Dhaka WASA Assistant Maintenance Engineer (Network) July 2025 – Written (BUET) question & solution

Questions from the Dhaka WASA Assistant Maintenance Engineer (Network) recruitment exam, July 2025 – Written (BUET), shared by the candidates who sat it. The paper: 15 written questions. So far 15 written questions have been shared. Topics include English, Computer Architecture, Operating System, Mathematics and Digital Logic.

Written (15)

  1. Find the Norton equivalent circuit for a DC power supply that has a 30 V terminal voltage when delivering 400mA and a 28V terminal voltage…
  2. Design a three-input X-OR gate with the output function f = w1 ⊕ w2 ⊕ w3 using 2-to-1 multiplexers.
  3. A system uses 16 bit logical address and a page size of 1 KB. (i) How many pages are in logical address space? (ii) How many bits are used…
  4. Write a Linux command to count the total number of characters and words from the first 10 lines of a file named "wasacustomers.txt".
  5. Given the network 245.248.128.0/20, divide the address space among three departments as follows: (a) Manager: half of the address space…
  6. What will be the output of following program? #include <stdio.h> int main() { int i=-1, j=-1, k=0, l=2, m; m= i++ && j++ && k++ || l++…
  7. From an Employee table. Write SQL statement statement according to the following question: (a) Find out the employees who join the same…
  8. What is SQL injection? How can you prevent SQL injection attacks?
  9. A two-element series circuit has an average power of 940W and a power factor of 0.707 (leading). Determine the circuit elements if the…
  10. I have no prejudice ___ any religion.
  11. I can't cope ____ the situation.
  12. I have no appetite ___ the food.
  13. The teacher congratulated the students____ their success.
  14. লাবিব, সামি, রনি এর মধ্যে 5:4:2 অনুপাতে টাকা ভাগ করে দেওয়া হলো। যদি রনি 180 টাকা ভাগ পায় তাহলে, লাবিব কত টাকা পাবে?
  15. একটি দ্রব্য 5% ক্ষতিতে বিক্রয় করলে বিক্রয়মূল্য হয় 2375 টাকা। 6% লাভে বিক্রয় করতে হলে বিক্রয়মূল্য কত টাকা হবে?