Propel Industries Engineer Trainee Interview Questions, Process, and Tips

Moderate level difficulties

Q1. Introduction of yourself
Ans. 
I am a recent graduate with a degree in Mechanical Engineering, passionate about problem-solving and eager to learn and grow in the field.
• Graduated with a Bachelor's degree in Mechanical Engineering

• Strong problem-solving skills

• Eager to learn and grow in the engineering field
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Q2. Proficiency in 3D modeling
Ans. 
Proficient in 3D modeling using software like AutoCAD, SolidWorks, and Blender.
• Experience in creating detailed 3D models for various projects

• Ability to interpret and work with technical drawings and specifications

• Familiarity with different 3D modeling software and their capabilities

• Strong understanding of geometric shapes and dimensions

• Portfolio showcasing 3D modeling projects completed
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Basic aptitude and numerical questions

Q1. Explain your final year project
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Q2. What are your areas of interest?
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Q1. College project
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Q1. Types of cooling towers
Ans. 
Cooling towers are used to remove heat from a process by evaporating water.
• Natural draft cooling towers

• Mechanical draft cooling towers

• Crossflow cooling towers

• Counterflow cooling towers
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Q2. There types of cooling towers 1. Natural draught cooling tower 2. Forced draught cooling tower 3. Induced draught cooling tower
Ans. 
There are three types of cooling towers: natural draught, forced draught, and induced draught.
• Natural draught cooling towers use the natural convection of air to cool water.

• Forced draught cooling towers use fans to force air through the tower.

• Induced draught cooling towers use fans to draw air through the tower.

• The choice of cooling tower type depends on factors such as the size of the plant, the cooling requirements, ...read more
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30 minute 30 questions including verbal and quantitative aptitude

Q1. Basic level technical questions related to mechanical engineering
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Q1. General level questions regarding topics in the resume
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Q1. What is the location you are willing to join
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It was only an aptitude test with no coding questions, although there were some pseudo codes and mostly consisted of aptitude

Q1. Was asked mostly questions on SQL and then the projects and some pseudocode
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After the resume screening, the shortlisted candidates were sent a link to the test which was scheduled a few days later. The test had 2 sections - Technical and Aptitude MCQs, and a Coding section.

The Coding test had 2 easy-medium level questions. They were fairly easy to complete, and I successfully passed all test-cases.

Q1. Tell me about any of the projects on your resume.
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Q2. Explain the working of Bubble Sort (I had to pen down the pseudo-code, but others were asked to write the code as well).
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Q3. Explain the working of Insertion Sort.
Ans. 
Insertion Sort is a simple sorting algorithm that builds the final sorted array one item at a time.
• Start from the second element and compare it with the previous elements to find its correct position in the sorted array.

• Repeat this process for all elements in the array.

• Example: Given array of strings ['banana', 'apple', 'orange'], after insertion sort it becomes ['apple', 'banana', 'orange'].
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Q4. How would you find the maximum and second-maximum numbers in an array? (Pseudo-code)
Ans. 
Use a loop to iterate through the array and keep track of the maximum and second-maximum numbers.
• Initialize two variables to store the maximum and second-maximum numbers.

• Iterate through the array and update the variables accordingly.

• Handle edge cases like when the array has less than two elements.
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Q5. Write the query to execute a left-join on two tables - I was shown a database with a few tables defined.
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Q6. What do you understand by the phrase 'pass-by-value'?
Ans. 
Pass-by-value is a method of passing arguments to a function where the actual value of the argument is copied to a new variable.
• In pass-by-value, a copy of the actual value of the argument is passed to the function.

• Any changes made to the parameter inside the function do not affect the original value outside the function.

• Primitive data types like integers, floats, and characters are typically passed by value.

• Example: i...read more
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Q7. If you're given two CSV files, containing 2 columns each, how would you merge the two files using Python?
Ans. 
To merge two CSV files with 2 columns each in Python, use the pandas library.
• Import the pandas library

• Read the two CSV files into pandas DataFrames

• Merge the DataFrames using a common column as the key

• Save the merged DataFrame to a new CSV file
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Q8. Puzzle - A drawer contains 10 pairs each of red and blue socks. What is the minimum number of socks that should be picked to obtain at least 1 rightly colored pair?
Ans. 3, since there are only 2 colors of socks.
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Q9. Problem Solving - How would you reduce the vehicle congestion at a junction?
Ans. 
To reduce vehicle congestion at a junction, implement traffic signal optimization, encourage public transportation, and create dedicated lanes for buses and bicycles.
• Implement traffic signal optimization to improve traffic flow and reduce wait times.

• Encourage the use of public transportation by providing incentives such as discounted fares or improved services.

• Create dedicated lanes for buses and bicycles to reduce the...read more
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Q1. What is your short-term plan in life?
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Q2. Reasons, if any, for the change in grades from high-school to university. (I went from a 95 aggregate in high-school, to a 85 aggregate in university)
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Q3. What is your preferred location and how would you adjust if you did not receive your preferred location?
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