Deck 14: Lamps and Ballasts for Lighting

Question 1

Where are low-voltage incandescent lamps used, and what are their characteristics?

Answer 1

In recent years, low-voltage (usually 12-volt) incandescent lamps have become very popular for accent lighting.Many of these lamps are tungsten lamps.They have a small source size.This feature allows precise control of the light beam.A popular size is the MR16, which has a multifaceted reflector diameter of just 2 in.These lamps provide a whiter light than regular incandescent lamps.Common wattage ratings are 20, 37, 50, and 65 watts.When dimming tungsten halogen lamps, a special dimmer is required because of the transformer that is installed to reduce the voltage.The dimmer is installed in the line voltage circuit supplying the transformer.Dimmed lamps will darken if they are not occasionally operated at full voltage.Dimming also changes the color temperature of the lamp.

Question 2

For a fluorescent lamp, the inside of the tube is coated with a phosphor (a fluorescing material), the air is evacuated, and an inert gas plus a small quantity of is released into the tube.

A)hydrogen
B)helium
C)mercury
D)silicon

Answer 2

C

Question 3

LED lighting could be called " lighting."

A)low-state
B)fluid-state
C)solid-state
D)transistor-state

Answer 3

C

Question 4

How do LED lighting systems compare to incandescent lamps in terms of cost?

Question 5

is the ability of the lamp to portray objects as normally as possible.

A)A lumen
B)The Kelvin
C)The color rendering probability
D)Candlepower

Question 6

Lamps are usually selected according to their .

A)size
B)shape
C)voltage rating
D)wattage rating

Question 7

The program includes such things as replacing old style magnetic ballasts with high-efficiency electronic ballasts, controlling lighting with timers and occupation sensors, and replacing low-efficiency appliances with high- efficiency appliances.

A)Energy Star
B)Green Lights
C)Quicksilver
D)Edison

Question 8

What has caused the increase in popularity of compact fluorescent lamps?

Question 9

In the plans for the commercial building, high-efficiency energy-saving fluorescent lighting and LED lighting is used. Very few ____ are used.

A)mercury
B)metal halide
C)fluorescent
D)incandescent lamps

Question 10

A fluorescent lamp with a 30 in its nomenclature indicates it produces light with a color temperature of K, which would provide good rendition to warm colors.

A)30
B)300
C)3000
D)30,000

Question 11

lamps have the lowest efficacy of the HID family, which ranges from 30 lumens per watt for the smaller- wattage lamps to 65 lumens per watt for the larger-wattage lamps.

A)Mercury vapor
B)Metal halide
C)High-pressure sodium
D)Low-pressure sodium

Question 12

is the amount of light received in a unit of time on a unit area at a unit distance from a point source of one candela.

A)Lumen
B)Candlepower
C)Kelvin
D)Illuminance

Question 13

The light-producing element in the incandescent lamp is a wire called the filament.

A)copper
B)tungsten
C)metal halide
D)silver

Question 14

In an inductive circuit with an uncorrected power factor of 40 percent to 60 percent, the power factor can be corrected to within 5 percent of unity by the addition of a(n) .

A)inductor
B)capacitor
C)resistor
D)thyristor

Question 15

Fluorescent lamps can be operated on a circuit if the proper ballasts are used.A ballast for this type of system contains a current-limiting resistor that provides an inductive kick to start the lamp.

A)flashing
B)dimming
C)dc
D)high-frequency

Question 16

A Toxicity Characteristic Leaching Procedure rating means that the lamp has passed tests regarding the toxicity of the lamp.

A)EPA
B)FDA
C)UL
D)NEC

Question 17

Compare and contrast electronic and magnetic ballasts.

Question 18

Instant-start lamps require single-pin bases and are generally called .

A)U-shaped tubes
B)slimline lamps
C)dimmers
D)preheats

Question 19

In lamp designations, PAR means .

A)parabolic reflector
B)parallel filaments
C)parallel reflector
D)partial illumination

Question 20

What is the difference between efficiency and efficacy, and how is this relevant to light sources?