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HMEL's Guru Gobind Singh Petroleum Refinery Interview Questions and Answers

Updated 22 Feb 2025

HMEL's Guru Gobind Singh Petroleum Refinery Interview Experiences

Popular Designations

7 interviews found

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I was interviewed in Jan 2025.

Round 1 - Technical 

(5 Questions)

  • Q1. Types of RTD'S, THERMOCOUPLE, Control Valve, ON/OFF VALVE, PROXIMITY SENSOR, SWITCH, LOAD CELL,
  • Ans. 

    Types of RTD's, thermocouples, control valves, on/off valves, proximity sensors, switches, and load cells used in instrumentation.

    • RTD's (Resistance Temperature Detectors) - platinum, nickel, copper

    • Thermocouples - Type K, Type J, Type T

    • Control Valve - globe valve, butterfly valve, ball valve

    • On/Off Valve - solenoid valve, gate valve, diaphragm valve

    • Proximity Sensor - inductive sensor, capacitive sensor, ultrasonic sensor

    • ...

  • Answered by AI
  • Q2. Typey of Transmitter( LT,PT, FT ,DPT, RADAR, MASS FLOW),
  • Ans. 

    Transmitters used in instrumentation include LT, PT, FT, DPT, RADAR, and MASS FLOW.

    • LT - Level Transmitter measures the level of a substance in a tank or container.

    • PT - Pressure Transmitter measures pressure in a system.

    • FT - Flow Transmitter measures the flow rate of a substance in a pipe or channel.

    • DPT - Differential Pressure Transmitter measures the difference in pressure between two points.

    • RADAR - Radar Transmitter u...

  • Answered by AI
  • Q3. Types of SOV'S, Gauges , limit switch
  • Ans. 

    Types of SOV's, gauges, and limit switches used in instrumentation.

    • Types of SOV's: solenoid-operated valves, pneumatic valves, electrically-operated valves

    • Types of gauges: pressure gauges, temperature gauges, level gauges

    • Types of limit switches: mechanical limit switches, proximity limit switches, photoelectric limit switches

  • Answered by AI
  • Q4. AFR, BUSTER, Positioner,
  • Q5. Vibration Sensor, speed sensor
Round 2 - Group Discussion 

Diploma in Electronics Engg.

Round 3 - Group Discussion 

Diploma in Electronics Engg

Instrumentation Technician Interview Questions asked at other Companies

Q1. What kind of precautions need in Plant running time?
View answer (1)
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Planning basics

Interview Preparation Tips

Interview preparation tips for other job seekers - ok

Project Planner Interview Questions asked at other Companies

Q1. What is the most difficult thing to handle?
View answer (1)
HMEL's Guru Gobind Singh Petroleum Refinery Interview Questions and Answers for Freshers
illustration image
Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
More than 8 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed in Oct 2023. There were 3 interview rounds.

Round 1 - Aptitude Test 

Basic core questions from instrumentation

Round 2 - Group Discussion 

Our topic for the GD was electric vehicles in India

Round 3 - One-on-one 

(1 Question)

  • Q1. This was HR + Technical.

Graduate Engineer Interview Questions asked at other Companies

Q1. What is Finite Element Analysis? Explain using examples.
View answer (1)
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
6-8 weeks
Result
Selected Selected

I was interviewed before Feb 2024.

Round 1 - HR 

(1 Question)

  • Q1. What motivates you to want to join HMEL?
  • Ans. 

    I am motivated to join HMEL because of the company's strong reputation, growth opportunities, and commitment to excellence.

    • HMEL has a strong reputation in the industry, which motivates me to be a part of a successful organization.

    • I am excited about the growth opportunities that HMEL offers, and I am motivated to advance my career within the company.

    • The company's commitment to excellence in all aspects of its operations...

  • Answered by AI
Round 2 - Technical 

(1 Question)

  • Q1. Operations unit technical questions related to Heater Interlocks

Interview Preparation Tips

Interview preparation tips for other job seekers - The company experiences virtually no attrition in higher positions, making it challenging for individuals to advance within the hierarchy.

Deputy Manager Interview Questions asked at other Companies

Q1. 1.WHAT IS SPECIAL OF UR HOME TOWN 2.Who is Main compitetor with us and which products...3.what is main business in your area and its functions...4 Previous comoany achevements 5.Your strengts and weakness.
View answer (69)

HMEL's Guru Gobind Singh Petroleum Refinery interview questions for popular designations

 Safety Officer

 (1)

 Graduate Engineer

 (1)

 Instrumentation Technician

 (1)

 Production Engineer

 (1)

 Horticulturist

 (1)

 Project Planner

 (1)

 Deputy Manager

 (1)

I applied via Walk-in and was interviewed in May 2022. There were 4 interview rounds.

Round 1 - HR 

(1 Question)

  • Q1. Designation, work experience and qualifications.
Round 2 - Technical 

(1 Question)

  • Q1. Job specific questions like work experience, qualifications, before company working environment, site related work and policy.
Round 3 - Group Discussion 

Job related questions.

Round 4 - HR 

(1 Question)

  • Q1. Before company salary and facilities.

Interview Preparation Tips

Topics to prepare for HMEL's Guru Gobind Singh Petroleum Refinery Safety Officer interview:
  • Job specific questions
Interview preparation tips for other job seekers - No advice, every thing is very good.

Safety Officer Interview Questions asked at other Companies

Q1. If you don't have any safety equipment and documents how to complete the work ?
View answer (18)

I applied via Naukri.com

Round 1 - HR 

(1 Question)

  • Q1. General question about life ,family, Safety on site etc.

Interview Preparation Tips

Interview preparation tips for other job seekers - Job seeker update nearby location, Current affairs, Prepare for general apptitude question etc.

Horticulturist Interview Questions asked at other Companies

Q1. How to maintain garden,how to control pest and diseases
View answer (1)
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
4-6 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before May 2022. There were 4 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Aptitude Test 

Questions from core chemical engg.

Round 3 - Group Discussion 

Covid 19 pendemic and how India fought back

Round 4 - One-on-one 

(1 Question)

  • Q1. Technical interview

Production Engineer Interview Questions asked at other Companies

Q1. How to solve the problem in robot means how to detect fault?
View answer (9)

Interview questions from similar companies

I was interviewed before Jan 2021.

Round 1 - Face to Face 

(3 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

This was a typical DS/Algo where I was asked to solve two questions related to Binary Trees and write the pseudo code for both of them followed by some theoretical questions related to Operating Systems.

  • Q1. 

    K-th Largest Number in a BST

    Given a binary search tree (BST) consisting of integers and containing 'N' nodes, your task is to find and return the K-th largest element in this BST.

    If there is no K-th la...

  • Ans. 

    Find the K-th largest element in a BST.

    • Perform reverse in-order traversal of the BST to find the K-th largest element.

    • Keep track of the count of visited nodes to determine the K-th largest element.

    • Return -1 if there is no K-th largest element in the BST.

  • Answered by AI
  • Q2. 

    Is Height Balanced Binary Tree Problem Statement

    Determine if the given binary tree is height-balanced. A tree is considered height-balanced when:

    1. The left subtree is balanced.
    2. The right subtree is bala...
  • Ans. 

    Determine if a given binary tree is height-balanced by checking if left and right subtrees are balanced and their height difference is at most 1.

    • Check if the left subtree is balanced

    • Check if the right subtree is balanced

    • Calculate the height difference between the left and right subtrees

    • Return 'True' if all conditions are met, otherwise return 'False'

  • Answered by AI
  • Q3. Can you explain the concepts of Zombie Process and Orphan Process in operating systems?
  • Ans. 

    Zombie process is a terminated process that has completed execution but still has an entry in the process table. Orphan process is a process whose parent process has terminated.

    • Zombie process is created when a child process completes execution but its parent process has not yet read its exit status.

    • Zombie processes consume system resources and should be cleaned up by the parent process using wait() system call.

    • Orphan p...

  • Answered by AI
Round 2 - Face to Face 

(3 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

This was also a Data Structures and Algorithm round where I was asked to solve 3 medium to hard level problems along with their pseudo code within 60 minutes .

  • Q1. 

    Longest Substring Without Repeating Characters Problem Statement

    Given a string S of length L, determine the length of the longest substring that contains no repeating characters.

    Example:

    Input:
    "abac...
  • Ans. 

    Find the length of the longest substring without repeating characters in a given string.

    • Use a sliding window approach to keep track of the longest substring without repeating characters.

    • Use a hashmap to store the index of each character in the string.

    • Update the start index of the window when a repeating character is found.

    • Calculate the maximum length of the window as you iterate through the string.

    • Return the maximum le

  • Answered by AI
  • Q2. 

    Problem: Search In Rotated Sorted Array

    Given a sorted array that has been rotated clockwise by an unknown amount, you need to answer Q queries. Each query is represented by an integer Q[i], and you must ...

  • Ans. 

    Search for integers in a rotated sorted array efficiently.

    • Use binary search to efficiently search for integers in the rotated sorted array.

    • Handle the rotation of the array while performing binary search.

    • Return the index of the integer if found, else return -1.

  • Answered by AI
  • Q3. 

    Count Subarrays with Sum Divisible by K

    Given an array ARR and an integer K, your task is to count all subarrays whose sum is divisible by the given integer K.

    Input:

    The first line of input contains an...
  • Ans. 

    Count subarrays with sum divisible by K in an array.

    • Iterate through the array and keep track of the prefix sum modulo K.

    • Use a hashmap to store the frequency of each prefix sum modulo K.

    • For each prefix sum, increment the count by the frequency of (prefix sum - K) modulo K.

    • Handle the case when prefix sum itself is divisible by K.

    • Return the total count of subarrays with sum divisible by K.

  • Answered by AI
Round 3 - Face to Face 

(2 Questions)

Round duration - 50 Minutes
Round difficulty - Medium

In this round , I was asked to code a simple question related to BST . After that I was asked the internal implementation of a Hash Map where I was supposed to design a Hash Map using any of the Hashing Algorithms that I know . This was preety challenging for me but I got to learn so much from it.

  • Q1. 

    Ceil Value from BST Problem Statement

    Given a Binary Search Tree (BST) and an integer, write a function to return the ceil value of a particular key in the BST.

    The ceil of an integer is defined as the s...

  • Ans. 

    Ceil value of a key in a Binary Search Tree (BST) is found by returning the smallest integer greater than or equal to the given number.

    • Traverse the BST to find the closest value greater than or equal to the key.

    • Compare the key with the current node value and update the ceil value accordingly.

    • Recursively move to the left or right subtree based on the comparison.

    • Return the ceil value once the traversal is complete.

  • Answered by AI
  • Q2. 

    Design a Constant Time Data Structure

    Create a data structure that maintains mappings between keys and values, supporting the following operations in constant time:

    1. INSERT(key, value): Add or update t...
  • Ans. 

    Design a constant time data structure to maintain mappings between keys and values with various operations.

    • Use a hash table to achieve constant time complexity for INSERT, DELETE, SEARCH, and GET operations.

    • Keep track of the number of key-value pairs for GET_SIZE operation.

    • Check if the hash table is empty for IS_EMPTY operation.

    • Return true or false for SEARCH operation based on key existence.

    • Return the value associated...

  • Answered by AI

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAFlipkart interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 4 MonthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

I was interviewed before Jan 2021.

Round 1 - Coding Test 

(3 Questions)

Round duration - 90 Minutes
Round difficulty - Hard

I found the online coding round of Flipkart to be quite difficult based on the constraints of the problem and their time limits. I coded the first problem quite easily but on the second and the third problem , my code could only pass a few test cases and gave TLE for most of them. Both the questions required very efficient solution and the last 5 to 10 Test Cases carried more weight than the rest so I didn't get through this round.

  • Q1. 

    Print the Kth Digit

    Given three non-negative integers N, M, and K, compute the Kth digit from the right in the number obtained from N raised to the power M (i.e., N ^ M).

    Input:

    The first line contains ...
  • Ans. 

    The task is to find the Kth digit from the right in the number obtained from N raised to the power M.

    • Iterate through the digits of N^M from right to left

    • Keep track of the position of the current digit

    • Return the digit at position K from the right

  • Answered by AI
  • Q2. 

    The Skyline Problem

    Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette when viewed from a distance. Each building is ...

  • Ans. 

    Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette.

    • Iterate through the buildings and create a list of critical points (x, y) where the height changes.

    • Sort the critical points based on x-coordinate and process them to form the skyline.

    • Merge consecutive horizontal segments of equal height into one to ensure no duplicates.

    • Return the fin...

  • Answered by AI
  • Q3. 

    Longest Palindromic Substring Problem Statement

    You are provided with a string STR of length N. The goal is to identify the longest palindromic substring within this string. In cases where multiple palind...

  • Ans. 

    Identify the longest palindromic substring in a given string.

    • Iterate through the string and expand around each character to find palindromes

    • Keep track of the longest palindrome found

    • Return the longest palindrome with the smallest start index

  • Answered by AI

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAFlipkart interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 3 monthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewRejected

Skills evaluated in this interview

Interview Questionnaire 

1 Question

  • Q1. Off-campus interviews in Bangalore

Interview Preparation Tips

Round: Test
Experience: Only a few students will get shortlisted who do all the questions correctly.

Round: Other Interview
Experience: First 4 rounds on day 1 and this are just to shortlist for more rounds on some other day.
Tips: They will focus on almost all the concepts of computer science.You need to practice a lot and start it right now. Should be easy if you have prepared well enough. Use your holidays to start preparing for placements.

General Tips: Sooner you start, better your placement will be as lack of practice & last day study works only for exams but never for interviews. You'll get enough time to prepare for interviews once you get shortlisted. Focus on it even if you are placed already.
Skill Tips: They will focus on almost all the concepts of computer science.
Skills: C , Aptitude
College Name: NIT SURATHKAL
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HMEL's Guru Gobind Singh Petroleum Refinery Interview FAQs

How many rounds are there in HMEL's Guru Gobind Singh Petroleum Refinery interview?
HMEL's Guru Gobind Singh Petroleum Refinery interview process usually has 2-3 rounds. The most common rounds in the HMEL's Guru Gobind Singh Petroleum Refinery interview process are Group Discussion, HR and Technical.
What are the top questions asked in HMEL's Guru Gobind Singh Petroleum Refinery interview?

Some of the top questions asked at the HMEL's Guru Gobind Singh Petroleum Refinery interview -

  1. Types of RTD'S, THERMOCOUPLE, Control Valve, ON/OFF VALVE, PROXIMITY SENSOR, ...read more
  2. Typey of Transmitter( LT,PT, FT ,DPT, RADAR, MASS FLO...read more
  3. Types of SOV'S, Gauges , limit swi...read more

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HMEL's Guru Gobind Singh Petroleum Refinery Interview Process

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HMEL's Guru Gobind Singh Petroleum Refinery Reviews and Ratings

based on 19 reviews

4.5/5

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4.3

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4.4

Work-life balance

4.4

Salary

4.4

Job security

4.5

Company culture

3.8

Promotions

4.4

Work satisfaction

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