Signalling Systems Quiz
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Questions and Answers

What is the voltage rating for the multi-aspect colour light signal SL 30?

  • 1.2 volts
  • 12 volts
  • 110 volts
  • 24 volts (correct)

Which signalling lamp type is associated with a rating of 6 volts and 1.2 watts?

  • SL 18
  • SL 30
  • SL 33
  • SL 13 (correct)

What is the wattage rating of the SL 33 position light junction?

  • 25 watts (correct)
  • 24 watts
  • 12 watts
  • 110 watts

Which type of signalling lamp has a recommended voltage of 12 volts?

<p>SL 18 (C)</p> Signup and view all the answers

What is the purpose of the SL 30 signalling lamp?

<p>Illuminated diagrams and control panels (D)</p> Signup and view all the answers

What is the minimum capacity of the signal transformer?

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

What does the % Regulation measure in relation to the transformer?

<p>The difference between no load and full load voltage (A)</p> Signup and view all the answers

Which type of transformer has tapping on the secondary winding?

<p>IRS type (D)</p> Signup and view all the answers

What is the maximum allowable % Regulation measured on the secondary side?

<p>15% (C)</p> Signup and view all the answers

What should the insulation resistance measure at minimum?

<p>100 MΩ (B)</p> Signup and view all the answers

What type of signal control must always be in place in CLS?

<p>Signal Control Relay (B)</p> Signup and view all the answers

Which voltage is mentioned as nominal at 'No Load' for the signal transformer?

<p>110 V (D)</p> Signup and view all the answers

What is the frequency rating of the signal transformer?

<p>50 Hz (B)</p> Signup and view all the answers

What condition must be true for HHR to pick up in the first method of the Four-Aspect Colour Light Signal Control Circuit?

<p>The signal in advance displays a Yellow aspect (B)</p> Signup and view all the answers

In the context of the Four-Aspect Colour Light Signal Control, what does DR respond to?

<p>Only when the signal displays Double Yellow or Green aspect (B)</p> Signup and view all the answers

When HR is energized in the Four-Aspect Colour Light Signal Control Circuit, what happens to the Yellow lamp?

<p>It remains in the circuit to maintain a Double Yellow aspect (A)</p> Signup and view all the answers

Which of the following statements regarding the Three-Aspect Control Table is true?

<p>HHG occurs with HHR increasing and DR decreasing (C)</p> Signup and view all the answers

What aspect is displayed when only DR is decreased according to the Three-Aspect Control Table?

<p>HG (C)</p> Signup and view all the answers

What is the purpose of using a separate side light lamp and optical system for sidelights?

<p>To prevent phantom indications in the main lens (C)</p> Signup and view all the answers

What is the lamp rating for SL 5 suggested in the content?

<p>12 V / 4 W (D)</p> Signup and view all the answers

How does the deflecting prism affect the main beam of light?

<p>It directs part of the light at an angle of 350 degrees (C)</p> Signup and view all the answers

What distinguishes the double lens unit for long-range signals from that for short-range signals?

<p>The diameter of the outer lens (B)</p> Signup and view all the answers

What is the visibility range for short-range colour light signals?

<p>Not less than 350 m (A)</p> Signup and view all the answers

What is the focal length of the outer lens in the double lens unit for long-range signals?

<p>4 inches (A)</p> Signup and view all the answers

What type of lens is the inner colored lens described as?

<p>Stepped lens (B)</p> Signup and view all the answers

How does the design of the lenses help with the beam of light?

<p>They throw a parallel beam of lights of high intensity (C)</p> Signup and view all the answers

What is one advantage of colour light signals mentioned in the content?

<p>Displays aspects at driver's eye level (A)</p> Signup and view all the answers

Which disadvantage of colour light signals relates to visual hazards at night?

<p>Glare at night (B)</p> Signup and view all the answers

What materials are mentioned for the construction of the multiple unit colour light signal?

<p>Cast aluminium and sheet metal (D)</p> Signup and view all the answers

In a 3-unit type multiple unit colour light signal, which colour is positioned at the top?

<p>Green (D)</p> Signup and view all the answers

What feature is included to protect the light unit lens from sunlight?

<p>Hood (A)</p> Signup and view all the answers

What is the function of the compartment located below the units in the multiple unit colour light signal?

<p>For cable termination and internal connections (A)</p> Signup and view all the answers

What locking mechanism is used for securing the light units?

<p>Universal locks (B)</p> Signup and view all the answers

What is one disadvantage of colour light signals related to their visibility?

<p>Limited visibility on curves (C)</p> Signup and view all the answers

What does a double yellow home signal indicate?

<p>May stop at main line starter (A), To stop at loop starter (C)</p> Signup and view all the answers

Which signal aspect is displayed when the inner distant signal's pickup is activated by a green home signal?

<p>Green (B)</p> Signup and view all the answers

What are the advantages of the signaling system described?

<p>Goods warning board is not needed (B)</p> Signup and view all the answers

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

<p>It shows a double yellow aspect (A)</p> Signup and view all the answers

When the inner distant HHR picks up, which signal aspect is displayed?

<p>Double yellow (A)</p> Signup and view all the answers

What is the function of the home signal in relation to the inner distant signals?

<p>Directly controls the aspects displayed by the inner distant signals (C)</p> Signup and view all the answers

Which option does NOT describe a benefit of the signaling system?

<p>Reduced braking distance (B)</p> Signup and view all the answers

What is the indication for a green home signal?

<p>To run through without stopping (C)</p> Signup and view all the answers

Flashcards

Multiple Unit Colour Light Signal

In this type, each aspect of the signal (green, yellow, red) has its own separate light unit.

Aspect

The different colored lights in a signal (e.g., green, yellow, red), each representing a specific indication.

Range of Operation

The distance at which a signal can be clearly seen.

Speed of Operation

The speed with which a signal changes from one aspect to another.

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Arrangement of Light Units in a 3-Aspect Signal

The light units are usually arranged vertically, with green at the top, yellow in the middle, and red at the bottom.

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Hood

A protective cover over each light unit to prevent direct sunlight from affecting the lens.

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Cable Termination Box

A space below the light units containing two terminal blocks for connecting cables and internal circuitry.

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Mounting Socket

It refers to the material used for the signal's base or mounting frame, such as cast aluminium, sheet metal, or fibre reinforced plastic.

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Side light lamp

A specialized lamp that provides a beam of light angled from the main signal to enhance driver visibility, especially for locomotive crews.

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Route Indicator

A type of signaling lamp designed for indicating the direction of train movement.

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Multi-Aspect Colour Light Signal

A signaling lamp with multiple aspects (lights) for indicating different signal instructions.

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Stepped lens

A lens with a stepped or curved surface designed to direct and focus a beam of light. It is often used in conjunction with other lenses to create a concentrated beam of light.

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Plane/clear lens

A transparent lens that allows all wavelengths of light to pass through, used in conjunction with a colored lens to create a specific signal color.

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Rating (Watts)

This refers to how many watts of power a signal lamp consumes, indicating its brightness.

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Deflecting prism

A lens designed to direct a beam of light at an angle, often used to create a subsidiary beam or a side light effect.

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B.S. Specification No.469

A standard set of specifications for signaling lamps in the United Kingdom.

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Colored lens

A lens used to create a specific signal color in a multi-unit signal system.

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V or Bow Filament

A type of filament used in signaling lamps that generates light in a specific color.

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Focal length

The distance from a lens to the point where light rays converge and form a focused image.

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Long-range signals

Signal systems designed to provide a clear view for long distances.

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Short-range signals

Signal systems designed for shorter distances.

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Signal Transformer

A device that transforms the 110V AC power supply into a lower voltage for the signal circuitry.

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Voltage Regulation

The difference between no-load voltage and full-load voltage of a transformer, expressed as a percentage.

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Transformer Capacity

This refers to the ability of a transformer to maintain a consistent output voltage despite changes in load.

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Minimum Capacity

The minimum amount of power the transformer can provide continuously without failing.

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No Load Current

The current drawn by the transformer when there is no load connected.

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110 VAC Feed System

The standard voltage used to power color light signals. It's now the preferred voltage.

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Signal Control Relay

A relay that ensures a signal aspect is only activated when the related control circuitry is energized.

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Three-Aspect Control Table

A type of signaling circuit where the signal aspect is controlled by the combination of two relays (HHR and DR), producing three different aspects based on the state of these relays.

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Colour Light Signal

A signaling system where the signal aspect is determined by the presence or absence of specific colored lights.

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Permissive Signal

A signaling method where the signal in advance displays the next aspect that will be displayed at the current signal.

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Four-Aspect Colour Light Signal

A type of signaling system where the signal displays four different aspects: green, yellow, double yellow, and red.

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Distant Signal

A signal that appears at least 2 kilometers before a home signal, giving the driver early warning of upcoming conditions.

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Inner Distant Signal

A signal located close to the home signal, controlling the driver's actions immediately before the home signal.

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Green Aspect

A green light indication on a colour light signal, allowing the driver to proceed at the designated speed.

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Yellow Aspect

A yellow light indication on a colour light signal, warning the driver to prepare to stop, reduce speed, or obey other instructions.

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Red Aspect

A red light indication on a colour light signal, indicating a complete stop.

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Study Notes

Automatic Colour Light Signalling

  • Automatic block working controls train movement via automatic stop signals.
  • These signals operate automatically as trains enter and exit sections.
  • Sections are track-circuited and controlled by automatic stop signals.

Adequate Distance/Overlap

  • A minimum of 120 meters overlap is required between signalling sections.
  • This prevents signals from becoming blank and ensures section/train safety.

Automatic Stop Signals

  • Signalling is numbered, either odd or even, to identify the location.
  • Numbers are also assigned referencing the km marker and signal location.
  • The numbering method simplifies signal identification for maintenance personnel.

Track Circuits

  • Track circuits are essential for automatic operation.
  • Their layout and aspect control are designed according to specific railway guidelines.
  • Circuit configurations depend on local conditions (e.g., types of electric traction).

Red Lamp Protection

  • A circuit is needed to prevent blank signals if the red lamp fails.
  • This method involves using additional relays (such as 3GECPR & 3 RECR).
  • The relays act to safeguard signalling when the red lamp is out and the signal is not blank.

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Related Documents

S 10 Colour Light and Automatic Signalling PDF

Description

Test your knowledge on signalling systems, including voltage ratings, wattage, and transformer specifications associated with multi-aspect colour light signals. This quiz covers various aspects of signal lamps and control circuits, including their purposes and operational conditions.

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