Circuit Design and Control Panels

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Questions and Answers

What color light indicates that a stop signal is 'ON'?

Red (correct)

Green

White

Yellow

Which of the following statements about the indication of a signal 'OFF' is true?

It is indicated only by a white light.

It is never indicated by a flashing light.

It can be indicated by a combination of green, yellow, or double yellow lights. (correct)

It is always indicated by a red light.

Which indication is shown when there is a failure of the green light for a signal 'OFF' aspect?

Both green and red flash

Red flashes with no green

Green not lit and red flashing

Green flashes red (correct)

Which light indicates the 'ON' aspect of a shunt signal on an independent post?

Two miniature white lights in a horizontal position Signup and view all the answers

What is the indication for the 'OFF' aspect of a shunt signal located on the same post as a running signal?

Slanting white light strip Signup and view all the answers

How is a 'Calling on' signal indicated when it is 'OFF'?

White light below the running signal indicating symbol Signup and view all the answers

When should the starter indicator be lit according to the provided guidelines?

When the repeater of the signal shows 'OFF' aspect Signup and view all the answers

What action is indicated by a failure of the yellow light for a signal 'OFF' aspect?

Green flashes and red is lit Signup and view all the answers

What principle should the route setting installations follow?

Entry/Exit Signup and view all the answers

How many push buttons are required for controlling each route in installations of Route Setting type?

Two Signup and view all the answers

In the Non-route setting type installations, what is necessary to clear a signal after route setting?

Individual and group button Signup and view all the answers

What feature is provided for documenting individual operations of points during failures?

Counter Signup and view all the answers

Which switch/button color indicates a running signal?

Red Signup and view all the answers

What must be implemented to control slot operations?

Two buttons or a switch Signup and view all the answers

What condition allows for the selection of a desired overlap beyond the exit signal?

Route with more than one overlap Signup and view all the answers

Which color is assigned to the crank handle in the control panel arrangement?

Blue Signup and view all the answers

What must be true for the operation of entrance exit buttons to clear the signal?

The interlocking must be free. Signup and view all the answers

What is required for a complete route release including overlap?

The corresponding route switch must be operated. Signup and view all the answers

What is the function of the mid stroke point reversal feature in point control circuits?

To prevent operation when points are under operation. Signup and view all the answers

Which condition does NOT lead to the release of a route section?

Only the concerned track relay drops. Signup and view all the answers

Which statement describes the purpose of the Maintenance Terminal in an Electronic Interlocking system?

To allow for regular maintenance checks by technicians. Signup and view all the answers

How is the route release controlled when using a single track circuit?

After a predetermined time delay. Signup and view all the answers

What design feature must a route release circuit have regarding track circuits?

It must only release when at least two track circuits drop and pick-up in sequence. Signup and view all the answers

What principle is important for circuit design using electronic devices to ensure safety?

Component failure must be self-detecting. Signup and view all the answers

What should occur if there is a fault in fail-safe electronic equipment?

Open or short circuits should be recognized without impairing safety. Signup and view all the answers

In installations with more than 100 routes and a route setting system, what must occur for sectional route release?

Sub-route sections already released must allow setting of other routes. Signup and view all the answers

What is a necessary condition for automatic route release with sequence proving relays?

The train's authorized passage must be proven. Signup and view all the answers

How should fail-safe equipment be designed to avoid external interferences?

By adequate separation of terminals and protective shrouds. Signup and view all the answers

What is indicated when a signal is put back to 'ON'?

The route must be normalized using the route switch. Signup and view all the answers

Which aspect should be considered during the design and maintenance of electronic systems?

Stipulated guidelines need to be followed. Signup and view all the answers

What is a critical safety feature for circuits that experience open circuits?

They should not cause unsafe conditions. Signup and view all the answers

What is the role of block working in an Electronic Interlocking system?

It allows for line clear when the block section is clear. Signup and view all the answers

What is the purpose of the 'Extreme Emergency Key'?

To restore all signals to 'ON' aspect during an emergency. Signup and view all the answers

What happens after the 'Extreme Emergency Button' is pressed?

All CH/NX Keys will be free after a time delay. Signup and view all the answers

What feature is NOT required for purely internal circuits?

Double cutting or cross protection. Signup and view all the answers

What is required of the Control Terminal in Electronic Interlocking Installations?

It must be of appropriate size to display the yard layout. Signup and view all the answers

How should the Video Display indications on the Control Terminal conform?

They should conform to Control Panel indications and UFSBI Block panel. Signup and view all the answers

What is the expected function of the dropdown menus in controlling signals and points?

To enable operation through appropriate approved means. Signup and view all the answers

What type of protection should external circuits have?

They should be protected from cross connections and induced voltages. Signup and view all the answers

What is required for the release of the 'Extreme Emergency Key' operation?

A non-resettable counter must record each operation. Signup and view all the answers

What should be considered when choosing the type of interface for axle counters?

Type of Interface - Signal Cable, Quad cable, or OFC Signup and view all the answers

Which of the following is NOT specified for outdoor signals?

Route indicators must be digital display type Signup and view all the answers

What is the purpose of providing at least two cores of cable between two ends of a yard?

To support maintenance telephone communication Signup and view all the answers

Which of the following statements about point operating control circuits is true?

They include overload protection and cross protection Signup and view all the answers

What is emphasized for the cable installation in non RE areas?

Telephone communication must be provided for maintenance Signup and view all the answers

What type of signal lights are approved for 'A' & 'AG' markers for semi-automatic signals?

Approved type lights Signup and view all the answers

What is stipulated about the centralization of DC track relays?

They must be centralized in the location or relay room using separate adequately cross-sectioned cables Signup and view all the answers

Which type of axle counters is mentioned in the content?

SSDAC, HA-SSDAC, and MSDAC Signup and view all the answers

Study Notes

Circuit Design Criteria

Detailed designs may be required for route setting (entry/exit principle) or non-route setting (individual point operation).
Designs must meet RE stipulations in Chapter 22 (signalling in 25 KV AC electrified areas).
Designs must align with approved plans, control tables, control panel diagrams, and relay analysis/rack arrangements.
Designs should support specific equipment (distributed or central electronic interlocking, MSDAC, SSDAC, UFSBI, etc.) and interfacing features.
Use of dual OFC in distributed electronic interlocking is preferred.
Drawings and designs must comply with typical templates, RDSO standards, guidelines, industry best practices, and reliability/availability/maintenance/safety principles.

Control Panels

Control panel illuminated diagrams should be well-proportioned, and domino panels preferred where extra facilities are likely.
Track circuit areas should be clearly distinguished by colour.
Route switches/buttons, point switches, etc., should be shown on the illuminated diagram in geographical order. A separate diagram for indications and a console for all members may be provided.
Non-route setting installations allow individual point operation.
Route setting installations use the entry/exit principle, controlled by two push buttons (one at entry, one at exit) for each route.

Non-Route Setting Installations

After point setting is complete, signals can be cleared individually (with group button or single switch), or with one button at each end.
Individual push buttons (or 2-3 position switches) should be provided for individual point operation.
Routes with multiple overlaps allow selection/setting of the desired overlap beyond the exit signal.
Alternate approach routes allow selection/setting of the desired route with desired overlap.
Switches/buttons should have distinct colours for easy identification (various colour examples are listed).

Control Panel Indications

Provision for individual point operation.
Recording of emergency point operation (during failures) on a counter.
Necessary slotting for adjoining cabins/ground frames/level crossings.
Slot control using two buttons or switch (similar to route setting) to cancel slots, keeping the controlled route active until locking is effective.
Records of slot cancellation in a counter.
Preventing changing of the last operated position of signalling gear from the control panel after taking the SM's key.
Providing indications on a panel for major yards, focusing on position and maintenance staff information.
Providing indications for points, routes, and signals.
Point indications using lights (white/yellow/green) for position, flashing until locked.
Route indications using white lights (at least two per track section). Flashing white/red lights indicate route occupation/release.
Signal indications using red/yellow/green lights on the control panel, flashing indicators for failed aspects (different failure colours listed).
Indication of shunt signals, starter indicators, track circuits, and power supply.
Indication for approach track circuits, advance approach warnings (flashing/audible bells).
Signal lamp failure alarms.
Indication of signal aspects in different circumstances (e.g., shunt, ‘OFF’)
Clear indication of position for crank handle.
Indication of gate control (yellow steady, flashing).
Indication to signal that gate is open (red steady).
Specifications for control panel indicators (blinking for different situations, lights for healthy system).
Providing provisions for emergency releases.

Interlocking and Circuit Requirements

Signal circuits must be compatible with 25 KV AC electrified areas (Chapter 22).
Relay circuits should not use common returns.
Relay circuits should not use more than 45 metal-to-carbon contacts in series.
All new installations should use route setting type interlocking.

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Description

This quiz covers the essential criteria for circuit design including route setting principles, compliance with RE stipulations, and control panel standards. Learn about interfacing features, standard guidelines, and safety principles essential for effective design in electrified areas.