2-6-14 Introduction to Traffic Signal Cabinets and Equipment Flashcards
In 1976, __?__ released a set of traffic signal standards known as TS-1.
NEMA
What device in the cabinet switches the 120 VAC output to the signal heads?
load switches
All of the traffic signal components are housed in a weathertight cabinet.
Trure
A Type 2 controller cannot be used in a TS-1 cabinet.
False
The two categories of AC and DC voltage levels are input voltage and __?__ voltage.
output
The most popular choice for methods of vehicle detection is a __?__.
inductive loop detector
A flash __?__ relay is used to switch the signals from a normal operating condition to a flashing condition
transfer
The key to the success of the 170 controller is because it specifies which __?__ to use.
microprocessor chip
The key to the success of the 170 controller is because it specifies which __?__ to use.
protocol
A Type 2 dual-circuit output flasher plugs into a __?__ socket.
6-pin
The channels display on the conflict monitor tells __?__ the problem occurred.
where
One problem with electro-mechanical controllers is that signals would become stuck due to the dial unit not turning in __?__ weather.
cold
Who is credited with providing the concept for today’s four-way traffic signal?
Garrett A. Morgan
The electro-mechanical controllers made by different manufacturers all operate on the same principle.
True
Where did the world’s first traffic signal become operational?
London
The controller holds all the configuration and timing parameters for each vehicle __?__.
phase
Logic circuits operate on 0 VDC or __?__ VDC for pedestrian push buttons.
12
Interface requirements for the cabinet to the controller are defined by __?__.
NEMA
A flasher has two LED’s on the front to indicate the input status of the controller.
False
A NEMA cabinet that measures 30W x 16D x 48H would be defined by the letter __?__.
M
A __?__ provides the interface between the 170 controller and the 170 cabinet facilities.
C1 connector
In a pedestal mounted 170 cabinet, the back door allows access to the power distribution assembly.
False
The 170 controller can be used to control variable message signs.
True
