Automatic Colour Light Signalling Quiz

A table that outlines the possible signal aspects based on the combination of relay conditions. Each row corresponds to a distinct signal aspect and is defined by conditions like Home Relay (HR), HHR, and Direction Relay (DR).

An aspect indicating that the train is allowed to proceed at the home signal with a restricted speed, typically 40 kmph.

An aspect indicating that the train is allowed to proceed at the home signal with a danger signal displayed at the next signal, meaning that there is a train ahead.

An aspect indicating that the train is allowed to proceed at the home signal but must stop at the next signal.

An aspect indicating that the train must stop at the home signal.

A system where the signal's aspect is displayed in the driver's cabin, providing visual confirmation of the current signal condition.

A type of signal indication used in lever-controlled signals where a single unit is used for 'ON' indication, while other units are added for 'OFF' indication.

A type of transformer used in signal circuits to detect a lamp's status. When the signal lamp is lit, the ECR relay picks up; when the lamp is off, the ECR drops. This indicates the signal lamp's condition via its contacts.

A type of transformer commonly used in signaling circuits to detect a lamp's status.

Indicates that a signal lamp is burning by energizing the ECR relay.

Indicates that a signal lamp is not burning (possibly fused or not glowing).

Another type of transformer used in signaling circuits. It's suitable for higher currents and has a capacity of 0.09 VA.

The main part of the signal circuit, responsible for transmitting the signal. It's typically connected to the secondary of the L-type transformer.

The secondary side of the H-type transformer, which generates a voltage (typically 9V) proportional to the current in the primary side.

The main part of the signal circuit, responsible for receiving and transmitting information about the lamp's status.

A device used to convert AC current to DC current.

This type of signal is located far from the home signal, typically 2 km away, to give drivers advanced warning of the upcoming signal conditions.

The signal closest to the track that directly controls the train's movement.

An aspect displayed by the distant signal indicating a possible stop at the upcoming home signal.

An aspect displayed by the home signal indicating that the train must stop at the signal.

An inner distant signal is located closer compared to a regular distant signal, but it's still positioned before the home signal.

A type of relay used to monitor a signal lamp's status, commonly used in railway signaling systems.

A component that transforms high voltage currents into low-voltage currents, enabling safe monitoring of signal lamp status.

A type of relay that is located in the cabin and receives information from the ECR, indicating the signal lamp's status.

When the signal lamp is lit, the ECR relay is energized (picked up), and the repeater relay in the cabin also becomes energized.

When the signal lamp is fused or not glowing, the ECR relay loses power (drops), and the repeater relay in the cabin also loses power.

The process of using electric relays (ECRs) and repeater relays to relay information about the status of signal lamps from the relay room to the cabin.

The main advantage of using the ECR method is that it reduces voltage drop along the transmission line, ensuring reliable signal transmission.

The signal lamps in the cabin are connected to the contacts of the repeater relays, providing visual indication of the lamp's status.

The primary role of ECR and its repeater relay is to reliably convey information about the status of signal lamps from the relay room to the cabin, ensuring safety and efficient operation.

A type of relay used in railway signaling to monitor the main filament of a triple pole lamp. It energizes when the main filament is lit and de-energizes when the filament fuses.

A type of lamp used in railway signaling that has three filaments. Two filaments are used for providing different aspects (e.g., red, yellow, green) and the third filament is used as a backup.

The primary filament in the triple pole lamp, responsible for producing the signal aspect.

A backup filament in the triple pole lamp, which is lit when the main filament is fused. This ensures that some indication is still given, even if the main filament fails.

A resistor used in the auxiliary filament circuit to limit the current and prevent damage to the filament during startup. It ensures that the main filament is first energized when the signal is switched ON.

The mechanism responsible for changing the signal aspect (e.g., red, yellow, green). It switches between the different filaments of the triple pole lamp.

A type of relay designed for slow release, commonly used in MECRs. It prevents accidental signal changes during aspect transitions when the main filament is fused.

The indication provided by the MECR relay when the main filament is fused, signifying a failure in the signal lamp.

A practice adopted to address limitations in conductors, where multiple signals are grouped together and a single indication is provided for maintenance.

A type of MECR used specifically for individual signal indication, requiring additional conductors to be installed.