Untitled Quiz
40 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the frequency of recording on routes having a speed above 110 kmph and up to 130 kmph?

  • Once in 12 months
  • Once in 6 months (correct)
  • Once in 9 months
  • Once in 3 months

    • What is the threshold value of vertical acceleration for Loco Cab floor?

  • 0.10 g
  • 0.25 g
  • 0.15 g
  • 0.20 g (correct)

    • On which routes is the frequency of recording once in 4 months?

  • Routes having speed above 160 kmph
  • Routes having speed above 130 kmph and up to 160 kmph (correct)
  • Routes having speed above 110 kmph and up to 130 kmph
  • Routes having speed above 100 kmph and up to 110 kmph

    • What is the threshold value of lateral acceleration for Passenger Coach Floor?

    <p>0.15 g</p> Signup and view all the answers

    What is analyzed in Oscillograph Car results?

    <p>Vertical and lateral accelerations</p> Signup and view all the answers

    What should be done at locations with peaks above threshold values?

    <p>The track should be attended to</p> Signup and view all the answers

    What is the purpose of Oscillograph Car recordings?

    <p>To check the condition of the track</p> Signup and view all the answers

    What is an 'active patch' as per Oscillograph Results?

    <p>A section of track with excessive oscillations</p> Signup and view all the answers

    What action should be taken when a spot/block exceeds track parameter limits and acceleration peak limits set as UML?

    <p>Immediate speed restrictions should be imposed</p> Signup and view all the answers

    When should speed restrictions imposed due to UML exceedance be relaxed?

    <p>After suitable attention/maintenance of track at concerned location</p> Signup and view all the answers

    What should be done with blocks requiring Need Based Maintenance based on laid down SD based NBML?

    <p>They should be attended within a reasonable time</p> Signup and view all the answers

    What should be done with isolated spots identified using offline software or through TMS?

    <p>They should be attended within a reasonable time</p> Signup and view all the answers

    What is the gap within which two successive NBML locations in block sections/yards should be tamped?

    <p>200 m</p> Signup and view all the answers

    What should be done while attending an NBML block in a yard with a turnout?

    <p>The entire turnout should be tamped</p> Signup and view all the answers

    What is the basis for identifying blocks requiring Need Based Maintenance?

    <p>Both SD based NBML and Peak based NBML</p> Signup and view all the answers

    What factors should officials responsible for maintenance consider while planning deployment of maintenance resources?

    <p>Both magnitude of defects, cause of the defect, and traffic density, maximum permissible speed</p> Signup and view all the answers

    According to the Track Quality characterization, which of the following indices are computed for each block of 200 m?

    <p>Both Unevenness Index and Alignment Index</p> Signup and view all the answers

    What is the length of the short chord for calculating ALI1?

    <p>9.0 metre</p> Signup and view all the answers

    What is the formula for calculating Alignment Index on short chord (ALI1)?

    <p>((SD - (SDNTL - ALL - 1)) - ((1.3 × SDM - ALL - 1)))</p> Signup and view all the answers

    What is the purpose of maintenance units as per Para 523?

    <p>To take action for maintenance</p> Signup and view all the answers

    What is the formula for calculating Unevenness Index on short chord (UNI1)?

    <p>((SD - (SDNTL - UN - 1)) - ((1.3 × SDM - UN - 1)))</p> Signup and view all the answers

    What is the length of the long chord for calculating ALI2?

    <p>15.0 metre</p> Signup and view all the answers

    What is the purpose of calculating Alignment Index and Unevenness Index?

    <p>To compute the Track Quality</p> Signup and view all the answers

    What is the block length for which the Track Quality indices are computed?

    <p>200 m</p> Signup and view all the answers

    What is the need-based maintenance limit for unevenness (UN-1) for speeds above 100 Kmph and up to 110 Kmph?

    <p>SD-3.8 mm</p> Signup and view all the answers

    What is the planned maintenance limit for alignment (AL-2) for speeds above 100 Kmph and up to 110 Kmph?

    <p>SD-4.1 mm</p> Signup and view all the answers

    What is the urgent maintenance limit for gauge (mean gauge over 200 m section) in a straight section for speeds above 100 Kmph and up to 110 Kmph?

    <p>-10 mm to +12 mm</p> Signup and view all the answers

    What is the need-based maintenance limit for twist (TW-1) for speeds above 100 Kmph and up to 110 Kmph?

    <p>7 mm/m</p> Signup and view all the answers

    What is the planned maintenance limit for unevenness (UN-2) for speeds above 100 Kmph and up to 110 Kmph?

    <p>SD-5.4 mm</p> Signup and view all the answers

    What is the urgent maintenance limit for gauge (isolated defects) in a curve with a radius less than 440 m for speeds above 100 Kmph and up to 110 Kmph?

    <p>-7 mm to +20 mm</p> Signup and view all the answers

    What is the vertical and lateral acceleration peak for speeds above 100 Kmph and up to 110 Kmph?

    <p>0.30 g</p> Signup and view all the answers

    What is the planned maintenance limit for alignment (AL-1) for speeds above 100 Kmph and up to 110 Kmph?

    <p>SD-2.5 mm</p> Signup and view all the answers

    What is the speed in kmph at location 146/1-2?

    <p>100</p> Signup and view all the answers

    What is the type of location at 149/7-8?

    <p>Br</p> Signup and view all the answers

    What is the total length of the section in km?

    <p>232 km</p> Signup and view all the answers

    What is the vertical acceleration g at location 149/7-8?

    <p>0.35</p> Signup and view all the answers

    What is the date of recording in Statement 'B'?

    <p>22nd March 2018</p> Signup and view all the answers

    What is the lateral acceleration g at location 151/8-9?

    <p>0.24</p> Signup and view all the answers

    What is the section of the track in Statement 'B'?

    <p>BPQ—KZJ (km 367- km 135)</p> Signup and view all the answers

    What is the speed in kmph at location 160/7-8?

    <p>110</p> Signup and view all the answers

    Study Notes

    Track Quality Parameter Indices

    • Parameter indices are computed for each block of 200 meters to characterize track quality.
    • Two types of indices are used: Unevenness Index (UNI) and Alignment Index (ALI).
    • UNI and ALI are calculated on both short and long chords.

    Alignment Index (ALI)

    • Calculated using the formula: ALI = 100 × e × (SD - ((SDNTL - ALL - 1) - ((1.3 × SDM - ALL - 1)))
    • ALI is calculated for both short and long chords (ALI1 and ALI2).

    Unevenness Index (UNI)

    • Calculated using the formula: UNI = 100 × e × (SD - ((SDNTL - UN - 1) - ((1.3 × SDM - AUN - 1)))
    • UNI is calculated for both short and long chords (UNI1 and UNI2).

    Maintenance

    • Maintenance units should take action according to the maintenance schedule outlined in Para 523.
    • Frequency of recording depends on route speed:
      • Above 110 kmph and up to 130 kmph: once in 6 months.
      • Above 130 kmph and up to 160 kmph: once in 4 months.

    Analysis of Oscillograph Car Results

    • Vertical and lateral accelerations above threshold values are separately counted.
    • Threshold values are:
      • Loco Cab floor: 0.20 g in vertical and lateral modes, and 0.30 g for locos with single stage suspension.
      • Passenger Coach Floor: 0.15 g in vertical and lateral modes.

    Reports and Interpretation of Results

    • Results are given in Annexure 5/1 under the following heads:
      • Station Yards
      • Other than Station Yards (Isolated locations)
      • Active continuous stretches

    Use of Oscillograph Car Recordings

    • Threshold values of acceleration are used to attend to track defects and ensure good riding quality.
    • Efforts should be made to find out if defects are occurring in an active patch, which may lead to excessive oscillations.
    • For speeds above 100 kmph and up to 110 kmph, planned maintenance limits and need-based maintenance limits are outlined.
    • Unevenness, alignment, and gauge parameters have specific limits and thresholds for maintenance.

    Action to be Taken Based on TRC Results

    • Action to be taken on exceedance of UML:
      • Spots/blocks exceeding track parameter limits should be noted, and speed restrictions should be imposed.
      • Suitable attention/maintenance should be carried out to relax speed restrictions.
    • Action to be taken on exceedance of NBML:
      • Identify blocks requiring need-based maintenance using offline software or TMS.
      • Attend to these blocks and isolated spots within a reasonable time to maintain good ride quality.

    Oscillograph Results

    • Statement 'B' outlines the results in places other than station yards.
    • Statement 'C' outlines the results in yards.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Track Monitoring & Tolerances PDF

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser