Comparative Performance of Indian Locomotives
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Questions and Answers

Which locomotive has the highest horsepower output?

  • WAP4
  • WAP1
  • WAP5
  • WAG9 (correct)

    • What is the maximum service speed of the WAP5 locomotive?

  • 160 km/h (correct)
  • 130 km/h
  • 135 km/h
  • 140 km/h

    • Which locomotive can carry the most coaches at a speed of 130 km/h?

  • WAP5 (correct)
  • WAP4
  • WAP6
  • WAP3

    • What is the axle load of WAP4?

    <p>19.0 t</p> Signup and view all the answers

    Which locomotive has the lowest continuous tractive effort at 72 km/h?

    <p>WAP1</p> Signup and view all the answers

    At what speed can WAP6 operate a maximum of 12 coaches on a 1/200 grade?

    <p>130 km/h</p> Signup and view all the answers

    Which locomotive has the highest continuous tractive effort at its rated speed?

    <p>WAP5</p> Signup and view all the answers

    What is the unsprung mass per axle for WAP5?

    <p>2.69 t</p> Signup and view all the answers

    Which locomotive can operate at the lowest continuous speed?

    <p>WAP5</p> Signup and view all the answers

    Which locomotive has the same horsepower as WAP3?

    <p>WAG5H</p> Signup and view all the answers

    How much can the total running time of the existing HWD-NDLS Rajdhani Express be reduced when run by a WAP5 loco at the existing booked speed?

    <p>30 minutes</p> Signup and view all the answers

    If the full speed potential of a WAP5 loco (booked speed of 150 km/h) is utilized for the HWH-NDLS Rajdhani Express, what is the total reduction in running time?

    <p>1 hour 15 minutes</p> Signup and view all the answers

    How many coaches can the HWH-NDLS Rajdhani Express theoretically enhance to while maintaining the existing total running time when hauled by a WAP5 loco?

    <p>29 coaches</p> Signup and view all the answers

    What is the power output of the WAP5 loco for supply to the coaches?

    <p>850 kVA at 750 V</p> Signup and view all the answers

    By how much can the running time of the existing 9-coach Shatabdi Express be reduced if hauled by a WAP5 loco with enhanced booked speed?

    <p>12 minutes</p> Signup and view all the answers

    What is the total number of additional coaches that can be added to the existing 9-coach NDLS-BPL Shatabdi Express at existing booked speed without affecting total running time?

    <p>5 coaches</p> Signup and view all the answers

    What is the maximum tractive effort (T.E) of the WAG9 locomotive?

    <p>46.9 t</p> Signup and view all the answers

    Which axle load is associated with a speed of 51.1 km/h?

    <p>21.0 t</p> Signup and view all the answers

    Which of the following best describes a primary operational advantage of the WAP5 loco?

    <p>Reduced requirement for power cars</p> Signup and view all the answers

    For a balancing speed with a 4700t BOXN load at level grade, how many locomotives are required to achieve a speed of greater than 100 km/h?

    <p>1 locomotive</p> Signup and view all the answers

    Which aspect is associated with the reliability of 3-phase locomotives compared to others?

    <p>Higher reliability</p> Signup and view all the answers

    For which gradient does the number of required locomotives for starting remain consistent across all types tested?

    <p>1 in 400</p> Signup and view all the answers

    What is the upsprung mass per axle for the locomotive with a maximum T.E of 45.0 t?

    <p>4.3 t</p> Signup and view all the answers

    What range of maximum electrical braking effort is noted at speeds between 27-36 km/h?

    <p>27-36 t</p> Signup and view all the answers

    At which speed is the axle load of 20.5 t recorded?

    <p>50.0 km/h</p> Signup and view all the answers

    Which of the following locomotives shows a distinct advantage in starting capability due to better adhesion?

    <p>WAG9</p> Signup and view all the answers

    What is the continuous tractive effort (Cont.T.E) of the locomotive associated with the speed of 44.0 km/h?

    <p>30.8 t</p> Signup and view all the answers

    Which condition prevents certain locomotives from hauling at a given speed on a 1 in 200 grade with a curvature of 2°?

    <p>Insufficient electrical braking effort</p> Signup and view all the answers

    What is the minimum upsprung mass per axle for any of the locomotives listed?

    <p>3.99 t</p> Signup and view all the answers

    What is a major advantage of the on-board fault diagnostics system in WAP5/WAG9 locomotives?

    <p>Reduces trouble-shooting time on the line</p> Signup and view all the answers

    What percentage of energy savings has been experienced with WAP5/WAG9 locomotives compared to conventional methods?

    <p>20-30%</p> Signup and view all the answers

    How does the power factor of 3-phase locomotives compare to conventional locomotives?

    <p>It operates at a near unity power factor</p> Signup and view all the answers

    What is the effect of improved power factor in context to conductor size?

    <p>Decreases the required conductor size</p> Signup and view all the answers

    What is the primary benefit of using PWM converter technology in locomotives?

    <p>Reduces harmonic interference</p> Signup and view all the answers

    What contributes to the lower maintenance requirement of 3-phase locomotives?

    <p>Absence of commutator and power contactors</p> Signup and view all the answers

    How does the unsprung mass of WAP5 locomotives compare to WAP4 locomotives?

    <p>WAP5 has a lower unsprung mass</p> Signup and view all the answers

    What benefit does a lower unsprung mass provide for WAP5 locomotives?

    <p>Enhances riding qualities and reduces track disturbance</p> Signup and view all the answers

    What effect does the use of an induction motor have in 3-phase locomotives?

    <p>Reduces the unsprung mass</p> Signup and view all the answers

    What is one of the main advantages of the lower maintenance of 3-phase locomotives?

    <p>Higher availability on line</p> Signup and view all the answers

    Which locomotive is capable of operating the highest number of coaches at a speed of 160 km/h?

    <p>WAP6</p> Signup and view all the answers

    What is the continuous tractive effort of the WAG9 locomotive at its rated speed of 73 km/h?

    <p>19.0 t</p> Signup and view all the answers

    Which locomotive exhibits the lowest maximum service speed?

    <p>WAP1</p> Signup and view all the answers

    Which of the following locomotives has a higher axle load than WAP5?

    <p>WAP4</p> Signup and view all the answers

    Which continuous speed is associated with the WAP3 locomotive?

    <p>72 km/h</p> Signup and view all the answers

    What is the maximum starting tractive effort (TE) of the WAP4 locomotive?

    <p>30.8 t</p> Signup and view all the answers

    Which locomotive has the highest continuous horsepower output at rail?

    <p>WAG9</p> Signup and view all the answers

    Which of the following locomotives has a lower unsprung mass per axle compared to WAP4?

    <p>WAP5</p> Signup and view all the answers

    What is the maximum speed potential of the WAG5H locomotive?

    <p>80 km/h</p> Signup and view all the answers

    Which locomotive is designed to handle 22 coaches at a speed of 130 km/h?

    <p>WAP3</p> Signup and view all the answers

    What effect does utilizing the full speed potential of the WAP5 loco have on the total running time of the HWH-NDLS Rajdhani Express?

    <p>Reduces it by about 1 hour and 15 minutes</p> Signup and view all the answers

    To which gradient does the table indicate the minimum number of locomotives required for starting is always 1 for a 4700 t BOXN?

    <p>1 in 400</p> Signup and view all the answers

    If the HWH-NDLS Rajdhani Express's running time is maintained at existing booked speed while using a WAP5 loco, what is the maximum number of coaches it can theoretically be enhanced to?

    <p>29 coaches</p> Signup and view all the answers

    What is one operational advantage of the WAP5 loco that reduces the need for power cars?

    <p>It provides 850 kVA at 750 V for coaches</p> Signup and view all the answers

    How many locomotives are required for starting on a 1 in 100 gradient for a 5055 t BOXN?

    <p>4 locomotives</p> Signup and view all the answers

    What is a characteristic of 3-phase locomotives in comparison to others?

    <p>They are known for higher reliability</p> Signup and view all the answers

    For starting a freight train with a grade of 1 in 70, how many locomotives are typically required for a 4700 t BOXN?

    <p>3 locomotives</p> Signup and view all the answers

    What is the impact of using a WAP5 loco on the running time of the existing 9-coach Shatabdi Express?

    <p>Reduces it by about 12 minutes</p> Signup and view all the answers

    What is a significant benefit realized from the WAP5's power factor?

    <p>Less energy is lost in transmission</p> Signup and view all the answers

    What is the theoretical effect of adding coaches to the NDLS-BPL Shatabdi Express while maintaining total running time?

    <p>It can hold up to 5 additional coaches</p> Signup and view all the answers

    What is a significant benefit of the on-board fault diagnostics system in WAP5/WAG9 locomotives?

    <p>Reduces troubleshooting time on line.</p> Signup and view all the answers

    How do WAP5/WAG9 locomotives contribute to energy savings?

    <p>By generating electrical power during braking.</p> Signup and view all the answers

    What is a consequence of the improved power factor in 3-phase locomotives?

    <p>More locomotives can be accommodated in the same feeding zone.</p> Signup and view all the answers

    What advantage does the PWM converter technique offer in 3-phase locomotives?

    <p>It minimizes harmonic interference compared to thyristor locos.</p> Signup and view all the answers

    What impact does the absence of commutators and power contactors have on 3-phase locomotives?

    <p>Much lower maintenance requirements and costs.</p> Signup and view all the answers

    In terms of unsprung mass, how do WAP5 locomotives compare with WAP4 locomotives?

    <p>WAP5 has a lower unsprung mass of 2.69 tonnes.</p> Signup and view all the answers

    What is one of the key benefits of utilizing an induction motor in 3-phase locomotives?

    <p>Lower unsprung mass contributing to better riding quality.</p> Signup and view all the answers

    What drawback can be minimized due to the improved power factor in 3-phase locomotives?

    <p>Penalties from power supply authorities.</p> Signup and view all the answers

    What is one of the primary advantages attributed to the operation of 3-phase locos at near unity power factor?

    <p>Reduction in rail wear due to more efficient energy use.</p> Signup and view all the answers

    How do the maintenance aspects of 3-phase locomotives influence their performance?

    <p>They allow for higher availability on the line.</p> Signup and view all the answers

    What is the continuous tractive effort (Cont.T.E) for a locomotive operating at a speed of 50.0 km/h?

    <p>27.0 t</p> Signup and view all the answers

    At what speed can a locomotive with a 21.0 t axle load maintain an operation on a level grade with only 1 locomotive?

    <p>87 km/h</p> Signup and view all the answers

    Which locomotive shows the highest maximum traction effort (T.E) listed?

    <p>46.9 t</p> Signup and view all the answers

    What is the minimum balancing speed for a freight train with a 4700t BOXN load required to operate on a 1 in 200 grade with a curvature of 2°?

    <p>42 km/h</p> Signup and view all the answers

    What is the maximum electrical braking effort at speeds between 27-36 km/h for the locomotives listed?

    <p>Between 27-36 km/h</p> Signup and view all the answers

    Which option indicates an axle load associated with the highest maximum tractive effort (T.E)?

    <p>22.0 t</p> Signup and view all the answers

    What is the upsprung mass per axle for the locomotives achieving a continuous tractive effort of 30.8 t?

    <p>4.3 t</p> Signup and view all the answers

    Which parameter contributes significantly to the starting capability of the WAG9 locomotive?

    <p>Higher starting tractive effort</p> Signup and view all the answers

    What speed is necessary to operate a locomotive with a 20.0 t axle load on a 1 in 200 grade with a 2° curvature?

    <p>82 km/h</p> Signup and view all the answers

    What is the maximum tractive effort observed for a freight locomotive operating at 44.0 km/h?

    <p>45.0 t</p> Signup and view all the answers

    Study Notes

    Comparative Operating Performance

    • WAP5 and WAG9 locomotives have superior speed and adhesive qualities compared to existing Indian locomotives.
    • Comparative performance data for WAP5 locomotives are detailed in Table 10.1.
    • Table 10.1 shows capacity on level and 1/200 grade for various types of locomotives, including the number of coaches and speed levels.
    • HP output, maximum service speed, continuous speed, axle load, unsprung mass per axle, and maximum starting/continuous tractive effort (TE) are provided for each locomotive type.

    Comparative Operating Performance Data (Freight Locomotives)

    • Table 10.2 gives comparative operating performance data for freight locomotives.
    • The table details continuous horsepower (HP), maximum speed potential, continuous speed, axle load, unsprung mass, maximum and continuous TE for WAG5H, WAG7, WAG7H, WAG6C, and WAG9 locomotives.
    • Electrical braking effort is detailed for a range of speeds in various units.
    • The table also shows balancing speed with 4700t BOXN load, grade, curvature, and number of locomotives for specific levels.

    Comparative Starting Capabilities of Freight Locomotives

    • Table 10.3 outlines the number of locomotives required to start freight trains based on different grades.
    • The table shows the number of various locomotives needed to start trains on different inclines for varying freight loads (4700t and 5055t BOXN).

    Highlights on Haulage Capabilities

    • Running time for existing HWD-NDLS Rajdhani Express could reduce by about 30 minutes if hauled by a WAP5 locomotive at booked speed.
    • Full speed potential (150 km/h) of a WAP5 locomotive could reduce running time by about 1 hour and 15 minutes.
    • If running time needs to remain constant, a WAP5 could potentially handle a 29-coach Rajdhani Express at existing booked speeds.
    • Running time for NDLS-JHS Shatabdi Express could reduce by 12 minutes with a WAP5 at enhanced speed (150 km/h).
    • Up to 5 coaches can be added to the NDLS-BPL Shatabdi Express without impacting running time using a WAP5.

    Operational Advantages

    • WAP5 locomotives can provide 850 kVA (1-phase) power to coaches, potentially reducing the need for power cars.
    • 3-phase locomotives generally have higher reliability, quicker fault diagnostics, and reduced on-line troubleshooting time.
    • Regenerative braking (returning electrical power to the overhead system) in 3-phase locomotives can save energy (20-30%) compared to other systems.
    • 3-phase locomotives operate at near-unity power factor, reducing power factor penalties and potentially requiring smaller overhead lines (OHE)

    Maintenance Aspects

    • 3-phase locomotives have lower maintenance costs and greater availability due to the absence of commutators and power contactors.
    • Lower unsprung mass in WAP5 locomotives (around 2.69 tonnes) compared to WAP4 (around 4.2 tonnes) results in better riding quality and reduced track wear/damage.

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    Comparative Operating Performance (PDF)

    Description

    Explore the performance metrics of WAP5 and WAG9 locomotives, including speed and adhesive qualities as compared to other Indian locomotives. The quiz includes detailed comparative data from tables outlining horsepower, axle load, and tractive effort for both passenger and freight locomotives.

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