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Question 141

Which audio phenomenon occurs when a microphone picks up amplified sound from a loudspeaker?

1. Reverberation
2. Diffusion
3. Attenuation
4. Acoustic feedback

Correct Answer: 4

Explanation:

Acoustic feedback occurs when sound from a loudspeaker is picked up again by a microphone and re-enters the amplification system. If the loop gain becomes sufficiently high at particular frequencies, the system can produce an audible ringing or sustained tone. Proper microphone and loudspeaker placement, directional microphone selection, appropriate gain settings, and acoustic treatment can help reduce the risk. Reverberation describes sound persistence in a room, diffusion redistributes acoustic energy, and attenuation describes reduction in signal strength.

Question 142

Which connector is commonly used for professional digital video over coaxial cable?

1. RCA
2. BNC
3. XLR
4. TRS

Correct Answer: 2

Explanation:

BNC connectors are widely used for professional video connections, including many SDI applications that transmit digital video over coaxial cable. Their locking mechanism provides a secure connection suitable for professional environments. RCA connectors can carry various consumer audio or video signals, while XLR and TRS connectors are primarily associated with audio applications. Connector selection should always be confirmed against the signal format and equipment specifications because a physically compatible connector does not necessarily guarantee electrical or protocol compatibility.

Question 143

Which audio parameter describes the difference between the quietest and loudest usable levels?

1. Dynamic range
2. Impedance
3. Sampling rate
4. Polarity

Correct Answer: 1

Explanation:

Dynamic range describes the difference between the highest usable signal level and the lowest usable level within a system or device. A system with adequate dynamic range can accommodate variations in program material while maintaining acceptable noise and distortion performance. Impedance describes an electrical load characteristic, sampling rate relates to digital audio conversion, and polarity identifies signal orientation. Dynamic range is an important consideration when evaluating microphones, converters, processors, amplifiers, and other components in professional AV systems.

Question 144

Which device converts optical signals into electrical signals?

1. Audio mixer
2. Optical receiver
3. Power amplifier
4. Control keypad

Correct Answer: 2

Explanation:

An optical receiver converts an incoming optical signal into an electrical signal that compatible downstream equipment can process. In fiber-based AV systems, optical receivers are commonly used at the destination end of a transmission path. An audio mixer combines and adjusts audio signals, a power amplifier increases audio output power, and a control keypad provides user commands. The receiver must be compatible with the fiber type, optical wavelength, signal format, transmission distance, and connector arrangement used by the system.

Question 145

What does chroma subsampling reduce in a digital video signal?

1. Audio resolution
2. Frame duration
3. Color information
4. Screen brightness

Correct Answer: 3

Explanation:

Chroma subsampling reduces the amount of color information stored or transmitted in a digital video signal while generally preserving more complete luminance information. Human vision is more sensitive to luminance detail than fine color detail, allowing certain video systems to reduce data requirements with limited visible impact. Audio resolution and frame duration are unrelated to chroma subsampling, while screen brightness is a display characteristic. Common sampling schemes are expressed using notation such as 4:4:4, 4:2:2, and 4:2:0.

Question 146

Which network condition occurs when transmitted packets fail to reach their destination?

1. Packet loss
2. Bandwidth
3. Throughput
4. Resolution

Correct Answer: 1

Explanation:

Packet loss occurs when network packets fail to arrive at their intended destination. In networked AV systems, packet loss can produce interruptions, artifacts, missing audio, or other performance problems depending on the transported media and protocol. Bandwidth represents available data-carrying capacity, throughput represents the actual rate of successfully transferred data, and resolution describes image detail. Network troubleshooting should examine packet loss together with latency, jitter, congestion, physical connectivity, configuration, and the behavior of the specific AV protocol.

Question 147

Which digital audio characteristic specifies the number of samples captured each second?

1. Bit depth
2. Sampling rate
3. Dynamic range
4. Channel count

Correct Answer: 2

Explanation:

Sampling rate specifies how many audio samples are captured or processed each second and is expressed in samples per second or hertz. Common digital audio systems use standardized sampling rates appropriate to their applications. Bit depth determines the number of digital levels available for each sample, dynamic range describes usable level range, and channel count indicates the number of separate audio channels. Matching sampling rates between connected devices or using appropriate conversion helps prevent compatibility problems in digital audio systems.

Question 148

Which component provides electrical isolation between two signal paths?

1. Signal splitter
2. Isolation transformer
3. Video scaler
4. Network switch

Correct Answer: 2

Explanation:

An isolation transformer provides electrical isolation between connected signal paths while allowing appropriate signal energy to transfer magnetically. In AV systems, isolation can help address certain ground-loop or electrical-interface problems when used correctly. A signal splitter distributes a signal, a video scaler changes video characteristics, and a network switch connects network devices. Isolation equipment should be selected according to the signal type and application because improper use can affect frequency response, level, or other system characteristics.

Question 149

Which video parameter determines the number of pixels forming an image?

1. Resolution
2. Contrast
3. Color temperature
4. Luminance

Correct Answer: 1

Explanation:

Resolution identifies the pixel dimensions used to form a digital image, such as the number of pixels across and vertically. Higher resolution can provide greater image detail when the source, display, viewing distance, and content support it. Contrast describes differences between light and dark areas, color temperature describes the perceived color of neutral light, and luminance describes visible light intensity. Resolution should be considered alongside screen size, viewing distance, source capability, signal bandwidth, and display specifications.

Question 150

Which rack specification indicates the standard width of equipment mounting?

1. Rack height
2. Rack depth
3. Rack width
4. Rack load

Correct Answer: 3

Explanation:

Rack width identifies the horizontal mounting dimension used by rack equipment and the associated rack framework. Standardized rack dimensions allow compatible equipment to be installed within suitable enclosures. Rack height concerns available vertical space, rack depth concerns front-to-back clearance, and rack load concerns the amount of equipment weight the rack can safely support. Designers should also verify equipment depth, ventilation requirements, cable access, mounting hardware, and service clearance before selecting an enclosure.

Question 151

Which device measures electrical voltage, resistance, and current?

1. Multimeter
2. Lux meter
3. SPL meter
4. Colorimeter

Correct Answer: 1

Explanation:

A multimeter is a versatile electrical test instrument capable of measuring quantities such as voltage, resistance, and current when configured appropriately. It is commonly used for troubleshooting power and signal-related electrical conditions in AV installations. A lux meter measures illumination, an SPL meter measures sound pressure level, and a colorimeter evaluates color-related characteristics. Technicians must select the correct measurement mode, range, leads, and connection method and should follow applicable electrical safety procedures when testing energized circuits.

Question 152

Which audio connector is designed with separate contacts for left and right channels in some consumer applications?

1. BNC
2. RCA
3. HDMI
4. LC

Correct Answer: 2

Explanation:

RCA connectors are commonly used in consumer AV systems for separate analog audio channels, with individual connectors often assigned to left and right signals. They are also used for other signal types depending on the equipment. BNC is widely associated with professional video and certain RF applications, HDMI carries digital multimedia, and LC is a fiber-optic connector. The signal format should always be confirmed because the physical connector alone does not completely define the electrical or digital characteristics of a connection.

Question 153

Which network metric measures the actual rate of successfully delivered data?

1. Throughput
2. Latency
3. Jitter
4. Packet loss

Correct Answer: 1

Explanation:

Throughput represents the actual amount of data successfully transferred through a network over a given period. It can differ from the theoretical bandwidth of a connection because congestion, protocol overhead, packet loss, equipment limitations, and other conditions can reduce effective performance. Latency measures transmission delay, jitter describes variation in packet timing, and packet loss identifies packets that fail to arrive. Networked AV systems should be evaluated using appropriate performance measurements for the media and protocols being transported.

Question 154

Which screen characteristic indicates how much light is reflected toward viewers?

1. Resolution
2. Screen gain
3. Frame rate
4. Pixel count

Correct Answer: 2

Explanation:

Screen gain describes the relative amount of light reflected by a projection screen compared with a reference surface under defined measurement conditions. Screen gain can influence perceived image brightness and viewing characteristics. Resolution and pixel count describe image detail, while frame rate describes how frequently video frames are presented. Screen selection should consider projector output, viewing angles, room lighting, audience arrangement, screen size, surface characteristics, and the intended application rather than relying on gain alone.

Question 155

Which process adjusts audio frequency levels to shape tonal response?

1. Compression
2. Equalization
3. Routing
4. Mixing

Correct Answer: 2

Explanation:

Equalization adjusts the relative levels of selected frequency ranges to shape the tonal response of an audio signal. It can be used to correct unwanted room or system characteristics, improve speech clarity, or achieve a desired sound balance. Compression changes dynamic behavior, routing determines signal destinations, and mixing combines multiple audio sources. Equalization should be applied carefully because excessive boosts or cuts can introduce unwanted tonal changes, reduce headroom, or interact with room acoustics and loudspeaker behavior.

Question 156

Which lighting property describes the perceived warmth or coolness of white light?

1. Illuminance
2. Luminous intensity
3. Color temperature
4. Light output

Correct Answer: 3

Explanation:

Color temperature describes the perceived warmth or coolness of a light source and is commonly expressed in kelvins. Lower color temperatures generally appear warmer, while higher values generally appear cooler or more bluish. Illuminance describes light falling on a surface, luminous intensity concerns light emitted in a particular direction, and light output describes the quantity of emitted light. Color temperature is especially important in AV spaces containing cameras, displays, presentation lighting, and architectural illumination where consistent visual appearance is desired.

Question 157

Which AV practice establishes consistent names for installed equipment and connections?

1. Equipment labeling
2. Signal amplification
3. Video scaling
4. Acoustic diffusion

Correct Answer: 1

Explanation:

Equipment labeling establishes consistent names or identifiers for devices, cables, connections, and other system elements. Clear labels make installation, troubleshooting, maintenance, and future modifications more efficient because technicians can identify components without tracing every connection manually. Signal amplification changes signal level, video scaling changes image characteristics, and acoustic diffusion affects sound distribution. A useful labeling scheme should be consistent with project documentation and remain readable, durable, and logically organized throughout the installation.

Question 158

Which network protocol is commonly used to monitor and manage network devices?

1. SMTP
2. SNMP
3. FTP
4. SIP

Correct Answer: 2

Explanation:

SNMP, or Simple Network Management Protocol, is commonly used to monitor and manage network devices. It can provide information about device status, performance, and certain operational conditions when supported and appropriately configured. SMTP is associated with email transmission, FTP supports file transfer, and SIP is commonly used for session initiation in communication systems. Networked AV environments may use management protocols to improve visibility into switches, endpoints, and other infrastructure, although implementation depends on the network architecture and security policies.

Question 159

Which video feature communicates a display’s supported capabilities to a source device?

1. HDCP
2. Genlock
3. EDID
4. Scaling

Correct Answer: 3

Explanation:

EDID, or Extended Display Identification Data, allows a display or other sink device to communicate supported characteristics to a connected source. Information can include supported resolutions, refresh rates, and other capabilities. HDCP provides content protection, genlock addresses synchronization, and scaling changes image dimensions or resolution. EDID management is important in digital AV systems because incompatible or unexpected display information can cause resolution selection, switching, or interoperability problems. AV equipment may include EDID management features to provide more predictable system behavior.

Question 160

Which installation practice provides access for future equipment servicing?

1. Removing all spare space
2. Blocking rear connections
3. Maintaining service clearance
4. Sealing every access panel

Correct Answer: 3

Explanation:

Maintaining service clearance provides technicians with the physical space needed to inspect, disconnect, replace, or adjust equipment after installation. Adequate clearance is especially important around rack equipment, projectors, displays, amplifiers, and other components that may require periodic access. Removing spare space, blocking rear connections, or sealing access panels can make maintenance unnecessarily difficult. Service requirements should be considered during design and installation, including manufacturer recommendations, equipment ventilation, cable access, safe working space, and the expected frequency of future servicing.