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Questions and Answers
What is the maximum allowable voltage loss in wires connecting equipment?
What is the maximum allowable voltage loss in wires connecting equipment?
How often should physical inspections of the interlocking system be performed?
How often should physical inspections of the interlocking system be performed?
Which class of surge protective device is recommended at the output of the power supply equipment?
Which class of surge protective device is recommended at the output of the power supply equipment?
What is the required minimum cross-sectional area for the earth wire used for EI?
What is the required minimum cross-sectional area for the earth wire used for EI?
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What type of maintenance terminal is mentioned for the Electronic Interlocking System?
What type of maintenance terminal is mentioned for the Electronic Interlocking System?
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What color indicates a Running signal?
What color indicates a Running signal?
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Which light indicates that the Point is locked?
Which light indicates that the Point is locked?
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What color is used for the Shunt signal when it is OFF?
What color is used for the Shunt signal when it is OFF?
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What happens when the route is not set?
What happens when the route is not set?
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Which indication shows that the track is occupied?
Which indication shows that the track is occupied?
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What color light indicates a Failure of the green signal?
What color light indicates a Failure of the green signal?
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When the Crank Handle (CH) key is in Locked position, what is the light indication?
When the Crank Handle (CH) key is in Locked position, what is the light indication?
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What indicates the Calling ON status?
What indicates the Calling ON status?
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What does the yellow steady light indicate when the gate is closed?
What does the yellow steady light indicate when the gate is closed?
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What is the required time for the emergency control from the control panel?
What is the required time for the emergency control from the control panel?
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What happens when the gate slot is not taken back from the control panel?
What happens when the gate slot is not taken back from the control panel?
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Which type of indication should be provided at the corner of the control panel with an approved electronic flasher relay?
Which type of indication should be provided at the corner of the control panel with an approved electronic flasher relay?
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What is the purpose of mid stroke point reversal preventing features in point control circuits?
What is the purpose of mid stroke point reversal preventing features in point control circuits?
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What is not required for the clearing of shunt signals?
What is not required for the clearing of shunt signals?
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What describes a sequential route release process?
What describes a sequential route release process?
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What is the maximum time for the sub route emergency cancellation?
What is the maximum time for the sub route emergency cancellation?
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Which circuit types should not be provided in vital circuits?
Which circuit types should not be provided in vital circuits?
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How long is the point operation timer set for?
How long is the point operation timer set for?
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What type of relays must be used for time elements according to the general requirements?
What type of relays must be used for time elements according to the general requirements?
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What is the purpose of the white indication for block central on the last stop signal?
What is the purpose of the white indication for block central on the last stop signal?
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What is the release time for the CH emergency key?
What is the release time for the CH emergency key?
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How long must the power failure alarm last for?
How long must the power failure alarm last for?
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What is the required action for the holding HR relay?
What is the required action for the holding HR relay?
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What condition must be met regarding the contacts of the approved electronic time element relays?
What condition must be met regarding the contacts of the approved electronic time element relays?
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What type of fire suppression system may be provided at stations with more than 100 routes?
What type of fire suppression system may be provided at stations with more than 100 routes?
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Which of the following is a requirement for maintaining Electronic Interlocking (EI) installation?
Which of the following is a requirement for maintaining Electronic Interlocking (EI) installation?
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What is the primary purpose of using twisted input and output cables in EI installations?
What is the primary purpose of using twisted input and output cables in EI installations?
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Which testing method is performed at the factory for Electronic Interlocking systems?
Which testing method is performed at the factory for Electronic Interlocking systems?
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What type of surge protection device is indicated for use in Electronic Interlocking installations?
What type of surge protection device is indicated for use in Electronic Interlocking installations?
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What should be provided in the room where the Electronic Interlocking is installed?
What should be provided in the room where the Electronic Interlocking is installed?
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What is a recommended practice when conducting testing for Electronic Interlocking?
What is a recommended practice when conducting testing for Electronic Interlocking?
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What is a common practice to prevent damage from electrostatic discharges near electronic equipment?
What is a common practice to prevent damage from electrostatic discharges near electronic equipment?
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What condition must be met for the crank handle point key to be released?
What condition must be met for the crank handle point key to be released?
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What does the blinking green LED indicate on the control panel?
What does the blinking green LED indicate on the control panel?
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What is the required action when emergency operations are initiated?
What is the required action when emergency operations are initiated?
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What is an essential feature of the Central Control Circuits regarding cut operations?
What is an essential feature of the Central Control Circuits regarding cut operations?
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Which of the following must be done after a time delay of at least 120 seconds during system startup?
Which of the following must be done after a time delay of at least 120 seconds during system startup?
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What is the main purpose of the redundancy feature mentioned?
What is the main purpose of the redundancy feature mentioned?
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What problem does the central cut design aim to eliminate?
What problem does the central cut design aim to eliminate?
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Which component is essential for ensuring the EI system's communication?
Which component is essential for ensuring the EI system's communication?
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Study Notes
Chapter 21: Relays & EI
- Panel buttons have different colors for various signals
- Running signal = Red
- Shunt signal = Yellow
- Calling on = Red with white dot
- Enit button = White
- Alternate Queradap = White with black dot
- Alternate Renta = Grey
- Point Slot = Black
- Grank Handle = Blue
- Point group = Black with red dot
- Point slot is given by any two agencies
- Paint indication:
- White/Yellow/Green light near the point
- Flashing during operations for correct positioning
- Illuminated small white light near the point button for point locked indication
- Route indication:
- Route set and locked: White light (at least two) on each track section
- Route not set: Route indicator lamps not lit
- Signal indications:
- Stop signal ON = Red
- Permissive signal ON = Yellow
- All signal aspects not available = Panel is not operational
- Failure of signals:
- Green = Green flashes, Red blank
- Fellow = Green flashes, Red lit
- Double yellow = Both Green and Red flashes
- Red = Shunt signed "OFF"
- Calling "ON" = "OFF!" = Blanting white light strip or two miniature lights on panel, white light on panel & miniature yellow at site
- Track circuit indication:
- Occupied track: Red light (at least two)
- Approach track cut controlling calling on signal
- Warning of approach track (audio & visual)
- Signed time failure alarm
- CH indications:
- When CH key locked = Yellow steady
- CH key released = Red Flashing
- CH key entracted = Red steady
- Emergency CH key release from control panel = Yellow flashing
- Signal lock indication:
- Gate closed and locked = Yellow steady
- Gate slot released, but gate not open = Yellow flashing
- Gate open = Red steady
- The control panel indication lamps operate with 24V miniature lamps or light emitting diodes
- Interlocking circuit requirements
- Common return is not provided in a vital circuit
- Using relays, the number of contacts cannot exceed 45 in series to avoid circuit issues
- Use route interlocking circuits to link routes if necessary
- Calling on signals with provisions for track cut
- Indication lamps for signal ahead, if not required, not to be blank
- Cleaning of points & signals
- Provisions for cleaning circuits
- Cleaning of points and signals
- Different signal indications
- Signal lock indication:
- A white indication for the last stop signal when control panel is needed.
- Block working built into EI for live clearing purposes (e.g., CTCF, TGT, TOL)
- Timers for various signals based on different operations (e.g., main stop, sub-route, CH emergency key release, shunt signal, calling on signal, signal overlap, calling on initiation, calling on starter, opening of gate)
- Point failure alarm, point operation timer, signal blank buzzer, panel button struck up alarm, HR relay de-energization, HR relay energized, central timer de-energization, power failure alarm
- Relay (general requirements)
- Use approved time element relays
- Use two relays with series contacts for time release circuit
- All relays (except track relay) need minimum 10% working contact
- Wire connecting equipment to signals must avoid high voltage drops
- Sealing of plug-in relays (metal to metal and metal to carbon)
- Relay replacement times (track relay and live relay) using specific parameters (e.g., 19 years as per SEM, 25-30 years)
- Wiring materials for relay installations (e.g., PVC insulated unarmoured cable) with different sizes
- Rack to rack cabling
- Following practices for internal wiring
- Connections to plug-in modules will be non-praved
- Flexible wire with specified sizes
- Circuit breaker, lever locks for specified sizes
- Relay racks with sufficient capacity
- Fuse, terminals, and terminal links (e.g., cartridge type fuses)
- Specific color codes for different ratings
- AC provided in cases where more than 100 points
- Protection for automatic fire suppression system and fire detection system
- Electronic interlocking (EI) operations
- Route setting type using drop-down entry
- Proper record maintenance for stations, divisions, and headquarters
- Installation of EI with approved guidelines and TAN
- Application logic and inputs/outputs
- Embedded block working in EI display
- FRP insulated ladders
- Electrostatic floor pads and hand bands
- Room where EI is installed
- Additional metallic structure protection requirements (e.g., separate class A at the top)
- Testing of signals
- Factory acceptance tests (FAT) and site acceptance tests (SAT)
- Use of computer simulation software for testing (e.g., software for control tables and cross tables)
- FAT and SAT
- Includes logic and interlocking testing and interface equipment testing
- Power supply
- Separate external supply
- Maintenance
- Yearly physical inspection of system integrity
- Electrical signaling cut
- Responsibility of SSE/JE/FIG (up to 20 routes)
- Other designations (e.g., Aste/DSTE) with responsibility for more than 20 routes
- Lighting & surge protection for signaling equipment using Class B/Type-I, Class C/Type-II, and Class D/Type-III in different environments
- Earthing requirements for signaling systems (e.g., minimum wire size)
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Description
This quiz covers Chapter 21 on relays and electrical indications. It focuses on color codes for panel buttons, signal indications, and routing indicators. Ensure you understand the significance of each color and signal for proper operational functionality.
