Please keep at least one language enabled. || కనీసం ఒక భాషను ఎంచుకోండి.
Question 1
ప్రశ్న 1
Which description most accurately identifies the permanent way of a conventional ballasted railway line?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
A permanent way is the engineered track structure and its supporting foundation. The rails guide the wheelsets and receive wheel loads. Sleepers, fastenings and ballast retain track geometry while transferring forces through the structure. The formation provides the underlying support and must remain stable and adequately drained. Safe operation depends on the performance of these components as a connected system rather than on the rails alone.
వివరణ:
Question 2
ప్రశ్న 2
A wheel load acts vertically on a conventional ballasted railway track. Which sequence best represents the principal load-transfer path to the underlying soil?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The wheel transmits contact force directly to the running rail. The rail distributes that force to one or more supported rail seats through the fastening and pad assembly. Sleepers spread the reaction over a wider area of ballast. Ballast further disperses load to the formation and underlying soil. The actual distribution among sleepers depends on rail stiffness and support conditions, so a single wheel load need not act on just one sleeper.
వివరణ:
Question 3
ప్రశ్న 3
Which statement correctly defines railway track gauge and states the nominal Indian Railways broad-gauge dimension on straight track?
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Explanation:
Track gauge describes the lateral separation between the running faces of the two rails at the specified measurement position. The nominal broad gauge on Indian Railways is 1676 mm. It is not the centre spacing of sleepers or the width of the ballast formation. Correct gauge is maintained by sleeper geometry and effective rail fastenings. Gauge variations must be assessed against applicable track-maintenance tolerances rather than presumed acceptable merely because the nominal value is known.
వివరణ:
Question 4
ప్రశ్న 4
Why must a running rail be designed for more than the direct vertical compression produced at wheel contact?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Running rails are subjected to concentrated wheel-contact forces and distribute them along the track. They bend between successive sleeper supports and experience bending stresses. Wheel–rail interaction also produces lateral forces, particularly on curves and through irregularities. Longitudinal forces can arise from braking, traction and temperature restraint. Rail section, support and maintenance must therefore address multiple actions rather than a single compressive load.
వివరణ:
Question 5
ప్రశ్న 5
A proposed straight track uses two rails, each 250 m long, of nominal mass 60 kg per metre. Neglecting welds, cut-offs and fittings, what is the combined mass of the rails?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
A nominal 60 kg/m rail has a mass of 60 kg for each metre of rail length. Each of the two rails is 250 m long. Their combined length is therefore 2 times 250 = 500 m. Multiplying 500 m by 60 kg/m gives 30000 kg, or 30 tonnes. This estimate excludes sleepers, fastenings, ballast and any rail wastage during fabrication.
వివరణ:
Question 6
ప్రశ్న 6
Compared with a track having numerous conventional fish-plated joints, what is a major operational benefit and associated engineering responsibility of using long welded rails?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Mechanical rail joints can introduce impact, noise and localized deterioration under passing wheels. Welded rail construction reduces the frequency of those discontinuities. However, constrained rail expansion and contraction can generate significant longitudinal thermal forces. Fastenings, sleepers, ballast shoulders and formation stability contribute to the safe resistance of such forces. Welding therefore improves continuity but does not eliminate the need for careful track-stability management.
వివరణ:
Question 7
ప్రశ్న 7
A railway inspection finds recurring short-pitch corrugation on the running surface of a rail, together with elevated vibration as trains pass. Which interpretation and action are most defensible?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Rail-head corrugation consists of repeated surface irregularities along the running rail. Wheelsets travelling over these irregularities can produce vibration and fluctuating contact forces. These effects may accelerate deterioration of rails and associated track components. The inspection should determine the extent of damage and contributing vehicle–track conditions. Rail grinding or other approved remedial measures may then be appropriate, rather than treating correct gauge as sufficient evidence of a sound rail surface.
వివరణ:
Question 8
ప్రశ్న 8
Which statement most accurately combines the principal engineering functions of railway sleepers?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleepers connect the two running rails through the fastening assemblies. They maintain gauge and help preserve alignment and cross-level. The sleeper contact with ballast distributes rail reactions to a larger support area. Sleeper–ballast interaction contributes lateral and longitudinal track restraint. Appropriate sleeper condition and spacing are therefore important to stability, track geometry and riding quality.
వివరణ:
Question 9
ప్రశ్న 9
Why are monoblock prestressed-concrete sleepers widely used in modern Indian Railways ballasted main-line track with elastic fastening assemblies?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Prestressed-concrete sleepers provide durable and dimensionally stable rail support. Their weight and interaction with properly packed ballast contribute to the stability of the track frame. Suitable shapes also facilitate mechanized tamping and related maintenance. Rail pads and elastic clips remain important for the required resilience and fastening force. The performance of a concrete-sleeper track therefore depends on the complete sleeper, fastening and ballast assembly.
వివరణ:
Question 10
ప్రశ్న 10
A trial section adopts uniform sleeper centre spacing of 0.625 m along a long straight railway line. Ignoring end effects, what is the nominal sleeper density per kilometre?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleeper density can be estimated as track length divided by average sleeper spacing. One kilometre of track is 1000 m. Dividing 1000 by 0.625 gives 1600 sleepers per kilometre. This is a geometric estimate for the stated uniformly spaced hypothetical track. Compliance with the minimum sleeper density prescribed for a particular railway route must be checked separately.
వివరణ:
Question 11
ప్రశ్న 11
Sleepers are to be placed at exactly 0.60 m centre-to-centre spacing along a 120 m straight trial panel, with a sleeper centre at each end. How many sleepers are required?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The panel length is 120 m and the spacing is 0.60 m. The number of equal intervals along the panel is 120/0.60 = 200. A sleeper centre occurs at both endpoints, so there is one more sleeper than the number of intervals. The required count is therefore 201 sleepers. The calculation is an idealized setting-out exercise and does not prescribe actual end spacing or layout at rail joints.
వివరణ:
Question 12
ప్రశ్న 12
In a simplified static model, a 200 kN railway axle transfers equal vertical load to two rails. Assume the reaction on each rail is shared equally by four sleeper rail seats and neglect dynamic effects. What reaction acts at each of those rail seats?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The given axle load is 200 kN and is split equally between the two rails. Each rail therefore initially receives 100 kN. The hypothetical model distributes this rail load equally among four sleeper rail seats. Each rail-seat reaction is consequently 100/4 = 25 kN. Actual rail-seat reactions are not uniform and depend on rail bending stiffness, support spacing and dynamic wheel loading.
వివరణ:
Question 13
ప్రశ్న 13
Several sleepers near a rail joint have voids beneath their bearing areas, and the rail deflects noticeably when a train passes. What is the most likely maintenance implication?
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Explanation:
Sleepers require a stable bearing on the supporting ballast to distribute forces effectively. Voids beneath a sleeper can reduce its contribution to rail support. A passing wheel may then cause excessive local deflection and transfer higher dynamic loads to nearby sleepers. This can accelerate settlement and worsen track geometry. The corrective work should address the support condition and the cause of the void rather than simply loosening the fastening assembly.
వివరణ:
Question 14
ప్రశ్న 14
Which ballast material characteristics are generally desirable for conventional high-load ballasted track?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Ballast is expected to transmit sleeper loads while retaining the geometry of the track. Strong angular particles develop useful interlock and resistance to lateral movement. Adequate voids permit drainage and enable maintenance packing around sleepers. Weak or friable aggregate tends to break down and generate fines under traffic. A high proportion of fines can impair drainage and reduce the effectiveness of the ballast layer.
వివరణ:
Question 15
ప్రశ్న 15
Two otherwise comparable ballasted track sections experience monsoon rainfall. One section has clean ballast and functioning side drains, whereas the other has clogged outlets and retained water. What is the principal engineering difference expected?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Drainage protects the ballast bed and the underlying formation from persistent water accumulation. When water is retained, moisture-sensitive soils can soften and lose stiffness. Fine-particle migration can also accelerate ballast contamination and settlement. Clean ballast with an effective outlet allows infiltrating water to leave the track structure. Drainage thus contributes to support stability, reduced geometry defects and lower maintenance demand.
వివరణ:
Question 16
ప్రశ్న 16
A sleeper is idealized as transferring a 72 kN vertical reaction uniformly through an effective ballast-contact area of 0.24 m². What is the average bearing pressure at this interface?
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Explanation:
Average bearing pressure is the applied force divided by the effective contact area. The specified reaction is 72 kN. The assumed bearing area is 0.24 m². Division gives 72/0.24 = 300 kN/m², equivalent to 300 kPa. Actual sleeper–ballast pressure is not perfectly uniform, so this represents the stated simplified average rather than a local peak pressure.
వివరణ:
Question 17
ప్రశ్న 17
During rehabilitation of long welded rail on ballasted track, the ballast shoulders are substantially reduced before trains resume. Why should this condition receive particular engineering attention?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Long welded rails can develop significant longitudinal compressive forces with rising rail temperature. The track frame resists lateral distortion through its stiffness and interaction with the ballast. Ballast shoulders and cribs contribute to the available lateral resistance. Disturbing these regions can reduce track stability until the required support and resistance are restored. Appropriate maintenance precautions and the applicable railway instructions are therefore necessary before normal operation resumes.
వివరణ:
Question 18
ప్రశ్న 18
A ballasted track shows persistent muddy spots, rapid loss of cross-level and visible contamination of ballast with fine particles. Which diagnosis and action are most appropriate?
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Explanation:
Fine material in the ballast reduces void connectivity and impairs drainage. Repeated wet loading can cause pumping and progressive settlement when the foundation is susceptible. Loss of level and muddy patches therefore justify inspection below the rail seat rather than focusing only on rail condition. Screening or renewal of ballast may restore its drainage and packing characteristics. If the formation is weak or persistently wet, the underlying cause also requires treatment to prevent recurrence.
వివరణ:
Question 19
ప్రశ్న 19
A track formation consists of a fine-grained soil that could migrate into the coarse ballast under wet repeated loading. What is the principal reason for introducing a properly designed blanket or separation layer between formation and ballast?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
A blanket layer can provide a more suitable interface between coarse ballast and fine formation soil. Proper gradation or compatible separation material helps restrain the migration of fines. It may also improve load distribution and working-platform conditions. Drainage compatibility is important because trapped water can compromise the formation. The need and thickness of the layer depend on soil characteristics and applicable railway design requirements.
వివరణ:
Question 20
ప్రశ్న 20
A section has adequate rail, sleeper and ballast specifications but repeated uneven settlement from a weak, poorly drained embankment formation. Which statement best captures the formation's role?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The formation forms the lower supporting part of the permanent-way system. It receives the dispersed loading transmitted through ballast and sleepers. If its stiffness or moisture condition varies greatly, the track can settle unevenly. Repeated geometry correction without addressing foundation weakness may therefore provide only temporary improvement. Formation rehabilitation, water control and appropriate separation layers may be required for durable track performance.
వివరణ:
Question 21
ప్రశ్న 21
Two measurement stations on a straight railway track are 5 m apart. The signed cross-level readings are +18 mm and +3 mm, using the same reference convention. If track twist magnitude is defined for this exercise as the absolute change in cross-level divided by the separation, what is it?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The exercise explicitly defines the twist magnitude as cross-level change per unit track length. Both cross-level readings use the same sign convention. Their absolute difference is |18 - 3| = 15 mm. Dividing by the 5 m separation gives 3.0 mm/m. The numerical result should be checked against the applicable maintenance limit only after considering the prescribed measurement base and track category.
వివరణ:
Question 22
ప్రశ్న 22
An inspection of prestressed-concrete sleeper track reveals several elastic rail clips with inadequate toe load. Which consequence most directly explains the need for corrective maintenance?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Elastic rail clips develop a controlled clamping force at the rail foot. This force helps maintain the rail in its intended position relative to the sleeper assembly. Inadequate toe load can reduce effective longitudinal restraint and contribute to unwanted movement. It can also affect the behaviour and service life of rail pads and liners. The fastening assembly should therefore be inspected and restored in accordance with approved maintenance practices.
వివరణ:
Question 23
ప్రశ్న 23
What is the primary engineering function of a grooved rubber sole plate or suitable resilient rail pad between a rail foot and a concrete sleeper?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The rail pad lies between the rail foot and the supporting sleeper seat. Its compliant material reduces concentrated contact and helps distribute bearing action. It can attenuate shocks and higher-frequency vibration transmitted to the concrete sleeper. Its frictional properties also interact with the fastening assembly's longitudinal restraint. The pad does not replace approved clips, sleepers or ballast in the permanent-way system.
వివరణ:
Question 24
ప్రశ్న 24
In a track-circuited section with prestressed-concrete sleepers, what is a key reason for specifying suitable insulating liners as part of an approved elastic rail-fastening system?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Liners are components of the rail fastening and rail-seat arrangement. Their dimensions help locate the rail and obtain the required clip deflection and fastening force. Insulating liner materials can also help maintain the electrical isolation needed in track-circuited locations. This function is distinct from ballast drainage and physical load spreading by sleepers. The correct type must be selected as part of the approved compatible fastening assembly.
వివరణ:
Question 25
ప్రశ్న 25
A recently maintained long-welded-rail section develops increasing lateral alignment irregularity during hot weather, with disturbed ballast shoulders, several loose clips and weak formation support. Which engineering response best addresses the combined risk?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
High rail temperature can generate compressive forces in constrained welded rails. Inadequate ballast shoulders reduce lateral resistance while defective clips weaken rail-to-sleeper restraint. A weak formation can also permit movement and aggravate geometry deterioration. These conditions act together rather than as unrelated cosmetic defects. The correct response is a coordinated safety and maintenance assessment addressing the track frame, ballast, foundation and operating restrictions as necessary.
వివరణ:
Answer Key సమాధానాల పట్టిక
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Question 1 ప్రశ్న 1Answer: B. The integrated track system of rails, sleepers, fastenings, ballast and supporting formation that guides trains and transmits their loads to the ground. సమాధానం: B.
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Question 2 ప్రశ్న 2Answer: D. Wheel, rail, rail seat and sleeper, ballast, formation and underlying soil. సమాధానం: D.
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Question 3 ప్రశ్న 3Answer: A. Gauge is the distance between the inner running faces of the two rails measured at the prescribed gauge location; the nominal broad gauge is 1676 mm. సమాధానం: A.
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Question 4 ప్రశ్న 4Answer: C. The rail acts as a beam between supports while also guiding flanged wheels and resisting vertical, lateral and longitudinal actions. సమాధానం: C.
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Question 5 ప్రశ్న 5Answer: D. 30 tonnes. సమాధానం: D.
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Question 6 ప్రశ్న 6Answer: B. Fewer mechanical joints can reduce impact and maintenance, but thermal forces and track stability must still be managed. సమాధానం: B.
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Question 7 ప్రశ్న 7Answer: C. Periodic surface irregularities can increase wheel–rail dynamic forces; the cause and severity should be assessed and an appropriate rail-surface maintenance treatment considered. సమాధానం: C.
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Question 8 ప్రశ్న 8Answer: A. They maintain the relative rail positions, provide rail seats, distribute rail reactions to ballast and help resist longitudinal and lateral track forces. సమాధానం: A.
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Question 9 ప్రశ్న 9Answer: D. They provide durable rail support and track restraint suitable for mechanized maintenance, while pads and approved fastenings supply the necessary rail-seat characteristics. సమాధానం: D.
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Question 10 ప్రశ్న 10Answer: B. 1600 sleepers/km. సమాధానం: B.
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Question 11 ప్రశ్న 11Answer: C. 201 sleepers. సమాధానం: C.
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Question 12 ప్రశ్న 12Answer: A. 25 kN. సమాధానం: A.
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Question 13 ప్రశ్న 13Answer: C. The poor support can produce impact and uneven load sharing, requiring investigation and restoration of proper packing and underlying support. సమాధానం: C.
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Question 14 ప్రశ్న 14Answer: D. Hard, durable, angular and suitably graded stone providing interlock, stable packing and drainage voids. సమాధానం: D.
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Question 15 ప్రశ్న 15Answer: B. The well-drained section is less exposed to subgrade softening and ballast fouling-related loss of support, supporting more stable track geometry. సమాధానం: B.
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Question 16 ప్రశ్న 16Answer: A. 300 kPa. సమాధానం: A.
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Question 17 ప్రశ్న 17Answer: D. Ballast shoulder and crib resistance contribute to lateral restraint of the track frame, particularly when compressive thermal forces can promote buckling. సమాధానం: D.
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Question 18 ప్రశ్న 18Answer: C. Ballast fouling and possible formation distress should be investigated, followed by suitable drainage, screening or renewal and foundation treatment as needed. సమాధానం: C.
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Question 19 ప్రశ్న 19Answer: A. To provide separation or filtration and improve the support interface, limiting fine migration while permitting appropriate drainage. సమాధానం: A.
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Question 20 ప్రశ్న 20Answer: B. Formation is the supporting earthwork or prepared foundation that must provide stable, reasonably uniform support and suitable drainage to the overlying track structure. సమాధానం: B.
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Question 21 ప్రశ్న 21Answer: D. 3.0 mm/m. సమాధానం: D.
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Question 22 ప్రశ్న 22Answer: C. Reduced clamping can weaken rail restraint and allow undesirable relative movement or deterioration of rail-seat components. సమాధానం: C.
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Question 23 ప్రశ్న 23Answer: A. To provide a compliant bearing interface, distribute rail-seat contact and attenuate high-frequency impact and vibration. సమాధానం: A.
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Question 24 ప్రశ్న 24Answer: B. They help position the rail foot and maintain electrical insulation of fastening components where required, while preserving the designed fastening geometry. సమాధానం: B.
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Question 25 ప్రశ్న 25Answer: D. Assess thermal and traffic-related stability and restore fastening restraint, ballast confinement and formation support under applicable safety procedures before normal operation. సమాధానం: D.