Showing 381–390 of 419 questions
Q.381
Easy
Technical Knowledge (NTPC)
If a train travels 450 km in 6 hours, what is its average speed?
A
65 km/h
B
70 km/h
C
75 km/h
D
80 km/h
Correct Answer:
C. 75 km/h
Explanation:
Average speed = Total distance / Total time = 450 km / 6 hours = 75 km/h
Q.382
Medium
Technical Knowledge (NTPC)
What is the composition of steel rails used in Indian Railways?
A
Iron and Carbon only
B
Iron, Carbon, Manganese, and Silicon
C
Aluminum and Steel
D
Copper and Iron alloy
Correct Answer:
B. Iron, Carbon, Manganese, and Silicon
Explanation:
Modern rail steel contains Iron (primary), Carbon (0.6-0.8%), Manganese (0.7-1.0%), and Silicon to provide strength and durability.
Q.383
Medium
Technical Knowledge (NTPC)
Which device is used to detect broken rails in Indian Railways?
A
Radar detector
B
Ultrasonic testing device
C
Thermal camera
D
Speed gun
Correct Answer:
B. Ultrasonic testing device
Explanation:
Ultrasonic testing devices are used to detect cracks and breaks in rails without damaging them.
Q.384
Easy
Technical Knowledge (NTPC)
What is the role of a guard in a freight train?
A
To collect tickets
B
To monitor wagon conditions and train movement
C
To drive the locomotive
D
To maintain passenger comfort
Correct Answer:
B. To monitor wagon conditions and train movement
Explanation:
A freight train guard (or brake van attendant) monitors wagon conditions, coupling, load security, and assists in train operations.
Q.385
Easy
Technical Knowledge (NTPC)
What does the term 'gradient' mean in railway engineering?
A
The color of the track
B
The slope or inclination of the track
C
The age of the rail
D
The width of the track
Correct Answer:
B. The slope or inclination of the track
Explanation:
Gradient refers to the slope or angle of incline/decline of the railway track, expressed as a percentage or ratio.
Q.386
Medium
Technical Knowledge (NTPC)
If a train covers 540 km and takes 9 hours for the journey, and another train covers the same distance in 6 hours, what is the difference in their speeds?
A
30 km/h
B
45 km/h
C
60 km/h
D
90 km/h
Correct Answer:
A. 30 km/h
Explanation:
Speed of first train = 540/9 = 60 km/h; Speed of second train = 540/6 = 90 km/h; Difference = 90 - 60 = 30 km/h
Q.387
Medium
Technical Knowledge (NTPC)
What is the primary purpose of a pantograph in electric trains?
A
To provide lighting
B
To collect electricity from overhead wires
C
To control train speed
D
To apply brakes
Correct Answer:
B. To collect electricity from overhead wires
Explanation:
A pantograph is an apparatus that maintains contact with overhead electrical lines to collect power for electric trains.
Q.388
Medium
Technical Knowledge (NTPC)
What is the standard height of platforms at railway stations in India?
A
0.5 meters
B
0.75 meters
C
1 meter
D
1.25 meters
Correct Answer:
B. 0.75 meters
Explanation:
Standard platform height in Indian Railways is 0.75 meters (2.5 feet) for broad gauge to ensure safe passenger boarding.
Q.389
Easy
Technical Knowledge (NTPC)
Which of the following is a characteristic of an express train compared to a local train?
A
Lower ticket price
B
Fewer stops and higher speed
C
More stops and lower speed
D
More passenger comfort only
Correct Answer:
B. Fewer stops and higher speed
Explanation:
Express trains have fewer intermediate stops, allowing them to maintain higher average speeds compared to local trains.
Q.390
Easy
Technical Knowledge (NTPC)
In railway signaling, what does a red signal indicate?
A
Proceed with caution
B
Stop - do not proceed
C
Reduce speed
D
Wait for further instructions
Correct Answer:
B. Stop - do not proceed
Explanation:
A red signal in railway signaling is a mandatory stop signal indicating that trains must not proceed beyond that point.