Wabtec QA Engineer Interview Questions and Answers

Q1. Postman details, what are variable ?
Ans. 
Variables in Postman are placeholders that can be used to store and reuse values in requests and scripts.
• Variables in Postman are denoted by enclosing them in double curly braces like {{variable_name}}

• Variables can be defined at different scopes such as global, environment, and local

• Variables can be used to store values like API keys, tokens, and dynamic data

• Variables can be dynamically updated using scripts or pre-req
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Q1. SQL in depth Different types of join
Ans. 
Different types of SQL joins include inner join, left join, right join, and full outer join.
• Inner join: Returns rows when there is a 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 outer join: Returns rows when there is a match in either table
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Q1. CI/ CD Pipeline
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Q2. Agile methodlogies
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Q1. Expected salary
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Q2. Ready to work in Hybdrid model
Ans. 
Yes, I am ready to work in a hybrid model.
• I have experience working in both remote and on-site environments.

• I am comfortable using collaboration tools like Slack, Zoom, and Jira.

• I am adaptable and can easily switch between working from home and in the office.
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Q1. Abstract class vs interface
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Abstract class is a class that can have both abstract and non-abstract methods, while an interface is a blueprint for a class that only contains abstract methods.
• Abstract class can have constructor while interface cannot.

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

• Abstract class can have access modifiers for its members, while interface cannot.

• Interfaces are used to achieve mu...read more
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Q2. String programs
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Q1. Basic situation handelling questions
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Q1. Why main method is static
Ans. 
The main method is static in Java because it needs to be called by the JVM without creating an instance of the class.
• Static methods can be called without creating an instance of the class.

• The main method is the entry point of a Java program, so it needs to be accessible without creating objects.

• Having the main method as static ensures that it can be called by the JVM before any objects are created.
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Q2. Can we overload construction
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Overloading construction is possible in programming by defining multiple functions with the same name but different parameters.
• In programming, overloading construction refers to defining multiple functions with the same name but different parameters.

• The compiler determines which function to call based on the number and types of arguments passed to it.

• For example, you can have multiple functions named 'calculate' that a...read more
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Q1. About motor windings Types of capacitors
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Q2. Electrical circuits
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Logical,reasoning and blood relationship related questions were given for the test

Q1. What is you name
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Q2. What is plc how it is different from other microcontrollers
Ans. 
PLC stands for Programmable Logic Controller, used for industrial automation. It is different from other microcontrollers in terms of design, functionality, and applications.
• PLCs are specifically designed for industrial automation tasks, such as controlling machinery on a factory assembly line.

• PLCs are more robust and reliable than general-purpose microcontrollers, as they are built to withstand harsh industrial enviro...read more
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Q1. About the signaling system
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About the safety for at a time of working