balance in its bank account.

• Bank reconciliation i...read more

ATM reconciliation is the process of ensuring that the amount of cash in an ATM matches the amount recorded in the bank's books.

• ATM reconciliation involves comparing the cash dispensed by the ATM with the transactions recorded in the bank's system.

• Any discrepancies are investigated and resolved to ensure that the ATM balance matches the bank's balance.

• ATM reconciliation is typically done on a daily basis to ensure accuracy and prevent fraud.

• Automated tools can be used to stre...read more

Isolation levels determine the level of visibility of changes made by other transactions.

• Isolation levels include Read Uncommitted, Read Committed, Repeatable Read, and Serializable.

• The default isolation level in most databases is Read Committed.

• To specify a different isolation level, you can use SQL statements like SET TRANSACTION ISOLATION LEVEL in SQL Server or SET TRANSACTION in Oracle.

Bank reconciliation is the process of comparing a company's bank statement with its own financial records.

• It helps to identify any discrepancies between the two records.

• It ensures that all transactions are accurately recorded in the company's books.

• It involves matching the transactions on the bank statement with the transactions in the company's accounting system.

• Any differences between the two records are investigated and resolved.

• Bank reconciliations are typically done on a...read more

Error transaction refers to a failed or incorrect transaction that did not complete successfully.

• It can occur due to various reasons such as insufficient funds, incorrect account details, technical issues, etc.

• Error transactions can result in loss of money or delay in processing.

• Examples include failed ATM withdrawals, declined credit card payments, and unsuccessful online transfers.

Normalization in SQL is the process of organizing data in a database to reduce redundancy and improve data integrity. A cursor in SQL is a database object used to retrieve and manipulate data row by row.

• Normalization in SQL involves breaking down a large table into smaller tables and defining relationships between them to reduce redundancy.

• Cursors in SQL are used to fetch and process individual rows returned by a query.

• Example of normalization: dividing a 'customer' table int...read more

CNC stands for Computer Numerical Control. It is a manufacturing process that uses computerized systems to control machine tools.

• CNC is a manufacturing process that automates the operation of machine tools.

• It uses computerized systems to control the movement and operation of the tools.

• CNC machines are programmed with specific instructions to perform precise cutting, drilling, or shaping operations.

• The instructions are typically created using CAD/CAM software and converted int...read more

Steps involved in creating a database table

• Define the table name and columns with data types

• Set primary key and any constraints

• Specify relationships with other tables if needed

• Create the table using SQL query

• Test the table by inserting and querying data

Communicating with customers is crucial for understanding their needs and providing excellent service.

• Listen actively to their concerns and feedback

• Use clear and concise language to avoid confusion

• Be empathetic and understanding of their perspective

• Provide timely and effective solutions to their problems

• Follow up to ensure their satisfaction and loyalty

Cybersecurity involves protecting computer systems, networks, and data from cyber attacks.

• Cybersecurity focuses on preventing unauthorized access, data breaches, and other cyber threats.

• It includes measures such as firewalls, encryption, antivirus software, and regular security audits.

• Cybersecurity professionals work to identify vulnerabilities and implement solutions to protect against cyber attacks.

• Examples of cyber attacks include malware, phishing, ransomware, and denial ...read more

The number of tools used in CNC machining varies depending on the complexity of the project and the machine capabilities.

• The number of tools used in CNC machining can range from a few to hundreds, depending on the requirements of the project.

• Different tools are used for different operations such as drilling, milling, turning, and cutting.

• The selection of tools depends on factors like material type, desired finish, tolerances, and production volume.

• Tool changers are often used...read more

I use various types of gauges depending on the specific engineering task at hand.

• I use pressure gauges to measure fluid pressure in hydraulic systems.

• I use temperature gauges to monitor the temperature of machinery and equipment.

• I use strain gauges to measure the deformation or strain of materials under load.

• I use flow meters to measure the flow rate of liquids or gases in pipelines.

• I use level gauges to determine the level of liquid in tanks or vessels.

• I use force gauges to ...read more

Steps to create APIs involve planning, designing, implementing, testing, and documenting.

• Plan the API functionality and endpoints

• Design the API structure and data formats

• Implement the API using programming languages and frameworks

• Test the API for functionality, performance, and security

• Document the API for developers to understand its usage

SQL joins (Inner, Left, Right, Full) are used to combine rows from two or more tables based on a related column between them.

• Inner join: Returns rows when there is at least one match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full join: Returns rows when there is a match in one of the tables.

There are several types of transformers including power, distribution, isolation, autotransformer, and instrument transformer.

• Power transformers are used in transmission and distribution systems.

• Distribution transformers are used to step down voltage for use in homes and businesses.

• Isolation transformers are used to isolate circuits from each other.

• Autotransformers are used to step up or step down voltage.

• Instrument transformers are used to measure voltage and current in high...read more

APM stands for Application Performance Management, which is the monitoring and management of performance and availability of software applications.

• APM tools help in identifying and resolving performance issues in real-time

• It provides insights into user experience, application dependencies, and overall performance

• Examples of APM tools include New Relic, Dynatrace, and AppDynamics

Inner join returns only the rows that have matching values in both tables, while outer join returns all rows from both tables.

• Inner join: returns rows with matching values in both tables

• Outer join: returns all rows from both tables, with NULL values where there is no match

• Example: Inner join - SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id

• Example: Outer join - SELECT * FROM table1 LEFT OUTER JOIN table2 ON table1.id = table2.id

MSDAC system stands for Modular Signal Distribution and Acquisition System.

• MSDAC system is used in railway signaling to distribute and acquire signals from various sources.

• It consists of modular units that can be easily configured and expanded as per the requirements.

• The system uses a redundant architecture to ensure high availability and reliability.

• MSDAC system can work with various types of signaling systems such as axle counters, track circuits, and train detection system...read more

Poka yoke is a technique used in manufacturing to prevent errors or defects by implementing foolproof mechanisms.

• Poka yoke is a Japanese term meaning 'mistake-proofing' or 'error-proofing'.

• It involves designing processes or tools in a way that makes it impossible or difficult for errors to occur.

• Poka yoke techniques can be physical, visual, or auditory.

• Examples of poka yoke include using sensors to detect errors, using color-coding or labeling to prevent mix-ups, or using che...read more

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types.

• Examples include method overloading and method overriding in object-oriented programming.

Const keyword is used to declare constants at compile time, while read-only keyword is used to create immutable fields that can only be assigned a value at runtime.

• Const values are determined at compile time and cannot be changed, while read-only values can only be assigned a value once at runtime.

• Const fields are implicitly static, while read-only fields are not.

• Example: const int x = 5; read-only int y = 10;

Sample query to join tables using SQL

• Use the JOIN keyword to combine rows from two or more tables based on a related column between them

• Specify the columns to be selected from each table

• Use the ON keyword to specify the join condition

Ansible playbook creation and execution

• Ansible is a tool used for automation and configuration management

• Playbooks are written in YAML format and define tasks to be executed

• Execution of playbooks can be done using the 'ansible-playbook' command

• Playbooks can be used for various tasks such as server provisioning, application deployment, etc.

Multi threading is the ability of a CPU to execute multiple threads concurrently.

• Allows for parallel execution of tasks, improving performance

• Each thread has its own stack and runs independently

• Threads can communicate and synchronize using shared memory

• Examples: running multiple tasks simultaneously in a web server, processing data in parallel

Lcc design refers to the design of a Line Commutated Converter used in high voltage direct current transmission systems. Transformer design involves designing transformers for various applications.

• Lcc design involves selecting the appropriate valves, capacitors, and inductors for the converter.

• Transformer design includes determining the core material, winding configuration, and insulation for efficient power transfer.

• Applications of transformer design include power distributi...read more

Work at height depends on the safety regulations and equipment used.

• Work at height should be done only after proper risk assessment and safety measures are in place.

• The height limit for work at height varies depending on the country and industry regulations.

• In the construction industry, work at height is generally considered to be at a height of 2 meters or more.

• The use of safety equipment such as harnesses, guardrails, and safety nets can increase the height limit for work a...read more

Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• Abstract classes can have constructors, fields, and non-abstract methods along with abstract methods

• Interfaces can only have abstract methods and constants

• A class can implement multiple interfaces but can only inherit from one abstract class

Implementing lean manufacturing principles, optimizing production processes, and reducing material waste can help save company wastage.

• Implement lean manufacturing principles to reduce waste in production processes

• Optimize production schedules to minimize downtime and maximize efficiency

• Reduce material waste by implementing recycling and reusing strategies

• Regularly review and analyze production data to identify areas of improvement

• Train employees on waste reduction techniques...read more

Improving knowledge requires continuous learning and seeking new experiences.

• Read books and articles on relevant topics

• Attend workshops, seminars, and conferences

• Take online courses and tutorials

• Join professional organizations and networking groups

• Seek mentorship and guidance from experienced professionals

• Engage in hands-on learning and experimentation

• Reflect on past experiences and learn from mistakes

• Stay up-to-date with industry trends and advancements

A braking system is a mechanism that slows or stops the motion of a vehicle or machine.

• Braking systems convert kinetic energy into heat energy to slow or stop a vehicle or machine.

• There are several types of braking systems, including disc brakes, drum brakes, and regenerative brakes.

• Disc brakes use calipers to squeeze brake pads against a rotor, while drum brakes use shoes that press against a rotating drum.

• Regenerative brakes use the vehicle's momentum to generate electricit...read more

Increasing productivity can be achieved through efficient processes, employee training, automation, and continuous improvement.

• Implement lean manufacturing principles to streamline processes

• Invest in employee training and development to enhance skills and knowledge

• Utilize automation and technology to eliminate manual tasks and improve efficiency

• Encourage a culture of continuous improvement to identify and address inefficiencies

• Set clear goals and targets to motivate employees...read more

Product quality can be controlled through implementing quality control processes, conducting regular inspections, using quality management systems, and continuous improvement efforts.

• Implementing quality control processes to ensure products meet specifications and standards

• Conducting regular inspections at various stages of production to identify and address any quality issues

• Utilizing quality management systems such as ISO standards to establish and maintain quality processe...read more

A cyclo converter is a type of power electronic circuit that converts AC power to variable frequency AC power.

• Converts AC power to variable frequency AC power

• Used in applications where variable speed control is required

• Consists of multiple thyristors arranged in a specific configuration

• Commonly used in industries like steel rolling mills and cement kilns

Code to print most repeated string in array

• Iterate through array and count occurrences of each string

• Store counts in a dictionary

• Find the string with the highest count

Capacitors store and release electrical energy in electronic circuits.

• Capacitors store electrical energy in an electric field

• They can release the stored energy when needed

• Capacitors are used in filtering, timing, tuning, and power factor correction in electronic circuits

UPS provides backup power instantly during power outages, while inverters convert DC power to AC power.

• UPS stands for Uninterruptible Power Supply and provides instant backup power during power outages.

• Inverters convert DC power from batteries or solar panels to AC power for use in homes or businesses.

• UPS typically have a battery backup system, while inverters may or may not have a battery backup.

• UPS are commonly used for critical equipment like computers, servers, and medica...read more

Sanity testing is a narrow and deep testing to ensure that the most crucial functionalities work correctly, while smoke testing is a broad and shallow testing to check if the software build is stable enough for further testing.

• Sanity testing focuses on specific areas of the application to ensure that the critical functionalities are working as expected.

• Smoke testing is a preliminary test to check if the software build is stable enough for further testing.

• Sanity testing is usu...read more

DT stands for Destructive Testing, which involves damaging a sample to understand its properties. NDT stands for Non-Destructive Testing, which allows testing without damaging the sample.

• DT involves damaging the sample to understand its properties

• NDT allows testing without damaging the sample

• Examples of NDT methods include ultrasonic testing, radiographic testing, and magnetic particle testing

Selenium is a popular open-source automation testing tool used for web application testing.

• Selenium is used for automating web browsers to test web applications.

• It supports multiple programming languages like Java, Python, C#, etc.

• Selenium WebDriver is the most commonly used component for writing test scripts.

• Selenium IDE is a record and playback tool for creating quick test scripts.

• Selenium Grid allows running tests on different machines in parallel.

• Selenium can interact wit...read more

A NAC tool, or Network Access Control tool, is a security solution that enforces security policies on devices seeking to access a network.

• NAC tools authenticate users and devices before granting access to the network

• They can enforce security policies such as antivirus software requirements or patch levels

• Examples of NAC tools include Cisco ISE, Aruba ClearPass, and ForeScout CounterACT

Test design techniques are methods used to create test cases and scenarios for software testing.

• Black box testing: Testing based on external behavior without knowledge of internal code.

• White box testing: Testing based on internal code structure and logic.

• Equivalence partitioning: Dividing input data into partitions to ensure thorough testing.

• Boundary value analysis: Testing at the boundaries of input ranges to uncover potential issues.

• Decision table testing: Creating a table ...read more

Yes, I am able to multitask effectively in order to handle multiple tasks simultaneously.

• I have experience juggling multiple projects and deadlines in my previous roles

• I prioritize tasks based on urgency and importance

• I am able to switch between tasks seamlessly without compromising on quality

• I use tools like to-do lists and calendars to stay organized and on track

Mura Muda is a concept in Lean manufacturing that refers to unevenness and waste in the production process.

• Mura refers to unevenness or inconsistency in production processes, which can lead to inefficiencies and delays.

• Muda refers to waste, such as overproduction, excess inventory, or unnecessary movement of materials.

• Identifying and eliminating Mura and Muda is essential for improving productivity and reducing costs in manufacturing.

• For example, implementing Just-In-Time pro...read more

Cypress is a JavaScript-based end-to-end testing framework for web applications.

• Cypress allows for easy and fast testing of web applications

• It provides a clean and simple syntax for writing tests

• Cypress can simulate user interactions and test the application's functionality

• It has built-in support for debugging and time-travel features

UPS stands for Uninterruptible Power Supply, a device that provides emergency power to a load when the input power source fails.

• UPS ensures continuous power supply during power outages

• It protects electronic devices from power surges and fluctuations

• UPS can be used for computers, servers, networking equipment, and other critical devices

SLT stands for SAP Landscape Transformation, a real-time data replication tool used to replicate and transform data from source systems to target systems.

• SLT is used for real-time data replication from source systems to target systems.

• It allows for data transformation during replication.

• SLT is commonly used in SAP HANA implementations.

• It helps in integrating data from multiple sources into a single system.

I would sell by understanding the customer's needs, building rapport, showcasing product benefits, and closing with a strong call to action.

• Listen actively to the customer to understand their needs and pain points.

• Highlight the unique features and benefits of the product that align with the customer's needs.

• Build rapport and trust with the customer through effective communication and empathy.

• Use persuasive language and storytelling to create a sense of urgency and value for t...read more

Reverse a given string

• Use a loop to iterate through the characters of the string

• Swap the characters from start to end to reverse the string

• Alternatively, use built-in functions like reverse() in some programming languages

Split a string into an array of strings based on a specified delimiter

• Use the split() method in programming languages like JavaScript, Python, or Java

• Specify the delimiter as an argument to the split() method

• Example: 'Hello,World' split(',') would result in ['Hello', 'World']