# LET Day 8 Quiz

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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.

(ref 5505D5)
2. While handling a locomotive consist with 20 or more POWERED AXLES, if possible, avoid throttle position __ at speeds below __ MPH.
#8.

12 MPH.

(ref 5504A3)
3. Where can locations for checking the accuracy of the speed indicator on the controlling locomotive be found?
Special Instructions (Timetable).

(ref 5403A)
4. 1.  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.

2.  If throttle is above position 4, reduce to position __.

3.  If throttle is in position 4 or lower, reduce to _______.
1.  8 seconds.

2.  Position 4.

3.  The Next Lower Position.

(ref 5504B)
5. A speed indicator must be accurate within how many MPH while traveling at speeds between 10 and 30 MPH?
3 MPH.

(ref 5403B1)
6. A speed indicator should be accurate within how many MPH while Traveling at speeds above 30 MPH?
5 MPH.

(ref 5403B1)
7. The minimum continuous speed for the locomotive consist is the ____ continuous speed of any of the on-line locomotives in the consist.
Highest.

(ref 5404A)
8. How many POWERED AXLES are considered for an AC locomotive?
9 POWERED AXLES.

(ref 5502A3)
9. TRUE or FALSE:

When making throttle position changes, allow time between changes to allow for in-train forces to adjust.
True.

(ref 5504A1)
10. Any time the locomotive is left standing, in what position must the INDEPENDENT BRAKE be placed?
FULL APPLICATION.

(ref 5505A)
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.

(ref 5505A)
12. The INDEPENDENT BRAKE should be ACTUATED for how many seconds for each locomotive in the consist to make sure brakes are released on the train?
4 seconds per locomotive.

(ref 5505B)
13. What are 3 indications that the train's brake system is not charged?
1.  The air flow indicator is reading higher than when previously tested.

2.  Brake pipe pressure on rear car is lower than when previous application was made.

3.  There is a shorter brake pipe exhaust than when system was fully charged.

(ref 5505C)
14. Where should results of a Speed Indicator Accuracy Test be recorded?
On the Locomotive Work Report.

(ref 5403A)
15. When the ____ of the train is passing through turnouts and crossovers, and the DYNAMIC BRAKE AXLE VALUE exceeds ___, do not exceed DYNAMIC BRAKE position ___.

12.

position 4.

(ref 5505D4)
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.

(ref 5505D1)
17. Once tagged, you may continue to use a locomotive for up to ___ following the discovery of it's inoperative DYNAMIC BRAKE status.
30 Calendar Days.

(ref 5505D2)
18. What is the Maximum Dynamic Brake Axle value when all units have Alignment Control Couplers?
24.

(ref 5505D3a)
19. What is the Maximum Dynamic Brake Value of a consist when any locomotive has Coupler Limiting Blocks?
20.

(ref 5505D3a)
20. What is the device called that automatically nullifies the extended range feature when the BRAKE CYLINDER pressure is 15 pounds or greater?
Independent Pressure Switch.

(ref Student Guide 21/23)
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.

(ref Student Guide 21/23)
22. An initial BRAKE PIPE reduction of __ to __ should be made when the system is fully charged.
6 to 8 pounds.

(ref 5505C1)
23. When the BRAKE PIPE system is not fully charged, how much should an initial reduction be made of?
At least 3 pounds greater than the total previous reduction.

(ref 5505C1)
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.

(ref 5404C)
25. What are the 4 steps to cool Traction Motors down?
1.  Stop Movement.

2.  Center the REVERSER.

3.  Set the GENERATOR FIELD SWITCH to OFF.

4.  Place THROTTLE in position 4 for 20 minutes.

(ref 5404D)
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.

(ref 5404C)
27. Can a safety device be CUT OUT or ANNULLED?
No.

(ref 5402A)
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.

(ref 5505C5)

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 Author: Anonymous ID: 257600 Filename: LET Day 8 Quiz Updated: 2014-01-21 02:34:00 Tags: LET Folders: Description: LET Day 8 Quiz Show Answers:

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