Voltech Engineer Trainee Interview Questions and Answers

Gate level questions

Recently all topics covered about the technology

Q1. Self introduction
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Q2. Family background
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Q1. Beee all questions
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Q2. Specific designation related questions
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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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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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It was average yet time crunch was there

Q1. Fairly average, easy even at sime points
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Q2. Where do you internshiped tell me about yourself
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Q1. Technical questions regarding transformers
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Q2. Tell me about stand alone systems
Ans. 
Stand alone systems are independent systems that operate without the need for external connections or dependencies.
• Stand alone systems do not require internet connectivity to function

• They are self-sufficient and can operate independently

• Examples include standalone computers, calculators, and offline software applications
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Q1. Will you be able to give your time
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Basically first they ask you 30 MCQ questions on your technical part then you will have to face gamified aptitude there lots of sections are there like verbal, reasoning, soduko, memory game, puzzle, psychometric etc.

Q1. What do you learn during your vacation training
Ans. 
During my vacation training, I learned practical skills, gained industry knowledge, improved communication and teamwork abilities, and developed problem-solving skills.
• Practical skills related to the specific field of engineering

• Industry knowledge about current trends, technologies, and best practices

• Improved communication and teamwork abilities through working with colleagues and supervisors

• Developed problem-solving s...read more
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Q2. Types of DC machine
Ans. 
DC machines are classified into two main types: DC generator and DC motor.
• DC Generator: Converts mechanical energy into electrical energy

• DC Motor: Converts electrical energy into mechanical energy

• Examples: Separately excited DC generator, series-wound DC motor, shunt-wound DC motor
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Q1. What are your hobbies and why
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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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