Signal Practice Test Exam Questions
with Correct Answers
BNSF test procedure TP-104 requires that a shunt fouling circuits shall be tested: -
Answer-Every three months
Shunt foulings are required to be tested frequently because they are: - Answer-not
designed around the closed-loop, fail-safe principle
When inspecting a shunt fouling it is important to insure that there is only one set of long
jumpers (two discrete conductors) connecting the outside rails because, more than one
set will cause: - Answer-a dead section to exist
When testing a shunt fouling circuit, the voltimeter should always be connected across
the: - Answer-main track
According to BNSF test procedures, when a shunt is placed across the turnout rails
anywhere within the fouling, the track circuit voltage should drop to no more than: -
Answer-10% of the normal voltage, and in no case exceed 0.1 volt
At how many points does a shunt have to be placed in order to have a valid test? -
Answer-three
What value of a shunt should be used for testing? - Answer-0.06 ohm
When Inspecting a shunt fouling circuit, a special effort must be made to ensure that
two discrete and physically separate jumper wires connect the: - Answer-open point &
closed point to the stock rail, toe of the frog & heel of the frog to the rail, and two outside
rails of the switch
All fouling jumper wires should be - Answer-clear of ballast in order to facilitate
inspections
All non-insulated joints, within the turnout track of a shunt fouling circuit should be -
Answer-double bonded
Definition of Aspect - Answer-the appearance of a fixed signal conveying an indication
as viewed from the direction of an approaching train
Definition of Indication - Answer-the information conveyed by the aspect of the signal
Definition of Automatic Signal System - Answer-a signal system that functions through
the exercise of inherent powers, rather than having an individual operate it
, Definition of Block - Answer-a length of track of defined limits, the use of which by trains
is governed by block signals, cab signals, or both
Definition of Home Signal - Answer-a roadway signal at the entrance to a route or block
to govern trains in entering and using that route or block
Definition of Intermediate Signal - Answer-a signal that is not located at the entrance to
a route, however, it is located at the entrance to a block
Definition of Distant Signal - Answer-a signal that can only be used in an approach to an
absolute signal which governs movement onto signal territory
When wiring a GRS relay, which relay coil terminal usually is connected to positive
energy? - Answer-the right
The Electro Code 4 receiver performs the function normally accomplished by a -
Answer-Code-responsive track relay
Electro Code 4 is a DC track circuit that is coded at each end to control block signal
locations. It has the advantage of operating without the need for - Answer-Line wire
The application of Code 6 control at an end-of-siding location will cause the Code 1
pulse to lengthen to 600 milliseconds, this removes the vital code from the code
transmission to provide - Answer-quick tumble-down and traffic reversal
Where are codes transmitted between signal locations making it possible to detect a
train and provide broken rail protection - Answer-through the rails
Vital codes are measured from the leading edge of the pulses, which of the following is
considered a non-vital code and is measured by pulse width - Answer-Code 5
The Electro Code system transmits code pulses for approximately - Answer-1.4
milliseconds
How long is each Electro Code control code - Answer-0.115 seconds
Where is the timing of control code values measured - Answer-leading edge of the first
code pulse
Which code provides track status and is also used for synchronizing pulses - Answer-1
What is the maximum amount of pulses transmitted in a transmission time of 1.4
seconds, but may contain 3 pieces of information if Code 5 is added - Answer-2
What code is used for non-vital block occupancy - Answer-5
with Correct Answers
BNSF test procedure TP-104 requires that a shunt fouling circuits shall be tested: -
Answer-Every three months
Shunt foulings are required to be tested frequently because they are: - Answer-not
designed around the closed-loop, fail-safe principle
When inspecting a shunt fouling it is important to insure that there is only one set of long
jumpers (two discrete conductors) connecting the outside rails because, more than one
set will cause: - Answer-a dead section to exist
When testing a shunt fouling circuit, the voltimeter should always be connected across
the: - Answer-main track
According to BNSF test procedures, when a shunt is placed across the turnout rails
anywhere within the fouling, the track circuit voltage should drop to no more than: -
Answer-10% of the normal voltage, and in no case exceed 0.1 volt
At how many points does a shunt have to be placed in order to have a valid test? -
Answer-three
What value of a shunt should be used for testing? - Answer-0.06 ohm
When Inspecting a shunt fouling circuit, a special effort must be made to ensure that
two discrete and physically separate jumper wires connect the: - Answer-open point &
closed point to the stock rail, toe of the frog & heel of the frog to the rail, and two outside
rails of the switch
All fouling jumper wires should be - Answer-clear of ballast in order to facilitate
inspections
All non-insulated joints, within the turnout track of a shunt fouling circuit should be -
Answer-double bonded
Definition of Aspect - Answer-the appearance of a fixed signal conveying an indication
as viewed from the direction of an approaching train
Definition of Indication - Answer-the information conveyed by the aspect of the signal
Definition of Automatic Signal System - Answer-a signal system that functions through
the exercise of inherent powers, rather than having an individual operate it
, Definition of Block - Answer-a length of track of defined limits, the use of which by trains
is governed by block signals, cab signals, or both
Definition of Home Signal - Answer-a roadway signal at the entrance to a route or block
to govern trains in entering and using that route or block
Definition of Intermediate Signal - Answer-a signal that is not located at the entrance to
a route, however, it is located at the entrance to a block
Definition of Distant Signal - Answer-a signal that can only be used in an approach to an
absolute signal which governs movement onto signal territory
When wiring a GRS relay, which relay coil terminal usually is connected to positive
energy? - Answer-the right
The Electro Code 4 receiver performs the function normally accomplished by a -
Answer-Code-responsive track relay
Electro Code 4 is a DC track circuit that is coded at each end to control block signal
locations. It has the advantage of operating without the need for - Answer-Line wire
The application of Code 6 control at an end-of-siding location will cause the Code 1
pulse to lengthen to 600 milliseconds, this removes the vital code from the code
transmission to provide - Answer-quick tumble-down and traffic reversal
Where are codes transmitted between signal locations making it possible to detect a
train and provide broken rail protection - Answer-through the rails
Vital codes are measured from the leading edge of the pulses, which of the following is
considered a non-vital code and is measured by pulse width - Answer-Code 5
The Electro Code system transmits code pulses for approximately - Answer-1.4
milliseconds
How long is each Electro Code control code - Answer-0.115 seconds
Where is the timing of control code values measured - Answer-leading edge of the first
code pulse
Which code provides track status and is also used for synchronizing pulses - Answer-1
What is the maximum amount of pulses transmitted in a transmission time of 1.4
seconds, but may contain 3 pieces of information if Code 5 is added - Answer-2
What code is used for non-vital block occupancy - Answer-5
