Product Engineer

90+ Product Engineer Interview Questions and Answers

Updated 19 Nov 2024

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Q1. Left View Of Binary Tree

Given a binary tree. Print the Left View of the Tree.

Example :
If the input tree is as depicted in the picture: 

alt text

The Left View of the tree will be: 2 35 2 
Input format :
Elements in t...read more
Q2. Reverse Words In A String

You are given a string of length N. You need to reverse the string word by word. There can be multiple spaces between two words and there can be leading or trailing spaces but in the ou...read more

Product Engineer Interview Questions and Answers for Freshers

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Q3. Arithmetic Expression Evaluation

You are given a string ‘expression’ consists of characters ‘+’, ‘-’, ‘*’, ‘/’, ‘(‘, ‘)’ and ‘0’ to ‘9’, that represents an Arithmetic Expression in Infix Notation. Your task is t...read more

Q4. Longest Common Subsequence

You have been given two Strings “STR1” and “STR2” of characters. Your task is to find the length of the longest common subsequence.

A String ‘a’ is a subsequence of a String ‘b’ if ‘a’...read more

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Q5. Find Duplicates In Array

You are given an array/list 'ARR' consisting of N integers, which contains elements only in the range 0 to N - 1. Some of the elements may be repeated in 'ARR'. Your task is to find all ...read more

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Q6. Maximum Subarray Sum

Given an array of numbers, find the maximum sum of any contiguous subarray of the array.

For example, given the array [34, -50, 42, 14, -5, 86], the maximum sum would be 137, since we would ...read more

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Q7. Covid Vaccination

We are suffering from the Second wave of Covid-19. The Government is trying to increase its vaccination drives. Ninja wants to help the Government to plan an effective method to help increase v...read more

Q8. Factorial of a Number

You are given an integer ‘N’. You have to print the value of Factorial of ‘N’. The Factorial of a number ‘N’ is defined as the product of all numbers from 1 to ‘N’.

For Example:
Consider if...read more

Product Engineer Jobs

PRODUCT ENGINEER I 3-7 years
TE Connectivity India Private Limited
4.2
Bangalore / Bengaluru
Product Engineer - STA 2-7 years
Siemens Limited
4.1
Bangalore / Bengaluru
S&C Global Network - AI -Product Engineering - Senior Manager 12-17 years
Accenture Solutions Pvt Ltd
3.9
Bangalore / Bengaluru
Q9. Technical Question

Which tech stack have you worked on ?


Q10. Mathematical puzzle: given 8 ball, 7 having same weight determine ball having different weight than others in 2 go.

Ans.

Find odd ball out of 8 balls in 2 weighings with 7 balls having same weight.

  • Divide balls into 3 groups of 3, 3, and 2 balls

  • Weigh 3 balls against 3 balls

  • If both weighings are equal, odd ball is in the group of 2 balls

  • If one weighing is heavier, odd ball is in the heavier group

  • Weigh 2 balls from the heavier group, and the odd ball will be identified

  • If both weighings are lighter, odd ball is in the lighter group

  • Weigh 2 balls from the lighter group, and the odd ball will be ident...read more

Q11. System Design Question

They give a problem statement and ask to create different APIs according to the requirements. Also create db tables for the same. The APIs might need to join two tables.

Q12. Data interpretation

The problem was focused on how you can make queries to find what the data is interpreting.
It was more of a discussion round to check how much you are good with the data

Q13. Technical Questions

Questions like
Why do you want to join a start up?
What career path are you aiming for?
Any interesting problem that you have solved before.

Q14. What is the meaning of telecom sources and what kind of CDR we get through these source?

Ans.

Telecom sources refer to the data sources used by telecommunication companies to collect Call Detail Records (CDRs) for billing and analysis purposes.

  • Telecom sources are used to collect CDRs for billing and analysis purposes

  • CDRs obtained from telecom sources include information such as call duration, call time, caller ID, and call location

  • Examples of telecom sources include mobile network operators, landline service providers, and VoIP service providers

Q15. What is the effect of adding Vanadium or Tungsten as an alloy element to Plain carbon steel??

Ans.

Adding Vanadium or Tungsten as alloy elements to Plain carbon steel improves its strength, hardness, and wear resistance.

  • Vanadium and Tungsten increase the hardenability of carbon steel.

  • They form carbides, which enhance the steel's strength and wear resistance.

  • Vanadium also helps in refining the grain structure of the steel.

  • Tungsten improves the high-temperature strength and toughness of the steel.

  • Both elements contribute to the overall improvement in the mechanical propertie...read more

Q16. File transfer, how to check Server health, How to check Core in Linux, How to connect one server to another Servers.

Ans.

Answering questions related to file transfer, server health check, core in Linux, and server connectivity.

  • For file transfer, use tools like SCP, SFTP, or Rsync.

  • To check server health, use monitoring tools like Nagios, Zabbix, or Prometheus.

  • To check core in Linux, use the command 'cat /proc/cpuinfo' or 'lscpu'.

  • To connect one server to another, use tools like SSH or VPN.

  • Ensure proper network configuration and security measures are in place.

  • Regularly update and maintain servers ...read more

Q17. DBMS Question

What are ACID properties.

Q18. What is tolerance? Difference between speed and velocity? Calculate sliding velocity?

Ans.

Tolerance is the allowable variation in a product's dimensions. Speed is scalar, velocity is vector. Sliding velocity is the velocity of a sliding object.

  • Tolerance is the range of acceptable variation in a product's dimensions

  • Speed is the rate at which an object moves, while velocity is the rate at which an object moves in a specific direction

  • Sliding velocity is the velocity of an object that is sliding on a surface

  • Sliding velocity can be calculated by multiplying the coeffic...read more

Q19. OOPS

Design a parking lot system.

Q20. DBMS Question

What is an Inner Join?

Q21. How would you ensure all faults are captured in the product you make

Ans.

To ensure all faults are captured in the product, a comprehensive testing process should be implemented.

  • Implement a rigorous testing strategy that covers all aspects of the product

  • Perform functional testing to ensure the product meets all requirements

  • Conduct regression testing to identify any new faults introduced during development

  • Utilize automated testing tools to increase efficiency and accuracy

  • Encourage feedback from users and stakeholders to identify potential faults

  • Impl...read more

Q22. Write a python code to read, display and find duplicates in a data set.

Ans.

Python code to read, display, and find duplicates in a data set.

  • Use the pandas library to read the data set into a DataFrame

  • Display the data set using the print() function or DataFrame.head() method

  • Find duplicates by using the DataFrame.duplicated() method

  • Filter the DataFrame to show only the duplicate rows

Q23. what is ambient temperature...... Room temperature

Ans.

Ambient temperature is the temperature of the surrounding environment.

  • It is the temperature of the air or surroundings in which an object is located.

  • It can vary depending on the location and time of day.

  • It is typically used as a reference point for temperature measurements.

  • Room temperature is a common example of ambient temperature, usually around 20-25°C.

Q24. Given a vector of Strings, can it form a circle by joining the ends with same characters

Ans.

Yes, a circle can be formed if all strings have the same starting and ending characters.

  • Check if all strings have the same starting and ending characters

  • Join the strings in a circular manner to form a circle

  • Example: ['abc', 'cde', 'efg'] can form a circle as 'abc' -> 'cde' -> 'efg' -> 'abc'

Q25. What is the different types of protocols used in communication system?

Ans.

Different types of protocols used in communication systems include TCP/IP, HTTP, FTP, SMTP, and SNMP.

  • TCP/IP (Transmission Control Protocol/Internet Protocol) - used for communication over the internet

  • HTTP (Hypertext Transfer Protocol) - used for transferring web pages

  • FTP (File Transfer Protocol) - used for transferring files between a client and server

  • SMTP (Simple Mail Transfer Protocol) - used for sending email messages

  • SNMP (Simple Network Management Protocol) - used for man...read more

Q26. Detail study of control loops & cascade controller.

Ans.

Control loops and cascade controllers are important components in process control systems.

  • Control loops are used to maintain a desired process variable by continuously adjusting the manipulated variable.

  • Cascade controllers are a type of control loop where the output of one controller is used as the setpoint for another controller.

  • Cascade control is commonly used in industries such as chemical, oil and gas, and power generation.

  • Cascade control can improve the response time and...read more

Q27. Create a server in node.js and implement certain functionalities.

Ans.

A server in node.js with implemented functionalities.

  • Use the 'http' module to create a server

  • Implement different routes and handle requests using 'express' framework

  • Use 'body-parser' middleware to parse request bodies

  • Implement CRUD operations for data manipulation

  • Handle errors and implement error handling middleware

Q28. Explain the fundamental concepts of object oriented programming.

Ans.

Object-oriented programming is a programming paradigm that organizes code into objects with properties and behaviors.

  • Encapsulation: bundling data and methods together in a single unit

  • Inheritance: creating new classes by inheriting properties and behaviors from existing classes

  • Polymorphism: using a single interface to represent different types of objects

  • Abstraction: simplifying complex systems by breaking them down into manageable parts

Q29. What is FMEA & how it is used in your industry?

Ans.

FMEA stands for Failure Mode and Effects Analysis. It is a systematic approach to identify and prevent potential failures in a product or process.

  • FMEA is used in various industries such as automotive, aerospace, and manufacturing.

  • It involves identifying potential failure modes, their causes, and the effects of those failures.

  • Risk priority numbers (RPN) are assigned to each failure mode to prioritize corrective actions.

  • FMEA helps in improving product quality, reducing costs, a...read more

Q30. Minimum number of operations to convert string s1 to s2

Ans.

Minimum number of operations to convert string s1 to s2 is the Levenshtein distance between the two strings.

  • Use dynamic programming to calculate the Levenshtein distance between the two strings.

  • The operations allowed are insertion, deletion, and substitution of a single character.

  • Example: s1 = 'kitten', s2 = 'sitting'. The minimum number of operations is 3 (substitute 'k' with 's', insert 'g', substitute 'e' with 'i').

Q31. How to keep track of the Parent Node in a Binary Tree

Ans.

Parent node can be tracked by storing a reference to the parent node in each node of the binary tree.

  • Store a reference to the parent node in each node of the binary tree

  • Update the parent reference when inserting or deleting nodes

  • Use this parent reference to navigate back to the parent node

Q32. What is your experience in optimization?

Ans.

I have experience in optimizing product design and manufacturing processes.

  • I have worked on reducing production costs by optimizing the manufacturing process.

  • I have used simulation software to optimize product design and improve performance.

  • I have implemented lean manufacturing principles to optimize production flow and reduce waste.

  • I have conducted experiments to optimize material selection and improve product durability.

  • I have collaborated with cross-functional teams to ide...read more

Q33. What is the process to calculate weight of material

Ans.

The weight of material can be calculated by multiplying the volume of the material by its density.

  • Calculate the volume of the material (length x width x height)

  • Determine the density of the material (usually in g/cm^3 or kg/m^3)

  • Multiply the volume by the density to get the weight of the material

  • Example: Weight = Volume x Density

Q34. How do you develop green sustainable product?

Ans.

Developing green sustainable products involves considering the environmental impact throughout the product lifecycle.

  • Conducting a life cycle assessment to identify areas for improvement

  • Using eco-friendly materials and manufacturing processes

  • Designing for durability and recyclability

  • Reducing energy consumption during use

  • Implementing end-of-life disposal strategies

  • Examples: solar-powered chargers, reusable water bottles, biodegradable packaging

Q35. Java Streams question to find the total number of employees that have salary greater than 50000

Ans.

Use Java Streams to find total employees with salary > 50000

  • Filter employees with salary > 50000 using stream.filter()

  • Count the number of employees using stream.count()

Q36. Is it okay to domain switch?

Ans.

Yes, it is generally okay to domain switch as a Product Engineer.

  • Domain switching can bring new perspectives and ideas to the role.

  • It allows for personal and professional growth.

  • Transferable skills can be valuable in different domains.

  • Adaptability and willingness to learn are important qualities.

  • Examples: A software engineer transitioning to product management or a mechanical engineer moving into software development.

Q37. Explain the method of garbage collection in java.

Ans.

Garbage collection in Java is an automatic process of reclaiming memory by deallocating objects that are no longer in use.

  • Garbage collection is performed by the JVM (Java Virtual Machine).

  • It frees up memory by identifying and removing objects that are no longer reachable.

  • The process involves three steps: marking, sweeping, and compacting.

  • Marking identifies objects that are still in use.

  • Sweeping frees up memory occupied by unreachable objects.

  • Compacting moves the remaining obj...read more

Q38. Draw any drawing in AutoCAD software according to customer.

Ans.

I would start by understanding the customer's requirements and specifications, and then use AutoCAD to create a detailed drawing that meets their needs.

  • Gather all necessary information from the customer regarding their requirements and specifications

  • Use AutoCAD software to create a detailed drawing that meets the customer's needs

  • Ensure accuracy and attention to detail in the drawing

  • Communicate with the customer throughout the process to ensure their satisfaction

Q39. Can static method be overriden/ overloaded?

Ans.

No, static methods cannot be overridden but can be overloaded.

  • Static methods belong to the class and not to the instance of the class.

  • Overriding is not possible as it requires inheritance and static methods cannot be inherited.

  • Overloading is possible as it allows multiple methods with the same name but different parameters.

  • Example: public static void method() and public static void method(int a)

Q40. What is the difference between ductile and malleable material

Ans.

Ductile materials can be drawn into wires, while malleable materials can be hammered or rolled into thin sheets.

  • Ductile materials can be drawn into wires without breaking.

  • Malleable materials can be hammered or rolled into thin sheets without breaking.

  • Ductile materials include metals like copper and aluminum.

  • Malleable materials include metals like gold and lead.

Q41. Regulations ECE and FMVSS and Design standards for Sheetmetal and plastic

Ans.

Regulations ECE and FMVSS and Design standards for Sheetmetal and plastic

  • ECE regulations are standards set by the United Nations Economic Commission for Europe for the safety and environmental performance of vehicles.

  • FMVSS refers to Federal Motor Vehicle Safety Standards, which are regulations set by the National Highway Traffic Safety Administration in the United States.

  • Design standards for sheet metal and plastic involve guidelines and specifications for the design and manu...read more

Q42. Variation of Number of Components in a Graph

Ans.

The number of components in a graph can vary based on the connections between nodes.

  • The number of components in a graph can be determined by counting the number of disconnected subgraphs.

  • For example, a graph with 3 disconnected subgraphs would have 3 components.

  • Adding or removing edges between nodes can change the number of components in a graph.

Q43. Design a search system which maximum features

Ans.

Design a search system with maximum features.

  • Identify the scope and requirements of the search system

  • Determine the search algorithm and ranking system

  • Include filters and sorting options

  • Implement autocomplete and suggestions

  • Incorporate natural language processing and machine learning

  • Ensure scalability and performance

  • Provide analytics and reporting features

Q44. How would you design a calculator with memory

Ans.

Designing a calculator with memory involves adding a storage feature for storing and recalling previous calculations.

  • Include a 'memory' button on the calculator for storing numbers or results

  • Allow users to store multiple values in memory and recall them as needed

  • Provide options for clearing memory or specific stored values

  • Display a visual indicator when memory is in use or has stored values

Q45. The various annotations used in Springboot @Entity, @RestController etc

Ans.

Annotations in Springboot like @Entity, @RestController are used for defining classes and endpoints respectively.

  • Annotations like @Entity are used to define JPA entities in Springboot.

  • Annotations like @RestController are used to define RESTful web services endpoints.

  • Annotations like @Autowired are used for dependency injection in Springboot.

Q46. What is TPM & it's practical impact?

Ans.

TPM stands for Total Productive Maintenance. It is a maintenance strategy that aims to maximize equipment effectiveness and minimize downtime.

  • TPM involves regular maintenance and inspection of equipment to prevent breakdowns

  • It emphasizes employee involvement and training to improve equipment performance

  • TPM can lead to increased productivity, reduced costs, and improved product quality

  • Examples of TPM techniques include autonomous maintenance, planned maintenance, and quality m...read more

Q47. How to handle employees in that shop floor

Ans.

Handling employees on the shop floor requires effective communication, clear expectations, and a positive work environment.

  • Establish clear expectations for behavior and performance

  • Provide regular feedback and recognition

  • Encourage open communication and active listening

  • Create a positive work environment with opportunities for growth and development

  • Address conflicts and issues promptly and professionally

Q48. Which material used for car manufacturing

Ans.

Various materials are used for car manufacturing including steel, aluminum, plastic, and carbon fiber.

  • Steel is commonly used for car bodies and frames due to its strength and durability.

  • Aluminum is used for parts that require lighter weight, such as wheels and engine blocks.

  • Plastic is used for interior components and some exterior parts.

  • Carbon fiber is used for high-performance vehicles and parts due to its strength and lightweight properties.

  • Other materials such as magnesium...read more

Q49. Update table 1 city from table 2 city value

Ans.

To update table 1 city from table 2 city value, use SQL UPDATE statement with JOIN clause.

  • Use UPDATE statement with JOIN clause to join both tables on a common column

  • Specify the column to be updated in table 1 and the corresponding column in table 2

  • Use WHERE clause to filter the rows to be updated

  • Example: UPDATE table1 JOIN table2 ON table1.id = table2.id SET table1.city = table2.city WHERE table1.id = 1

Q50. What is your grip on C?

Ans.

I have a strong grip on C programming language.

  • I have experience in writing efficient and optimized code in C.

  • I am familiar with data structures and algorithms in C.

  • I have worked on projects involving embedded systems and device drivers in C.

  • I have knowledge of memory management and pointers in C.

  • I have used C to develop applications in various domains such as networking, gaming, and system programming.

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