TCS Production Support Analyst Interview Questions and Answers

Q1. What is internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple key-value pairs hash to the same index, they are stored in a linked list at that index.

• To retrieve a value...read more
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Q2. What is difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified while iterating.

• ConcurrentHashMap allows concurrent modifications without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurrently.

• Concurren...read more
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Q3. Can we override main method in java
Ans. 
No, main method in Java cannot be overridden.
• Main method is a static method of a class and cannot be overridden.

• Subclasses can have their own main method, but it will not be considered as the entry point of the program.

• Example: public class SubClass extends MainClass { public static void main(String[] args) { // This is not the entry point of the program }}
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Q4. Write the command to find the hidden files in unix
Ans. 
Use the 'ls' command with the '-a' flag to find hidden files in Unix.
• Use the command 'ls -a' to list all files, including hidden files.

• Hidden files in Unix start with a dot (.) before the file name.

• Example: 'ls -a' will display all files, including hidden files.
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Q5. Write a command to replace a string in unix
Ans. 
Use the sed command to replace a string in Unix
• Use the following syntax: sed 's/original_string/new_string/g' filename

• The 's' flag stands for substitute, 'g' flag stands for global (replace all occurrences)

• Example: sed 's/hello/goodbye/g' file.txt
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24/7 production environment

Q1. What is the difference between PL SQL AND SQL?
Ans. 
PL/SQL is a procedural language extension to SQL used for writing complex queries and programs.
• SQL is used for querying and manipulating data in a database

• PL/SQL is used for writing complex queries and programs

• PL/SQL is a procedural language that extends SQL with programming constructs like loops and conditional statements

• PL/SQL is used to create stored procedures, functions, and triggers in Oracle databases
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Q2. About programming
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Q3. Write a query using below data to find out last string from emp table?
Ans. 
Query to find last string from emp table
• Use the ORDER BY clause with DESC keyword to sort the table in descending order

• Use the LIMIT keyword to limit the result to 1 row

• Assuming the last string refers to the last row in the table
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Q4. Write s query to find maximum salary from EMP?
Ans. 
Query to find maximum salary from EMP
• Use the MAX() function to find the maximum salary

• Specify the column name for salary in the SELECT statement

• Specify the table name and column name for salary in the FROM clause
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Hydraulic systems and hydraulic machines.

Q1. What is the difference between BS4 and BS6 emissions standards?
Ans. 
BS6 emissions standards are more stringent than BS4, with lower limits on emissions of pollutants like nitrogen oxides and particulate matter.
• BS6 standards have stricter limits on emissions of pollutants like nitrogen oxides (NOx) and particulate matter (PM) compared to BS4.

• BS6 compliant vehicles are required to have advanced emission control technologies like selective catalytic reduction (SCR) and diesel particulate ...read more
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Q2. What is the difference between an electric motor and an electric generator?
Ans. 
An electric motor converts electrical energy into mechanical energy to produce motion, while an electric generator converts mechanical energy into electrical energy.
• Electric motor converts electrical energy into mechanical energy

• Electric generator converts mechanical energy into electrical energy

• Electric motor is used in appliances like fans, washing machines

• Electric generator is used in power plants to generate electr
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Q3. Difference between four stroke and two stroke engine
Ans. 
Four stroke engines have separate intake, compression, power, and exhaust strokes, while two stroke engines combine intake and compression in one stroke and power and exhaust in another.
• Four stroke engines have a dedicated stroke for each of the four processes: intake, compression, power, and exhaust

• Two stroke engines combine intake and compression in one stroke and power and exhaust in another

• Four stroke engines are m...read more
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It was Easy to medium . overall good

It was Medium to tough level

Q1. What is fifo lifo
Ans. 
FIFO (First In, First Out) and LIFO (Last In, First Out) are inventory management methods.
• FIFO: Items that are added first are the first to be removed. Like a queue.

• LIFO: Items that are added last are the first to be removed. Like a stack.
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Q2. Whole data structure concepts
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Q1. What do you want to change in this country if you get a chance
Ans. 
I would focus on improving access to quality education for all citizens.
• Implementing policies to ensure equal opportunities for education

• Investing in infrastructure and resources for schools in underserved areas

• Providing scholarships and financial aid for students from low-income families

• Promoting vocational training programs to address skills gaps in the workforce
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Q2. I don't remember
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Q1. WHAT IS sage FRONT END PROGRAMMING LANGUAGE
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Q2. WHAT ARE THE REGULAR COMPLAINS USERS GET ON SAGE
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Q1. About interview is production engineer
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Q2. About interview is production supervisor
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Q1. Please ask technical level question?
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Q2. Application support engineer question?
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Q1. Self introduction
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Q2. Work experience
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Q3. Which department are u working
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Q4. Timings and salary
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Q1. Name and experience and quality and checking etc
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Q2. How can handle ur problem and team work
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Q3. Times and salary
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