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Acoustical Modeling MCQ

What does "t" represent in the equation?

The frequency of a wave

The speed of a wave

The length of time it takes for a wave to complete a cycle

The amplitude of a wave

Answer

Correct Answer: The length of time it takes for a wave to complete a cycle

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What is the formula for calculating period?

T = 1/f

T = 1/2f

T = 1/f

T = f/1

Answer

Correct Answer: T = 1/f

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What is the difference in time/distance of source energy from reflected energy?

Path length difference

Diffraction

Refraction

Reflection

Answer

Correct Answer: Path length difference

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What is the path length difference?

The difference in time/distance of the source and the receiver.

The angle between the source and the reflector.

The angle between the source and the receiver.

The difference in time/distance of source energy from reflected energy.

Answer

Correct Answer: The difference in time/distance of source energy from reflected energy.

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What is a passive absorber?

A sound absorber that dissipates sound energy as heat.

A sound absorber that amplifies sound energy.

A sound absorber that stores sound energy.

A sound absorber that reflects sound energy.

Answer

Correct Answer: A sound absorber that dissipates sound energy as heat.

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What does "out of phase" mean?

Two unrelated signals offset in time.

Two unrelated signals in the same time.

Two related signals in the same time.

Two related signals offset in time.

Answer

Correct Answer: Two related signals offset in time.

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What is the name given to a frequency spectrum which is one octave wide?

Thirds spectrum

Octave spectrum

Frequency band

Octave band

Answer

Correct Answer: Octave band

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What is an octave band?

A frequency spectrum which is one octave wide

A frequency spectrum which is three octaves wide

A frequency spectrum which is two octaves wide

A frequency spectrum which is four octaves wide

Answer

Correct Answer: A frequency spectrum which is one octave wide

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The audible range is _____ octaves.

10.5

Answer

Correct Answer: 10.5

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What is the range that has the most impact upon speech intelligibility?

2.5 kHz, 5 kHz, 10 kHz and 20 kHz

150 Hz, 550 Hz, 1050 Hz and 2050 Hz

250 Hz, 500 Hz, 1000 Hz and 2000 Hz

25 Hz, 50 Hz, 100 Hz and 200 Hz

Answer

Correct Answer: 250 Hz, 500 Hz, 1000 Hz and 2000 Hz

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NIС class rating is calculated in accordance with what?

ASTM E90

ISO 10135

Classification E 413

ANSI S12.42

Answer

Correct Answer: Classification E 413

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What is the meaning of NIC?

National Institute of Ceramics

Number of isolation classes

Noise isolation class

Noise in calculation

Answer

Correct Answer: Noise isolation class

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What do NC curves help to do?

Compare the noise levels of different rooms.

Determine the best location for a room.

Pinpoint the source of the noise.

Describe a given measured room's ambient noise by a single NC number.

Answer

Correct Answer: Describe a given measured room's ambient noise by a single NC number.

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What does NC stand for?

Noise Cost

Noise Capacity

Noise Cancelling

Noise Criteria

Answer

Correct Answer: Noise Criteria

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What is Pink noise?

Random noise whose spectrum falls at 3 dB per octave

Unwanted sound

A signal used in acoustical measurements

An electrical or acoustical interference

Answer

Correct Answer: Random noise whose spectrum falls at 3 dB per octave

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What is another name for random noise?

Pink noise

Blue noise

Brown noise

White noise

Answer

Correct Answer: Pink noise

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What is a Node (Dead Spot)?

A point or line where maximum air motion takes place

A point or line where minimal air motion takes place.

A gust of wind

An area of high pressure

Answer

Correct Answer: A point or line where minimal air motion takes place.

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What is the "Near Field"?

The area in a room which is in the far vicinity of the sound source.

The area in a room which is in the immediate vicinity of the sound source.

Answer

Correct Answer: The area in a room which is in the immediate vicinity of the sound source.

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What is the elimination of mechanical shorts known as?

Mechanically Coupled

Resilient

Decoupled

Mechanically Decoupled

Answer

Correct Answer: Mechanically Decoupled

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What is the meaning of "mechanically decoupled"?

The addition of mechanical parts

The increase of rigidity

The elimination of mechanical shorts

The removal of flexible materials

Answer

Correct Answer: The elimination of mechanical shorts

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What is an example of a mechanical coupling?

Two objects that are rigidly connected

Air ducts and plumbing

An acoustically isolated room

Two isolated wall partitions are mechanically coupled if rigid electrical conduit is fastened to both walls.

Answer

Correct Answer: Two isolated wall partitions are mechanically coupled if rigid electrical conduit is fastened to both walls.

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What is the definition of MechanicalCoupling?

The space between two moving objects.

To rigidly connect two isolated objects.

A device used to transmit power from one shaft to another.

Connecting two pieces of machinery in order to make them work together.

Answer

Correct Answer: To rigidly connect two isolated objects.

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What is the purpose of Mass Loaded Vinyl?

To create sound

To absorb sound

To reflect sound

To act as a barrier to sound transmission.

Answer

Correct Answer: To act as a barrier to sound transmission.

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What is Mass Loaded Vinyl?

A high density vinyl material that acts as a barrier to sound transmission

A high density vinyl material that does not act as a barrier to sound transmission

A low density vinyl material that does not act as a barrier to sound transmission

A low density vinyl material that acts as a barrier to sound transmission

Answer

Correct Answer: A high density vinyl material that acts as a barrier to sound transmission

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According to the mass law, to increase a wall’s transmission loss by 6 dB, it is necessary to _____ the thickness of the wall.

Quadruple

Double

Halve

Triple

Answer

Correct Answer: Double

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What is the law of physics that states that a material’s ability to reduce the transmission of sound is proportional to its weight?

Ohm's law

Boyle's law

Mass law

Newton's law of universal gravitation

Answer

Correct Answer: Mass law

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What does masking refer to?

The study of plant life

The study of birds

The process by which one sound is used to obscure the presence of another.

The study of ancient civilizations

Answer

Correct Answer: The process by which one sound is used to obscure the presence of another.

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What is a longitudinal wave?

A wave with only one component

A wave that is not transverse

A wave that consists of two perpendicular waves

A wave in which vibrations are in the direction of propagation of sound

Answer

Correct Answer: A wave in which vibrations are in the direction of propagation of sound

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What does the term "Live" mean in reference to rooms with many reflective surfaces?

A condition where sound is enhanced

A condition where sound is amplified

A reverberant acoustical condition

A condition where sound is only heard once

Answer

Correct Answer: A reverberant acoustical condition

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What does LEDE stand for?

Loud end, dead end

Loud end, diffuse end

Live end, diffuse end

Live end, dead end

Answer

Correct Answer: Live end, dead end

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What is the definition of leakage?

Any unwanted sound picked up by (or "leaking" into) a microphone from another instrument or loudspeaker.

A device used to measure the amount of water leakage

When sound from one room is heard in another.

The process of water seeping through cracks or pores

Answer

Correct Answer: Any unwanted sound picked up by (or "leaking" into) a microphone from another instrument or loudspeaker.

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What is late reflection?

Reflected energy that occurs a greater distance away from the source than the speed of sound.

Reflected energy that occurs a greater distance away from the source than an early reflection.

Reflected energy that occurs at the same time as the source.

Reflected energy that occurs a shorter distance away from the source than an early reflection.

Answer

Correct Answer: Reflected energy that occurs a greater distance away from the source than an early reflection.

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What is the purpose of a Kerf?

To provide a level surface at the joint or seam

To cut an acoustical panel

To mount an adjoining panel

To connect and mount an adjoining panel

Answer

Correct Answer: To connect and mount an adjoining panel

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What is an impulse?

A long, sustained, acoustical (or electrical) signal.

A very short, sustained, acoustical (or electrical) signal.

A very short, transient, optical signal.

A very short, transient, acoustical (or electrical) signal.

Answer

Correct Answer: A very short, transient, acoustical (or electrical) signal.

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What is an impaling clip?

A mounting fastener that is a metal plate with tines (prongs or spikes) sticking out of it

A type of screw

A tool used to smooth fabric

A device used to measure air pressure

Answer

Correct Answer: A mounting fastener that is a metal plate with tines (prongs or spikes) sticking out of it

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What is the noise heard as a result of vibrations transferred through the structure of a room called?

Line noise

Impact noise

Continuous noise

Reverberant noise

Answer

Correct Answer: Impact noise

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What does IIC stand for?

International Institute of Ceramics

International Intermodal Center

Impact Isolation Class

Independent Insurance Company

Answer

Correct Answer: Impact Isolation Class

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How are impact isolation class ratings determined?

IIC ratings use fractional numbers

IIC ratings use whole negative numbers

IIC ratings use whole positive numbers

IIC ratings use whole and fractional numbers

Answer

Correct Answer: IIC ratings use whole positive numbers

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What is the cause of "image shift"?

The electrical signals are out of phase with each other

The vertical refresh rate is not incorrect

There is a problem with the horizontal synchronization pulses

Sound dislocated from its correct position

Answer

Correct Answer: Sound dislocated from its correct position

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What does Hertz measure?

The pitch of a sound

The loudness of a sound

The measuring unit of frequency or the speed of vibration of a sound wave

The wavelength of a sound wave

Answer

Correct Answer: The measuring unit of frequency or the speed of vibration of a sound wave

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What is a Helmholtz resonator?

An acoustic guitar body

A perforated cover over a cavity

A reactive, tuned, sound absorber

A sound amplifier

Answer

Correct Answer: A reactive, tuned, sound absorber

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The level of the delayed components contributes to the apparent level of the sound. What is this called?

Reverberation

Haas effect

Doppler Effect

Diffraction

Answer

Correct Answer: Haas effect

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What is the grazing effect?

The way in which sound is produced by the audience

The way in which sound is amplified by the audience

The way in which light is absorbed by the audience

The way in which sound is absorbed by the audience

Answer

Correct Answer: The way in which sound is absorbed by the audience

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What is an acoustical diffraction grating?

A device that produces interference patterns.

A device that produces diffusion of sound.

A device that amplifies sound.

A device that produces holograms.

Answer

Correct Answer: A device that produces diffusion of sound.

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What is the principle used to achieve diffraction of acoustical waves?

Grating

Diffraction

Reflection

Refraction

Answer

Correct Answer: Grating

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What is the word that describes the phenomenon when light is broken into its component colors?

Diffraction

Reflection

Interference

Refraction

Answer

Correct Answer: Diffraction

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How does a GoBo typically prevent microphone leakage?

By absorbing sound waves

By amplifying sound waves

By projecting sound waves

By covering a set of portable dividers with acoustical treatments

Answer

Correct Answer: By covering a set of portable dividers with acoustical treatments

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What is the primary use of a Gobo?

To amplify sound waves

To create a sound barrier

To prevent microphone leakage

To inhibit the propagation of light

Answer

Correct Answer: To prevent microphone leakage

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What are Fletcher-Munson curves?

The equal loudness contours plotted by the researchers Fletcher and Munson.

The average loudness contours plotted by the researchers Fletcher and Munson.

The unequal loudness contours plotted by the researchers Fletcher and Munson.

The weighted loudness contours plotted by the researchers Fletcher and Munson.

Answer

Correct Answer: The equal loudness contours plotted by the researchers Fletcher and Munson.

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What does the term "flat" mean in regards to audio?

An even frequency response in which no frequency is accentuated.

A type of guitar pick

The sound an object makes when it falls && Equalizing sound frequencies.

Answer

Correct Answer: An even frequency response in which no frequency is accentuated.

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What does the term "flat" mean in terms of frequency response?

That all frequencies are accentuated.

That no frequency is attenuated.

That no frequency is accentuated.

That all frequencies are even.

Answer

Correct Answer: That no frequency is accentuated.

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Flanking occurs when a free standing partition size is less than what?

The wavelength of sound to be blocked.

The width of the partition.

The height of the partition

The weight of the partition

Answer

Correct Answer: The wavelength of sound to be blocked.

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Flanking occurs when a free standing partition size is _______.

Dependent on the type of sound being blocked.

The same as the wavelength of sound to be blocked.

Less than the wavelength of sound to be blocked.

More than the wavelength of sound to be blocked.

Answer

Correct Answer: Less than the wavelength of sound to be blocked.

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What is the Flame Spread Index (FSI) of red oak?

100

Answer

Correct Answer: 100

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Which of the following is not an attribute of the Far field?

The amplitude of the sound pressure decreases in the far field.

The distribution of acoustic energy is uniform in the far field.

The wavelength of the sound waves is much shorter in the far field.

The linear dimensions of the source are much greater than the distance from the source.

Answer

Correct Answer: The linear dimensions of the source are much greater than the distance from the source.

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Equalization is the adjustment of timbre achieved by changing the _____ of a signal at different frequencies.

Timing

Decibels

Amplitude

Frequency

Answer

Correct Answer: Amplitude

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What is equalization?

The adjustment of timbre, or tone quality, achieved by changing the amplitude of a signal at different frequencies.

The study of equality

A type of musical instrumen

A form of dance

Answer

Correct Answer: The adjustment of timbre, or tone quality, achieved by changing the amplitude of a signal at different frequencies.

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Which of the following is true about equal loudness contours?

They are a set of curves of equivalent loudness.

The results show that the human eye is less sensitive to sound at the extreme high and low frequencies.

They model the ear's frequency response throughout the audible spectrum.

Answer

Correct Answer: They model the ear's frequency response throughout the audible spectrum.

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What is the definition of an "echo"?

A sound that is produced in a place where it is reverberating

A distinctly discernible reflection, or repetition of a source signal.

A sound produced by a machine

Answer

Correct Answer: A distinctly discernible reflection, or repetition of a source signal.

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What is the quarter-inch bevel also known as?

Eased (edge)

Bevel edge

Edge panel

Edge detail

Answer

Correct Answer: Eased (edge)

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What is an eased edge?

A line on a map

The name of a town in Texas

An acoustical panel edge detail also known as a quarter-inch (¼") bevel.

An optical illusion

Answer

Correct Answer: An acoustical panel edge detail also known as a quarter-inch (¼") bevel.

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What is the correct term for reflected energy that occurs in close proximity to the source?

Reverberation

Early reflection

Late reflection

Echo

Answer

Correct Answer: Early reflection

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What is the decibel?

A unit of loudness

The measuring unit of sound pressure

The sound pressure of a reference sound

A numerical ratio between the sound pressure of a given sound and the sound pressure of a reference sound

Answer

Correct Answer: The measuring unit of sound pressure

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The decay time of a room is the time necessary for the sound to decay_____

45 dB

50 dB

60 dB

30 dB

Answer

Correct Answer: 60 dB

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What is the decay time of a room at a specific frequency?

The time necessary for a sound to decay 50 dB.

The time necessary for a sound to decay 30 dB.

The time necessary for a sound to decay 10 dB.

The time necessary for a sound of that frequency to decay 60 dB.

Answer

Correct Answer: The time necessary for a sound of that frequency to decay 60 dB.

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What is an acoustical condition in which reverberation is absent called?

Dead

Live

Dry

Damp

Answer

Correct Answer: Dead

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What is Damping?

The loss of energy in a vibration system, usually through friction.

The amplification of energy in a vibration system.

The transfer of energy to another object in a vibration system.

The build-up of energy in a vibration system.

Answer

Correct Answer: The loss of energy in a vibration system, usually through friction.

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What is a D-Ring?

A type of dance

A metal mounting device, shaped like a D, used in conjunction with hanger wire to mount baffles.

An astronomical term

A letter in the Greek alphabet

Answer

Correct Answer: A metal mounting device, shaped like a D, used in conjunction with hanger wire to mount baffles.

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What is the purpose of a D-Ring?

To mount baffles

To shape metal

To hold hanger wire

To mount a device

Answer

Correct Answer: To mount baffles

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What is the opposite of constructive interference?

Complete reflection

No reflection

Partial reflection

Destructive interference

Answer

Correct Answer: Destructive interference

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What isColoration?

The reflection of light

A form of abstract art

A branch of physics

A term used to indicate audible alterations to sound due to its environment.

Answer

Correct Answer: A term used to indicate audible alterations to sound due to its environment.

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The Cocktail Party Effect is

The ability to ignore background noise

The ability to make cocktails

The ability to focus on a single talker in a crowd

The ability to read lips

Answer

Correct Answer: The ability to focus on a single talker in a crowd

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What is the result of combining an acoustical signal with a delayed replica of itself?

It results in a smooth curve

Delayed replica of the signal

It does nothing

Constructive and destructive interference that results in peaks and nulls being introduced into the frequency response.

Answer

Correct Answer: Constructive and destructive interference that results in peaks and nulls being introduced into the frequency response.

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What does a comb filter do?

Produces a distortion

Resembles a smooth curve

Introduces peaks and nulls into the frequency response

Delays an acoustical signal

Answer

Correct Answer: Introduces peaks and nulls into the frequency response

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What is a ceiling cloud?

A decorative element hung from the ceiling

An acoustical panel suspended in a horizontal position from ceiling or roof structure

A panel that helps to insulate a room

A type of molding used to finish the edges of a ceiling

Answer

Correct Answer: An acoustical panel suspended in a horizontal position from ceiling or roof structure

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Ceiling Attenuation Class is used to rate a ceiling's _______.

Width

Efficiency as a barrier to airborne sound transmission

Weight

Height

Answer

Correct Answer: Efficiency as a barrier to airborne sound transmission

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What is Ceiling Attenuation Class?

The ability of a ceiling to disperse sound evenly.

The sound rating of a ceiling material

A single-figure rating derived from the normalized ceiling attenuation values.

The percentage of light that is reflected off a ceiling

Answer

Correct Answer: A single-figure rating derived from the normalized ceiling attenuation values.

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What is the destructive interference of two or more sound waves called?

Interference

Cancellation

Superposition

Diffraction

Answer

Correct Answer: Cancellation

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What does the term "bright" usually refer to in regards to listening?

Excessive upper frequency (treble) energy.

Excessive lower frequency (bass) energy.

A feeling of spaciousness and airiness.

A term used to describe equipment that is visually appealing.

Answer

Correct Answer: Excessive upper frequency (treble) energy.

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What is the definition for "break" in the context of sound vibrations?

A soft, short sound

A sudden change in volume

A physical gap in the assembly or construction, which acts to decouple sound vibrations from traveling through a structure.

A device that is used to amplify sound

Answer

Correct Answer: A physical gap in the assembly or construction, which acts to decouple sound vibrations from traveling through a structure.

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What does the term "boomy" usually refer to?

Medium frequency energy

High frequency (treble) energy

Excessive amount of low frequency (bass) energy.

No frequency energy.

Answer

Correct Answer: Excessive amount of low frequency (bass) energy.

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What is the purpose of Block?

To reduce solid sound transmission

To increase solid sound transmission

To increase airborne sound transmission

Reduce airborne sound transmission

Answer

Correct Answer: Reduce airborne sound transmission

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What does "block" mean?

To reduce the intensity of sound waves.

To reduce the speed of sound waves.

To increase airborne sound transmission.

To reduce airborne sound transmission.

Answer

Correct Answer: To reduce airborne sound transmission.

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What is the primary purpose of a Bass Trap?

To emit low frequency waves

To absorb low frequency waves

To reflect low frequency waves

To cancel low frequency waves

Answer

Correct Answer: To absorb low frequency waves

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What is the purpose of a Bass Trap?

To block low frequency sound waves

To absorb low frequency sound waves

To amplify low frequency sound waves

To reflect low frequency sound waves

Answer

Correct Answer: To absorb low frequency sound waves

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Which of the following is true about a barrier?

It is light and porous.

It is liquid.

It is transparent.

It is heavy and dense.

Answer

Correct Answer: It is heavy and dense.

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What is the purpose of a barrier?

To amplify sound

To allow sound

To block sound

To produce sound

Answer

Correct Answer: To block sound

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A device used to inhibit the propagation of sound waves is called a _____.

Baffle

Damper

Blocker

Barrier

Answer

Correct Answer: Baffle

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What is the ambient noise level above which signals must be presented or noise sources measured?

Disruptive noise

Environmental noise

Ignored noise

Background noise

Answer

Correct Answer: Background noise

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What are room resonances associated with?

Reverberation time

Each pair of parallel walls

Modes of a room

Sound pressure levels

Answer

Correct Answer: Each pair of parallel walls

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What are room resonances associated with each pair of parallel walls called?

Axial mode

Cardioid mode

Oblique mode

Tangential mode

Answer

Correct Answer: Axial mode

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What does the "A" in dBA stand for?

A-weighted

Amplitude

Average

Attenuation

Answer

Correct Answer: A-weighted

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Which is correct regarding an audio frequency?

A frequency that falls outside the range of human hearing

A frequency that falls within the range of the human hearing, usually taken as 20 Hz to 20 kHz.

A frequency that falls above the range of human hearing

A frequency that falls below the range of human hearing

Answer

Correct Answer: A frequency that falls within the range of the human hearing, usually taken as 20 Hz to 20 kHz.

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What is the usual range of the human hearing?

2 Hz to 2 kHz

2 Hz to 20 kHz

20 Hz to 20 kHz

20 Hz to 2 kHz

Answer

Correct Answer: 20 Hz to 20 kHz

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What does it mean to Attenuate?

To transmit an acoustical or electrical signal.

To increase the level of an acoustical or electrical signal.

To reduce the level of an acoustical or electrical signal.

To reflect an acoustical or electrical signal.

Answer

Correct Answer: To reduce the level of an acoustical or electrical signal.

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What does the ASTM E 84 test method determine?

The chemical composition of building materials

The flammability of building materials

The surface burning characteristics of building materials

The amount of smoke produced by building materials

Answer

Correct Answer: The surface burning characteristics of building materials

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What does the ASTM E 84 test method evaluate?

Both flame spread and smoke development

Surface burning characteristics

Only smoke development

Only flame spread

Answer

Correct Answer: Both flame spread and smoke development

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What is the definition of articulation?

The study of insects.

A measure of the intelligibility of speech.

The study of ancient cultures.

A form of medical treatment.

Answer

Correct Answer: A measure of the intelligibility of speech.

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True or False: The surface of an anechoic wedge has a total surface area greater than the flat surface it replaces.

True

False

Answer

Correct Answer: True

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What is the name of the phenomenon occurring due to the exposed edges and diffraction of sound energy around perimeters?

Perimeter Effect

Diffraction Effect

Area Effect

Edge Effect

Answer

Correct Answer: Area Effect

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What does analog mean?

Analog representations of sound replicate its waveform, while transferring it through different media.

Audio may be digital or analog.

Digital representations of sound replicate its waveform, while transferring it through different media.

All sound is digital.

Answer

Correct Answer: Analog representations of sound replicate its waveform, while transferring it through different media.

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What is ambient noise?

All pervasive noise associated with a given environment.

A type of music

A sound that is pleasant to the ear

A sound that is loud and interrupting

Answer

Correct Answer: All pervasive noise associated with a given environment.

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What is the residual "room sound" of a listening environment called?

Diffusion

Reflection

Reverberation

Ambience

Answer

Correct Answer: Ambience

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What is Ambience?

The base color of a sound

The technical quality of a recording

The margin of safety around a sound

The residual "room sound" of a listening environment.

Answer

Correct Answer: The residual "room sound" of a listening environment.

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What is the science of the production, control, transmission, reception and effects of sound called?

Physics

Acoustics

Biology

Chemistry

Answer

Correct Answer: Acoustics

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What is the most common type of material used to make acoustical tile?

Fiberglass

Pressed Board

Gypsum

PVC

Answer

Correct Answer: Fiberglass

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What is the main purpose of acoustical tile?

To amplify sound

To block sound

To reflect sound

To absorb sound

Answer

Correct Answer: To absorb sound

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What does a absorption coefficient of 1.0 indicate?

Total reflection

Total absorption

Area Effect

Total transmission

Answer

Correct Answer: Total absorption

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What is the unit of measurement for sound absorption?

Sabin

Mile

Meter

Foot

Answer

Correct Answer: Sabin

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More Acoustical Engineering Subjects

Architectural Acoustics

Noise & Vibration Control

Sound Insulation

Environmental Acoustics

Measurement of Noise

Ear Anatomy

Basic Audiology

Microphones

Acoustic modelling software

Acoustics Design Practicum

Noise Control

Audio Visual System Design

Acoustical and Audio Measurements

Electroacoustics

Psychoacoustics

Musical Acoustics

More Resources

Acoustical Engineering Skill Assessment

Acoustical Engineering PDF

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