Power Distribution Flashcards
Which of the following terms defines a quaintly of light?
Luman
What unique element do high intensity discharge lamps have?
Resistance decreases as the lamp heats up
On the high pressure mercury lamp, what is the inner arc tube constructed from?
Quartz
Which of the following is not a use for Mercury lamps?
Indoor lighting
Which of the following lamps has the highest light producing efficiency?
High pressure sodium lamps
What is he arc tubes constructed of in high pressure sodium lamp?
Alumina ceramic
What type of gas is used in association with the high pressure sodium lamp?
Xenon
What material is used to coat he inside of a fluorescent lamp?
Phosphor
What are the three roadway classifications used in street lighting?
Local, collector, and major
How many different types of selection of luminary patterns are there?
5
The transverse direction is defined as?
Up and down and the length of the road
Luminaire overhang should not exceed what percentage of the mounting height?
25%
The utilization curve shows the amount of light that falls on the roadway?
True
The amount of luminous energy is also know as?
Flux
What does HID stand for?
High intensity discharge lamp
Advantages of HID lamps?
Longer lamp life and more light per watt
There are three basic types of HID lamps used in area lighting?
Mercury lamps, metal Halide lamps, and high pressure sodium lamps.
Within in the HID lamps have 3 electrodes?
One acting as a cathode, anode, and the other as a starting
The arc tube of a Mercury lamp contains a small amount of?
Pure argon gas
Mercury lamps for lighting applications range in wattage from ?
40 to 1000 watts
What watt range is the most popular for Mercury lamps?
175 to 400 watts
Mercury lamps are being replaced with mor efficient?
Metal halide or high pressure sodium lamps
What does a metal halide arc tube made out of?
Quartz
What do metal halide arc tubes contain?
Halide salts
The result of the halide salts increase in efficiency of approximately ______ percent over that of a Mercury lampoon the same wattage, as well as excellent color quality from the arc.
50 percent
High pressure sodium lamp has the highest light producing efficiency of any commercial white light. True or false
True
High pressure sodium lamps are available in sizes from?
35 to 1000 watts
Where is fluorescent lighting needed?
Low level, highly diffused light is desired. Examples club parking lots, outside shopping areas, parks or grass areas.
Fluorescent tube has a coating of material called?
Phosphor
What do ballast in a HID lamp provide?
3 basic functions.
To control lamp current to the proper value
To provide sufficient voltage to the start of the lamp
And to match the lamp voltage to the line voltage.
Ballast are classified into three major categories depending on the basic circuit involved. What are the three?
Non regulating, lead type regulating, and lag type regulating.
The end life characteristics for the Mercury lamp is?
Is a non start condition or low light output
The end life characteristics for the Metal halide lamp is?
Non start condition, ballast can no longer sustain the lamp. Lamp color at the end of life will be warmer (pinker) than that of a new lamp.
The end life characteristics for the high pressure sodium lamp is?
On and off cycling, because of the voltage and ballast
4 basic visual variations in a lamp of a hid lighting systems that indicate a problem.
The lamp does not start
The lamp scale is on and off
The lamp is extra bright
The lamp is dim
IES stands for?
Illuminating engineering society
Streets are classified into three major categories?
Major, collector, and local
What is major defined as?
The part of the roadway system that serves as the principal network for through traffic flow.
What is collector defined as?
Distributor and collector roadways serving traffic between major and local roadways.
What is local defined as?
Roadways used primarily for direct access to residential, commercial, industrial, or other property
Locality or area I’d also defined by three major categories?
Commercial, intermediate, residential.
Unit of luminous intensity is also know as?
Candela
