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Questions and Answers
What is the primary function of the auxiliary filament in a triple pole lamp?
What is the primary function of the auxiliary filament in a triple pole lamp?
The auxiliary filament serves as a standby. It is designed to light up when the main filament fuses, ensuring that the signal remains visible.
Which of the following is NOT a component of a typical multiple unit colour light signal?
Which of the following is NOT a component of a typical multiple unit colour light signal?
What is the purpose of the 'cutting-in' arrangement in signal lamp circuitry?
What is the purpose of the 'cutting-in' arrangement in signal lamp circuitry?
The 'cutting-in' arrangement ensures that a more restrictive aspect is displayed if a lamp fails.
Which signals are responsible for warning train drivers of approaching stop signals in a MACLS system?
Which signals are responsible for warning train drivers of approaching stop signals in a MACLS system?
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What is the main advantage of LED signal units compared to conventional filament lamps?
What is the main advantage of LED signal units compared to conventional filament lamps?
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In a typical color light signal, the red aspect is placed at the highest position, while the green aspect is at the lowest position.
In a typical color light signal, the red aspect is placed at the highest position, while the green aspect is at the lowest position.
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Which of the following methods is used for signal indication in lever-controlled signals?
Which of the following methods is used for signal indication in lever-controlled signals?
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What is the purpose of the 'Overlap' in automatic block signalling?
What is the purpose of the 'Overlap' in automatic block signalling?
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The 'Berth track' in automatic block signalling is the portion of the track between two successive signals.
The 'Berth track' in automatic block signalling is the portion of the track between two successive signals.
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Which type of track circuits are suitable for use in areas with DC traction systems?
Which type of track circuits are suitable for use in areas with DC traction systems?
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Explain how the automatic signal control circuit of three consecutive sections works in a typical automatic block signalling system.
Explain how the automatic signal control circuit of three consecutive sections works in a typical automatic block signalling system.
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Study Notes
Automatic Colour Light Signalling
- Automatic block working controls train movement using automatic stop signals
- Signals operate automatically as trains enter and leave sections
- Essential components include track circuiting, automatic stop signals, and signalling sections
- Adequacy of overlap distance is crucial for safety and speed
- Minimal overlap distance is 120 meters unless otherwise specified
Signal Aspect Control Circuits
- Control relays (HR, DR, HHR) govern signal aspects, responding to various conditions in the system
- Different aspects (Red, Yellow, Double Yellow, Green) are controlled by specific relay combinations and conditions
- Different types of circuits exist for various signaling needs. These circuits include stop signal, distant signal, and permissive signal circuits.
- The table lists possible states for the circuits
- The circuits determine the aspect displayed
LED Signal Units
- LED signals offer extended lifespan and reduced maintenance compared to filament-based signals
- LED-based signals are solid-state, using semiconductors to emit light
- Color and aspect changes are controlled by electrical circuits, with multiple LEDs arranged so single LED failure does not disable entire signal
- The current-regulating unit in LEDs is vital
Signal Tubular Post and Base
- Signal posts have specific dimensions and materials (metal, concrete)
- Posts may need additional components like ladders and bases, depending on the location
- Signal aspects display visually and can be altered for specific situations, like crossed bars when not in use
Maintenance Schedule
- Specific actions like checking the cleanliness of lenses, housing and lamps are required regularly
- Inspections and lamp replacements are essential parts of maintaining the correct functioning of the system
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Description
Explore the intricacies of automatic colour light signalling systems in train operations. Understand how automatic stop signals and control circuits regulate train movement and ensure safety. This quiz will cover essential components like track circuiting and LED signal units.
