Railway RRB / NTPC
NTPC, Group D, JE — all sections
79 Questions 10 Topics Take Test
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Showing 1–10 of 79 questions
In the context of Indian Railway brake systems, what distinguishes an 'air brake' from a 'vacuum brake'?
A Air brakes use compressed air pressure while vacuum brakes use pressure difference to apply brakes
B Vacuum brakes are faster than air brakes
C Air brakes are only used on freight trains
D Vacuum brakes do not require any mechanical linkage
Correct Answer:  A. Air brakes use compressed air pressure while vacuum brakes use pressure difference to apply brakes
EXPLANATION

Air brakes operate using compressed air to push brake pistons, while vacuum brakes use the pressure difference created by partial vacuum to apply braking force. Modern Indian Railways predominantly use air brake systems.

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In the latest 2024-2025 Indian Railways safety statistics, which zone has shown maximum improvement in accident prevention?
A Northern Railway Zone
B Central Railway Zone
C Data-driven zones with modern signaling systems
D South Eastern Railway Zone
Correct Answer:  C. Data-driven zones with modern signaling systems
EXPLANATION

Zones with modern automatic block signaling, level crossing gates, and CCTV monitoring systems have demonstrated maximum improvement in accident prevention in recent statistics.

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Which of the following is the correct sequence of air brake components in Indian Railways from pressure source to wheels?
A Compressor → Reservoir → Control valve → Brake cylinder
B Reservoir → Compressor → Brake cylinder → Control valve
C Control valve → Compressor → Reservoir → Brake cylinder
D Brake cylinder → Reservoir → Compressor → Control valve
Correct Answer:  A. Compressor → Reservoir → Control valve → Brake cylinder
EXPLANATION

The correct sequence is: Air compressor generates compressed air → stored in reservoir → regulated through control valve → transmitted to brake cylinders on wheels.

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Which of the following best describes the function of 'creep' in railway tracks?
A Longitudinal movement of rails due to stress and temperature changes
B Vertical settling of the track over time
C Lateral deviation of the track alignment
D Rust formation on rail surfaces
Correct Answer:  A. Longitudinal movement of rails due to stress and temperature changes
EXPLANATION

Creep refers to the slow longitudinal movement of rails caused by train movements, thermal stress, and environmental factors.

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What is the maximum permissible speed for a train on a sharp curve with a radius of 400 meters in Indian Railways?
A 40 km/h
B 60 km/h
C 80 km/h
D 100 km/h
Correct Answer:  B. 60 km/h
EXPLANATION

For a curve radius of 400 meters, the maximum safe speed is approximately 60 km/h to prevent derailment due to centrifugal forces.

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What is the purpose of a vacuum brake system in trains?
A To increase train speed
B To create air pressure for cooling
C To apply brakes using vacuum pressure differential
D To prevent wheel skidding
Correct Answer:  C. To apply brakes using vacuum pressure differential
EXPLANATION

A vacuum brake system applies brakes by creating a pressure difference between the brake cylinder and atmosphere.

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What does SCADA stand for in railway operations?
A Supervisory Control and Data Acquisition
B Signal Control and Dispatch Automation
C Station Command and Drive Alerting
D Speed Control and Distance Anticipation
Correct Answer:  A. Supervisory Control and Data Acquisition
EXPLANATION

SCADA (Supervisory Control and Data Acquisition) is a system for monitoring and controlling railway infrastructure remotely.

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What does ACSM stand for in railway signaling?
A Automatic Coupling and Safety Module
B Axle Counter and Signal Management
C Automatic Colour Signal Module
D Axle Counting and Safety Monitoring
Correct Answer:  D. Axle Counting and Safety Monitoring
EXPLANATION

ACSM (Axle Counting and Safety Monitoring) is a modern railway safety system for train detection.

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Which safety device automatically applies brakes if a train exceeds safe speed on curves?
A Speed Governor
B Overspeed Protection System (OPS)
C Automatic Train Protection (ATP)
D Vigilance Device
Correct Answer:  C. Automatic Train Protection (ATP)
EXPLANATION

Automatic Train Protection (ATP) is a safety system that automatically applies brakes if a train exceeds safe speed limits on curves or approaches.

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What is the minimum turning radius for broad gauge railway tracks?
A 200 meters
B 300 meters
C 400 meters
D 500 meters
Correct Answer:  B. 300 meters
EXPLANATION

The minimum turning radius for broad gauge tracks is approximately 300 meters to ensure safe operations.

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