Hitachi Engineer- Customer Support Interview Questions and Answers

Q1. Difference between normalisation and de-normalisation?
Ans. 
Normalization is the process of organizing data in a database while denormalization is the process of intentionally introducing redundancy into a database.
• Normalization is used to minimize data redundancy and improve data integrity.

• Denormalization is used to improve query performance by reducing the number of joins needed.

• Normalization involves breaking down a table into smaller tables and establishing relationships be...read more
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Q2. Write code logic for Fibonacci series?
Ans. 
Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Declare variables for first two numbers of the series

• Loop through the series and calculate the next number by adding the previous two

• Store the result in an array or print it

• Repeat until desired number of terms is reached
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Q3. Types of inheritance with real time example?
Ans. 
Types of inheritance include single, multiple, multilevel, hierarchical, hybrid, and multipath inheritance.
• Single inheritance: A child class inherits from a single parent class.

• Multiple inheritance: A child class inherits from multiple parent classes.

• Multilevel inheritance: A child class inherits from a parent class, which in turn inherits from another parent class.

• Hierarchical inheritance: Multiple child classes inher...read more
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Q4. Oops concepts - difference between object and class?
Ans. 
Object is an instance of a class while class is a blueprint for creating objects.
• Class is a template or blueprint for creating objects

• Object is an instance of a class

• Class defines the properties and methods that an object will have

• Object is created from a class using the 'new' keyword

• Multiple objects can be created from a single class
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Q1. What are your strengths and weaknesses?
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Q2. Tell me about yourself.
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They asked about corona

Q1. Discussed with field work profile
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Q1. What do you know about company Technical questions and the subject you say
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Q1. Introduction to self Why do you want to join this company
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The GD was good they give you current topic and questions related to that

Q1. Tell me about yourself
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Q2. What is role and responsibilities of leader
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Q1. Tell me about yourself
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Q2. What is mechanical design
Ans. 
Mechanical design is the process of creating physical products and systems using engineering principles and techniques.
• Involves designing components and assemblies for machines, vehicles, structures, etc.

• Requires knowledge of materials, manufacturing processes, and CAD software.

• Focuses on functionality, safety, and efficiency of the design.

• Examples include designing a car engine, a robotic arm, or a bridge structure.
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Q3. What is shear stress
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Shear stress is a type of stress that acts parallel to a surface, causing layers of material to slide past each other.
• Shear stress is caused by forces applied parallel to a surface, leading to deformation.

• It is calculated as force divided by the area over which the force is applied.

• Shear stress is commonly seen in materials like fluids, where layers move at different speeds.

• Examples include cutting paper with scissors,...read more
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Q4. What are categories of strength in machine design
Ans. 
Categories of strength in machine design include static strength, fatigue strength, impact strength, and toughness.
• Static strength: Ability to withstand a constant load without breaking.

• Fatigue strength: Ability to withstand repeated loading over time.

• Impact strength: Ability to withstand sudden shocks or impacts.

• Toughness: Ability to absorb energy and deform without fracturing.
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My gd topic was Big data

Q1. Introduction, resume-based
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Q2. Projects and intenship
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Q3. Also study the core subjects like os
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