Illumination and Lighting Principles Quiz

Illumination and Lighting Principles Quiz

University

10 Qs

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Illumination and Lighting Principles Quiz

Illumination and Lighting Principles Quiz

Assessment

Quiz

Engineering

University

Practice Problem

Medium

Created by

Gouthami Reddy

Used 3+ times

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

The unit of luminous flux is:

Lux

Lumen

Candela

Watt

Answer explanation

The unit of luminous flux is the lumen, which measures the total amount of visible light emitted by a source. Lux measures illuminance, candela measures luminous intensity, and watt measures power.

2.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which law states that illumination on a surface is inversely proportional to the square of the distance from the source?

Lambert’s Law

Inverse Square Law

Kirchhoff’s Law

Stefan-Boltzmann Law

Answer explanation

The Inverse Square Law states that the intensity of illumination decreases with the square of the distance from the light source. This principle is fundamental in physics and applies to various fields, including optics.

3.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

The luminous intensity of a source is measured in:

Lumen

Lux

Candela

Foot-candle

Answer explanation

The luminous intensity of a source is measured in candela, which quantifies the amount of light emitted in a particular direction. Lumen measures total light output, lux measures illuminance, and foot-candle is a unit of illuminance as well.

4.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which device is used to measure the total luminous flux emitted by a light source?

Goniophotometer

Lux meter

Spectrometer

Integrating sphere

Answer explanation

An integrating sphere is used to measure the total luminous flux emitted by a light source by capturing all emitted light uniformly, making it the correct choice. Other devices serve different purposes.

5.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which of the following lamps has the highest luminous efficacy?

Tungsten filament lamp

Mercury vapor lamp

Fluorescent tube

LED lamp

Answer explanation

The LED lamp has the highest luminous efficacy among the options, converting a greater percentage of electrical energy into visible light compared to tungsten filament, mercury vapor, and fluorescent lamps.

6.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which of the following correctly matches the lamp type with its characteristic?

Tungsten filament – long life, high efficiency

Fluorescent lamp – flicker-free, no starter needed

Mercury vapor lamp – requires warm-up time

LED lamp – uses gas discharge

Answer explanation

The mercury vapor lamp requires warm-up time to reach full brightness, making this characteristic accurate. The other options incorrectly describe their respective lamp types.

7.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which of the following is a polar curve used in lighting design?

A plot showing color spectrum of light

A curve showing temperature vs. time

A plot of luminous intensity in various directions

A graph of voltage vs. current for a lamp

Answer explanation

The correct choice is a plot of luminous intensity in various directions, as it represents how light is distributed in space, which is essential in lighting design. Other options do not focus on directional light intensity.

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