LET Day 8 Review

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1. How do you correct (extinguish) the Dynamic Brake Warning Light?
Gradually reduce the Dynamic Brake output until the light goes out
2. While handling a locomotive consist with 20 or more Powered Axles and your speed is below 12 MPH, what throttle position must you avoid?
Notch 8
3. Where can locations for checking the accuracy of the speed indicator on the controlling locomotive be found?
Special Instructions (Timetable)
4. While handling a locomotive consist with a DC powered locomotive in it, at speeds above 25 MPH, adjust the throttle at least _ seconds before reaching a diamond or drawbridge.
8 seconds
5. A speed indicator must be accurate within how many MPH while traveling at speeds between 10 and 30 MPH?
3 MPH
6. A speed indicator must be accurate within how many MPH while traveling at speeds above 30 MPH?
5 MPH
7. The minimum continuous speed for the locomotive consist is the _______ continuous speed of any of the on-line locomotives in the consist.
Highest
8. How many Powered Axles does an AC locomotive have?
9
9. True or False
When making throttle position changes, allow time between changes to allow for in-line train forces to adjust.
True
10. Any time the locomotive is left standing, what position must the Independent Brake be placed?
Full Application
11. When operating a locomotive consist with 20 or more axles, Brake Cylinder pressure should be kept below __ PSI when controlling speed or stopping.
25 PSI
12. The Independent Brake should be Actuated for how many seconds for each locomotive in the consist to make sure the brakes are released on the engines?
4 seconds per locomotive
13. What are 3 indications that the train's brake system is not charged?
• The air flow indicator is reading higher than what it had been before the previous air brake application
• Brake pipe pressure on rear car is lower than what it was before making the previous brake application
• A shorter brake pipe exhaust than when the brake system was fully charged
14. Where should the results of a Speed Indicator Accuracy Test be recorded?
Locomotive Work Report
15. When the head 1/3 of the train is passing through turnouts and crossovers, and the Dynamic Brake Axle Value exceeds 12, do not exceed Dynamic Brake position __.
4
16. What are the positions for the following switches, and circuit breakers so that the Dynamic Brake will operate?
1. Dynamic Brake circuit breaker on controlling locomotive
2. Dynamic Brake Cut-Out switch
3. Brake Transfer Circuit Breaker
• 1. On
• 2. In
• 3. On
• All must be turned on.
17. Once tagged, can you continue to use a locomotive for having inoperative Dynamic Brakes?
Yes, for 30 Calendar Days
18. What is the maximum Dynamic Brake Axle value when all units have Alignment Control Couplers?
24
19. What is the maximum Dynamic Brake Axle value when any locomotive in the consist has Coupler Limiting Blocks?
20
20. What is the device called that automatically nullifies the extended range feature when the Brake Cylinder pressure is 15 PSI or greater?
Independent Pressure Switch
21. What is the device that automatically actuates the locomotive brakes when the Dynamic Brakes and Automatic Brakes are used in conjunction with each other?
Dynamic Brake Interlock
22. What must the initial brake pipe reduction be?
Minimum Service
6 to 8 PSI
23. When the Brake Pipe system is not fully charged, how much should an initial reduction be made?
At least 3 PSI greater than the total previous reduction
24. If a locomotive operates in the 1 Hour Zone for 15 minutes, then operates in the 30 Minute Zone, what is the available time the locomotive can be operated in Short-Time?
15 minutes
25. What are the 4 steps to cool Traction Motors down?
• 1. Stop Movement
• 2. Center Reverser
• 3. Generator Field to Off
• 4. Notch 4 for 20 minutes
26. Short-Time Rate is defined by?
The maximum time the locomotive can operate at a given output in Throttle position 8 without risking heat damage to the Traction Motors
27. Can a safety device be Cut Out or Annulled?
Only with permission from the Dispatcher if the safety device becomes defective prohibits normal train movement
28. What are 3 reasons why, except for emergency application or when required by rule, you should avoid making Brake Pipe reductions after a point of equalization?
• 1. It provides no additional braking effort
• 2. It serves only to waste air
• 3. It may eliminate the ability to make an emergency application
29. When restricting the Dynamic Brake Axle Value, the engineer must:
• Place the dynamic brake cut-out switch in the OUT position
• Leave the dynamic brake on the controlling locomotive cut in
• Report status of the dynamic brake cut-out switch position in Section 3 of the brake test certificate
30. How much time must you operate outside the Short-Time Rating Zone to restore maximum allowable time?
20 minutes

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 Author: Anonymous ID: 272561 Filename: LET Day 8 Review Updated: 2014-05-01 20:53:31 Tags: LET Folders: Description: LET Day 8 Review 4/14 Show Answers:

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