Automatic Colour Light Signalling Quiz
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Questions and Answers

What does a double yellow signal indicate for the driver?

  • To run through the signal
  • Pass via the loop line (correct)
  • To stop at the home signal
  • May stop at the main line starter (correct)

    • Which aspect requires inner distant DR to pick up a green indication?

  • When the inner distant signal displays yellow
  • When the home signal displays yellow
  • When the inner distant signal is off
  • When the home signal displays green (correct)

    • Which of the following is not an advantage of knowing the signals ahead?

  • Elimination of all breaking distance requirements (correct)
  • Improved sectional average speed
  • Reduction of warning board usage
  • Increased confidence for the driver

    • What happens when the DG lamp fuses in the inner distant signal?

    <p>The signal defaults to double yellow</p> Signup and view all the answers

    What is the purpose of having the inner distant signal controlled directly by the home signal?

    <p>To synchronize signal aspects for effective communication</p> Signup and view all the answers

    What is the primary current rating for the L-type transformer described?

    <p>300 mA</p> Signup and view all the answers

    What happens to the ECR if the signal lamp is burned out?

    <p>The ECR drops</p> Signup and view all the answers

    Which type of transformer is suitable for high current applications?

    <p>H-type transformer</p> Signup and view all the answers

    What voltage is developed across the secondary side of the H-type transformer?

    <p>9 V</p> Signup and view all the answers

    What is the capacity of the H-type transformer?

    <p>0.09 VA</p> Signup and view all the answers

    Which component is connected across the secondary of the L-type current transformer?

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

    What is the power rating of the L-type transformer indicated in VA?

    <p>40 VA</p> Signup and view all the answers

    What indicates that the signal lamp is functioning as per the ECR mechanism?

    <p>Lamp glowing</p> Signup and view all the answers

    Which of the following voltage signals would be observed if the signal lamps are both functioning properly?

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

    Which relay condition corresponds to the aspect HHG?

    <p>HR  + HHR  + DR </p> Signup and view all the answers

    What is the main purpose of repeating signal aspects in the cabin?

    <p>To inform operators of both manual and automatic signal states</p> Signup and view all the answers

    Which aspect corresponds to the relay condition HR  + HHR  + DR ?

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

    What is the typical arrangement for signal repeated indicators used in lever-controlled signals?

    <p>A single unit with additional units bolted on</p> Signup and view all the answers

    Which of the following is NOT a relay condition for the four-aspect control table?

    <p>HR  + HHR  + DR </p> Signup and view all the answers

    What color glass is commonly used in the dome for signal repeating?

    <p>Colored corresponding to the signal aspect</p> Signup and view all the answers

    How many units can be bolted to the top of the cabin indicator for multi-aspect signaling?

    <p>Two to four units</p> Signup and view all the answers

    What is the primary function of the MECR in the circuit?

    <p>To indicate the status of the main filament</p> Signup and view all the answers

    When does the MECR drop its connection?

    <p>When the main filament is fused</p> Signup and view all the answers

    What additional component is included in series with the MECR's back contact?

    <p>A 1 Ohm, 15 W resistor</p> Signup and view all the answers

    What does the down position of S1 MECR indicate?

    <p>The main filament is fused</p> Signup and view all the answers

    What problem may arise due to conductor shortages in existing installations?

    <p>Inability to provide individual signal indications</p> Signup and view all the answers

    What ensures the MECR does not give a false indication during aspect changes?

    <p>Slow release mechanism</p> Signup and view all the answers

    How does the auxiliary filament remain powered?

    <p>Only when the MECR drops</p> Signup and view all the answers

    Which component rectifies the output voltage from the transformer?

    <p>Rectifier circuit</p> Signup and view all the answers

    What is the purpose of the triple pole lamp in this context?

    <p>To manage multiple signaling aspects</p> Signup and view all the answers

    What happens when the aspect is switched ON?

    <p>The main filament is energized first</p> Signup and view all the answers

    What is the voltage ratio indicated in the content?

    <p>0.3 V / 9 V</p> Signup and view all the answers

    What does the ECR control when the signal lamp is glowing?

    <p>The concerned ECR picks up</p> Signup and view all the answers

    What happens to the ECR when the signal lamp is fused?

    <p>The ECR drops</p> Signup and view all the answers

    Which component provides the output signal to the cabin?

    <p>ECPRs contacts</p> Signup and view all the answers

    What is one advantage of the ECR methods mentioned?

    <p>Reduced line voltage drop</p> Signup and view all the answers

    Which relay is indicated to pick up in the cabin when the signal lamp is activated?

    <p>Repeater relay</p> Signup and view all the answers

    In the rectifier, what is the purpose of the lamp checking relay (ECR)?

    <p>To monitor signal lamp status</p> Signup and view all the answers

    What is the function of the signal lamp in the ECR system?

    <p>To signal conditions of the ECR</p> Signup and view all the answers

    What voltage and power specification is connected in the relay room as per the content?

    <p>110V/12V, 40 VA</p> Signup and view all the answers

    Which component is not mentioned as part of the ECR configuration?

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

    Study Notes

    Automatic Colour Light Signalling

    • Automatic block working controls train movement using automatic stop signals.
    • Signals operate automatically based on train passage through sections.
    • A line is track-circuited throughout, divided into sections governed by automatic stop signals.
    • Train movement is controlled by signals operating automatically.
    • No automatic signal shows 'OFF' until the line is clear beyond the signal.

    Adequate Distance/Overlap

    • Minimum overlap distance is 120 meters unless specified otherwise.
    • First paragraph of essentials requires entire track to be track-circuited and divided into sections for automatic block work.

    Automatic Stop Signal

    • Automatic stop signals are either 3-aspect or 4-aspect.
    • Signals are numbered sequentially (odd for one direction, even for the other) for up and down lines.
    • Numbering often relates to kilometer markers and traction pole location.
    • Numbering system can be complex, using code letters to denote local vs. through traffic and destinations.

    Track Circuits

    • Arrangement numbering follows overlap and berth track principles.
    • Overlap track length is usually 120 meters.
    • Tracks might be either DC, neutral/polarized or AC systems, potentially one/two rail depending on the design and traction (25 KV AC and/ or 50 Hz AC system).
    • Electronic track circuits (e.g. Jeumont) can support AC/DC systems with impedance bonds and are suitable for mixed traction systems.
    • Track circuits within an automatic signaling section carry a number corresponding to the governing automatic signal.
    • Section identification (e.g. A, B, C) is sometimes applicable for naming berth tracks within a section.

    Automatic Signal Control Circuits

    • Three/Four-aspect signal control circuits (using relays) are described by block diagrams and tables.
    • Sequences of aspect changes for different traffic scenarios (e.g., one, two, or three sections ahead clear) are explained with signal changes.

    Red Lamp Protection

    • The cascading arrangement is a circuit design that restores the signal to a more restrictive aspect in the event of specific lamp failure, typically to a more restrictive aspect (danger).

    Signal Tubular Post & Base

    • Signal post is a tubular design, varying in diameter and height.
    • The base is made of cast iron with a specific diameter and height.
    • Concrete foundations for signal posts are required, in a 1:3:6 cement to sand to aggregate ratio.
    • Stone ballast is often used in foundation.
    • Signal posts feature ladders/mounting for maintenance that are positioned within required spacing.

    Schedule of Maintenance

    • A maintenance schedule detailing checks for lenses, housings, lamps, voltage, and adjustments is outlined for signal components.

    DOs and DON'Ts

    • A list of recommended practices and actions that should be undertaken, and practices that should be avoided, relating to signal handling and repairs.

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    Description

    Test your knowledge on automatic colour light signalling systems used in railways. This quiz covers aspects such as train movement control, signal functionality, and distance requirements for effective operation. Prepare to dive into the detailed world of railway signaling!

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