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Questions and Answers
What is the ideal height for the crossover contact wire in relation to the main line contact wire?
What is the ideal height for the crossover contact wire in relation to the main line contact wire?
What should be done to ensure the free movement of the Anti Falling Device (ATD)?
What should be done to ensure the free movement of the Anti Falling Device (ATD)?
Which of the following checks should be performed on damaged Over Head Equipment (OHE) components?
Which of the following checks should be performed on damaged Over Head Equipment (OHE) components?
What is the required force to be ensured during the leveling of the pantograph pan?
What is the required force to be ensured during the leveling of the pantograph pan?
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What action should be taken if pantograph strip joints are not smooth?
What action should be taken if pantograph strip joints are not smooth?
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What is a primary cause of pantograph entanglement?
What is a primary cause of pantograph entanglement?
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What percentage of OHE failures are attributed to improper adjustments at turnout and crossover?
What percentage of OHE failures are attributed to improper adjustments at turnout and crossover?
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What is the minimum height difference required between turnout and main line contact wire?
What is the minimum height difference required between turnout and main line contact wire?
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Which component is essential to avoid dropper failure in the overhead equipment?
Which component is essential to avoid dropper failure in the overhead equipment?
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What should be checked before making adjustments to turnout and crossover locations?
What should be checked before making adjustments to turnout and crossover locations?
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What is the purpose of 'C' jumpers at cross-over and turn-out points?
What is the purpose of 'C' jumpers at cross-over and turn-out points?
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What should be ensured regarding the pantograph when moving onto the main line?
What should be ensured regarding the pantograph when moving onto the main line?
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What is the maximum distance from the obligatory mast where hogging on M/L contact wire should be addressed by increasing the length of 'B' and adjoining droppers?
What is the maximum distance from the obligatory mast where hogging on M/L contact wire should be addressed by increasing the length of 'B' and adjoining droppers?
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At what height difference should the contact wire height at the obligatory mast between M/L and L/L OHE be maintained?
At what height difference should the contact wire height at the obligatory mast between M/L and L/L OHE be maintained?
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How much should the loop line contact wire height be adjusted towards the turn out side as compared to the main line contact wire height?
How much should the loop line contact wire height be adjusted towards the turn out side as compared to the main line contact wire height?
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What is one of the potential consequences of improper tensioning of the OHE?
What is one of the potential consequences of improper tensioning of the OHE?
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What component's malfunction can lead to defects causing panto entanglement?
What component's malfunction can lead to defects causing panto entanglement?
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What is the recommended static force that a pantograph should exert on the contact wire?
What is the recommended static force that a pantograph should exert on the contact wire?
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What is necessary to prevent snapping of the contact wire?
What is necessary to prevent snapping of the contact wire?
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What adjustment should be made when running a tower wagon on M/L in relation to the L/L cross over contact wire?
What adjustment should be made when running a tower wagon on M/L in relation to the L/L cross over contact wire?
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During maintenance, how high should the panto pan be adjusted to ensure static balance?
During maintenance, how high should the panto pan be adjusted to ensure static balance?
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What happens if the static force exerted by the pantograph is too low?
What happens if the static force exerted by the pantograph is too low?
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What is the purpose of providing a 100 mm sleeve on anti-falling device rods in relation to the ATD?
What is the purpose of providing a 100 mm sleeve on anti-falling device rods in relation to the ATD?
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What should be done to replace worn panto pan strips?
What should be done to replace worn panto pan strips?
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What should be ensured about the ATD drum to maintain proper OHE tension?
What should be ensured about the ATD drum to maintain proper OHE tension?
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What role do split pins play in the pantograph?
What role do split pins play in the pantograph?
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What should be ensured to prevent damage to the panto due to mechanical failures?
What should be ensured to prevent damage to the panto due to mechanical failures?
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Which of the following is not a direct cause of pantograph defects?
Which of the following is not a direct cause of pantograph defects?
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What should be done if sharp edges are found on the panto pan strips?
What should be done if sharp edges are found on the panto pan strips?
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When should static adjustment and counter balancing of the pantograph be performed?
When should static adjustment and counter balancing of the pantograph be performed?
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What is the primary purpose of conducting a liquid dye penetrant test on critical components?
What is the primary purpose of conducting a liquid dye penetrant test on critical components?
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What should be ensured regarding the pantograph pan during inspections?
What should be ensured regarding the pantograph pan during inspections?
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Which item must be measured to ensure proper functioning of the overhead equipment?
Which item must be measured to ensure proper functioning of the overhead equipment?
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Why is it important to check for hit marks on the pantograph and OHE components?
Why is it important to check for hit marks on the pantograph and OHE components?
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What should be checked to assess the condition of OHE fittings?
What should be checked to assess the condition of OHE fittings?
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What is an essential condition for the pantograph wearing strips?
What is an essential condition for the pantograph wearing strips?
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What should the mechanical movement of the panto pan ensure?
What should the mechanical movement of the panto pan ensure?
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What is necessary regarding split pins in pantographs during inspection?
What is necessary regarding split pins in pantographs during inspection?
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What should be inspected to determine the state of broken pantograph components?
What should be inspected to determine the state of broken pantograph components?
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What is the correct action during restoration after panto entanglement?
What is the correct action during restoration after panto entanglement?
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What is the significance of ensuring a 5 cm height difference between the crossover contact wire and the main line contact wire?
What is the significance of ensuring a 5 cm height difference between the crossover contact wire and the main line contact wire?
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What maintenance check is essential to identify potential issues with pantograph components before failure occurs?
What maintenance check is essential to identify potential issues with pantograph components before failure occurs?
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Which function does the 100 mm sleeve on anti-falling device rods serve in relation to the panto?
Which function does the 100 mm sleeve on anti-falling device rods serve in relation to the panto?
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When inspecting pantograph components after entanglement, which item is crucial for assessing the state of the pantograph pan?
When inspecting pantograph components after entanglement, which item is crucial for assessing the state of the pantograph pan?
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Which aspect is not directly involved in the proper functioning and maintenance of pantograph wearing strips?
Which aspect is not directly involved in the proper functioning and maintenance of pantograph wearing strips?
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What is the main preventative measure to avoid pantograph entanglement caused by OHE defects?
What is the main preventative measure to avoid pantograph entanglement caused by OHE defects?
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Which measurement is critical before adjusting turnouts and crossovers?
Which measurement is critical before adjusting turnouts and crossovers?
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Why are 'C' jumpers specifically recommended at certain distances from masts during crossover adjustments?
Why are 'C' jumpers specifically recommended at certain distances from masts during crossover adjustments?
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What is the recommended height difference between the turnout contact wire and the main line contact wire at obligatory locations?
What is the recommended height difference between the turnout contact wire and the main line contact wire at obligatory locations?
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What should be ensured about the relationship between the pantograph and the crossover contact wire while moving onto the main line?
What should be ensured about the relationship between the pantograph and the crossover contact wire while moving onto the main line?
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What failure condition is particularly relevant to pantograph entanglement during the adjustment of turnouts?
What failure condition is particularly relevant to pantograph entanglement during the adjustment of turnouts?
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What should be done to ensure the worn pantograph wearing strips are functioning correctly?
What should be done to ensure the worn pantograph wearing strips are functioning correctly?
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What is the purpose of measuring the stagger of the contact wire?
What is the purpose of measuring the stagger of the contact wire?
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What may indicate the need for immediate intervention during checks after panto entanglement?
What may indicate the need for immediate intervention during checks after panto entanglement?
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What inspection detail is crucial for broken components of the pantograph?
What inspection detail is crucial for broken components of the pantograph?
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What maintenance should be prioritized to prevent panto pan tilting?
What maintenance should be prioritized to prevent panto pan tilting?
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Which component's movement must be checked to ensure effective functioning after panto entanglement?
Which component's movement must be checked to ensure effective functioning after panto entanglement?
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What should be checked concerning the availability of split pins during pantograph inspection?
What should be checked concerning the availability of split pins during pantograph inspection?
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Why is it important to conduct liquid dye penetrant tests on critical components?
Why is it important to conduct liquid dye penetrant tests on critical components?
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What action should be taken if the steady arm is not freely moving vertically?
What action should be taken if the steady arm is not freely moving vertically?
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What is a critical aspect of inspecting the condition of OHE fittings?
What is a critical aspect of inspecting the condition of OHE fittings?
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How can hogging on the main line (M/L) contact wire be effectively corrected?
How can hogging on the main line (M/L) contact wire be effectively corrected?
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What should be the minimum height difference at the obligatory mast between the main line (M/L) and loop line (L/L) overhead equipment (OHE)?
What should be the minimum height difference at the obligatory mast between the main line (M/L) and loop line (L/L) overhead equipment (OHE)?
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What is the purpose of providing a 100 mm sleeve on the anti-falling device rods?
What is the purpose of providing a 100 mm sleeve on the anti-falling device rods?
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During a maintenance procedure, how much should the loop line contact wire height be adjusted towards the turn-out side compared to the main line contact wire height?
During a maintenance procedure, how much should the loop line contact wire height be adjusted towards the turn-out side compared to the main line contact wire height?
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What happens if the automatic tensioning device (ATD) drum is not moving freely?
What happens if the automatic tensioning device (ATD) drum is not moving freely?
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Which of the following is a recognized defect that can lead to pantograph entanglement?
Which of the following is a recognized defect that can lead to pantograph entanglement?
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What should be frequently checked to prevent snapping of the contact wire in the overhead equipment?
What should be frequently checked to prevent snapping of the contact wire in the overhead equipment?
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What is an important adjustment related to the height of the contact wire for loop lines during maintenance?
What is an important adjustment related to the height of the contact wire for loop lines during maintenance?
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What should be ensured about the height of the contact wire when taking into account the track level differences?
What should be ensured about the height of the contact wire when taking into account the track level differences?
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What is the primary consequence of improper static force on the overhead equipment (OHE)?
What is the primary consequence of improper static force on the overhead equipment (OHE)?
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During which inspection should the leveling of the panto pan be verified?
During which inspection should the leveling of the panto pan be verified?
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What maintenance practice is essential to prevent potentially damaging vibrations in the pantograph?
What maintenance practice is essential to prevent potentially damaging vibrations in the pantograph?
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What is the acceptable maximum wear limit for replacing pantograph strips?
What is the acceptable maximum wear limit for replacing pantograph strips?
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What action should be taken to ensure the integrity of the split pins in the pantograph?
What action should be taken to ensure the integrity of the split pins in the pantograph?
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What should be checked for cracks during maintenance of the pantograph?
What should be checked for cracks during maintenance of the pantograph?
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How should the tension of the upspring be adjusted for proper pantograph operation?
How should the tension of the upspring be adjusted for proper pantograph operation?
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What can result from broken or missing components such as cracks in the plunger or balancing rod?
What can result from broken or missing components such as cracks in the plunger or balancing rod?
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What is the typical static force range that a pantograph should exert on the contact wire?
What is the typical static force range that a pantograph should exert on the contact wire?
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Which component is critical to the static adjustment and counterbalancing of the pantograph?
Which component is critical to the static adjustment and counterbalancing of the pantograph?
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Study Notes
Pantograph Entanglement
- Pantograph entanglement occurs when a part of the pantograph comes between overhead wires or vice versa, disrupting electric traction traffic
- Reasons for pantograph entanglement include pantograph defects, overhead line equipment (OHE) defects, and external factors
- Damaged OHE components (insulators, cantilevers, jumpers, droppers) can foul with the pantograph, leading to entanglement
- Regularly check OHE components for cracks to prevent entanglement
- Ensure proper provision of C jumpers and double PG clamps to avoid dropper failures
- Turnout and crossover adjustments are crucial
- Incorrect turnout/crossover adjustment (stagger and height) causes pantograph entanglement with overhead wires while moving on a main line
- Tumout/crossover contact wires should be 5cm above main line wires at obligatory locations
- Pantograph should not touch the turnout/crossover contact wires while on the main line
- Turnout and crossover adjustments should adhere to RDSO drawings
Procedure for Adjustment of Turnout and Crossover
- Before adjustments, verify free movement of Automatic Train Detectors (ATDs) for both main and loop lines
- Measure the obligatory mast implantation from loop and main line tracks, and adjust turnout as per specified standards
Pantograph Defects
- Spring box failures are a significant cause of pantograph defects
- Checking for cracks in the spring box, welding, cylinder supports, and submountings is essential
- Adequate lubrication of plungers is vital
- Panto pan strips should be replaced if worn down to 2mm
- Static force on contact wire prevents oscillations
- Maintaining a static force of approximately 7kg is crucial
- Pantograph balancing at an appropriate height (2.25m) should be ensured
- Proper inspection and maintenance of split pins is mandatory during inspection and pan changes
- Broken or damaged components, such as plungers, balance rods, and articulation rods, can cause entanglement
Checks after Panto Entanglement
- Verify height and stagger of contact wires for main lines and crossovers
- Measure contact wire height and steady arm clamp relative to register arm
- Check for hit marks on steady arm, registration arm, etc. for signs of damage
- Ensure proper fastening of pantograph wearing strips
- Check for cracks or damage in OHE fittings like clamps, suspension brackets and clips
- Check pantograph wearing strips and ensuring alignment, preventing bends or grooves
- Inspect the mechanical movement of panto pan to ensure smooth vertical and horizontal movement
- Verify availability of split pins and proper condition of broken components
Measurement of Pantograph
- Define specific measurements (A-520, B-1800, C-300, D-380) for panto units as needed
OHE Height
- Ensure crossover contact wire height is 5cm above main line contact wire
- Regular checks (every six months) are needed for proper height maintenance
Free Movement of ATD
- Ensure free movement of ATD (Automatic Tensioning Device) at turnouts and crossovers
Identifying Damaged OHE Components
- Inspect insulators and droppers for breakage
- Secure G jumpers with double PG clamps, and provide C jumpers to avoid failures
Contact Wire Joints
- Visually inspect and splice damaged contact wire joints
Pantograph Wearing Strips
- Verify fastening, thickness, and grease plate fastening
RDPT of Pantograph Components
- Perform Red Dye Penetrant Test for any cracks before they cause entanglement
Static Adjustment and Leveling of Panto Pan
- Maintaining a constant 78kg force and ensuring panto pan leveling
Pantograph Entanglements: Items to be Checked
- Check pantograph wearing strips
- Check grease plate fastening
- Check bow plunger movement
- Check pantograph pan horizontality and vertical movement
- Check pantograph connections and other components
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Description
Test your knowledge on the maintenance and specifications of overhead equipment (OHE) used in railway systems. This quiz covers critical topics such as the ideal height for contact wires, checks for damaged components, pantograph adjustments, and more. Perfect for those studying railway engineering or working in overhead equipment maintenance.
