Question 1

What type of speaker cone is typically less than 2&#34; in diameter and more often resemble a flat diaphragm rather than a cone?&#10;A) Woofer&#10;B) Mid-range&#10;C) Horn&#10;D) Tweeter

Accepted Answer

Tweeter cones are typically less than 2" in diameter and are more often flat diaphragms rather than cones.

Question 2

A subwoofer should be pointed directly at the subject to hear the low frequency audio clearly.

Accepted Answer

A subwoofer should not be pointed directly at the subject as it may cause excessive boominess and distortion. It is recommended to position the subwoofer diagonally or in a corner for optimal bass response.

Question 3

If a sound source were moved against a wall and the sphere of radiation were bisected, the measured sound pressure level would double.

Accepted Answer

The sound pressure level would double because the sound source is now radiating into half the space, so the sound pressure level would increase by 6 dB.

Question 4

According to the National Electrical Code, audio circuit wiring can be placed directly on suspended ceiling tiles.

Accepted Answer

According to the National Electrical Code (NEC), audio circuit wiring cannot be placed directly on suspended ceiling tiles. It must be run through approved wiring methods such as conduit or raceways.

Question 5

What type of audio device is used to separate and direct a complex mixture of audio frequencies to their required sized loads?&#10;A) A Crossover&#10;B) A Filter&#10;C) A Mixer&#10;D) A Microphone

Accepted Answer

A crossover is designed to separate audio frequencies into different bands, directing them to the appropriate speaker drivers. This allows each driver to handle only the frequencies it is best suited for, resulting in cleaner and more accurate sound reproduction.

Question 6

An external power source for condenser microphones is called ________.&#10;A) A Battery&#10;B) A generator&#10;C) Phantom Power&#10;D) A Mixer

Accepted Answer

Phantom power is the external power source required for condenser microphones. Option A, battery can be used for some condenser microphones but it is not the external power source required for all condenser microphones. Option B, generator is not used to power condenser microphones. Option D, mixer can provide phantom power but it is not the external power source itself.

Question 7

What audio device converts an electrical current back into a mechanical vibration to reproduce sound?&#10;A) A Loudspeaker&#10;B) A Microphone&#10;C) An Amplifier&#10;D) All of the above

Accepted Answer

Only a loudspeaker converts an electrical current back into a mechanical vibration to reproduce sound. Microphones convert sound waves into an electrical current and amplifiers increase the amplitude of an electrical signal, but neither convert electrical current back into mechanical vibration to produce sound.

Question 8

When wiring audio equipment using metal racks, what are the requirements for grounding?&#10;A) Both the metal rack and the equipment must be grounded&#10;B) Only the metal rack needs to be grounded&#10;C) Only the equipment needs to be grounded&#10;D) Neither need to be grounded because an overcurrent protection device is required by the NEC

Accepted Answer

Both the metal rack and the equipment must be grounded to ensure electrical safety and prevent electrical noise. Grounding the metal rack provides a common ground reference for all the equipment in the rack, which can reduce the risk of ground loops and interference. Grounding the individual pieces of equipment helps to protect against electric shocks and ensures that any fault current will be safely directed to ground.

Question 9

The purpose of using bells or tones in a PA system is _______.&#10;A) To assure that the telephone system is tied into the main audio circuit&#10;B) To use them as the alert for the fire alarm system&#10;C) To help get the attention of the audience before a message is conveyed&#10;D) To be able to play music for the entire building

Accepted Answer

The purpose of using bells or tones in a PA system is to help get the attention of the audience before a message is conveyed. This is helpful in public spaces such as schools, airports, and stadiums where there may be a lot of noise or distractions. It alerts people to pay attention to important announcements or information that is about to be shared.

Question 10

The internal source resistance of a microphone and the capacitance of the microphone cable form what type of filter network at the input of the amplifier?&#10;A) High-pass filter&#10;B) Low-pass filter&#10;C) Bandpass filter&#10;D) Notch filter

Accepted Answer

The internal source resistance of a microphone combined with the capacitance of the microphone cable creates a low-pass filter. This is because the resistance-capacitance (RC) circuit allows low-frequency signals to pass while attenuating higher frequency signals.

Question 11

A balanced line is one that uses two circuit conductors having equal impedance from either side to ground.

Accepted Answer

The answer of A balanced line is one that uses...

Question 12

The power amplifier is the last stage of amplification between the signal input and the output speakers.

Accepted Answer

The answer of The power amplifier is the last stage...

Question 13

An audio signal that has priority over all other signals is said to have precedence.

Accepted Answer

The answer of An audio signal that has priority over...

Question 14

A condenser microphone requires the use of an external power source to operate.

Accepted Answer

The answer of A condenser microphone requires the use of...

Question 15

According to the National Electrical Code, how far must audio equipment supplied by a branch-circuit be installed from the inside wall of the body of water?&#10;A) Not less than 12 inches&#10;B) 3ft.&#10;C) 5ft.&#10;D) 8ft.

Accepted Answer

The answer of According to the National Electrical Code, how...

Question 16

What piece of test equipment is designed to measure the frequency response of a room?&#10;A) An oscilloscope&#10;B) A sound level meter&#10;C) An audio generator&#10;D) A spectrum analyzer

Accepted Answer

The answer of What piece of test equipment is designed...

Question 17

According to the National Electrical Code, audio circuits do not have any conduit fill restrictions.

Accepted Answer

The answer of According to the National Electrical Code, audio...

Question 18

Wireless microphones operate using infrared technology between the amplifier and the microphone.

Accepted Answer

The answer of Wireless microphones operate using infrared technology between...

Question 19

External, wall-mount volume controls are made from adjustable audiotransformers.

Accepted Answer

The answer of External, wall-mount volume controls are made from...

Question 20

Balanced, low-impedance microphones will most likely use a/an __________ connector?&#10;A) RCA&#10;B) XLR&#10;C) Monoplug&#10;D) RJ-45

Accepted Answer

The answer of Balanced, low-impedance microphones will most likely use...

Question 21

Match between columns&#10;                        Premises: ________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns&#10;________ Combine the effects of differing polar patterns

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 22

Match between columns&#10;                        Premises: ________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment&#10;________ Most widely used in detecting  the overall sound image  of an environment

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 23

Match between columns&#10;                        Premises: ________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments&#10;________ Most widely used in loud  environments

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 24

Match between columns&#10;                        Premises: ________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern&#10;________ Sensitive to sounds in a 360 S1U1P1 &#9702; S1S1P0 pattern

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 25

Match between columns&#10;                        Premises: ________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm&#10;________ Barely allows a 60-degree  window of detection along  the front of the diaphragm

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 26

Match between columns&#10;                        Premises: ________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear&#10;________ Sensitive to sounds originating from the front and rear

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 27

A 70V audiotransformer tapped at 10W will output _________ voltage at the 8 &#8486; load. (assume the transformer has no loss).

Accepted Answer

The answer of A 70V audiotransformer tapped at 10W will...

Question 28

Calculate the amplifier power requirements when a load consists of ten 1W transformers, five 5W transformers and three 10W transformers.

Accepted Answer

The answer of Calculate the amplifier power requirements when a...

Question 29

Match between columns&#10;                        Premises: ________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB&#10;________ Signals approaching from the rear, at 180 degrees, are reduced by as much as 25 dB

Accepted Answer

The Answer of Omni-directional and Bi-directional and Uni-directional and Cardioid is...

Question 30

Calculate the decibel level of a 400&#181;V microphone signal. (Assume a 1mW reference and 150 &#8486; impedance).

Accepted Answer

The answer of Calculate the decibel level of a 400&#181;V...

Deck 5: Audio Signal-Processing, Amplification, and Reproduction Equipment and National Electrical Code Article 640