Knowledge Booster: NAIR Edition (30 Apr 2026)
Welcome to today's NAIR Knowledge Booster! We've handpicked 10 essential questions from our database to help you sharpen your skills. Dive in and test your knowledge!
Q1. Increase in number of loaded wagons received at interchange point affects WTR as?
- A) Decrease
- B) Increase
- C) Neutral
- D) None of the given options
Correct Answer: Decrease
Explanation: When receipts (R) increase, the mathematical result for Turn Round (T) decreases, signifying better efficiency.
Q2. Which control is responsible for arranging supply of wagons against pending registration?
- A) C & W Control
- B) Traffic Control
- C) Traction power Control
- D) Commercial Control
Correct Answer: Traffic Control
Explanation: The Traffic Control organization manages the logistical distribution and supply of wagons based on registration demands[cite: 1454, 1468].
Q3. Every year 'Hindi Diwas' is celebrated on which date?
- A) 14-Oct
- B) 16-Oct
- C) 14-Sep
- D) 16-Sep
Correct Answer: 14-Sep
Explanation: Hindi Diwas is observed annually on September 14 to mark the day Hindi was adopted as the official language.
Q4. Within how many days after the date of accident, DAR action must be taken?
- A) D+30
- B) D+60
- C) D+90
- D) D+120
Correct Answer: D+90
Explanation: Standard safety protocols require that Disciplinary and Appeal Rules (DAR) actions be finalized within 90 days of an accident.
Q5. Particular of stock of detonator is mentioned in part of fog signal register."
- A) 1st
- B) 2nd
- C) 3rd
- D) 4th
Correct Answer: 2nd
Explanation: Detonator inventory and stock levels are recorded in Part II of the station fog register. [cite: 1308, 1317]
Q6. Smell of burning grease is the symptom of?
- A) Seizure of roller bearing
- B) Brake binding
- C) Flat tyre
- D) None of these
Correct Answer: Seizure of roller bearing
Explanation: The smell of burning grease is a critical warning sign that a roller bearing has failed and is overheating, which can lead to a derailment[cite: 4540, 4542, 4564].
Q7. Sand Hump is an extended portion of rail in sand with increasing gradient of
- A) 1 in 60
- B) 1 in 80
- C) 1 in 100
- D) None of these
Correct Answer: 1 in 60
Explanation: A sand hump is a safety device with a steep 1 in 60 rising gradient designed to stop runaway wagons or trains[cite: 4309, 4310, 4329].
Q8. In emergencies and under special restrictions in each case what may be used in lieu of a tail board?
- A) A Red Flag
- B) A Green Flag
- C) Either a Red Flag or a Green Flag
- D) Neither a Red Flag nor a Green Flag
Correct Answer: A Red Flag
Explanation: If a standard tail board is unavailable, a red flag is the authorized emergency substitute to signal the end of the train[cite: 1956, 1971].
Q9. The running duty at a stretch for the running staff should not ordinarily exceed?
- A) 6 hours
- B) 7 hours
- C) 9 hours
- D) 8 hours
Correct Answer: 9 hours
Explanation: Standard railway regulations limit the continuous running duty of crew members to 9 hours under normal circumstances.
Q10. During 2022-23 Indian Railway transported how many million tonnes of freight?
- A) 1418.1
- B) 1298.5
- C) 1509.1
- D) 1360.5
Correct Answer: 1509.1
Explanation: Indian Railways achieved a milestone by transporting 1,509.1 million tonnes of freight during 2022-23[cite: 2493, 2508].
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