Siemens Energy Senior Engineer Mechanical Interview Questions and Answers

Q1. What is process gear oil replacement
Ans. 
Process gear oil replacement is the procedure of draining out old gear oil from a system and refilling it with fresh gear oil.
• Drain out old gear oil from the system

• Ensure proper disposal of the old gear oil

• Refill the system with fresh gear oil

• Follow manufacturer's guidelines for the type and amount of gear oil to be used
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Q2. What have you done major activity
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Q1. Related to previous job questions
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20 min - 20 questions

Q1. About virtual DOM and it's implementation
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Q2. Implementation of map, reduce, filter
Ans. 
Map, reduce, and filter are higher-order functions commonly used in functional programming to manipulate arrays.
• Map: Transforms each element in an array based on a provided function.

• Reduce: Reduces an array to a single value by applying a function to each element.

• Filter: Creates a new array with elements that pass a certain condition.
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Q3. Closures and their implementation
Ans. 
Closures are functions that have access to variables from their containing scope.
• Closures can access variables from their outer function even after the outer function has finished executing.

• Closures can be used to create private variables in JavaScript.

• Closures are commonly used in event handlers and callbacks.
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Q4. Redux sagas and their practical use cases
Ans. 
Redux sagas are middleware libraries for managing side effects in Redux applications.
• Redux sagas are used to handle asynchronous actions in Redux, such as API calls or timers.

• They are implemented as generator functions that can pause and resume execution.

• Redux sagas provide a more structured and testable approach to handling side effects compared to traditional Redux middleware like Thunk.

• Common use cases for redux sag...read more
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Q5. Basic javascript output questions
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Q1. Write a function to find the sum of the array using reduce.
Ans. 
Function to find sum of array using reduce
• Use the reduce method to iterate through the array and accumulate the sum

• Convert array elements to numbers before summing them up

• Handle edge cases like empty array or non-numeric elements

• Example: const array = ['1', '2', '3']; const sum = array.reduce((acc, curr) => acc + Number(curr), 0);
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Q2. About form validation techniques
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Q3. UseCallback and useMemo
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Q1. What do you know about Hitachi energy
Ans. 
Hitachi Energy is a global technology leader that provides innovative and sustainable energy solutions.
• Hitachi Energy offers a wide range of products and services for the energy sector, including grid integration, digital solutions, and consulting services.

• The company focuses on creating a more sustainable energy future through its advanced technologies and expertise.

• Hitachi Energy is known for its commitment to innova...read more
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Q2. Why do you want to join only Hitachi energy.
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Q1. Technical questions related to electrical engineering
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Q2. Domain related questions
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Q1. Asset management process
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Q2. Per MW cost with rational?
Ans. 
Per MW cost with rational refers to the cost of generating one megawatt of electricity with a logical and reasonable approach.
• Per MW cost with rational is calculated by taking into account all the expenses incurred in generating one megawatt of electricity.

• This includes the cost of fuel, maintenance, labor, and other operational expenses.

• The cost can vary depending on the type of power plant, fuel source, and location.

• ...read more
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Q1. Case study, operation excellence,
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Q1. Functional and Work Experience related.
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Q1. Salary and Location Negotiations
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