Electric Power Research Institute Interview Questions and Answers

Diesel Generator: A Reliable Power Source
A diesel generator is a self-contained power generating unit that combines a diesel engine with an electric generator (often an alternator). It's a versatile and widely used source of electricity, particularly in situations where a reliable power supply is crucial.
How Diesel Generators Work
* Diesel Engine: The diesel engine, fueled by diesel fuel, acts as the prime mover. It converts the chemical energy of the fuel into mechanical energy through combustion.
* Electric Generator: The mechanical energy from the engine is transferred to the generator, which converts it into electrical energy. This electrical energy can then be used to power various appliances and equipment.
Applications of Diesel Generators
* Backup Power: Diesel generators are commonly used as backup power sources for homes, businesses, hospitals, and critical infrastructure during power outages.
* Remote Locations: In areas with limited or no access to the grid, diesel generators provide a reliable source of electricity for various applications.
* Construction Sites: Diesel generators power tools and equipment on construction sites, ensuring work can continue even in remote locations.
* Off-Grid Living: Individuals living off the grid often rely on diesel generators for their electricity needs.
* Data Centers: Diesel generators provide backup power to ensure the continuous operation of critical data centers.
Advantages of Diesel Generators
* Reliability: Diesel engines are known for their durability and reliability, making them suitable for demanding applications.
* Fuel Efficiency: Modern diesel engines offer excellent fuel efficiency, reducing operating costs.
* Wide Power Range: Diesel generators are available in a wide range of sizes and power capacities, catering to various needs.
* Easy Maintenance: Diesel generators are relatively easy to maintain and service.
Disadvantages of Diesel Generators
* Noise: Diesel generators can be noisy, which may be a concern in certain settings.

Q1. Transformer & protection
Add your answer
Q2. Breaker & protection
Add your answer
Q3. Motor panel Feeder & protection
Add your answer

Q1. Motor & Motor protection
Add your answer
Q2. All types panel & protection
Add your answer

Q1. API Gateway implementation
Ans. 
API Gateway implementation is a centralized service that routes, manages, and secures API calls.
• API Gateway acts as a single entry point for all API calls

• It can handle authentication, rate limiting, caching, and request/response transformations

• Examples include AWS API Gateway, Apigee, Kong
Answered by AI
Add your answer
Q2. Circuit breaker implementation
Ans. 
Circuit breaker is a design pattern used to prevent system overload by temporarily stopping requests to a failing service.
• Circuit breaker monitors requests to a service and opens when the service fails repeatedly.

• It helps prevent cascading failures and allows the system to gracefully degrade.

• Once the circuit breaker is open, it can periodically check if the service has recovered before allowing requests again.
Answered by AI
Add your answer
Q3. What is deadlock? How to avoid it?
Ans. 
Deadlock is a situation in which two or more processes are unable to proceed because each is waiting for the other to release a resource.
• Avoid circular wait by ensuring processes request resources in the same order.

• Prevent hold and wait by requiring processes to request all needed resources at once.

• Implement a timeout mechanism to break potential deadlocks.

• Use resource allocation graphs to detect and prevent deadlocks.

• ...read more
Answered by AI
Add your answer
Q4. Explain equals() method
Ans. 
The equals() method is used to compare the contents of two objects for equality.
• The equals() method is a method of the Object class in Java.

• It is used to compare the contents of two objects for equality.

• The default implementation of equals() in the Object class compares memory addresses, so it is often overridden in custom classes to compare content.

• Example: String class overrides equals() method to compare the content
Answered by AI
Add your answer
Q5. How mongodb was integrated in your application?
Ans. 
MongoDB was integrated in the application by using the official Java driver and configuring connection settings.
• Used the official MongoDB Java driver to interact with the database

• Configured connection settings such as host, port, database name, and authentication credentials

• Implemented CRUD operations using MongoDB Java driver methods

• Utilized MongoDB aggregation framework for complex queries
Answered by AI
Add your answer
Q6. What is hibernate?
Ans. 
Hibernate is an open-source Java framework that simplifies the development of database interactions in Java applications.
• Hibernate is an Object-Relational Mapping (ORM) tool that maps Java objects to database tables.

• It provides a way to perform database operations using Java objects instead of writing SQL queries.

• Hibernate handles the mapping of Java classes to database tables and vice versa, as well as the generation ...read more
Answered by AI
Add your answer
Q7. Runnable vs Callable interface
Ans. 
Runnable is a functional interface with a single run() method, while Callable is a functional interface with a single call() method.
• Runnable is used for tasks that do not return a result, while Callable is used for tasks that return a result.

• Callable can throw checked exceptions, while Runnable cannot.

• Callable returns a Future object, which can be used to retrieve the result of the computation.

• Example: Runnable - execu...read more
Answered by AI
Add your answer
Q8. Which type of data is returned by Callable interface?
Ans. 
The Callable interface in Java returns a Future object.
• Callable interface returns a Future object which represents the result of a computation that may not be available yet.

• The Future object can be used to retrieve the result of the computation, check if it is done, or cancel the computation.

• Example: Callable<Integer> task = () -> { return 42; }
Answered by AI
Add your answer
Q9. HashMap internal working
Add your answer
Q10. Concurrent HashMap internal working
Add your answer
Q11. How to monitor health of your application?
Ans. 
Monitor application health using metrics, logs, alerts, and performance monitoring tools.
• Use monitoring tools like Prometheus, Grafana, or New Relic to track key metrics such as CPU usage, memory usage, response times, and error rates.

• Implement logging to record important events and errors in your application. Use tools like ELK stack (Elasticsearch, Logstash, Kibana) for log analysis.

• Set up alerts to notify you of any...read more
Answered by AI
Add your answer
Q12. How to call an API in a Microservice architecture?
Ans. 
To call an API in a Microservice architecture, use HTTP requests or messaging protocols like gRPC.
• Use HTTP requests to communicate between microservices

• Implement RESTful APIs for easy integration

• Leverage messaging protocols like gRPC for efficient communication

• Consider using service discovery mechanisms for dynamic API calls
Answered by AI
Add your answer
Q13. Explain Profiles
Ans. 
Profiles in Java are configurations that define the capabilities of a Java platform.
• Profiles allow developers to target specific types of devices or applications.

• They help in reducing the size of the Java runtime environment by including only the necessary APIs.

• Examples include Java SE Embedded Profile for embedded devices and Java SE Compact Profile for resource-constrained environments.
Answered by AI
Add your answer
Q14. What is OpenFeign, and how is it used in microservices architecture?
Ans. 
OpenFeign is a declarative web service client used to simplify the process of making HTTP requests in microservices architecture.
• OpenFeign allows developers to define RESTful web services as interfaces and automatically generate the necessary implementation code.

• It integrates seamlessly with Spring Cloud and other microservices frameworks to facilitate communication between services.

• OpenFeign supports features like loa...read more
Answered by AI
Add your answer
Q15. What is the implementation process for service registry and discovery?
Ans. 
Service registry and discovery involves registering services and allowing clients to discover and connect to them.
• Implement a service registry where services can register themselves with metadata

• Use a service discovery mechanism for clients to find and connect to services

• Implement health checks to ensure services are available and healthy

• Use a load balancer to distribute traffic among multiple instances of a service
Answered by AI
Add your answer
Q16. What are Spring boot actuators?
Ans. 
Spring Boot Actuators are built-in tools that provide insight into the running application.
• Actuators expose various endpoints to monitor and manage the application.

• They can be used to check health, metrics, environment details, and more.

• Examples include /actuator/health, /actuator/metrics, and /actuator/env.
Answered by AI
Add your answer
Q17. Synchronous vs Asynchronous communication
Ans. 
Synchronous communication is blocking, while asynchronous communication is non-blocking.
• Synchronous communication waits for a response before continuing, while asynchronous communication does not wait.

• Examples of synchronous communication include traditional function calls, while examples of asynchronous communication include callbacks and promises.

• Synchronous communication can lead to performance issues if there are d...read more
Answered by AI
Add your answer
Q18. Explain Synchronized keyword
Ans. 
Synchronized keyword is used in Java to control access to shared resources by multiple threads.
• Synchronized keyword can be applied to methods or code blocks to ensure only one thread can access the synchronized code at a time.

• It prevents race conditions and ensures thread safety by creating a lock on the object or class.

• Example: synchronized void myMethod() { // synchronized code block }
Answered by AI
Add your answer
Q19. What are the consequences of excessively using synchronized blocks and methods in Java?
Ans. 
Excessive use of synchronized blocks and methods in Java can lead to performance issues and potential deadlocks.
• Decreased performance due to increased contention for locks

• Potential deadlocks if multiple threads are waiting for each other to release locks

• Increased complexity and difficulty in debugging and maintaining code

• Use synchronized sparingly and consider alternatives like ConcurrentHashMap or Lock interface
Answered by AI
Add your answer
Q20. How can you determine the number of threads needed for your application?
Ans. 
The number of threads needed for an application can be determined based on factors like the type of tasks, hardware resources, and performance requirements.
• Consider the type of tasks your application needs to perform - CPU-bound tasks may benefit from more threads, while I/O-bound tasks may not.

• Take into account the hardware resources available - more threads may be beneficial on a multi-core processor compared to a si...read more
Answered by AI
Add your answer
Q21. Explain Executor framework
Ans. 
Executor framework is a framework in Java that provides a way to manage and execute tasks asynchronously.
• Allows for managing thread execution in a more efficient way

• Provides a way to decouple task submission from task execution

• Supports various types of executors like ThreadPoolExecutor and ScheduledExecutorService

• Helps in handling tasks concurrently and asynchronously
Answered by AI
Add your answer
Q22. Explain BlockingQueue
Ans. 
BlockingQueue is an interface in Java that represents a queue which supports operations that wait for the queue to become non-empty when retrieving an element and wait for space to become available in the queue when adding an element.
• BlockingQueue is part of the java.util.concurrent package.

• It is used for implementing producer-consumer scenarios where multiple threads are involved.

• Methods like put() and take() are used...read more
Answered by AI
Add your answer

Q1. Why did you leave your previous 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
Answered by AI
Add your answer
Q2. Other basic questions asked regarding the relevant skills and technologies I have worked with.
Add your answer

This is a basic 10th-grade level aptitude test; if you have prepared for the CAT or XAT exams, it should be quite easy for you.

Current topics related to your field of study or the job for which you have applied; I was campus placed, and therefore, this round was part of the selection process. For lateral entries, a direct interview occurs after your resume has been shortlisted.

Q1. Tell me something about yourself?
Add your answer
Q2. What are the material topics under the umbrella for Hindalco? Can you propose a method to solve 3 of the top material topics?
Add your answer
Q3. A case study will be presented on the go to you. You'll have to answer a couple of questions based on your understanding of the issue. The case will be presented in a descriptive form from one of the panel...read more
Add your answer
Q4. Some more technical questions related to your field of study/ Job description
Add your answer

Q1. Document verification
Add your answer
Q2. Personal details
Add your answer
Q3. Group discussion
Add your answer
Q4. Hr department discussion
Add your answer
Q5. Discussion salary
Add your answer

Q1. I am krishna murthy p
Add your answer
Q2. I am Instrested bmm ispat company one of the best company
Add your answer
Q3. One opportunity given sir
Add your answer
Q4. Electrical engineering
Add your answer
Q5. I am name krishna murthy p i am stady diploma electrical engineering I am experience totally 8 years
Add your answer

Bachelor of Commerce degree with a GPA of 6.79 and an accompanying resume.

Q1. Location send Hyderabad komplly
Add your answer
Q2. Hardwark honest project
Add your answer
Q3. First introducedy
Add your answer
Q4. Salarypackge and times
Add your answer
Q5. Respect to office staff
Add your answer

Q1. Brief about your education, career, previous projects handled, and role & responsibility in past organisations?
Add your answer
Q2. Current roles & responsibilities and value addition done by you and your team?
Add your answer
Q3. Process flow for planning throughout project life-cycle?
Add your answer
Q4. Critical/concerning areas to be monitored?
Add your answer
Q5. Productivity and permissible material wastage, process to prepare material reconciliation?
Add your answer
Q6. Understanding about claim and type of claim raised/supported to raise in past experience?
Add your answer
Q7. Experience of technical aspects and planning assessment required at tendering stage, capabilities to prepare tender submittals and proving insights to management on same?
Add your answer
Q8. Necessity of providing PMO support to management?
Add your answer
Q9. Understanding about role & responsibility of regional planning manager?
Add your answer
Q10. MIS and type of reports prepared in past and their significance for Top managemennt?
Add your answer

It was a technicaL + aptitude test with 60 minutes duration.

Q1. Basic questions regarding the projects that i have done.
Add your answer
Q2. They asked me about my favourite subjects and then they asked some basic questions regarding those subjects.
Add your answer

Q1. HR round in TCE is not an interview round rather it is a video assessment wherein we were given with two HR questions and we have to record a video answering the questions. maximum duration of the video sh...read more
Add your answer

Q1. How much experience you have into froud management?
Add your answer
Q2. H uch money you can take from parents?
Add your answer

Q1. State Head sis equal to Business Development Executive.
Add your answer
Q2. State Head is not aware about the product.
Add your answer