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30 Cards in this Set
- Front
- Back
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Which of the following is one of the primary problems associated
with incandescent light bulbs? |
Aging
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Which of the following devices prevents increased current flow
as electric-discharge lamps heat up? |
Ballast
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What is the main drawback of
the older type of sodium lights? |
Poor color quality
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The base of high-intensitydischarge lighting should be maintained below what maximum temperature?
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2. 210°F
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Which of the following procedures will reduce the stroboscopic effect produced by AID lights?
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Connect adjacent lamps to different power phases
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High-intensity mercury-vapor and metal-halide lamps should NOT be
operated if the outer globe is broken, punctured, or missing. |
True
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What special precautions must be taken if HID equipment is installed in a series wiring
circuit? |
Provide protection from high
voltages that occur during hot restarts |
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Fluorescent lamps use what type of interior coating to give off
light? |
Fluorescent lamps use what type of interior coating to give off
light? |
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Ballasts provide which of the following functions?
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Limit current flow through the lamp
. Provide correct voltage to the lamp Provide power factor correction |
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A thermally protected ballast
approved by Underwriter's Laboratories is classified as |
. Class P ballast
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Which of the following devices are used with lamp fixtures to change the quality of light
produced |
1. Reflectors
2. Lenses |
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When HID lighting fixtures are
mounted on poles, the ballasts should be mounted |
1. at the base of each pole
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A constant-current regulator is sized to provide 6.6 amperes of
current to a lighting circuit. If higher amperage is required, which of the following devices are used to increase the current capacity? |
2. Autotransformers
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Which of the following devices
prevents a lamp failure from interrupting the entire series circuit? |
Film-disk cutout
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When you are running conductors over a great distance to supply
streetlights in a parallel circuit, which, if any, of the following is a DISADVANTAGE? |
Excessive voltage drop
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If both conductors of a series lighting circuit are installed
on the same pole, the system is known as what type of circuit? |
Closed-loop
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Insulators that are installed on series streetlighting circuits
should be of what color to distinguish them from those on other distribution circuits? |
White
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On series streetlighting circuits, what size of hard-
drawn copper conductor is normally used? |
No. 6 AWG
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Which of the following factors determines the output voltage rating of a transformer
supplying streetlighting in a parallel circuit? |
Voltage rating of the individual lamps
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What is the basic principle involved in the operation of
a constant-current regulator? |
A balanced lever reacts to
current flowing through its springs |
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Constant-current regulators may be overloaded to what percent
without damage to the regulator? |
10
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Which of the following devices may be installed to relieve constant-current transformers that are slightly overloaded?
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Booster transformers
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To supply 140 1,000-lumen, 6.6-ampere, straight-series lamps, you would need a regulator of what size?
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10 kW
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When the width of a roadway approaches two mounting heights wide, what mounting arrangement
should be used? |
Staggered
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Which of the following statements best describes the information that can be obtained
from a utilization curve? |
he amount of usable light
that actually strikes the area to be lighted |
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Which part of the manufacturer's literature shows the magnitude
and direction of illumination at any point on the roadway surface? |
sofootcandle curve
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The factor used in lighting
calculations to compensate for gradual losses of illumination is known as what kind of factor? |
Maintenance
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Which of the following factors influence(s) the selection of
the luminaire? |
udget constraints 2. Availability 3. Stock levels in the supply
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What must be calculated before the coefficient of utilization
can be determined? |
Amount of wasted light on
the street side 2. Amount of wasted light on the house side |
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The uniformity of illumination is expressed in terms of a ratio
of |
maximum fc/minimum fc
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