Please keep at least one language enabled. || కనీసం ఒక భాషను ఎంచుకోండి.
Question 1
ప్రశ్న 1
A railway track is subjected to repeated vertical wheel loads, lateral forces on curves and longitudinal braking forces. Which statement best describes the combined structural functions of sleepers?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleepers form the intermediate structural elements between rails and the supporting ballast. They maintain the relative position of the two running rails and help preserve the required track gauge. Rail reactions are distributed through sleeper bearing areas to the ballast bed. The sleeper and fastening assembly also resists longitudinal and lateral forces transmitted through the rails. Adequate sleeper support and condition are therefore essential for load distribution, track geometry and riding quality.
వివరణ:
Question 2
ప్రశ్న 2
Which combination of properties is most desirable for a good railway sleeper intended for repeated heavy-axle loading on a ballasted track?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
A good sleeper must withstand repeated rail-seat loading without unacceptable cracking or deformation. It must maintain the designed gauge and provide a suitable interface for rail fastenings. Its bearing arrangement should distribute loads to the ballast without producing excessive local pressure. Durability against the expected environmental exposure is important for long-term service. The sleeper must also permit inspection, replacement and restoration of track geometry during maintenance.
వివరణ:
Question 3
ప్రశ్న 3
A train wheel applies a vertical force to a conventional ballasted track supported by prestressed-concrete sleepers. Which sequence most accurately describes the principal transmission of that force?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The train wheel transmits its contact force to the running rail. The rail distributes load through its bending action to nearby rail-seat assemblies. The sleepers receive these reactions and distribute them over their effective ballast-contact areas. The ballast spreads the transmitted forces to the formation and underlying soil. The actual proportion of load carried by individual sleepers depends on rail stiffness, support conditions and wheel position.
వివరణ:
Question 4
ప్రశ్న 4
A railway maintenance engineer examines timber sleepers remaining in an older bridge track. Which characteristic explains their historical usefulness where relatively easy handling and site modification are required?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Timber sleepers have historically been used where ease of handling and fitting is important. Their material provides a relatively resilient interface under rail loading. Timber can also be drilled or shaped for certain approved rail-seat and fastening arrangements. However, deterioration from moisture, biological attack and fastening wear can reduce performance. Existing timber sleepers therefore require appropriate inspection, preservation and renewal rather than being assumed suitable indefinitely.
వివరణ:
Question 5
ప్రశ్న 5
An older railway section contains timber sleepers exposed to persistent rainfall and biological deterioration. Which intervention best addresses the characteristic durability limitation of this sleeper material?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Timber is susceptible to deterioration when exposed to unsuitable moisture and biological conditions. Decay can reduce the bearing strength of the sleeper and the holding capacity of its fastenings. Appropriate preservation can improve durability when used according to the relevant procedures. Sleepers that have lost adequate strength or fastening retention require replacement. Increasing rail mass or reducing sleeper support does not correct deterioration of the timber itself.
వివరణ:
Question 6
ప్రశ్న 6
An existing track contains steel-trough sleepers, and inspection reveals corrosion, cracks near rail seats and enlargement of fastening holes. Which assessment is technically most appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Steel-trough sleepers were historically used in railway permanent-way construction. Their metal surfaces can corrode, particularly in environments with persistent moisture or corrosive exposure. Repeated rail-seat forces may also contribute to cracking and deterioration around fastening locations. Wear and enlargement of fastening holes can reduce the effectiveness of the rail connection. Such sleepers require condition-based assessment and appropriate reconditioning or replacement where permitted.
వివరణ:
Question 7
ప్రశ్న 7
An older railway siding contains cast-iron sleepers with visible cracks near the rail seats and worn fastening lugs. Which conclusion best reflects the engineering limitations of cast-iron sleeper systems?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Cast-iron sleepers were used in several historical railway track arrangements. Cast iron is relatively brittle compared with more ductile structural materials. Cracking near rail seats can reduce the ability of the sleeper assembly to support repeated loading. Worn lugs and associated fastening components may permit unwanted rail movement or loss of fastening effectiveness. The condition must therefore be assessed and defective sleepers renewed or otherwise treated according to applicable railway instructions.
వివరణ:
Question 8
ప్రశ్న 8
Which statement correctly describes the predominant sleeper practice identified in the Indian Railways Permanent Way Manual 2024?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Modern Indian Railways ballasted track predominantly uses monoblock prestressed-concrete sleepers. Their structural configuration supports accurate rail-seat geometry and effective load distribution. They also provide useful longitudinal and lateral stability when properly supported by ballast. Wooden, cast-iron and steel-trough sleepers represent older permanent-way technologies and are not the normal choice for modern main-line renewals. Special locations may require other approved sleeper materials or arrangements.
వివరణ:
Question 9
ప్రశ్న 9
What is the principal structural purpose of prestressing in a monoblock prestressed-concrete railway sleeper?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Concrete has relatively limited tensile strength compared with its compressive strength. Prestressing introduces compression into selected regions of a concrete member before significant service loading occurs. This compression helps counteract tensile stresses generated by rail-seat and ballast reactions. Proper prestress design can therefore improve crack resistance and fatigue performance. Prestressing does not remove the need for appropriate concrete quality, reinforcement detailing, rail pads or ballast support.
వివరణ:
Question 10
ప్రశ్న 10
A newly constructed prestressed-concrete sleeper track experiences excessive rail-seat vibration despite apparently adequate ballast support. Which combination of components should be examined for the required rail-seat resilience and restraint?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Prestressed concrete is a relatively stiff material and does not independently provide every required rail-seat property. Rail pads offer a compliant interface between the rail foot and concrete sleeper. Elastic clips provide the designed rail-clamping force and contribute to restraint. Liners help position the rail and may provide required electrical insulation. These components must function together to control rail-seat movement, vibration and deterioration.
వివరణ:
Question 11
ప్రశ్న 11
A railway section uses track circuits for train detection, and a batch of prestressed-concrete sleepers is marked FTC while another batch is marked NFTC. Which interpretation is correct for selecting sleepers at that location?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Track circuits require suitable electrical separation between the rails and associated components. Prestressed-concrete sleepers are assessed for the electrical resistance required by relevant railway procedures. The FTC marking identifies sleepers classified as fit for track-circuited locations. NFTC denotes sleepers not classified as fit for that purpose. Correct sleeper selection must be accompanied by compatible insulating liners, pads and fastenings where specified.
వివరణ:
Question 12
ప్రశ్న 12
Under the Indian Railways Permanent Way Manual 2024, how is sleeper density ordinarily expressed for railway track maintenance and construction?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleeper density indicates how many sleepers are provided along a specified track length. Current Indian Railways permanent-way practice expresses this density in sleepers per kilometre. The required density depends on the category of railway line and relevant operating conditions. Maximum permissible speed and traffic considerations are important selection factors. The density does not by itself describe sleeper material strength or the quality of ballast support.
వివరణ:
Question 13
ప్రశ్న 13
According to the Indian Railways Permanent Way Manual 2024, what minimum sleeper density is specified for new main lines and passenger running loop lines within the stated scope of the manual?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The current permanent-way manual specifies minimum sleeper-density requirements for different railway line categories. New main lines and passenger running loop lines covered by the stated provision require at least 1660 sleepers per kilometre. Other lower-speed sidings and loop lines may have different prescribed minima. Higher density can be adopted where justified and approved under the relevant provisions. Historical sleeper-density conventions should not be substituted for these current requirements.
వివరణ:
Question 14
ప్రశ్న 14
A railway siding is designed for a maximum permissible speed of 45 km/h, while another siding is intended for 60 km/h. Under the specified Indian Railways Permanent Way Manual 2024 sleeper-density provisions, which minimum-density pairing is appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The manual distinguishes lower-speed loop lines and sidings from sidings operating above 50 km/h. A siding with permissible speed up to 50 km/h falls within the provision specifying 1540 sleepers per kilometre. A siding with permissible speed greater than 50 km/h requires the higher specified minimum of 1660 sleepers per kilometre. The two proposed speeds are 45 km/h and 60 km/h respectively. Therefore the appropriate minimum-density pairing is 1540 and 1660 sleepers per kilometre.
వివరణ:
Question 15
ప్రశ్న 15
A new railway main-line section is 2.5 km long, and the specified uniform sleeper-density basis is 1660 sleepers/km. Ignoring end effects and special trackwork, how many sleepers are required under this quantity-estimation convention?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The required quantity is calculated from the prescribed sleeper density and track length. The density is 1660 sleepers per kilometre. The length of the section is 2.5 km. Multiplying 1660 by 2.5 gives 4150 sleepers. The estimate ignores end adjustments, points and crossings and other nonuniform spacing arrangements as explicitly stated.
వివరణ:
Question 16
ప్రశ్న 16
A long railway section has a uniform sleeper density of 1660 sleepers per kilometre. Neglecting end effects, what is the corresponding average centre-to-centre spacing, approximately to the nearest millimetre?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Average spacing is the track length divided by the number of sleepers within that length. One kilometre equals 1000 m. The spacing is therefore 1000/1660 = approximately 0.60241 m. Converting this to millimetres gives approximately 602.41 mm. The spacing rounded to the nearest millimetre is 602 mm, subject to actual construction setting-out and applicable approved layouts.
వివరణ:
Question 17
ప్రశ్న 17
A straight trial railway panel is exactly 120 m long. Sleepers are placed at uniform 0.60 m centre-to-centre spacing, with one sleeper centre at each endpoint. What is the total number of sleepers?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The number of intervals is obtained by dividing the panel length by sleeper spacing. The panel is 120 m long and the spacing is 0.60 m. Therefore the number of intervals is 120/0.60 = 200. Because sleeper centres are required at both endpoints, the number of sleepers is one greater than the number of intervals. The total is consequently 201 sleepers.
వివరణ:
Question 18
ప్రశ్న 18
During a sleeper-renewal proposal, the specified density increases from 1540 to 1660 sleepers/km over a 1.5 km section. Ignoring end effects and special layouts, how many additional sleepers does the higher density require?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The increase in density is the difference between the proposed and existing values. This difference is 1660 - 1540 = 120 sleepers per kilometre. The affected track length is 1.5 km. Multiplying 120 by 1.5 gives 180 additional sleepers. The calculation estimates the increased sleeper quantity and does not include any special spacing required at turnouts or other track features.
వివరణ:
Question 19
ప్రశ్న 19
An engineer proposes uniform sleeper spacing of 0.625 m for a new main-line railway track. If the applicable minimum density is 1660 sleepers/km, which assessment is correct when end effects are neglected?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleeper density is calculated as track length divided by sleeper spacing. With a spacing of 0.625 m, the density is 1000/0.625 = 1600 sleepers per kilometre. The specified minimum for the proposed main line is 1660 sleepers per kilometre. The shortfall is therefore 1660 - 1600 = 60 sleepers per kilometre. The proposed uniform spacing requires revision to satisfy the stated minimum-density requirement.
వివరణ:
Question 20
ప్రశ్న 20
A railway sleeper transfers a vertical reaction of 72 kN uniformly over an assumed effective ballast-contact area of 0.24 m². What is the average bearing pressure at this interface?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Average bearing pressure is calculated by dividing the applied force by the effective contact area. The specified sleeper reaction is 72 kN. The effective bearing area is 0.24 m². Therefore the pressure is 72/0.24 = 300 kN/m², equivalent to 300 kPa. Actual ballast contact stresses are nonuniform, so this represents only the assumed average pressure.
వివరణ:
Question 21
ప్రశ్న 21
In a simplified static analysis of a railway track, a 120 kN vertical load on one rail is assumed to be shared equally by four sleeper rail seats. Neglecting dynamic effects and support variability, what reaction is carried by each rail seat?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The question specifies a total rail load of 120 kN. The load is assumed to be distributed equally among four rail-seat supports. Dividing 120 kN by four gives 30 kN at each rail seat. This result depends on the equal-sharing assumption. In actual track, rail bending, sleeper spacing, ballast condition and wheel position cause unequal distribution of reactions.
వివరణ:
Question 22
ప్రశ్న 22
A prestressed-concrete sleeper track develops hanging sleepers and increasing vertical irregularities despite having adequate sleeper density. Which maintenance approach is most appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Adequate sleeper density does not guarantee uniform support beneath every sleeper. Hanging sleepers occur when the ballast does not provide effective bearing under some locations. Such conditions can increase local rail deflection and dynamic loading of adjacent supports. Corrective maintenance must address ballast packing and any underlying settlement or drainage deficiency. Track geometry should then be restored using the appropriate approved maintenance procedure.
వివరణ:
Question 23
ప్రశ్న 23
A railway authority is comparing sleeper materials for a new high-traffic main line. Which assessment most accurately accounts for the relative performance and limitations of the traditional sleeper materials?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Different sleeper materials exhibit different structural and durability characteristics. Timber can offer resilience and workability but may deteriorate biologically or suffer fastening wear. Steel sleepers can provide useful strength but may develop corrosion and local rail-seat defects. Cast-iron sleeper components are comparatively vulnerable to brittle cracking and fastening deterioration. Prestressed-concrete sleepers are the predominant modern choice for conventional Indian Railways main-line ballasted track because of their support, durability and track-stability characteristics.
వివరణ:
Question 24
ప్రశ్న 24
In a railway yard containing fish-plated track or short welded rails on prestressed-concrete sleepers, which sleeper-spacing arrangement is consistent with the relevant Indian Railways Permanent Way Manual provision?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleeper arrangements at rail joints depend on the rail construction and sleeper type. The current permanent-way guidance contains a specific provision for concrete sleepers in yards with fish-plated or short-welded-rail track. Uniform spacing at the fish-plated joint is required within that specified arrangement. Appropriate fish-plate details and sleeper support are also important for satisfactory joint performance. Historical spacing rules for other sleeper materials should not be applied automatically to this concrete-sleeper configuration.
వివరణ:
Question 25
ప్రశ్న 25
A heavily trafficked railway section has prestressed-concrete sleepers at the required density, but inspectors report loose elastic clips, cracked rail-seat regions, fouled ballast and progressive gauge deterioration. Which engineering judgement is most defensible?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Sleeper density is only one element of an effective permanent-way system. Rail-seat cracks can reduce sleeper integrity and compromise the support provided to the rail. Loose fastenings can weaken gauge maintenance and allow unwanted relative movement. Fouled ballast and deficient support can accelerate geometry deterioration under repeated loading. A coordinated inspection and maintenance response is therefore necessary to restore safe track performance.
వివరణ:
Answer Key సమాధానాల పట్టిక
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Question 1 ప్రశ్న 1Answer: B. Sleepers support and locate the rails, distribute rail reactions to ballast, maintain gauge and contribute to longitudinal and lateral track stability. సమాధానం: B.
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Question 2 ప్రశ్న 2Answer: D. Adequate strength and durability, stable rail-seat geometry, suitable load distribution, compatible fastening arrangements and maintainability. సమాధానం: D.
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Question 3 ప్రశ్న 3Answer: A. Wheel to rail, rail-seat assembly, sleeper, ballast, formation and underlying ground. సమాధానం: A.
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Question 4 ప్రశ్న 4Answer: C. Timber sleepers provide comparatively resilient support and can be worked or fitted more readily at site, subject to suitable strength and preservation requirements. సమాధానం: C.
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Question 5 ప్రశ్న 5Answer: B. Inspect for decay and fastening deterioration, apply suitable preservation measures where permitted, and replace unserviceable sleepers with approved alternatives. సమాధానం: B.
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Question 6 ప్రశ్న 6Answer: A. These are recognized deterioration modes of steel-trough sleepers that can reduce rail-seat integrity and fastening performance. సమాధానం: A.
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Question 7 ప్రశ్న 7Answer: D. Cast iron is relatively brittle, and cracking or deterioration of rail-seat and fastening components can compromise sleeper serviceability. సమాధానం: D.
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Question 8 ప్రశ్న 8Answer: C. Monoblock prestressed-concrete sleepers are predominantly used, while older wooden, cast-iron and steel-trough types are no longer the normal modern choice. సమాధానం: C.
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Question 9 ప్రశ్న 9Answer: A. To introduce beneficial compressive stress into the concrete and improve its resistance to service-load tensile cracking. సమాధానం: A.
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Question 10 ప్రశ్న 10Answer: C. Elastic rail clips, rail pads, liners and the compatibility and condition of the rail-seat fastening system. సమాధానం: C.
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Question 11 ప్రశ్న 11Answer: B. FTC identifies sleepers classified as fit for track circuiting, and their use must comply with the prescribed electrical-insulation and fastening requirements. సమాధానం: B.
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Question 12 ప్రశ్న 12Answer: D. As the number of sleepers per kilometre of track, selected with reference to permissible speed and traffic requirements. సమాధానం: D.
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Question 13 ప్రశ్న 13Answer: C. 1660 sleepers/km. సమాధానం: C.
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Question 14 ప్రశ్న 14Answer: A. 1540 sleepers/km for the 45 km/h siding and 1660 sleepers/km for the 60 km/h siding. సమాధానం: A.
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Question 15 ప్రశ్న 15Answer: B. 4150 sleepers. సమాధానం: B.
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Question 16 ప్రశ్న 16Answer: D. 602 mm. సమాధానం: D.
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Question 17 ప్రశ్న 17Answer: C. 201. సమాధానం: C.
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Question 18 ప్రశ్న 18Answer: A. 180 sleepers. సమాధానం: A.
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Question 19 ప్రశ్న 19Answer: D. The spacing provides 1600 sleepers/km and falls short of the specified minimum by 60 sleepers/km. సమాధానం: D.
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Question 20 ప్రశ్న 20Answer: B. 300 kPa. సమాధానం: B.
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Question 21 ప్రశ్న 21Answer: A. 30 kN. సమాధానం: A.
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Question 22 ప్రశ్న 22Answer: C. Restore adequate ballast packing and formation support, investigate drainage and correct the track geometry using approved maintenance methods. సమాధానం: C.
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Question 23 ప్రశ్న 23Answer: D. Prestressed-concrete sleepers offer durable modern track support, while timber requires decay management, steel may corrode and cast iron is vulnerable to brittle damage. సమాధానం: D.
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Question 24 ప్రశ్న 24Answer: B. Maintain uniform sleeper spacing at the fish-plated joints for the specified concrete-sleeper arrangement, with the relevant joint-fitting requirements also observed. సమాధానం: B.
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Question 25 ప్రశ్న 25Answer: C. Assess sleeper integrity, fastening restraint, ballast condition and underlying support together, and implement coordinated corrective maintenance. సమాధానం: C.