Question 1

The voice recognition system microphone is usually located near the glove box door.

Accepted Answer

The voice recognition system microphone in most vehicles is typically located in the overhead console or near the rearview mirror, not near the glove box door. This placement helps the microphone pick up the driver's voice more clearly without interference from other sounds.

Question 2

The satellite radio antenna can be mounted on a fiberglass or composite spoiler.

Accepted Answer

False

Question 3

Speaker polarity can be tested using a small battery.

Accepted Answer

Connecting a small battery (like a 9V battery) to the speaker terminals momentarily causes the speaker cone to move. If the cone moves outward, the polarity is correct (positive to positive, negative to negative); if it moves inward, the polarity is reversed.

Question 4

A Bluetooth signal can typically travel ________.

Accepted Answer

Bluetooth technology, in its most common implementations such as Bluetooth Classic, has a typical range of about 10 meters (33 feet), which corresponds to both options A and B being correct.

Question 5

To safely install a power amplifier in-line capacitor, it must first be ________.

Accepted Answer

To safely install a power amplifier in-line capacitor, it must first be precharged. This is to prevent any sudden inrush of current that could potentially damage the amplifier or the capacitor itself. Precharging gradually brings the capacitor up to the operating voltage, reducing the risk of electrical shock or component damage.

Question 6

These speakers have a combined impedance of ________.

Accepted Answer

The answer of These speakers have a combined impedance of...

Question 7

Which of these tools is used to test for a reading of infinity between the center antenna lead and the antenna?

Accepted Answer

An ohmmeter is used to measure resistance between two points in an electrical circuit. When testing for a reading of infinity between the center antenna lead and the antenna, an ohmmeter is used to confirm there is no electrical continuity, indicating a break or complete isolation in the circuit.

Question 8

100,000 ?F means ________.

Accepted Answer

The answer of 100,000 ?F means ________.
...

Question 9

A bolt of lightning generates broad radio frequency bandwidths known as ________.

Accepted Answer

Lightning generates broad radio frequency bandwidths that can cause both Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI), affecting electronic devices and communication systems.

Question 10

More than one signal can be carried by a radio wave using a process called ________.

Accepted Answer

Sideband operation is a process that allows multiple signals to be carried by a single radio wave. This is done by modulating the carrier wave with the different signals, which creates sidebands on either side of the carrier frequency. The sidebands contain the information from the different signals, and they can be demodulated to recover the original signals.

Question 11

Technician A says that radios receive AM and FM signals that are broadcast through the air. Technician B says that the radio antenna is used to induce a very large voltage signal as an input into the radio from the electromagnetic energy from the broadcast station. Who is right?

Accepted Answer

Technician A is correct because radios do receive AM and FM signals broadcast through the air. Technician B is incorrect because the radio antenna does not induce a very large voltage; it captures the electromagnetic signals, which are then amplified by the radio.

Question 12

Technician A says that FM requires an antenna whereas AM may be heard from a radio without an antenna. Technician B says that speakers reproduce the original sound and their impedance should be matched. Who is right?

Accepted Answer

Technician B is correct because speakers need to have their impedance matched to the audio system for optimal performance. Technician A is incorrect because both FM and AM radio signals typically require an antenna for proper reception.

Question 13

Technician A says that crossovers are used to block certain frequencies to allow each type of speaker to perform its job better. Technician B says that a high-pass filter is used to block high-frequency sounds being sent to large woofer speakers, and a low-pass filter blocks low-frequency sounds being sent to tweeters. Who is right?

Accepted Answer

The answer of Technician A says that crossovers are used...

Question 14

All of these can cause radio interference, EXCEPT ________.

Accepted Answer

An open in the radio power circuit would prevent the radio from functioning, rather than causing interference.

Question 15

A ________ is the time and distance between two consecutive points, either high or low.

Accepted Answer

Wavelength is defined as the distance between two consecutive points in a wave, typically from crest to crest or trough to trough, which corresponds to one complete cycle of the wave.

Question 16

The number of times a particular waveform repeats itself in a given amount of time (frequency) is measured in ________.

Accepted Answer

Hertz is the unit of frequency, representing the number of cycles per second of a waveform.

Question 17

Which of these is a term used to describe when information is added to a constant frequency?

Accepted Answer

Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. This is a fundamental concept in telecommunications.

Quiz 61: Audio System Operation and Diagnosis