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NTPC Placement Papers 2024

Overview

This page collects NTPC placement papers from 2024 with previous-year questions, solutions, and the 2024 exam pattern. It is useful when you want real drive history: what the OA looked like, which question types repeated, and how solutions were approached. Work through the papers below to build speed and accuracy, then compare against newer 2025 material so your prep matches both established NTPC patterns and the latest shifts.

NTPC written examination 2024 pattern

Section Questions Time Difficulty
Technical 40-50 60 min Medium-Hard
Aptitude 20-25 30 min Medium

NTPC Placement Papers 2024 - actual questions & solutions

This section contains practice questions styled on NTPC placement papers 2024 (previous-year pattern), with worked solutions. Use them as timed sectional drills - from student reports drives vary by college and role, so treat this as a high-signal practice bank, not an official paper dump.

Question 1

Q1: A and B together finish a job in 12 days. B alone takes 18 days. How many days does A alone take?

Solution:

Together rate = 1/12. B’s rate = 1/18.

A’s rate = 1/12 − 1/18 = (18−12)/(12×18) = 6/216. Days for A alone = 216/6 = 36 days.

Answer: 36 days

Question 2

Q2: A number is increased by 10% and then decreased by 10%. Find the net percentage change.

Solution:

Let original = 100. After +10% → 110. After −10% → 110 − 11 = 99.

Net change = 100 − 99 = 1. Net % = 1% decrease (always a loss of (10/10)² %).

Answer: 1% decrease

Question 3

Q3: Average of 6 numbers is 18. If one number 12 is replaced by 24, what is the new average?

Solution:

Old sum = 6 × 18 = 108. New sum = 108 − 12 + 24 = 120. New average = 120/6 = 20.

Answer: 20

Question 4

Q4: The ratio of ages of A and B is 3:5. After 10 years, the ratio becomes 5:7. Find A’s present age.

Solution:

Let ages be 3x and 5x.

(3x + 10)/(5x + 10) = 5/7 7(3x + 10) = 5(5x + 10) 21x + 70 = 25x + 50 x = 5 A’s age = 3×5 = 15 years.

Answer: 15 years

Question 5

Q5: Which number does not belong: 10, 25, 45, 54, 60, 75, 80?

Solution:

Pattern: All divisible by 5 except 54

Odd one out = 54.

Answer: 54

Question 6

Q6: Pointing to a photo, Ravi said, ‘He is the son of my grandfather’s only son.’ How is the person related to Ravi?

Solution:

Grandfather’s only son = Ravi’s father. Son of Ravi’s father = Ravi himself (or his brother).

In standard puzzle framing with one son implied for the speaker context: the person is Ravi’s brother (or Ravi). Most campus keys take Brother.

Answer: Brother

Question 7

Q7: Which normal form removes transitive dependency?

Solution:

1NF: atomic values. 2NF: no partial dependency. 3NF: no transitive dependency.

Answer: 3NF

Question 8

Q8: Time complexity of binary search on a sorted array of n elements is?

Solution:

Each step halves the search space → O(log n).

Answer: O(log n)

Question 9: reverse a string

Show solution

Problem Statement: Given a string, return it reversed.

Example:

Input: "placement"
Output: "tnemecalp"

Solution (Java):

public String reverse(String s) {
    return new StringBuilder(s).reverse().toString();
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 10: two sum

Show solution

Problem Statement: Given an array of integers and a target, return indices of two numbers that add up to target.

Example:

Input: nums = [2, 7, 11, 15], target = 9
Output: [0, 1]

Solution (Java):

public int[] twoSum(int[] nums, int target) {
    Map<Integer, Integer> map = new HashMap<>();
    for (int i = 0; i < nums.length; i++) {
        int need = target - nums[i];
        if (map.containsKey(need)) return new int[]{map.get(need), i};
        map.put(nums[i], i);
    }
    return new int[]{};
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 11: maximum subarray sum

Show solution

Problem Statement: Find the contiguous subarray with the largest sum.

Example:

Input: [-2, 1, -3, 4, -1, 2, 1, -5, 4]
Output: 6  // [4, -1, 2, 1]

Solution (Java):

public int maxSubArray(int[] nums) {
    int best = nums[0], cur = nums[0];
    for (int i = 1; i < nums.length; i++) {
        cur = Math.max(nums[i], cur + nums[i]);
        best = Math.max(best, cur);
    }
    return best;
}

Time Complexity: O(n)
Space Complexity: O(1)

Key insights from 2024 NTPC written examination

  1. Technical Section is Critical: Must perform well in power generation and engineering fundamentals
  2. Aptitude Section: Important for overall performance
  3. Time Management: 40-50 technical questions in 60 min + 20-25 aptitude in 30 min
  4. Success Rate: Only 10-15% cleared written exam and advanced to interviews
  5. Platform: NTPC written examination
  6. Focus Areas: Power generation, thermal power plants, engineering fundamentals

NTPC 2024 interview experiences

Based on candidate experiences from 2024 NTPC interviews:

2024 Interview Process:

  1. Written Examination (90 minutes): Technical (40-50) + Aptitude (20-25)
  2. Technical Interview (60-90 minutes): Power generation concepts, thermal power plants, engineering fundamentals, problem-solving
  3. HR Interview (30-45 minutes): Behavioral questions, company fit, motivation, power generation passion

Common 2024 Interview Topics:

  • Technical: Power generation, thermal power plants, engineering fundamentals
  • Aptitude: Quantitative reasoning, logical reasoning
  • Behavioral: Problem-solving approach, power generation passion, teamwork, motivation

Success Tips:

  • Strong technical performance is essential - master power generation and engineering fundamentals
  • Understand thermal power plant systems and power generation processes
  • Practice problem-solving in power generation domain
  • Prepare behavioral examples demonstrating power generation passion
  • Understand NTPC’s projects and power generation programs
  • Practice explaining complex technical concepts clearly

For detailed interview experiences, visit NTPC Interview Experience page.

Preparation tips for NTPC 2024 pattern

  1. Master Technical Fundamentals: Focus on power generation, thermal power plants - study thoroughly
  2. Engineering Fundamentals: Strong understanding of engineering fundamentals relevant to power generation
  3. Practice Previous Year Papers: Solve NTPC written exam papers from 2020-2024 to understand patterns
  4. Time Management: Practice completing 40-50 technical questions in 60 minutes
  5. Aptitude Practice: Practice quantitative and logical reasoning
  6. Power Generation: Deep understanding of thermal power plants, power generation processes
  7. Problem-Solving: Practice solving complex technical problems in power generation domain
  8. Behavioral Preparation: Prepare examples using STAR format - power generation passion, problem-solving
  9. Mock Tests: Take timed practice tests to improve speed and accuracy
  10. NTPC Projects: Stay updated with NTPC’s projects and power generation programs

Comments & Suggestions

2025 papers

NTPC Technical Questions

Interview experience

Preparation guide

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