ABTH

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Author:
elkhunter
ID:
281385
Filename:
ABTH
Updated:
2014-08-31 15:36:01
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ABTH
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Description:
Air Brak and Train Handling
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  1. What is a full service application?
    A service reduction of brake pipe pressure that equalizes the pressure between the brake cylinder and auxiliary reservoir.
  2. What is the maximum independent brake cylinder pressure allowed on a locomotive with single shoe per wheel brake rigging?
    72 psi
  3. What is the maximum independent brake cylinder pressure allowed on a locomotive equipped with clasp type brake shoe rigging. (2 shoes per wheel)?
    45 psi
  4. When changing operating ends:

    Before cutting in the automatic brake valve, what should you observe on the guages?
    That equalizing reservoir pressure is grater than the brake pipe pressure.
  5. Relates to the flow of air when charging the train brake system.

    After being controlled to the prescribed pressure, air flows through the (BLANK) and on into the (BLANK) where it is supplied to each car.
    Automatic Brake Valve, brake pipe
  6. Relates to flow during a service brake application.

    After the train brake system is charged, movement of the automatic brake valve handle into the service zone will reduce (BLANK), which in turn reduces (BLANK) pressure.
    Equalizing reservoir pressure, brake pipe
  7. Relates to the flow of air during a release of the brakes.

    Movement of the automatic brake valve to the release position will increase (BLANK) pressure which will in turn increase (BLANK) pressure.
    Equalizing reservoir, Brake Pipe
  8. Which of the following best describes Quick Service?
    Local venting of brake pip air at each car which occurs during an initial service application.
  9. When cutting out cars how many air brakes next to each other can be cut out?
    No more than two together.
  10. Quick service locally vents (BLANK) brake pipe pressure and develops approximately (BLANK) brake cylinder pressure.
    4-6psi, 10-12 psi
  11. What is true of charging chokes?
    They allow brake pipe air to flow rapidly throughout the train to promote a more uniform charging and release of the train brakes.
  12. What is "heavy grade"?
    At least 1% grade for 3 miles or more.
  13. What is "mountain grade"?
    2% or greater for 2 miles or more.
  14. The "HP" position on the retaining valve is used to:
    Exhaust brake cylinder pressure to 20 psi.
  15. Piston travel on body mounted brake cylinders must be adjusted:

    And not exceed:
    6-9 inches at initial terminal

    10 1/2 inches at intermediate inspection points
  16. When a penalty brake application occurs:

    First step:
    Move the ABV handle to suppression position.
  17. When a penalty brake application occurs:

    Second Step:
    Actuate and use desired independent brakes.

    If in power return to IDLE.
  18. When a penalty brake application occurs:

    Third Step:
    When operating conditions allow, move the ABV handle to RELEASE and note the PCS resets.
  19. What feature of the freight car control valve uses emergency reservoir air to more rapidly transmit a brake release serially through the train?

    How much of brake pipe reduction does it take to trigger?
    Accelerated Service Relese

    10 psi
  20. A handheld air gauge used for air brake tests must have been checked for accuracy within the last (BLANK) days.
    92
  21. How do extended range dynamic brakes differ from basic range dynamic brakes?
    They maintain an effective retarding force down to 6 mph before fading.
  22. Between what speeds can you expect basic dynamic brakes to be most effective?
    18-28 mph
  23. What speed do basic dynamic brakes become less effective?
    10 mph
  24. How much retarding force do high capacity brakes per axle have?
    13,500 lbs
  25. What are the maximum axles of dynamic brake allowed on the head end?
    28
  26. The RPA of a locomotive consist must not exceed:
    42 axles
  27. Trains made up entirely of intermodal equipment may operate with a maximum RPA of:
    48
  28. If you get a hot bearing alarm from a TWD and are unable to find a defect what is required?

    If you pass another TWD and get an alarm what is required?
    • Continue your trip, closely observing indicated equipment for 25 miles or another inspection by a bearing inspection. 
    • Notify connecting crew member, mechanical personnel, and a supervisor. 

    Set out indicated equipment.
  29. What are the positions on a four position retaining valve?
    Direct Exhaust, High Pressure, Low Pressure, Slow Direct Exhaust
  30. What is the maximum train speed when operating with retaining valves set?
    15 mph
  31. The "LP" position on the retaining valve is used to:
    Exhaust brake pressure to 10 psi
  32. If your speed indicator fails enroute and a Daily Inspection is performed, how will you proceed?
    Do not exceed 20 mph
  33. If your speed indicator fails enroute how may you proceed?
    Track speed until the next facility, or when a daily inspection is due.
  34. Four steps to recharge your brake system on a grade.
    • 1. Apply a sufficient number of handbrakes
    • 2. Release the Automatic.
    • 3. Recharge the air brake system 
    • 4. After recharging the system, make a sufficient brake pipe reduction to hold the train while releasing the handbrakes.
  35. False Gradient:
    The gradient that exists when the system is less than fully charged.
  36. Inverse Gradient:
    Brake pipe pressure is higher at the rear than the head end. (beginning of a brake application)
  37. Normal Gradient:
    System is fully charged
  38. What is the brake cylinder pressure after a full service reduction with a brake system charged to 90 psi?
    64 psi
  39. How much brake cylinder pressure would develop if a 20 psi brake pipe reduction were made on a fully charged train with the regulating valve set at 90 psi?
    50 psi
  40. What determines if a locomotive has high capacity dynamic brakes when looking at the rating?
    + symbol
  41. What dynamic brake system will develop maximum retardation in handle position 4 at higher speeds?
    taper
  42. For movement of light engines and engines with caboose only moves, isolate excess units in a consist to comply with which of the following:
    Only one axle of power per each 120 tons of consist may be online.

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