BNSF SESSION 4 EXAM QUESTIONS
WITH COMPLETE SOLUTIONS
Most light units are changed upon failure. List those units: - Answer-1. Power off
Indicators
2. Highway grade crossing warning systems
3. Wayside signals with automatic downgrades
What light unit is changed even if it is still working and how often? - Answer-Wayside
signals without automatic downgrades (every two years)
Where is the one spot that a 25W bulb can never be used? - Answer-Gate arm lights
Is 8.8V to 9.2v acceptable voltage rang for highway grade crossing warning signals? -
Answer-Yes (Not less than 8.5 volts or 85% of the rated voltage)
Which hump yard signal governs train movement from the bowl area to the hump crest?
- Answer-Trim signals
How must the optics in a track side infrared scanner be cleaned? - Answer-With a soft
cloth and anti-fog cleaning solution, water, or manufacturer recommendation
Test of movable rails for surface should be made insuring each rail seat shows whether
or not the rail can be locked or, if electrically checked. whether or not circuit controller
contacts are opened by what obstruction gage and where? - Answer-3/8 on each rail
seat
PTC was designed to prevent and protect certain key pieces what will PTC specifically
protect? - Answer-Roadway workers
What is the temperature of an Absolute alarm according to the detector settings? -
Answer-170 degree
There are three processes that have to be accomplished before an interlocked signal
may display a proceed aspect for a movable bridge. What are the three processes? -
Answer-1. Bridge must be seated then locked
3. moveable rail must be determined to be in proper surface and alignment with the rails
on the abutment or fixed span
4. derails if any must be placed in non-derailing postion
What is considered as the proper coupling speed in the bowl of a hump yard? - Answer-
3-4 MPH
, What is the main function preformed by the process control portion of the yard
computer? - Answer-Route humped cars to the proper class track at the proper coupling
speed
Signal and track employees have four responsibilities outlined in EI-25, what are they? -
Answer-Install, maintain, report and perform audits on signal assets
What is the recommended distance from magnetic center to magnetic center for
transducers? - Answer-24"
When is the bridge considered to be properly locked? - Answer-When its within 1" of
fully driven
At what temperature for an integrity test does a train get an integrity failure? - Answer-0-
100 degrees
PTC was designed to prevent what four key pieces? - Answer-1. Train on Train collision
2. Overspeed derailments
3. movement of a train through an improperly lined switch
4. Train movement past authority limits
There are 5 types of rail joints for movable bridges, what are they? - Answer-1. Mitered
2. Fixed easer
3. Sliding easer
4. Conley 2 piece
5. Conley 3 piece
There are four main components that are required for PTC, what are they? - Answer-1.
Office
2. Communication
3. Locomotive
4. Wayside
There are three types of hardware required for communication of the PTC system, what
are they? - Answer-1. Radio
2. WIU
3. IMG
What is the name of the mechanical device that controls the speed of a car coming of
the crest and rolling towards the bowl tracks? - Answer-Master Retarder
All bridges are tested for locking how often? - Answer-1 year
What is the recommended distance for transducers from top rail? - Answer-1 3/4 +/- 1/8
WITH COMPLETE SOLUTIONS
Most light units are changed upon failure. List those units: - Answer-1. Power off
Indicators
2. Highway grade crossing warning systems
3. Wayside signals with automatic downgrades
What light unit is changed even if it is still working and how often? - Answer-Wayside
signals without automatic downgrades (every two years)
Where is the one spot that a 25W bulb can never be used? - Answer-Gate arm lights
Is 8.8V to 9.2v acceptable voltage rang for highway grade crossing warning signals? -
Answer-Yes (Not less than 8.5 volts or 85% of the rated voltage)
Which hump yard signal governs train movement from the bowl area to the hump crest?
- Answer-Trim signals
How must the optics in a track side infrared scanner be cleaned? - Answer-With a soft
cloth and anti-fog cleaning solution, water, or manufacturer recommendation
Test of movable rails for surface should be made insuring each rail seat shows whether
or not the rail can be locked or, if electrically checked. whether or not circuit controller
contacts are opened by what obstruction gage and where? - Answer-3/8 on each rail
seat
PTC was designed to prevent and protect certain key pieces what will PTC specifically
protect? - Answer-Roadway workers
What is the temperature of an Absolute alarm according to the detector settings? -
Answer-170 degree
There are three processes that have to be accomplished before an interlocked signal
may display a proceed aspect for a movable bridge. What are the three processes? -
Answer-1. Bridge must be seated then locked
3. moveable rail must be determined to be in proper surface and alignment with the rails
on the abutment or fixed span
4. derails if any must be placed in non-derailing postion
What is considered as the proper coupling speed in the bowl of a hump yard? - Answer-
3-4 MPH
, What is the main function preformed by the process control portion of the yard
computer? - Answer-Route humped cars to the proper class track at the proper coupling
speed
Signal and track employees have four responsibilities outlined in EI-25, what are they? -
Answer-Install, maintain, report and perform audits on signal assets
What is the recommended distance from magnetic center to magnetic center for
transducers? - Answer-24"
When is the bridge considered to be properly locked? - Answer-When its within 1" of
fully driven
At what temperature for an integrity test does a train get an integrity failure? - Answer-0-
100 degrees
PTC was designed to prevent what four key pieces? - Answer-1. Train on Train collision
2. Overspeed derailments
3. movement of a train through an improperly lined switch
4. Train movement past authority limits
There are 5 types of rail joints for movable bridges, what are they? - Answer-1. Mitered
2. Fixed easer
3. Sliding easer
4. Conley 2 piece
5. Conley 3 piece
There are four main components that are required for PTC, what are they? - Answer-1.
Office
2. Communication
3. Locomotive
4. Wayside
There are three types of hardware required for communication of the PTC system, what
are they? - Answer-1. Radio
2. WIU
3. IMG
What is the name of the mechanical device that controls the speed of a car coming of
the crest and rolling towards the bowl tracks? - Answer-Master Retarder
All bridges are tested for locking how often? - Answer-1 year
What is the recommended distance for transducers from top rail? - Answer-1 3/4 +/- 1/8
