Qatar Petroleum E&I Technician Interview Questions and Answers

Q1. Explain All the laws of Thermodynamics
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The laws of thermodynamics are fundamental principles governing energy and heat transfer in physical systems.
• First Law: Energy cannot be created or destroyed, only transferred or converted.

• Second Law: Heat naturally flows from hot to cold objects, and entropy tends to increase over time.

• Third Law: As temperature approaches absolute zero, entropy approaches a minimum value.

• Examples: A car engine converting fuel into mot...read more
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Q2. One should have good Engineeringskills
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Q1. Salary Expectation
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Asked Real Time Scenario to create Microservice for Train and Station information. The interviewer asked what are the properties needs to be considered for evaluating service.

Core Java 11 questions: Webservices, Improvement in JVM, Threads

Java 8: Asked to write a program based on Group By Scenario.

The interview lasts around 2 hrs.

Q1. Managerical round: Asked about current project details, The reason to join BH, Scenario based question on LinkedList vs ArrayList
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Q1. It was easy. The HR told about company policies
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Q1. Core Java, spring jpa, relationship like one to one, one to many, many to oneetc, composit key. More important many questions come from your cv like what you did in your project
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Q1. Just basic behaviour questions, also be ready with some technical questions as well
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Q1. Only joining discussion and formalities 😃😃
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Q1. What is oops, explain them?
Ans. 
Object-oriented programming (OOP) is a programming paradigm that uses objects to represent and manipulate data.
• OOP is based on the concept of classes and objects.

• It allows for encapsulation, inheritance, and polymorphism.

• Encapsulation hides the internal details of an object and provides a public interface.

• Inheritance allows classes to inherit properties and methods from other classes.

• Polymorphism allows objects of diff...read more
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Q2. What is difference between interface and abstract class?
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Interface defines only method signatures while abstract class can have method implementations.
• An interface can be implemented by multiple classes while a class can extend only one abstract class.

• An abstract class can have instance variables while an interface cannot.

• An abstract class can have constructors while an interface cannot.

• An abstract class can provide default implementations for some methods while an interface...read more
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Q3. What is difference between docker and kubernet?
Ans. 
Docker is a containerization platform while Kubernetes is a container orchestration tool.
• Docker is used to create, deploy, and run applications in containers.

• Kubernetes is used to manage and orchestrate multiple containers in a cluster.

• Docker provides a way to package and distribute applications in a portable manner.

• Kubernetes provides features like automatic scaling, load balancing, and self-healing.

• Docker is a lower-...read more
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Q4. What is event emitter in angular?
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Event emitter is a class in Angular that allows communication between components.
• Event emitter is used to emit custom events in Angular.

• It allows communication between parent and child components.

• It can be used to pass data from child to parent component.

• It is a part of the @angular/core package.

• Example: @Output() eventEmitter = new EventEmitter();
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Q5. What is view encapsulation in angular?
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View encapsulation is a feature in Angular that allows for the creation of isolated components.
• View encapsulation ensures that styles defined in a component do not affect other components.

• There are three types of view encapsulation: Emulated, Native, and None.

• Emulated is the default and uses CSS to emulate shadow DOM.

• Native uses the browser's native shadow DOM implementation.

• None does not provide any view encapsulation
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Q6. How to communicate with components in angular?
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Components in Angular can communicate with each other using @Input, @Output, and services.
• Use @Input to pass data from parent to child component

• Use @Output to emit events from child to parent component

• Use services to share data between components that are not directly related

• Use RxJS subjects to create a shared data stream between components
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