Voltech HR Recruiter 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
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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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Q1. Electrical regarding
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Q2. Testing of HT LT panel
Ans. 
Testing of HT LT panel involves various procedures to ensure its functionality and safety.
• Testing of HT LT panel includes visual inspection for any physical damage or loose connections.

• Functional testing is performed to check the operation of various components such as circuit breakers, relays, meters, etc.

• Insulation resistance testing is conducted to verify the insulation integrity of the panel.

• High voltage testing is...read more
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Q1. Types of MCB ??
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Miniature Circuit Breaker (MCB) is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions.
• Types of MCB include single pole MCB, double pole MCB, triple pole MCB, and four pole MCB

• MCBs can also be classified based on their breaking capacity, such as B, C, D, and K types

• Some examples of MCB manufacturers are Schneider Electric, Siemens, ABB, and Legrand
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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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