Hitachi Interview Questions, Process, and Tips for Experienced

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 ineff...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

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 a...read more

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 ...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

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...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

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