Keystone Interview Questions and Answers

Q1. What is the critical situation of fgd
Ans. 
The critical situation of FGD refers to the failure of Flue Gas Desulfurization systems, leading to increased emissions of sulfur dioxide.
• Failure of FGD systems can result in non-compliance with environmental regulations

• Increased emissions of sulfur dioxide can lead to air pollution and health risks

• Critical situation may require immediate maintenance or shutdown of the system to prevent further damage

• Examples: Equipmen...read more
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Q1. Coding and self evaluation
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Leetcode medium question

3 board member group round for coding and system design

Q1. Job role and salary discussion
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15 minutes on paper coding questions is given

Q1. Java related question
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Q2. Jdk information on java
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Q3. Java interface in actual coding
Ans. 
Java interfaces are used to define a contract for classes to implement, allowing for polymorphism and loose coupling.
• Interfaces in Java are used to define abstract methods that must be implemented by classes that implement the interface.

• Interfaces can also contain constants, default methods, and static methods.

• Example: interface Animal { void eat(); } class Dog implements Animal { public void eat() { System.out.println
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Q4. Object oriented programming langauge
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Q1. Hr round on java
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Q1. Reasons for job change and other general HR questions
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Q2. Compensation related questions and shift flexibility related questions were asked
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Q1. Situational-based and scenario-based questions were asked, KPI and KRA and team handling questions were asked,. Over all interview as per the CV.
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Q2. Data Management Questions, Project Management Questions were asked
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Basic computer knowledge, English grammar

Q1. Tell me about yourself Common question
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Q2. Tell me about yourself
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Q3. Common topic we say about that topic
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Q4. Testing english knowledge
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Q1. Just observe how we work
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Q1. What is bias variance tradeoff in machine learning
Ans. 
Bias-variance tradeoff is the balance between underfitting and overfitting in machine learning models.
• Bias refers to error from erroneous assumptions in the learning algorithm, leading to underfitting.

• Variance refers to error from sensitivity to small fluctuations in the training set, leading to overfitting.

• The tradeoff involves finding the right level of model complexity to minimize both bias and variance.

• Regularizati...read more
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Q2. Explain your project
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Q3. Write a SQL code to find 2nd highest salary
Ans. 
SQL code to find 2nd highest salary
• Use the MAX() function to find the highest salary

• Use the WHERE clause to exclude the highest salary

• Order the salaries in descending order and limit the result to 1
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General knowledge kind of tests

Q1. Government regulations and policies
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Q2. What would you do as a supervisor inchrge of ensuring government compliance is conplied at all times versus your company demanding you to favour it?
Ans. 
As a supervisor, I would prioritize government compliance over company demands.
• Educate and communicate the importance of government compliance to the company

• Establish clear policies and procedures for government compliance

• Monitor and audit compliance regularly

• Address any non-compliance issues promptly and take appropriate actions

• Document all compliance efforts and maintain records

• Seek legal advice if necessary to ensur...read more
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Q1. What is the core business of an effluent treatment plant?
Ans. 
The core business of an effluent treatment plant is to treat and manage wastewater from industrial processes.
• Effluent treatment plants are responsible for removing pollutants and contaminants from wastewater before it is discharged into the environment.

• They use various treatment processes such as physical, chemical, and biological methods to treat the wastewater.

• Effluent treatment plants ensure compliance with environm...read more
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Q2. What is the relationship between minerals and acid?
Ans. 
Minerals can react with acid to form salts and release hydrogen gas.
• Minerals can undergo chemical reactions with acids.

• The reaction between minerals and acid can result in the formation of salts.

• Hydrogen gas may be released during the reaction.

• The reaction rate can vary depending on the type of mineral and acid involved.

• Examples of minerals that react with acid include limestone (calcium carbonate) and dolomite (calciu
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Q3. What do u understand by the term ACID MINE DRAINAGE (AMD)?
Ans. 
ACID MINE DRAINAGE (AMD) refers to the acidic water that is formed when sulfide minerals in rocks are exposed to air and water.
• ACID MINE DRAINAGE (AMD) is a major environmental problem in mining areas.

• It occurs when sulfide minerals, such as pyrite, are exposed to air and water, leading to the formation of sulfuric acid.

• The acidic water can contaminate surface water, groundwater, and soil, causing harm to aquatic life ...read more
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Q4. How do you deal with such a challenge?
Ans. 
I deal with challenges by analyzing the situation, developing a plan, and effectively communicating with team members.
• Analyze the challenge to understand its root cause

• Develop a plan of action to address the challenge

• Communicate the plan to team members and assign tasks

• Monitor progress and provide guidance and support

• Regularly evaluate the effectiveness of the plan and make adjustments as needed
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Q5. What would you do if your superior asks you to work under presure and do short cuts in order to beat time on the tasks?
Ans. 
I would prioritize quality and safety over beating time and follow the established processes.
• I would communicate with my superior to understand the reasons behind the request and express my concerns about compromising quality and safety.

• I would emphasize the importance of following established processes and the potential risks of taking shortcuts.

• I would propose alternative solutions to improve efficiency without compr...read more
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Q6. What would you do to your subordinates potrays very bad attitudes towards work?
Ans. 
As a Process Supervisor, I would address subordinates with bad attitudes by implementing a combination of communication, motivation, and disciplinary actions.
• Hold a team meeting to discuss the importance of positive attitudes and the impact it has on productivity and team morale.

• Provide clear expectations and goals to each team member, emphasizing the importance of their role in achieving overall success.

• Offer incentiv...read more
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Behavioural and safety pinciples.and i worn the interviwers blessings.

Q1. Self introduction
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Q2. What is your previous company? What is your review? What about your work team why you quit the job?
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Q3. Salary expectations
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Q1. Salary expectations
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