ABB Interview Questions, Process, and Tips

Aptitude and logical questions

Q1. What is inheritance in oops?
Ans. 
Inheritance in OOP allows a class to inherit properties and behaviors from another class.
• Inheritance promotes code reusability by allowing a new class to take on the attributes and methods of an existing class.

• The class that is being inherited from is called the parent class or superclass, while the class that inherits is called the child class or subclass.

• Subclasses can add new methods or override existing methods fro...read more
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Q2. What is virtual function?
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A virtual function is a function in a base class that is declared using the keyword 'virtual' and can be overridden by a function in a derived class.
• Virtual functions allow a derived class to provide a specific implementation of a function that is already defined in a base class.

• They enable polymorphism, where a function call is resolved at runtime based on the actual type of object being referred to.

• Virtual functions ...read more
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Q3. What is difference between array and liked list?
Ans. 
Arrays store elements in contiguous memory locations, while linked lists store elements in nodes with pointers to the next node.
• Arrays have fixed size, while linked lists can dynamically grow or shrink.

• Accessing elements in arrays is faster (O(1)), while accessing elements in linked lists is slower (O(n)).

• Inserting or deleting elements in arrays can be inefficient as it may require shifting elements, while in linked li...read more
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Q4. What is stack? and to implement it?
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A stack is a data structure that follows the Last In, First Out (LIFO) principle.
• Stack is a collection of elements with two main operations: push (adds an element to the top) and pop (removes the top element).

• Common implementations of stack include using arrays or linked lists.

• Example: Pushing elements 1, 2, and 3 onto a stack would result in 3 being at the top, followed by 2, and then 1.
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Q5. What is string function in structures?
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String function in structures refers to operations that can be performed on string data within a data structure.
• String functions in structures can include operations like concatenation, substring extraction, searching, and comparison.

• For example, a structure may have a string member representing a person's name, and string functions can be used to manipulate or extract parts of the name.

• These functions can help in orga...read more
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Q1. Tell me about yourself
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Q2. Elaborate your professional background
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Q1. Brif abour yourself
Ans. 
I am a dedicated QA QC Engineer with a strong background in quality assurance and control processes.
• Experienced in conducting quality inspections and audits

• Skilled in creating and implementing quality control procedures

• Proficient in using testing tools and software

• Strong analytical and problem-solving skills

• Excellent communication and teamwork abilities
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Q2. Why you left pervious company
Ans. 
Seeking new challenges and opportunities for growth.
• Desire for career advancement

• Looking for new challenges

• Seeking better work-life balance

• Company restructuring or downsizing

• Relocation to a new area
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Q1. Explain Order of execution in SQL
Ans. 
Order of execution in SQL determines the sequence in which different clauses are processed in a query.
• SQL query is processed in the following order: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.

• FROM clause is processed first to retrieve data from tables.

• WHERE clause filters the data based on specified conditions.

• GROUP BY clause groups the data based on specified columns.

• HAVING clause filters the grouped data.

• SELECT ...read more
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Q2. Sumifs function
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Q3. Boxplots?Histograms?
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