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

2 hour, medium to hard questions

Q1. Finding sum of 3x3 submatrix
Ans. 
To find the sum of a 3x3 submatrix within a larger matrix, iterate through the elements and calculate the sum.
• Iterate through the rows and columns of the larger matrix to find all possible 3x3 submatrices.

• Calculate the sum of each 3x3 submatrix by adding up all the elements within it.

• Keep track of the maximum sum found so far as you iterate through all submatrices.

• Return the maximum sum found as the final result.
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30 apti question easy and reasoning and you can do it

You just need to be confident for
it

There is nothing much to say it's just a normal aptitude test

Q1. Array related questions
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Q2. String related questions.
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General aptitude test

They give general topics

Q1. Basic questions introduction
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Q2. Are you okey with bond!?
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Analytical questions, quantative apptitude and verbal and programming pseudocode

Innovation vs invention

Really easy just need to manage your time well.

Q1. Which was a really motivating moment of your life tell me about that moment.
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Q2. If you had the opportunity to go back in time and meet a historical figure who would it be?
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Q1. Tell me the difference between Drop, Delete and Truncate in DBMS.
Ans. 
Drop deletes the table structure and data, Delete removes specific rows, Truncate removes all rows but keeps the table structure.
• Drop removes the table structure along with all the data in the table.

• Delete removes specific rows based on a condition using the WHERE clause.

• Truncate removes all rows from a table but keeps the table structure intact.

• Example: DROP TABLE table_name; DELETE FROM table_name WHERE condition; TR
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All basics quantitive, reasoning etc

Q1. Database Management system . Anamolies regarding joinig
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Q2. Basic HR questions
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Basic aptitude questions on basic topics

Q1. Difference between c++ and Java
Ans. 
C++ is a statically typed language with manual memory management, while Java is a dynamically typed language with automatic memory management.
• C++ is compiled directly to machine code, while Java is compiled to bytecode and runs on a virtual machine (JVM)

• C++ supports multiple inheritance, while Java supports only single inheritance

• C++ has pointers, while Java does not have pointers but has references

• C++ allows for opera...read more
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Q2. Code for prime numbers
Ans. 
Code to find prime numbers in a given range
• Iterate through numbers in the given range

• Check if each number is divisible by any number other than 1 and itself

• If not divisible, then it is a prime number
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