IMSA Traffic Signal Technician 1 New Exam With Complete
Solutions 100% Verified
IMSA - ANSWER The International Municipal Signal Association (IMSA) is the oldest
known association of its kind in the world. The organization originated in 1896 and
counts Thomas A. Edison and the Edison Electric Company among its esteemed
members. Today, IMSA certifies tens of thousands of technicians and stands as the
most regarded name in public safety.
Power formula - ANSWER P = I x E
P = Power (watts)
I = current (amps)
E= voltage (volts)
Electric current types - ANSWER DC = direct current - electrons flow in one direction
AC = alternating current - electrons switch directions
Series circuit - ANSWER One string, current consistent at all points, only one path to
flow
Parallel circuit - ANSWER Voltage remains consistent, multiple strings. Traffic signal
indications wired in parallel
Combination - both series and parallel - ANSWER Traffic signal loop detection can be
wired in combination, series, or parallel
Bonding - ANSWER Connected to establish electrical continuity and conductivity.
Ensures they are all continuous on an effective ground fault current path
,EGFCP - ANSWER Effective ground fault current path. The EGFCP helps operate
devices such as circuit breakers and fuses or ground-fault detectors in ungrounded
systems. In grounded systems, it is important to bond the equipment grounding
conductors to the system grounded conductor. Removing paint from contact surfaces
provides better connection / conductivity path (Section 250.12)
Grounding - ANSWER to earth
Wiring diagram: A wiring diagram or circuit diagram is also a map that depicts every
component as a graphical representation and electrical connections within the circuit
for wiring purposes.
What would wiring diagram in signal cabinet show? The Load switch, FTRs, flasher
sockets, field terminals, BIU sockets, all the components of the power distribution panel
and the wiring connections between them
NEMA TS-1 Wiring Diagram - ANSWER How power enters cabinet, exits, and feeds
signal heads
Unit for electrical pressure - ANSWER Volts
Unit for current - ANSWER Amps
Unit for resistance - ANSWER Ohms
Unit for power - ANSWER Watts
Bonding and grounding means to - ANSWER Bond everything to the same electric
potential and then ground it
, Phase - ANSWER A group of controller timing intervals and settings used to control one
movement of traffic at a signalized intersection
Ring - ANSWER A ring consists of two or more sequentially timed and individually
selected conflicting phases so arranged as to occur in an established order. Ring
controls everything
Barrier - ANSWER A reference point in the preferred sequence of a multi-ring controller
in which all rings are interlocked. Aka compatibility line
Concurrent group - ANSWER 1-2-5-6, 3-4-7-8 (barriers divide concurrent groups)
Concurrent phase - ANSWER Can be on with another phase in its concurrent group
Overlap indications must be controlled by - ANSWER Vehicle phase, ped phase, or
another controller command
Four defined NEMA overlaps - ANSWER OL A, OL B, OL C, OL D
Two types of overlaps - ANSWER Parent/child
Independent / timed overlaps
Full actuated - ANSWER Detection provided at all phases
Semi actuated - ANSWER Minor streets and left turns
Pretimed / coordinated - ANSWER Predetermined cycle length regardless of flow. May
be detection
Solutions 100% Verified
IMSA - ANSWER The International Municipal Signal Association (IMSA) is the oldest
known association of its kind in the world. The organization originated in 1896 and
counts Thomas A. Edison and the Edison Electric Company among its esteemed
members. Today, IMSA certifies tens of thousands of technicians and stands as the
most regarded name in public safety.
Power formula - ANSWER P = I x E
P = Power (watts)
I = current (amps)
E= voltage (volts)
Electric current types - ANSWER DC = direct current - electrons flow in one direction
AC = alternating current - electrons switch directions
Series circuit - ANSWER One string, current consistent at all points, only one path to
flow
Parallel circuit - ANSWER Voltage remains consistent, multiple strings. Traffic signal
indications wired in parallel
Combination - both series and parallel - ANSWER Traffic signal loop detection can be
wired in combination, series, or parallel
Bonding - ANSWER Connected to establish electrical continuity and conductivity.
Ensures they are all continuous on an effective ground fault current path
,EGFCP - ANSWER Effective ground fault current path. The EGFCP helps operate
devices such as circuit breakers and fuses or ground-fault detectors in ungrounded
systems. In grounded systems, it is important to bond the equipment grounding
conductors to the system grounded conductor. Removing paint from contact surfaces
provides better connection / conductivity path (Section 250.12)
Grounding - ANSWER to earth
Wiring diagram: A wiring diagram or circuit diagram is also a map that depicts every
component as a graphical representation and electrical connections within the circuit
for wiring purposes.
What would wiring diagram in signal cabinet show? The Load switch, FTRs, flasher
sockets, field terminals, BIU sockets, all the components of the power distribution panel
and the wiring connections between them
NEMA TS-1 Wiring Diagram - ANSWER How power enters cabinet, exits, and feeds
signal heads
Unit for electrical pressure - ANSWER Volts
Unit for current - ANSWER Amps
Unit for resistance - ANSWER Ohms
Unit for power - ANSWER Watts
Bonding and grounding means to - ANSWER Bond everything to the same electric
potential and then ground it
, Phase - ANSWER A group of controller timing intervals and settings used to control one
movement of traffic at a signalized intersection
Ring - ANSWER A ring consists of two or more sequentially timed and individually
selected conflicting phases so arranged as to occur in an established order. Ring
controls everything
Barrier - ANSWER A reference point in the preferred sequence of a multi-ring controller
in which all rings are interlocked. Aka compatibility line
Concurrent group - ANSWER 1-2-5-6, 3-4-7-8 (barriers divide concurrent groups)
Concurrent phase - ANSWER Can be on with another phase in its concurrent group
Overlap indications must be controlled by - ANSWER Vehicle phase, ped phase, or
another controller command
Four defined NEMA overlaps - ANSWER OL A, OL B, OL C, OL D
Two types of overlaps - ANSWER Parent/child
Independent / timed overlaps
Full actuated - ANSWER Detection provided at all phases
Semi actuated - ANSWER Minor streets and left turns
Pretimed / coordinated - ANSWER Predetermined cycle length regardless of flow. May
be detection
