Combined Bank Assistant Maintenance Engineer Exam 24 January 2026 — Question Solution | সমন্বিত ব্যাংক (ব্যাংকার্স সিলেকশন কমিটি) সহকারী রক্ষণাবেক্ষণ প্রকৌশলী নিয়োগ পরীক্ষা ২০২৬ — প্রশ্ন সমাধান
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About this exam paper · প্রশ্নপত্র পরিচিতি
The Combined Bank Assistant Maintenance Engineer exam was held on 24 January 2026. The paper had 16 written questions. The subjects asked most were Cloud & Emerging Tech (3), Mathematics (2) and Web Technology (2). This page lists every question, with 2 answered and explained; the rest of the answers open with a free ARBS Academy account, where the paper can also be practised as a timed test.
সমন্বিত ব্যাংক (ব্যাংকার্স সিলেকশন কমিটি) সহকারী রক্ষণাবেক্ষণ প্রকৌশলী নিয়োগ পরীক্ষার (২০২৬) এই প্রশ্নপত্রে ১৬টি প্রশ্ন ছিল, বেশিরভাগ ক্লাউড ও উদীয়মান প্রযুক্তি ও গণিত থেকে। এখানে ২টি প্রশ্নের ব্যাখ্যাসহ উত্তর দেওয়া আছে; বাকিগুলো ফ্রি অ্যাকাউন্টে খোলে।
- Organisation
- Combined Bank
- Post
- Assistant Maintenance Engineer
- Exam date
- 24 January 2026
- Questions
- 16 (0 MCQ, 16 written)
- Exam guide
- Bank IT jobs · ব্যাংকের আইটি চাকরি
- Cloud & Emerging Tech · ক্লাউড ও উদীয়মান প্রযুক্তি 3
- Mathematics · গণিত 2
- Web Technology · ওয়েব টেকনোলজি 2
- Bangla to English Translation · বাংলা থেকে ইংরেজি অনুবাদ 1
- Computer Architecture · কম্পিউটার আর্কিটেকচার 1
- Cyber Security · সাইবার নিরাপত্তা 1
- Database · ডেটাবেজ 1
- Digital Logic · ডিজিটাল লজিক 1
- English to Bangla Translation · ইংরেজি থেকে বাংলা অনুবাদ 1
- English Writing · ইংরেজি লিখন 1
- Networking · নেটওয়ার্কিং 1
- Operating Systems · অপারেটিং সিস্টেম 1
1.i. Why do modern processor designs favor multistage pipeline approach over single cycle implementation? Explain with appropriate reasoning.
ii. A system has a very fast CPU but slow main memory, explain how memory hierarchy helps reduce the performance gap between CPU and memory.
2.i. Explain packet switching. A packet passes through 4 routers with each router introducing 2 ms processing delay. Transmission delay per link is 5 ms. Calculate total end-to-end delay (ignore propagation).
ii. Differentiate between IPv4 and IPv6. Given the IP address 192.168.10.0/24, calculate. Number of subnets if borrowed bits = 3 and hosts per subnet.
- i). Why is "Atomicity" specifically critical for an Inter-Bank Fund Transfer?
ii) A bank's ATM network experiences an average of 4 hours of downtime every 30 days due to server maintenance and network glitches. Calculate the System Availability percentage for the month. If the bank processes an average of 500 transactions per hour with an average fee of Taka 0.50 per transaction, calculate the total revenue loss during this downtime. (10)
iii. What are the four necessary conditions for a deadlock to occur? Briefly explain "Circular Wait."(10)
- i. Differentiate between Logical Address and Physical Address in context of Operating System. (5)
ii. What is the main disadvantage of a fuse compared to a Circuit Breaker? (5)
iii. You need to protect a small heater rated at 2.4 kW connected to a 240 V single-phase supply. What is the minimum current rating of the fuse you should use? (10)
5.i. In web technology what do the following status code categories represent? Give some specific example for each.
i. 2xx
ii. 4xx
iii. 5xx
ii. What are HTTP Cookies? How can cookies be a security risk?
Sign up free to see the model answers to written questions 1–5 · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন
- Simplify the following boolean expression using 4 variable K-map
F(A, B,C,D)=m(0,3,5,7,8,10,11,12,13,14,15).
Model answer
Answer: F(A, B, C, D) = Σm(0, 3, 5, 7, 8, 10, 11, 12, 13, 14, 15) simplifies to
F = B′C′D′ + BD + CD + AD′
Step 1: Fill the K-map
Rows are AB and columns are CD, both in Gray-code order (00, 01, 11, 10), so adjacent cells differ in one bit. The cell number is the minterm index (A = MSB).
| AB \ CD | 00 | 01 | 11 | 10 |
|---|---|---|---|---|
| 00 | 1 (m0) | 0 (m1) | 1 (m3) | 0 (m2) |
| 01 | 0 (m4) | 1 (m5) | 1 (m7) | 0 (m6) |
| 11 | 1 (m12) | 1 (m13) | 1 (m15) | 1 (m14) |
| 10 | 1 (m8) | 0 (m9) | 1 (m11) | 1 (m10) |
Step 2: Form the groups (largest possible, powers of 2)
| Group | Cells | What stays constant | Term | Essential? |
|---|---|---|---|---|
| G1: pair (top and bottom rows wrap) | m0, m8 | B = 0, C = 0, D = 0 | B′C′D′ | Yes: only group that can cover m0 |
| G2: quad (column CD = 11) | m3, m7, m15, m11 | C = 1, D = 1 | CD | Yes: only cover of m3 |
| G3: quad (middle square) | m5, m7, m13, m15 | B = 1, D = 1 | BD | Yes: only cover of m5 |
| G4: quad (four cells in rows 11 and 10, columns 00 and 10, wrapping left–right) | m12, m14, m8, m10 | A = 1, D = 0 | AD′ | Covers m10, m12, m14 together |
Why these groups:
- m0's neighbours m1, m2 and m4 are 0, so m0 can pair only with m8 → B′C′D′.
- m3's neighbours m1 and m2 are 0, so m3 must join the CD column.
- m5's neighbours m1 and m4 are 0, so m5 must join the BD square.
- After G1–G3, only m10, m12 and m14 remain. One quad, AD′, covers all three. Using AB (m12–m15) and AC (m10, m11, m14, m15) instead would need two terms, so AD′ gives the minimum.
Step 3: Write the minimal SOP
F = B′C′D′ + BD + CD + AD′ (4 product terms, 9 literals)
Step 4: Check
| Minterm | ABCD | Covered by |
|---|---|---|
| 0 | 0000 | B′C′D′ |
| 3 | 0011 | CD |
| 5 | 0101 | BD |
| 7 | 0111 | BD, CD |
| 8 | 1000 | B′C′D′, AD′ |
| 10 | 1010 | AD′ |
| 11 | 1011 | CD |
| 12 | 1100 | AD′ |
| 13 | 1101 | BD |
| 14 | 1110 | AD′ |
| 15 | 1111 | BD, CD |
A 0-cell check: m1 = 0001 (B = 0, C = 0, D = 1) makes every term 0: B′C′D′ = 0 (D = 1), BD = 0, CD = 0, AD′ = 0. So F = 0, as required. All 16 rows agree with the given function.
Exam tip: start with the 1s that have only one possible group (here m0, m3 and m5) to find the essential prime implicants, then cover what is left with the fewest, largest groups; remember the corner and edge wrap-around.
- An increasing number of organizations in industry and business sectors adopt" cloud computing. List 5 key enabling technologies of cloud computing. (5)
- You have been hired as a Cloud Data Engineer to design a big data analytes pipeline for an e-commerce company. The company needs to:
Ingest millions of real-time web server logs,
Store and manage petabytes of raw and structured data,
Process data for batch and stream analytics,
Provide near real-time product recommendations,
Run machine learning models at scale,
- From the following Hadoop ecosystem components:
MapReduce, HDFS, YARN, HBase, ZooKeeper, Pig, Hive, Mahout, Chukwa, Cassandra, Avro, Oozie, Flume, Sqoop
Identify five components from the list that you would use to design this pipeline. Justify the role of each chosen component in this scenario, focusing on its functionality. (10)
Scenario (from question 8): You have been hired as a Cloud Data Engineer to design a big data analytes pipeline for an e-commerce company. The company needs to:
Ingest millions of real-time web server logs,
Store and manage petabytes of raw and structured data,
Process data for batch and stream analytics,
Provide near real-time product recommendations,
Run machine learning models at scale,
- Explain the role of CSS Media Queries and the Viewport Meta Tag in creating responsive applications. What is the "Mobile-First" approach? (10)
- A bank's internal audit reveals that several employees share a single "Superuser" password to update customer accounts. Furthermore, the bank's policy requires daily backups, but the audit shows backups are only being done weekly. (10)
i. Identify the Policy violation regarding account access. the backup schedule.
ii. Explain the Compliance failure regarding the backup schedule.
- A machine produces defective items at a rate of 25% IT items are selected, what is the probability that at least one item is defective? (10)
Sign up free to see the model answers to written questions 7–12 · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন
- At a bank's annual maintenance engineering conference, there are 10 engineers a room. If every engineer shakes hands with every other engineer exactly unce what is the total number of handshakes that take place? (10)
Model answer
Given: 10 engineers in a room; every engineer shakes hands exactly once with every other engineer.
To find: the total number of handshakes.
Answer: 45 handshakes.
A handshake needs two different engineers, and the order does not matter (A shaking B's hand is the same handshake as B shaking A's). So the number of handshakes is the number of ways to choose 2 engineers out of 10.
Method 1: Combinations
ⁿCᵣ = n! ÷ [r! (n − r)!]
¹⁰C₂ = 10! ÷ (2! × 8!) = (10 × 9) ÷ (2 × 1) = 90 ÷ 2 = 45
Method 2: Counting from each engineer
Each engineer shakes hands with the other 9, giving 10 × 9 = 90. But every handshake has been counted twice (once by each person), so
Handshakes = (10 × 9) ÷ 2 = 45
General formula for n people: n(n − 1) ÷ 2
Method 3: Adding one by one
- Engineer 1 shakes hands with 9 new people
- Engineer 2 with 8 new people (already shook with engineer 1)
- Engineer 3 with 7 new people, and so on, until engineer 9 with 1 and engineer 10 with 0.
Total = 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 45
Graph view
If each engineer is a vertex and each handshake an edge, the room forms the complete graph K₁₀, which has n(n − 1)/2 = 45 edges.
graph LR
E1(("E1")) --- E2(("E2"))
E1 --- E3(("E3"))
E1 --- E4(("E4"))
E2 --- E3
E2 --- E4
E3 --- E4
(Shown for 4 engineers: 4 × 3 ÷ 2 = 6 handshakes; the same rule gives 45 for 10.)
| Engineers (n) | 2 | 3 | 4 | 5 | 10 | 20 |
|---|---|---|---|---|---|---|
| Handshakes n(n − 1)/2 | 1 | 3 | 6 | 10 | 45 | 190 |
Check: each of the 10 engineers takes part in 9 handshakes, so total participations = 10 × 9 = 90 = 2 × 45, since each handshake has two participants.
Final answer: 45 handshakes.
Exam tip: "everyone with everyone, once" means ⁿC₂ = n(n − 1)/2; forgetting to divide by 2 (answer 90) is the usual mistake.
- Translate the following sentences into correct and meaningful English. (10)
a) কঠোর নীতিমালার কারণে ক্ষুদ্র উদ্যোক্তারা প্রয়োজনীয় ঋণ সুবিধা থেকে বঞ্চিত হচ্ছে।
b) গ্রাহকদের আস্থা অর্জনের জন্য স্বচ্ছতা এবং জবাবদিহিতা অপরিহার্য।
c) দুর্নীতি দেশের উন্নয়নের অন্তরায়।
d) সকাল থেকে গুঁড়ি গুঁড়ি বৃষ্টি হচ্ছে।
e) উপদেশ দেওয়ার চেয়ে পালন করা কঠিন।
- Translate the following sentences into correct and meaningful Bangla. (10)
a) Empty vessels sound much.
b) Customers are encouraged to use online banking services to reduce transaction time and operational costs.
c) The bank has decided to waive the service charge.
d) The project is still in its nascent stage
e) True greatness lies not in power, but in humility and moral integrity.
- "Data is the new compute in today's Al era." Critically analyze this statement in the context of modern Al applications. Your answer should demonstrate clarity of thought, coherence, and relevance to the topic.
Sign up free to see the model answers to written questions 14–16 · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন
Explanations © ARBS Academy
Questions about this paper · সাধারণ প্রশ্ন
- How many questions were in the Combined Bank Assistant Maintenance Engineer exam (2026)?
- 16 written questions.
- Which subjects were asked most in the Combined Bank Assistant Maintenance Engineer exam (2026)?
- Cloud & Emerging Tech (3), Mathematics (2) and Web Technology (2), out of 16 questions.
- When was the Combined Bank Assistant Maintenance Engineer exam held?
- On 24 January 2026.
- Where can I find the Combined Bank Assistant Maintenance Engineer exam (2026) question solution?
- On this page: 2 of the 16 questions are shown with worked answers. The rest of the answers open with a free ARBS Academy account, where the paper can also be practised as a timed test.
Question text is from the public recruitment exam; answers and explanations are written by ARBS Academy. All past papers