# Building Construction (Lighting Systems)

Approved & Edited by ProProfs Editorial Team
The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.
| By Nefertarylight55
N
Nefertarylight55
Community Contributor
Quizzes Created: 15 | Total Attempts: 7,411
Questions: 15 | Attempts: 203

Settings

.

• 1.

### Unit of light or luminous flux

Explanation
Lumens is the unit of light or luminous flux. Luminous flux refers to the total amount of light emitted by a source, and lumens measure this flux. It is a measure of the perceived brightness of a light source, taking into account the sensitivity of the human eye to different wavelengths of light. The higher the number of lumens, the brighter the light source.

Rate this question:

• 2.

### Amount of lumens falling on an area one square foot one foot away

Explanation
A footcandle is a unit of measurement used to quantify the amount of light illuminating a specific area. It measures the amount of lumens (a unit of luminous flux) falling on an area of one square foot located one foot away from the light source. In other words, it indicates the intensity of light reaching a surface at a specific distance.

Rate this question:

• 3.

### Amound of lumens falling on an area one square meter one meter away

Explanation
Lux is a unit of measurement used to quantify the amount of light that falls on a specific area. It specifically measures the amount of lumens that fall on an area of one square meter, which is located one meter away from the light source. Lux is commonly used to determine the brightness or intensity of light in various settings such as indoor spaces, outdoor environments, and in the field of photography.

Rate this question:

• 4.

### Measuring luminous intensity

Explanation
The unit "candela" is used for measuring luminous intensity, which is the amount of light emitted or reflected from a particular source in a specific direction. It is a base unit of the International System of Units (SI), representing the brightness of a light source as perceived by the human eye. The candela is defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 terahertz and has a radiant intensity in that direction of 1/683 watt per steradian.

Rate this question:

• 5.

### Unit of light intensity

Explanation
Candlepower is a unit of light intensity that measures the amount of light emitted by a source in a specific direction. It is a common unit used to quantify the brightness of light bulbs, flashlights, and other lighting devices. The term "candlepower" originated from the practice of comparing the brightness of a light source to that of a standard candle. Therefore, candlepower is an appropriate unit for measuring light intensity.

Rate this question:

• 6.

### Unit of brightness

Explanation
The unit of brightness is footlambert. Footlambert is a unit used to measure the brightness of a surface, specifically the luminance emitted or reflected by that surface. It is defined as the amount of light emitted or reflected by a surface that is uniformly emitting or reflecting one footlambert of luminance. This unit is commonly used in the field of lighting design and is important in determining the appropriate level of brightness for different lighting applications.

Rate this question:

• 7.

### Lamps composed of a seal glass containing a filament connected at its ends to the contact area in the base, thereby completing an electric circuit.

Explanation
The given answer, "incandescent," is correct because it accurately describes the type of lamps being referred to in the provided statement. Incandescent lamps are composed of a sealed glass bulb that contains a filament. This filament is connected at its ends to the contact area in the base of the lamp, which completes the electric circuit and allows the lamp to produce light through the process of incandescence.

Rate this question:

• 8.

### Complete optical systems in a single bulb. The bulb contais a filament, reflector and lens

Explanation
PAR lamps, also known as Parabolic Aluminized Reflector lamps, are a type of lighting fixture that contain a complete optical system within a single bulb. This system includes a filament, reflector, and lens. The reflector is designed to direct and control the light output, while the lens helps to focus and shape the light beam. R lamps, on the other hand, do not have the same integrated optical system and may not provide the same level of control and precision in light distribution. Therefore, PAR lamps are a more suitable choice when a specific and controlled lighting effect is desired.

Rate this question:

• 9.

### Use a halogen gas cycle to prevent rapid depreciation of the lamp filament and darkening of the transparent envelop

Explanation
The use of a halogen gas cycle in tungsten halogen lamps helps to prevent rapid depreciation of the lamp filament and darkening of the transparent envelope. Halogen gas reacts with the tungsten atoms that evaporate from the filament during operation, forming tungsten halide compounds. These compounds are then transported back to the filament by convection, where they decompose and release tungsten atoms again. This process helps to maintain a stable filament temperature and prevents blackening of the envelope, resulting in a longer lifespan and better performance of the lamp.

Rate this question:

• 10.

### A cylindrical glass tube, sealed at both ends and containing inert gas. built into each end is a cathode which supplies the electrons to start and maintain the mercury arc or gaseous discharge.

Explanation
The given description is referring to a fluorescent light bulb. Fluorescent bulbs consist of a cylindrical glass tube that is sealed at both ends and filled with inert gas, typically mercury vapor. The ends of the tube have cathodes that provide the electrons needed to start and sustain the mercury arc or gaseous discharge. This discharge produces ultraviolet light, which then interacts with the phosphor coating inside the tube to create visible light. Therefore, the correct answer is "fluorescent."

Rate this question:

• 11.

### When electrically excited, produces visible light of characteristically blue-green color

Explanation
Mercury vapor is a substance that, when electrically excited, emits visible light with a blue-green color. This phenomenon is known as fluorescence. The excited electrons in the mercury atoms release energy in the form of photons, which are particles of light. The specific energy levels of the mercury atoms determine the wavelength of the emitted light, resulting in the characteristic blue-green color. This property of mercury vapor is utilized in various applications, such as fluorescent lamps and neon signs.

Rate this question:

• 12.

### Modification of the mercury vapor with an arc of improved color. possesses increased light output, improved color rendition without the use of phosphors and a small source size.

Explanation
Metal halide lamps are a type of high-intensity discharge (HID) lamp that use a mixture of mercury vapor and metal halides to produce light. The given description matches the characteristics of metal halide lamps, such as increased light output, improved color rendition, and a small source size. These lamps are known for their bright white light and are commonly used in applications that require high-quality lighting, such as stadiums, parking lots, and retail stores.

Rate this question:

• 13.

### Newest addition to the HID field. arc tube is made of high-density polycrystalline alumina and contains a mixture of primarily sodium.

Explanation
The given information about the HID field describes the newest addition, which is an arc tube made of high-density polycrystalline alumina and contains a mixture primarily consisting of sodium. Based on this description, the correct answer is High Pressure Sodium.

Rate this question:

• 14.

### Auxiliary equipment for fluorescent and HID lamps which limits the amount of current in the lamp.

Explanation
A ballast is a device used in conjunction with fluorescent and HID lamps to limit the amount of current flowing through the lamp. It helps regulate the electrical current, preventing the lamp from drawing too much power and potentially burning out. The ballast also ensures that the lamp starts and operates properly, providing the necessary voltage to initiate the electrical discharge in the lamp. Without a ballast, the lamp may not function correctly or may be at risk of damage.

Rate this question:

• 15.

### Used where color matching is important, equivalent to a north sky.

Explanation
Daylight is used where color matching is important and is equivalent to a north sky. This suggests that daylight provides a natural and balanced lighting condition that allows accurate color perception and reproduction. The reference to a north sky implies a cool and neutral color temperature, which is often desired in color-critical applications such as photography, design, and printing.

Rate this question:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Sep 20, 2011
Quiz Created by
Nefertarylight55

Related Topics