Govt. Exams
Entrance Exams
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.
Zones with modern automatic block signaling, level crossing gates, and CCTV monitoring systems have demonstrated maximum improvement in accident prevention in recent statistics.
The correct sequence is: Air compressor generates compressed air → stored in reservoir → regulated through control valve → transmitted to brake cylinders on wheels.
Creep refers to the slow longitudinal movement of rails caused by train movements, thermal stress, and environmental factors.
For a curve radius of 400 meters, the maximum safe speed is approximately 60 km/h to prevent derailment due to centrifugal forces.
A vacuum brake system applies brakes by creating a pressure difference between the brake cylinder and atmosphere.
SCADA (Supervisory Control and Data Acquisition) is a system for monitoring and controlling railway infrastructure remotely.
ACSM (Axle Counting and Safety Monitoring) is a modern railway safety system for train detection.
Automatic Train Protection (ATP) is a safety system that automatically applies brakes if a train exceeds safe speed limits on curves or approaches.
The minimum turning radius for railway tracks depends on the gauge width and safe operating speed. For broad gauge (1676 mm) Indian railways, standard design specifications determine this value.
Broad gauge in India has a track width of \(1676\,\text{mm}\) (or \(5\,\text{ft}\,6\,\text{in}\)). The turning radius is calculated based on safe curvature limits to prevent derailment and ensure passenger comfort.
The minimum turning radius for curves on broad gauge tracks follows the standard formula:
where \(v\) is speed, \(g\) is gravity, \(e\) is banking, and \(f\) is friction coefficient. For broad gauge at standard operating speeds, this yields a practical minimum.
Indian Railways specifications for broad gauge tracks establish that the absolute minimum turning radius for safe operation is determined by track geometry and safety margins:
This value accounts for:
- Track stability at curves
- Passenger safety and comfort
- Prevention of rail wear and derailment
- Standard gauge width of \(1676\,\text{mm}\)
Comparing with given options:
- 200 m, 300 m, 400 m are larger and used for higher speeds
- \(175\,\text{m}\) is the minimum threshold for broad gauge
Answer: The minimum turning radius for broad gauge railway tracks is \(175\,\text{meters}\) (Option D)
About Railway RRB Practice on iGET
The Railway Recruitment Board (RRB) conducts multiple exams to fill thousands of vacancies in Indian Railways every year — including NTPC (Non-Technical Popular Categories), Group D (Track Maintainer, Helper, Assistant Pointsman), ALP (Assistant Loco Pilot), Junior Engineer, and Technician. Most exams have two CBT stages plus skill/document verification.
iGET's railway practice covers all common sections: Mathematics (arithmetic, percentage, ratio, time-speed-distance), General Intelligence & Reasoning (analogies, coding-decoding, syllogism), General Science (Physics, Chemistry, Biology — up to Class 10 NCERT level), and General Awareness (current affairs, history, geography, polity, economy).
Why prepare with iGET
Free access to thousands of railway-specific MCQs, mock tests matching the exact CBT pattern, negative marking simulation, NCERT-aligned science questions, and current affairs updated monthly. Topic-wise practice helps you identify and fix weak areas before the real exam.
Strategy tip
Railway exams are competitive — selection cutoffs are usually 70-80%. Mathematics and Reasoning together carry 75 marks out of 100 in NTPC CBT-1; mastering these two sections alone can secure your spot. Practice 100+ questions daily.
