Air Conditioned Coaches Overview
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Questions and Answers

What should be done if the carbon brushes are worn out?

  • Clean them with compressed air
  • Replace them with brushes of approved grade (correct)
  • Lubricate them with petroleum jelly
  • Continue using them until they break

    • What is the purpose of checking the battery box suspension or cradle?

  • To verify the condition of fuses
  • To check for signs of bulb corrosion
  • To determine if they need oiling
  • To ensure proper battery cell fitment (correct)

    • What should be done in case of sulphation of terminals?

  • Ignore until corrosion appears
  • Apply heat to dissolve sulphation
  • Remove connectors, clean, and apply petroleum jelly (correct)
  • Replace the entire battery

    • What indicates a need for corrective action regarding the battery cells?

    <p>Abnormal bulging of cell lids</p> Signup and view all the answers

    What should be done before conducting a visual inspection of the batteries?

    <p>Blow off dust if required</p> Signup and view all the answers

    What checks must be performed on the starting resistance connectors?

    <p>Check for tightness</p> Signup and view all the answers

    What should be checked for the flexible type coupling?

    <p>Direction of rotation for correctness</p> Signup and view all the answers

    What is the maximum allowable time to attain a pressure of 7 Kg/sq.cm in the reservoir for the ACCEL compressor?

    <p>53 seconds</p> Signup and view all the answers

    Which component must be immersed in a water tank for 24 hours during maintenance?

    <p>Heat exchanger</p> Signup and view all the answers

    What pressure is used to pressurize the cooling coil after cleaning?

    <p>300 psi</p> Signup and view all the answers

    What is the purpose of the leak back test in the maintenance process?

    <p>To confirm volumetric efficiency</p> Signup and view all the answers

    Which of the following must be done to the coils and fins during maintenance?

    <p>Wash thoroughly with compressed water jet</p> Signup and view all the answers

    What should be the suction pressure gauge reading during operation?

    <p>2-3 Kg/cm2</p> Signup and view all the answers

    What is the required delivery pressure gauge reading?

    <p>10-14 Kg/cm2</p> Signup and view all the answers

    What should be the minimum oil pressure above the suction pressure?

    <p>3 Kg/cm2</p> Signup and view all the answers

    What condition indicates the suction line should be functioning appropriately?

    <p>Suction should be cold and sweaty</p> Signup and view all the answers

    What should be done to the rectifier cum regulator box?

    <p>Clean all dust with dry compressed air</p> Signup and view all the answers

    What should be checked regarding the expansion valve?

    <p>It should be cold and in a locked position</p> Signup and view all the answers

    How should dust be removed from the heat sink of electronic components?

    <p>With dry compressed air</p> Signup and view all the answers

    What should be done if there is water accumulation during maintenance?

    <p>Drain out the water</p> Signup and view all the answers

    What indicates that the battery settings should be verified?

    <p>Settings have not been disturbed</p> Signup and view all the answers

    What is the minimum airflow required to ensure proper operation of the condenser?

    <p>4 meters per second</p> Signup and view all the answers

    What should be used to clean the condenser fins thoroughly?

    <p>High pressure water jet</p> Signup and view all the answers

    What is the recommended action before performing maintenance on the inverter?

    <p>Switch off the inverter and battery fuses</p> Signup and view all the answers

    What action should be taken if the vent plugs are missing?

    <p>Replace them immediately</p> Signup and view all the answers

    How should you remove dust from the inside of the inverter?

    <p>Use a vacuum cleaner or a soft brush</p> Signup and view all the answers

    Which of the following components requires a cell tester for inspection?

    <p>Cells</p> Signup and view all the answers

    What should you do if you observe leakage from a capacitor inside the inverter?

    <p>Remove and replace it with a capacitor of the same value</p> Signup and view all the answers

    What should be used to apply to the battery boxes if necessary?

    <p>Paint</p> Signup and view all the answers

    What is the expected lifespan of the cooling fan in the inverter system?

    <p>3 years</p> Signup and view all the answers

    What is the correct torque value for tightening coupling and mounting bolts?

    <p>30 kg-m torque wrench</p> Signup and view all the answers

    What is one of the conditions to check concerning the flexible hose-pipe?

    <p>It must be connected properly at both ends</p> Signup and view all the answers

    What should be done if the cooling is not adequate?

    <p>Charge the refrigerant (R-22) if it is low</p> Signup and view all the answers

    What should be done if the carbon brushes in the compressor motor are defective?

    <p>Replace them with approved grade brushes</p> Signup and view all the answers

    Which fan must be checked between the inverter and the chopper?

    <p>Instrument cooling fan</p> Signup and view all the answers

    What should be done with burnt or damaged cooling fans?

    <p>Replace with new ones of the same rating</p> Signup and view all the answers

    How should the condition of the intercell connectors be addressed during maintenance?

    <p>They should be tightened and cleaned thoroughly</p> Signup and view all the answers

    Which process is recommended for ensuring proper connection and tightness of the incoming leads?

    <p>Checking leads with a multimeter</p> Signup and view all the answers

    Which component's locking arrangement must work properly when the control panel is engaged?

    <p>Chopper module</p> Signup and view all the answers

    What tool is recommended for cleaning inaccessible parts of the inverter safely?

    <p>Dry compressor (Max. 1 bar)</p> Signup and view all the answers

    What is the main purpose of checking anti-vibration mountings during maintenance?

    <p>To maintain system stability and reduce wear</p> Signup and view all the answers

    What should be examined for signs of overheating during maintenance?

    <p>Compressor</p> Signup and view all the answers

    What is the recommended method to clean carbon dust from the evaporator motor?

    <p>Compressed air</p> Signup and view all the answers

    Which component is checked for tightness to ensure proper functioning?

    <p>Compressor anti-vibration mountings</p> Signup and view all the answers

    What should be done if external damage is observed on the condenser fins?

    <p>Examine for flying ballast damage</p> Signup and view all the answers

    What is the importance of checking the condition of protection plates in the maintenance process?

    <p>To prevent electrical short circuits</p> Signup and view all the answers

    What action should be taken if leakage signs are found at joints and shaft seals?

    <p>Take remedial measures</p> Signup and view all the answers

    What is the primary purpose of examining the fixing arrangement during compressor maintenance?

    <p>To avoid operational failures</p> Signup and view all the answers

    What should be done if a cooling fan in the inverter is found to be damaged?

    <p>It needs to be replaced with a fan of the same rating.</p> Signup and view all the answers

    What is the appropriate action to take when observing leakage from a capacitor inside the inverter?

    <p>Remove the capacitor and replace it with a new one of the same value.</p> Signup and view all the answers

    Which method should be used for cleaning PCBs within the inverter?

    <p>Using a soft brush to gently remove dust.</p> Signup and view all the answers

    Before conducting any maintenance, what is the advised precaution regarding power supply?

    <p>Switch off the inverter and remove battery fuses at the power panel.</p> Signup and view all the answers

    What should be checked regarding the locking arrangement of the control panel?

    <p>Check that it functions correctly when the control panel is engaged.</p> Signup and view all the answers

    What is the expected suction pressure gauge reading during operation?

    <p>2-3 Kg/cm2</p> Signup and view all the answers

    What should the delivery pressure gauge reading indicate?

    <p>10-14 Kg/cm2</p> Signup and view all the answers

    What is the minimum oil pressure that must be maintained above the suction pressure?

    <p>3 Kg/cm2</p> Signup and view all the answers

    When checking the expansion valve, what should be the sensation when felt by hand?

    <p>Cold and sweaty</p> Signup and view all the answers

    What condition should the battery voltage be in during the LOAD and NO LOAD tests?

    <p>Stable or within expected range</p> Signup and view all the answers

    What should be done to the rectifier cum regulator box as part of maintenance?

    <p>Clean all dust with dry compressed air</p> Signup and view all the answers

    What type of cleaning device is preferred for removing dust from electronic components?

    <p>Dry compressed air blower</p> Signup and view all the answers

    What indicates that the voltage and current settings should be verified?

    <p>Unusual operational performance</p> Signup and view all the answers

    What should be done first when preparing the rectifier cum regulator box for maintenance?

    <p>Disconnect power supply</p> Signup and view all the answers

    What is the appropriate trip timing for the compressor during operation?

    <p>10 minutes</p> Signup and view all the answers

    What is the normal current range for the package in cooling mode?

    <p>20-23 Amp</p> Signup and view all the answers

    Which component's current should be checked for operational status in the condenser?

    <p>Condenser motors</p> Signup and view all the answers

    During the manual heating mode, what action is recommended regarding the package?

    <p>Check all terminals</p> Signup and view all the answers

    What is the function of LP-1 and LP-2 cutouts during operation?

    <p>Monitoring pressure</p> Signup and view all the answers

    What should be done if the compressor does not trip within the specified time frame?

    <p>Short terminals of vane relay</p> Signup and view all the answers

    What is the normal current rating for blower motors as per the operational guidelines?

    <p>1.5-2 Amp</p> Signup and view all the answers

    What maintenance action is necessary regarding contactors in old control panels?

    <p>Check and clean contacts</p> Signup and view all the answers

    In self-generating AC coaches with package units, which aspect must be visually inspected?

    <p>Condenser fan blades</p> Signup and view all the answers

    What is one key aspect to check regarding the compressor motors during maintenance?

    <p>Ensure proper tripping time</p> Signup and view all the answers

    What is the correct method to check the tightness of the axle pulley bolts?

    <p>Apply a force of 30 kg-m using a torque wrench.</p> Signup and view all the answers

    What measurement should be maintained when checking the gap between the two halves of the axle pulley?

    <p>3 mm</p> Signup and view all the answers

    What force should be applied to achieve proper tension on the belts?

    <p>Between 31.4 to 47.0 kg</p> Signup and view all the answers

    What should be checked regarding the V-grooves during inspection?

    <p>They must be smooth and even.</p> Signup and view all the answers

    What is the required condition for the battery chargers during maintenance?

    <p>Coarse and fine control switches should be in position No.1.</p> Signup and view all the answers

    What action should be taken if belts are found to be loose during inspection?

    <p>Tighten them to the correct tension.</p> Signup and view all the answers

    What specific detail should be checked for the battery cells?

    <p>Specific gravity and voltage.</p> Signup and view all the answers

    What distance should be checked using a gauge plate between the wheel hub and axle pulley?

    <p>Should be within 1 cm tolerance.</p> Signup and view all the answers

    What is a critical measurement to ensure the belts are correctly tensioned?

    <p>16 mm of deflection per meter of span.</p> Signup and view all the answers

    Which of the following tasks is essential for maintaining the axle pulley?

    <p>Lubricate the axle bolt thread.</p> Signup and view all the answers

    Study Notes

    Air Conditioned Coaches

    • Types of air-conditioned coaches are broadly classified as end-on-generation (EOG) and self-generating (SG) coaches.
    • EOG coaches use power cars with transformers.
    • SG coaches are of two types based on their AC equipment.
    • One uses 110 V DC with under slung AC equipment.
    • The other uses 110 V DC with roof-mounted AC.

    Major Equipments

    • Compressors (open type for under slung, sealed type for roof-mounted)
    • Condenser (including liquid receiver and dehydrator)
    • Expansion valve
    • Evaporator (with heater element)
    • Motor for compressor, condenser, and evaporator
    • Protective devices and control panels
    • Thermostat and filters

    Maintenance Schedules

    • Maintenance schedules are provided for self-generating air-conditioned coaches fitted with under-slung equipment.
    • Maintenance schedules are also provided for roof-mounted AC package units.

    Trip Schedule (Primary and Secondary Maintenance)

    • Axle Pulley: Examine the indicating white mark on the axle pulley, ensure it hasn't shifted. Tighten if necessary.
    • Belts: Check belts for fraying and overturn and correct it. Verify the number; 12 belts (6 on each side) are needed for primary depot alternators, and 10 (5 on each) for secondary depot. Feel the tension to verify correct adjustment by hand.
    • Alternators: Check the following on outgoing cables, and rectifying any defects.
      • Cables: Ensure correct connections on outgoing cables & grommets.
      • Suspension pin, bush, nuts & bolts.
      • Pulley components (lock nut, locking collar pins).
      • Terminal box: Inspect for overheating or presence of fumes.

    Battery & Battery Box

    • Check electrolyte levels and top up with distilled water if necessary.
    • Check the specific gravity and voltage of the pilot cells. Monitor inter-cell connections for looseness and repair cracks promptly.
    • Check for heating signs, discoloration, or cracks in the terminals and components. If found, immediately replace the defective components.
    • Monitor the positive and negative terminals for heating signs in battery banks.

    Evaporator Motor

    • Open the inspection cover and examine the condition of the commutator. Clean with sandpaper or pumice stone if necessary.
    • Verify carbon brushes and pigtails (replace if needed).
    • Assess the condition of the bearings, looking for unusual noise.

    Compressor

    • Check the proper lubrication and oil levels.
    • Ensure the oil level reaches half of the bull-eye glass.

    Dehydrator and Liquid Receiver

    • Check the sight glass for leakage and rectify if necessary.
    • After 10 minutes of starting the compressor, confirm the liquid refrigerant level is at the bottom.
    • After 15 minutes, assess the temperature difference between the outlet and inlet of the dehydrator.

    Other Points

    • Filters: Replace air filters regularly.
    • Thermostats: Check thermostats for functionality
    • Panel Board: Clean, check lamp indications, check fuse availability.
    • Lights and Fan Wiring: Check lights' proper operation, and rectify problems with fan operation or replacement of parts.
    • Battery charges: Ensure the control switch is in the correct position and clean the connections.

    Monthly Schedule

    • Axle Pulleys: Inspect gap between pulley halves, ensure tightness, and verify distance between wheel hub and axle pulley with gauge plate.
    • Belts: Check tension, adjust/replace if necessary.
    • Rectifier Cum Regulator Box: Clean with dry compressed air. Inspect sealing rubber gasket; rectify defects as needed.
    • Alternators: Lubricate threads, inspect V grooves, and replace worn-out pulleys.
    • Battery Chargers: Confirm proper switch position (coarse/fine), and clean connections.
    • Batteries: Inspect specific gravity and voltage of cells.

    Overhauling Activities

    • Compressors: Check oil pressure, evaluate condition, and replace worn-out components thoroughly.
    • Rectifier Cum Regulator Box: Inspect the sealing gasket, look for signs of fraying, and address any defects.
    • Alternators: Check insulation resistance (using a 500V megger) and address issues if required.
    • Batteries: Ensure they are fully charged.
    • Test on Overhauled Compressors: Various, comprehensive tests (temperature rise, volumetric efficiency, leak back vacuum, submerge) should be conducted and documented on overhauled compressors.

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    Description

    Explore the various types of air-conditioned coaches including end-on-generation and self-generating units. This quiz covers major equipment used in these coaches, maintenance schedules, and the specific maintenance required for different AC setups. Test your knowledge on air conditioning systems in railway transport.

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