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Measurement of Noise MCQ

What is the name of the 1:1 Octave Band Filter?

Octave Band

Octave Band MF

Octave Band HF

Octave Band LF

Answer

Correct Answer: Octave Band LF

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What is the name of the Octave Band that is shown graphically?

1:1 Octave Band

4:1 Octave Band

3:1 Octave Band

2:1 Octave Band

Answer

Correct Answer: 1:1 Octave Band

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What does the 1:1 Octave Band Filter do?

It minimizes the noise.

It shows the numerical value of the frequency of the noise.

It amplifies the noise.

It shows the numerical value of noise when an instrument is measuring noise.

Answer

Correct Answer: It shows the numerical value of noise when an instrument is measuring noise.

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What is Octave Band Leq,t?

The type of noise an instrument makes

The amount of noise an instrument makes

The frequency of noise an instrument makes

The 1:1 Octave Band Filters shown graphically when an instrument is measuring noise.

Answer

Correct Answer: The 1:1 Octave Band Filters shown graphically when an instrument is measuring noise.

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What is the purpose of an Octave Band Filter?

To reduce the overall level of noise

To find the pitch of a noise

To measure noise without frequency weighting

To measure the loudness of a noise

Answer

Correct Answer: To measure noise without frequency weighting

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What does Octave Band Leq,1s refer to?

The 2:1 Octave Band Filters shown numerically without frequency weighting.

The 1:1 Octave Band Filters shown numerically without frequency weighting.

The 1:2 Octave Band Filters shown numerically without frequency weighting.

The 1:1 Octave Band Filters shown with frequency weighting.

Answer

Correct Answer: The 1:1 Octave Band Filters shown numerically without frequency weighting.

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What is the frequency range split into sections called?

Octave Band Filters

Hertz

Amplitude

Decibel

Answer

Correct Answer: Octave Band Filters

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What is the ratio of an octave?

3:4

1:2

2:1

2:3

Answer

Correct Answer: 2:1

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What is the interval between two frequencies having a ratio of 2:1 called?

Tone

Unison

Octave

Semitone

Answer

Correct Answer: Octave

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What is occupational hearing loss?

Hearing loss that occurs when exposure to hazards such as noise occur at a restaurant.

Hearing loss that occurs when exposure to hazards such as noise occur at home.

Hearing loss that occurs when exposure to hazards such as noise occur at school.

Hearing loss that occurs when exposure to hazards such as noise occur at work.

Answer

Correct Answer: Hearing loss that occurs when exposure to hazards such as noise occur at work.

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What is the NR of a sound pressure level if it intersects with the ordinate at 1kHz?

There is no NR for a sound pressure level if it intersects with the ordinate at 1kHz.

It is numerically equal to the sound pressure level at the intersection with the ordinate at 1kHz.

It is numerically equal to the sound pressure level at the intersection with the ordinate at 1Hz.

The NR of a sound pressure level can't be determined from the information given.

Answer

Correct Answer: It is numerically equal to the sound pressure level at the intersection with the ordinate at 1kHz.

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What is the NR at the sound pressure level of the intersection with the ordinate at 1Hz?

Noise rating is numerically equal to the sound pressure level at the intersection with the ordinate at 1Hz.

The noise rating is equal to the sound pressure level at the intersection with the ordinate, but only at 1kHz.

The noise rating is not numerically equal to the sound pressure level at the intersection with the ordinate at 1Hz.

There is no NR at the sound pressure level of the intersection with the ordinate at 1Hz.

Answer

Correct Answer: Noise rating is numerically equal to the sound pressure level at the intersection with the ordinate at 1Hz.

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How can Noise-Induced Hearing Loss occur?

Only from social exposure

Only from recreational exposure

Only from occupational exposure

Gradually from chronic exposure, or suddenly from a short high-intensity noise

Answer

Correct Answer: Gradually from chronic exposure, or suddenly from a short high-intensity noise

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Which of the following is a cause of Noise-Induced Hearing Loss?

Drinking alcohol

Exposure to loud sound

Eating too much sugar

Not getting enough sleep

Answer

Correct Answer: Exposure to loud sound

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What is Noise-Induced Hearing Loss?

A hearing impairment that occurs from exposure to loud sound and movement

A hearing impairment that occurs from exposure to loud light

A hearing impairment that occurs from exposure to loud sound and light

A hearing impairment that occurs from exposure to loud sound

Answer

Correct Answer: A hearing impairment that occurs from exposure to loud sound

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What is the full form of NC?

Noisy Child

Network Criteria

Noise Criteria

Not Conclusive

Answer

Correct Answer: Noise Criteria

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What does NC stand for in noise criteria?

Noisy Children

Noise Criteria

Noise Cancellation

Standard spectrum curves

Answer

Correct Answer: Standard spectrum curves

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What is noise floor?

The self-generated noise of a sound level meter, usually due to the microphone or pre-amplifier.

The highest level of noise that can be recorded by the sound level meter.

The noise generated by the sound source.

The level below which the meter cannot read.

Answer

Correct Answer: The self-generated noise of a sound level meter, usually due to the microphone or pre-amplifier.

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What is noise?

Sound of a specific pitch that is originated by the vibration of an object

Sound which is not desired by the recipient.

A device that producessound.

Answer

Correct Answer: Sound which is not desired by the recipient.

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What is the frequency of a free vibration?

Natural frequency

Vibrational frequency

Angular frequency

Circular frequency

Answer

Correct Answer: Natural frequency

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What is natural frequency?

The number of times per second that an object vibrates

Free vibration

Vibration of a system when no outside forces act on it.

The vibration set up in an elastic body by a system of periodic or shock forces.

Answer

Correct Answer: Free vibration

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What are axial modes?

Room resonance associated with all six surfaces

Room resonance associated with pairs of parallel walls

Room resonance associated with pairs of adjacent walls

Room resonance associated with four room surfaces

Answer

Correct Answer: Room resonance associated with pairs of parallel walls

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What converts acoustic pressure into an electrical signal?

Receiver

Amplifier

Microphone

Microphone capsule

Answer

Correct Answer: Microphone capsule

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What causes the maximum absorption to occur in a membrane absorber?

Trapped layer of air

Superficial weight of the panel

Frequency

Spacing panel to backing

Answer

Correct Answer: Superficial weight of the panel

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What does Lmax refer to?

Minimum noise level during a measurement period or noise event.

Maximum noise level during a measurement period or noise event.

The average noise level during a measurement period or noise event.

The zero noise level during a measurement period or noise event.

Answer

Correct Answer: Maximum noise level during a measurement period or noise event.

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What is the maximum noise level during a measurement period or noise event called?

Maximum Sound Silence

Maximum Sound Level

Noon Sound Level

Minimum Sound Level

Answer

Correct Answer: Maximum Sound Level

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What is the effect of masking?

The threshold of audibility of a sound is raised by the presence of another (masking) sound or sounds.

The threshold of audibility of a sound is lowered by the presence of another (masking) sound or sounds.

Masking is ineffective when the masking sound is of lower frequency than the sound to be masked.

Masking using white noise is always used as an aid to communication in offices.

Answer

Correct Answer: The threshold of audibility of a sound is raised by the presence of another (masking) sound or sounds.

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LAF stands for ______

Slow Time weighting

Fast Time weighting

Sound Level with A Frequency weighting

'A' Frequency weighting

Answer

Correct Answer: Sound Level with A Frequency weighting

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LAFmin stands for:

The minimum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

The minimum Sound Level with ‘A’ Frequency weighting and Slow Time weighting during the measurement period.

The minimum Sound Level with ‘C’ Frequency weighting and Slow Time weighting during the measurement period.

The maximum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

Answer

Correct Answer: The minimum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

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What does LAFmax stand for?

The maximum Brightness level with 'A' frequency weighting and slow time weighting during the measurement period.

The maximum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

The maximum Sound Level with 'C' frequency weighting and Fast Time weighting during the measurement period.

The minimum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

Answer

Correct Answer: The maximum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

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LAE is an abbreviation for which phrase?

Sound Exposure Level

Sensorineural Hearing Loss

Service- connected hearing loss

Sudden sensorineural hearing loss

Answer

Correct Answer: Sound Exposure Level

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What does L90 represent?

The highest noise level

The noise level exceeded for 90% of the time

The average noise level

The lowest noise level

Answer

Correct Answer: The noise level exceeded for 90% of the time

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What does the L50 value represent?

The median of the fluctuating noise levels

The highest noise level

The minimum noise level

The average of all noise levels

Answer

Correct Answer: The median of the fluctuating noise levels

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What is the L50 value?

The level exceeded for 10% of the time.

The level exceeded for 75% of the time.

The level exceeded for 50% of the time.

The level exceeded for 90% of the time.

Answer

Correct Answer: The level exceeded for 50% of the time.

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What does L10 represent?

The level exceeded for 10% of the time.

The level exceeded for 20% of the time.

The level exceeded for 5% of the time.

The level exceeded for 15% of the time.

Answer

Correct Answer: The level exceeded for 10% of the time.

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What does L10 refer to?

The average sound pressure level

The sound pressure level exceeded for 2% of the time

The sound pressure level exceeded for 90% of the time

The sound pressure level exceeded for 10% of the time

Answer

Correct Answer: The sound pressure level exceeded for 10% of the time

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What is the full form of ISO?

International Organization for Science

International Organization for Standardisation

International Organization for Solving

International Organization of Standardisation

Answer

Correct Answer: International Organization for Standardisation

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What does ISO stand for?

International Organization for Service

International Organization for Suppliers

The International Organization for Standardisation

International Organization of Industries

Answer

Correct Answer: The International Organization for Standardisation

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What does an Integrating Averaging Sound Level Meter do?

Converts sound energy into electrical energy

Accumulates the total sound energy over a measurement period and calculates an equivalent average value

Stores sound energy

Amplifies sound energy

Answer

Correct Answer: Accumulates the total sound energy over a measurement period and calculates an equivalent average value

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What is impulse?

It is a frequency weighting which determines the 'level' at which and instrument responds to changing noise levels

It is a frequency weighting which determines the 'speed' at which and instrument responds to changing noise levels

It is a time weighting which determines the 'level' at which and instrument responds to changing noise levels

It is a time weighting which determines the 'speed' at which and instrument responds to changing noise levels

Answer

Correct Answer: It is a time weighting which determines the 'speed' at which and instrument responds to changing noise levels

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What does IEC stand for?
A: International Electro-technical Commission
B: International Energy Commission
C: Intergovernmental Economic Commission

Intergovernmental Economic Commission

International Electro-technical Commission

International Energy Commission

Answer

Correct Answer:

International Electro-technical Commission

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Which of the following is NOT true about IEC standards?

While the USA is a full member of IEC, in acoustics they usually take much regard to them.

IEC standards describe the instrument’s performance NOT its method of use.

IEC – The International Electro-technical Commission sets and agrees the world standards for many things

Answer

Correct Answer: IEC standards describe the instrument’s performance NOT its method of use.

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A Helmholtz Resonator is named after which German physicist?

Johann Wolfgang von Goethe

Robert Bunsen

Hermann von Helmholtz

Max Planck

Answer

Correct Answer: Hermann von Helmholtz

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How does a Helmholtz resonator work?

It powers electric devices

It emits sound

It amplifies sound

A reactive, tuned, sound absorber

Answer

Correct Answer: A reactive, tuned, sound absorber

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What is the unit of frequency?

Seconds

Minutes

Hours

Hertz

Answer

Correct Answer: Hertz

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What is the hearing threshold level?

The loss of hearing over time

A measure of loudness

A condition that causes deafness

A measured threshold of hearing, expressed in decibels relative to a specified standard of normal hearing.

Answer

Correct Answer: A measured threshold of hearing, expressed in decibels relative to a specified standard of normal hearing.

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What is hearing loss?

The increase of a person's hearing levels above the specified standard of normal hearing.

Autism

Alzheimer's disease

The decrease of a person's hearing levels below the specified standard of normal hearing.

Answer

Correct Answer: The decrease of a person's hearing levels below the specified standard of normal hearing.

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How may frequency be expressed?

Cps

Minutes

Hz, kHz, or MHz

Seconds

Answer

Correct Answer: Hz, kHz, or MHz

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Free field microphones are designed to do what?

Compensate for the effect of a standard half-inch microphone

Only work with special sound equipment

Only measure sound at frequencies below 1kHz

Give a more accurate representation of sound at all frequencies

Answer

Correct Answer: Compensate for the effect of a standard half-inch microphone

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For which frequencies is a free field microphone designed?

Below 1kHz

1kHz and above

2kHz and above

1.5kHz and above

Answer

Correct Answer: 1kHz and above

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Which of the following is true about acoustic energy?

Acoustic energy cannot be reflected from concave surfaces.

Acoustic energy can be reflected from concave surfaces into a concentrated focus.

Reflecting acoustic energy does not require a medium.

Acoustic energy can be reflected from convex surfaces into a concentrated focus.

Answer

Correct Answer: Acoustic energy can be reflected from concave surfaces into a concentrated focus.

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What is the effect of focusing acoustic energy from a concave surface?

The acoustic energy is absorbed by the concave surface.

The acoustic energy is scattered in all directions.

The acoustic energy is reflected into a concentrated focus.

The acoustic energy is reflected in a diffused manner.

Answer

Correct Answer: The acoustic energy is reflected into a concentrated focus.

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Flanking occurs when sound energy _____.

Bypasses a sound barrier at the edges

Is reflected by a sound barrier at the edges

Is transmitted down the walls or ducts

Is absorbed by a sound barrier at the edges

Answer

Correct Answer: Bypasses a sound barrier at the edges

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By-passing of a sound barrier at the edges is known as _______.

Diffraction

Flanking

Reflection

Attenuation

Answer

Correct Answer: Flanking

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What does time weighting affect?

Time of day

The amount of noise

The weight of the person

Sound Level, Maximum Sound Level and Minimum Sound Level

Answer

Correct Answer: Sound Level, Maximum Sound Level and Minimum Sound Level

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Which of the following is not a time weighting?

LAFmax

LAFmin

LAF

LAeq

Answer

Correct Answer: LAFmax

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What is the unit of sound level?

Bel

Sones

Phons

Answer

Correct Answer: DB

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What is LEP,d?

The length of time an individual is exposed to noise

The equivalent sound pressure level for continuous noise over a nominal eight-hour working day

The sound pressure level to which a person is exposed over a given time period

The total time that an individual is exposed to noise over their lifetime

Answer

Correct Answer: The equivalent sound pressure level for continuous noise over a nominal eight-hour working day

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What is the actual time that an individual is exposed to noise called?

Loudness

Stress Time

Exposure Time

Trauma Time

Answer

Correct Answer: Exposure Time

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What does "Pa2h" stand for in the context of exposure?

Pascal Seconds

Pascal Squared Hours

Poiseuille Second

Pounds per Square Inch

Answer

Correct Answer: Pascal Squared Hours

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What is the unit of measurement for exposure?

Pa2h

DBA

PPH

Answer

Correct Answer: Pa2h

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In the UK, what is the LAeq always based on?

British Summer Time

The Greenwich Mean Time

An Exchange Rate (or Q) of 3dB

An Exchange Rate (or Q) of 5dB

Answer

Correct Answer: An Exchange Rate (or Q) of 3dB

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What is the UK LAeq based on?

OSHA use an Exchange rate of 5dB

LAeq is always based on an Exchange Rate of 3dB

Exchange Rate (Q) of 5dB

Exchange Rate (Q) of 3dB

Answer

Correct Answer: Exchange Rate (Q) of 3dB

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What does "Estimated dose" refer to?

The projected noise exposure for an 8 hour time period

The actual noise exposure for an 8 hour time period

The actual noise exposure for a 24 hour time period

The projected noise exposure for a 24 hour time period

Answer

Correct Answer: The projected noise exposure for an 8 hour time period

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What doesLeq measure?

The sound pressure during a stated time interval

The root-mean-square sound pressure during a stated time interval

The average level of noise

The amount of noise from the beginning of the measurement

Answer

Correct Answer: The root-mean-square sound pressure during a stated time interval

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What is the more common name for "time-average sound level"?

LAeq

LAS

LAT

LAeqT

Answer

Correct Answer: LAeqT

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What is the common abbreviation for "Equivalent Continuous Level"?

LAeqT

Laeq

Leq

LAT

Answer

Correct Answer: Leq

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What does ELC stand for?

Every Lizard's Capacity

Excluded Lowest Consecutive

Equal Loudness Contour

Earth's Luminous Center

Answer

Correct Answer: Equal Loudness Contour

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Which of the following is not a property of an echo?

Reflected sound heard as separate from the initial sound

Louder than the initial sound

At the same frequency as the initial sound

Softer than the initial sound

Answer

Correct Answer: Reflected sound heard as separate from the initial sound

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What is an Echo?

The Reflected sound heard as separate from the initial sound, by virtue of the longer reflected sound path.

The loudness of a sound

A sound that is produced by the reflection of sound waves from a hard surface

A measure of the quality of sound

Answer

Correct Answer: The Reflected sound heard as separate from the initial sound, by virtue of the longer reflected sound path.

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What noise limited the range of levels instruments can accurately measure?

Inherent noise

Distortion

Resonance

Overload

Answer

Correct Answer: Inherent noise

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What is the dynamic range of an instrument?

The usable region between the inherent noise at low levels and the overload at high levels, expressed in dB.

The difference in level between the lowest and the loudest that an instrument can measure.

The loudest level an instrument can measure.

Answer

Correct Answer: The usable region between the inherent noise at low levels and the overload at high levels, expressed in dB.

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What is a noise dosemeter?

A device used to measure X-rays

A machine that measures noise levels in a workplace

A portable, wireless, personal noise exposure meter

A machine that analyses a person's DNA

Answer

Correct Answer: A portable, wireless, personal noise exposure meter

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What is the cause of diffusion?

Volume

Surface area

Reflecting surface or surfaces

Sound waves

Answer

Correct Answer: Reflecting surface or surfaces

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What is the definition of Diffusion?

The movement of particles from an area of high concentration to an area of low concentration.

The absorption of sound waves by a surface.

The reflection of sound waves off a surface.

When reflecting surface or surfaces cause a dispersion of sound in a room, with no directionality of sound waves.

Answer

Correct Answer: When reflecting surface or surfaces cause a dispersion of sound in a room, with no directionality of sound waves.

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What is the ability of a sound wave to pass round a screen or barrier called?

Diffusion

Reflection

Refraction

Diffraction

Answer

Correct Answer: Diffraction

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What is a diaphragm?

A measure of the loudness of sound

Any surface that vibrates in response to sound or is vibrated to emit sound

The study of sound and its propagation

A device used to clean water

Answer

Correct Answer: Any surface that vibrates in response to sound or is vibrated to emit sound

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What is the symbol for decibel?

DBP

DBA

DBm

Answer

Correct Answer: DB

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Decibel and Bel are which of the following?

Imperial units

Not units

SI units

Wraps

Answer

Correct Answer: Not units

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What does LEP,d represent?

Level of Exposure to Noise

Daily Personal Noise Exposure

Light Exposure Protection

Loudness Exposure Percentage

Answer

Correct Answer: Daily Personal Noise Exposure

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What is the 8 hour average level of noise exposure calculated from the percentage dose written as?

Percentage dose

LEP,8h

LEP,d or LEX,8h

LEX,8h

Answer

Correct Answer: LEP,d or LEX,8h

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What is the process whereby the amplitude of an oscillation of a system is diminished due to thermodynamically or other irreversible processes called?

Resonance

Damping

Amplification

Oscillation

Answer

Correct Answer: Damping

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What is the "metric" that a sound level meter gives when on A-frequency-weighting network?

DB(C)

DB(F)

DB(A)

DB(Z)

Answer

Correct Answer: DB(A)

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What is the definition of cycle?

The sequence of changes which takes place during the period of a fixed quantity.

The sequence of changes which takes place during the period of a non-recurring variable quantity.

The sequence of changes which takes place during the period of a quantity.

The sequence of changes which takes place during the period of a recurring variable quantity.

Answer

Correct Answer: The sequence of changes which takes place during the period of a recurring variable quantity.

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What is the Criterion Time?

The lowest permissible exposure to noise

The maximum permissible exposure to noise

The time over which noise meters calculate exposure and dose values.

The recommended exposure to noise

Answer

Correct Answer: The time over which noise meters calculate exposure and dose values.

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What is the maximum Leq sound level allowed over an 8 hour time period which corresponds to the 100% dose in the UK?

85dB

86dB

88dB

84dB

Answer

Correct Answer: 85dB

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What is critical frequency?

Highest frequency when beats occur

Lowest frequency when beats occur

Lowest frequency when coincidence occurs

None of the above

Answer

Correct Answer: Lowest frequency when coincidence occurs

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What does critical frequency refer to?

Highest frequency when coincidence occurs.

Lowest frequency when coincidence occurs.

Frequency that produces the least sound.

Frequency that produces the loudest sound.

Answer

Correct Answer: Lowest frequency when coincidence occurs.

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IEC 61672 divides sound level meters into which classes?

2 classes

5 classes

7 classes

3 classes

Answer

Correct Answer: 2 classes

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Which of the following is NOT a performance category of a sound level meter?

Class 1

Type 2

Type 1

Class 2

Answer

Correct Answer: Class 1

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What is the condition for a coincidence to occur?

When the amplitude of the incident sound wave projected onto a surface matches the bending amplitude of that surface.

When the wavelength of the incident sound wave projected onto a surface matches the bending wavelength of that surface.

When the wavelength of the incident light wave projected onto a surface matches the bending wavelength of that surface.

When the frequency of the incident sound wave projected onto a surface matches the bending frequency of that surface.

Answer

Correct Answer: When the wavelength of the incident sound wave projected onto a surface matches the bending wavelength of that surface.

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What is the difference between the expected calibration level set in the instrument and the level measured by the instrument during calibration?

The difference is called the calibration offset.

The difference is called the calibration error.

The difference is unimportant.

There is no difference.

Answer

Correct Answer: The difference is called the calibration offset.

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What is the process of Calibration?

The process of owning a sound meter

The process of measuring to determine the accuracy of your measurement chain.

The process of fixing your noise meter

The process of setting your dosemeter

Answer

Correct Answer: The process of measuring to determine the accuracy of your measurement chain.

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What is the process of measuring to determine the accuracy of your measurement chain called?

Measuring

Determining

Calibration

Noise

Answer

Correct Answer: Calibration

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What is the LCeq-LAeq value?

The LCeq-LAeq value is the average noise level over a measurement period.

The LCeq-LAeq value is the noise level over a measurement period.

The LCeq-LAeq value is the loudest noise level over a measurement period.

The LCeq-LAeq value is the sound level over a measurement period.

Answer

Correct Answer: The LCeq-LAeq value is the noise level over a measurement period.

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What does LCeq-LAeq refer to?

The frequency of sound waves.

The LCeq-LAeq value over a measurement period.

The required level of hearing protection.

The machine used to measure the LCeq-LAeq value.

Answer

Correct Answer: The LCeq-LAeq value over a measurement period.

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What does broadband refer to in noise measurements?

The lowest frequency in a range

A range of frequencies

Noise measurements using parameters which include all the audible noise such as dB(A) and dB(C)

The highest frequency in a range

Answer

Correct Answer: Noise measurements using parameters which include all the audible noise such as dB(A) and dB(C)

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What is the term for noise measurements which include all the audible noise?

DB(A)

Audible noise

Broadband

DB(C)

Answer

Correct Answer: Broadband

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What does the bel unit express?

The ratio of the powers

The logarithm to the base 10 of the ratio of the powers

The logarithm to the base 2 of the ratio of the powers

The relative magnitudes of two powers

Answer

Correct Answer: The relative magnitudes of two powers

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What is the term for the lower range of audible frequencies?

Alto

Treble

Middle

Bass

Answer

Correct Answer: Bass

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What does the term "Bass" refer to in music?

The middle range of audible frequencies

Higher range of audible frequencies

The range of frequencies inaudible to the human ear

Lower range of audible frequencies

Answer

Correct Answer: Lower range of audible frequencies

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What are the components of the human hearing system?

Inner ear

The external ear, the middle ear, the inner ear, the nerve pathways and the brain.

Middle ear

External ear

Answer

Correct Answer: The external ear, the middle ear, the inner ear, the nerve pathways and the brain.

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What is the conventionally accepted audio spectrum perceived by the human ear?

20Hz to 18kHz

20Hz to 20kHz

5Hz to 20kHz

15Hz to 25kHz

Answer

Correct Answer: 20Hz to 20kHz

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For Health and Safety work, what is the spectrum of interest usually quoted?

15Hz to 25kHz

20Hz to 20kHz

30Hz to 7kHz

31,5Hz to 8kHz

Answer

Correct Answer: 31,5Hz to 8kHz

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What does the word "attenuate" mean?

To reduce the level of an acoustical signal

To make an acoustical signal higher-pitched

To make an acoustical signal softer

To make an acoustical signal louder

Answer

Correct Answer: To reduce the level of an acoustical signal

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Which organization sets USA standards?

International Electrotechnical Commission

United States Standards Institute

American Standards Association

American National Standards Institute

Answer

Correct Answer: American National Standards Institute

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What is an anechoic chamber used for?

Soundproofing a room

Acoustical measurements

Determining the speed of sound

Measuring the wavelength of a sound wave

Answer

Correct Answer: Acoustical measurements

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What is the main purpose of an anechoic chamber?

To increase the reverberation time

To measure the speed of sound

To measure sound absorption

To suppress internal sound reflections

Answer

Correct Answer: To suppress internal sound reflections

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The metric most often used in the United Kingdom to describe ambient noise is _____.

L50

L95

L60

L90

Answer

Correct Answer: L90

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Which of the following is NOT a unit used to measure ambient noise?

L95

DB(A)

L99

L90

Answer

Correct Answer: DB(A)

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What is the main purpose of acoustic treatment?

To make a space more reverberant

To produce noise or vibration

To isolate noise or vibration and to correct acoustical faults in spaces

To create a soundproof room

Answer

Correct Answer: To isolate noise or vibration and to correct acoustical faults in spaces

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What does an Acoustic Fingerprint do?

Tracks a person's movements through a building.

Monitors the decisions made by a company's board of directors.

Keeps track of how often a person visits a website.

Allows triggers to be set up to start and stop audio recordings and markers.

Answer

Correct Answer: Allows triggers to be set up to start and stop audio recordings and markers.

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What is an acoustic fingerprint?

A system that allows for the equalization of audio recordings.

A system that allows for the enhancement of audio recordings.

A system that allows triggers to be set up to start and stop audio recordings and markers.

A system that allows for the removal of background noise in audio recordings.

Answer

Correct Answer: A system that allows triggers to be set up to start and stop audio recordings and markers.

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What is an acoustic calibrator?

A reference noise source used to calibrate and check the performance of a sound level meter.

A device that records sound waves.

A type of microphone

A machine that alters the pitch of sounds.

Answer

Correct Answer: A reference noise source used to calibrate and check the performance of a sound level meter.

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What is the study of sound waves called?

Radiology

Cardiology

Astrology

Acoustics

Answer

Correct Answer: Acoustics

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What is acoustics?

The study of the properties of matter

The study of light

The science of sound

The study of waves and oscillations

Answer

Correct Answer: The science of sound

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What is the value of the absorption coefficient of a perfect absorber?

0.5

0.75

Answer

Correct Answer: 1

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What is the absorption coefficient?

The fraction of sound energy that is absorbed at any surface.

The reflection of sound off a surface.

The transmission of sound through a medium.

The speed of sound in a medium.

Answer

Correct Answer: The fraction of sound energy that is absorbed at any surface.

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What is absorption?

The changing of sound energy to heat.

The transmission of sound waves.

The refraction of sound waves.

The reflection of sound waves.

Answer

Correct Answer: The changing of sound energy to heat.

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What did flat weighting indicate?

That a filter was applied, not across a stated frequency range.

That no filter was applied, not across a stated frequency range.

That a filter was applied, across a stated frequency range.

That no filter was applied, across a stated frequency range.

Answer

Correct Answer: That no filter was applied, across a stated frequency range.

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What does flat weighting indicate?

The IEC 61672 standard was created.

No filter was applied, across a stated frequency range.

Z-weighting was used.

A filter was applied, across a stated frequency range.

Answer

Correct Answer: No filter was applied, across a stated frequency range.

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What is C-Weighting used for?

Evaluation of environmental sounds

Evaluation of equipment sounds

Evaluation of human sounds

Evaluation of animal sounds

Answer

Correct Answer: Evaluation of equipment sounds

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What does "A" weighting filter do?

There is no such thing as an

A weighting filter only applies to low levels of sound

A weighting filter is only used for environmental sounds

A weighting filter most closely matches how humans perceive sound

Answer

Correct Answer: A weighting filter most closely matches how humans perceive sound

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What is the term for frequency filters that adjust the amplitude of all parts of the frequency spectrum of the sound or vibration?

Frequency weightings

Frequency prediction

Frequency amplitudes

Frequency measurements

Answer

Correct Answer: Frequency weightings

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More Acoustical Engineering Subjects

Architectural Acoustics

Noise & Vibration Control

Sound Insulation

Environmental Acoustics

Ear Anatomy

Basic Audiology

Microphones

Acoustic modelling software

Acoustics Design Practicum

Acoustical Modeling

Noise Control

Audio Visual System Design

Acoustical and Audio Measurements

Electroacoustics

Psychoacoustics

Musical Acoustics

More Resources

Acoustical Engineering Skill Assessment

Acoustical Engineering PDF

Related MCQs

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Measurement of Noise MCQ

What is the name of the 1:1 Octave Band Filter?

What is the name of the Octave Band that is shown graphically?

What does the 1:1 Octave Band Filter do?

What is Octave Band Leq,t?

What is the purpose of an Octave Band Filter?

What does Octave Band Leq,1s refer to?

What is the frequency range split into sections called?

What is the ratio of an octave?

What is the interval between two frequencies having a ratio of 2:1 called?

What is occupational hearing loss?

What is the NR of a sound pressure level if it intersects with the ordinate at 1kHz?

What is the NR at the sound pressure level of the intersection with the ordinate at 1Hz?

How can Noise-Induced Hearing Loss occur?

Which of the following is a cause of Noise-Induced Hearing Loss?

What is Noise-Induced Hearing Loss?

What is the full form of NC?

What does NC stand for in noise criteria?

What is noise floor?

What is noise?

What is the frequency of a free vibration?

What is natural frequency?

What are axial modes?

What converts acoustic pressure into an electrical signal?

What causes the maximum absorption to occur in a membrane absorber?

What does Lmax refer to?

What is the maximum noise level during a measurement period or noise event called?

What is the effect of masking?

LAF stands for ______

LAFmin stands for:

What does LAFmax stand for?

LAE is an abbreviation for which phrase?

What does L90 represent?

What does the L50 value represent?

What is the L50 value?

What does L10 represent?

What does L10 refer to?

What is the full form of ISO?

What does ISO stand for?

What does an Integrating Averaging Sound Level Meter do?

What is impulse?

What does IEC stand for?A: International Electro-technical CommissionB: International Energy CommissionC: Intergovernmental Economic Commission

Which of the following is NOT true about IEC standards?

A Helmholtz Resonator is named after which German physicist?

How does a Helmholtz resonator work?

What is the unit of frequency?

What is the hearing threshold level?

What is hearing loss?

How may frequency be expressed?

Free field microphones are designed to do what?

For which frequencies is a free field microphone designed?

Which of the following is true about acoustic energy?

What is the effect of focusing acoustic energy from a concave surface?

Flanking occurs when sound energy _____.

By-passing of a sound barrier at the edges is known as _______.

What does time weighting affect?

Which of the following is not a time weighting?

What is the unit of sound level?

What is LEP,d?

What is the actual time that an individual is exposed to noise called?

What does "Pa2h" stand for in the context of exposure?

What is the unit of measurement for exposure?

In the UK, what is the LAeq always based on?

What is the UK LAeq based on?

What does "Estimated dose" refer to?

What doesLeq measure?

What is the more common name for "time-average sound level"?

What is the common abbreviation for "Equivalent Continuous Level"?

What does ELC stand for?

Which of the following is not a property of an echo?

What is an Echo?

What noise limited the range of levels instruments can accurately measure?

What is the dynamic range of an instrument?

What is a noise dosemeter?

What is the cause of diffusion?

What is the definition of Diffusion?

What is the ability of a sound wave to pass round a screen or barrier called?

What is a diaphragm?

What is the symbol for decibel?

Decibel and Bel are which of the following?

What does IEC stand for?
A: International Electro-technical Commission
B: International Energy Commission
C: Intergovernmental Economic Commission