AVIXA AVIXA-CTS Online Practice Questions and Exam Preparation

AVIXA AVIXA-CTS Online Questions & Answers

• Question 161:

  In sound, amplitude is perceived as

  A. pitch
  B. tone
  C. loudness
  D. frequency
  C. loudness

  ---

  Explanation

  Amplitude refers to the strength or intensity of a sound wave and is directly related to how loud the sound is perceived. The greater the amplitude, the louder the sound. Pitch (Option A) relates to frequency, not amplitude, while tone (Option

  B. is more about the quality or character of sound. Frequency (Option D) determines the pitch, not the loudness.

  References:

  AVIXA CTS Exam Guide, Chapter on Audio Basics CTS Handbook, Section on Sound Wave Properties.

• Question 162:

  HOTSPOT

  Identify the cable which is LEAST susceptible to electromagnetic interference.

  Select the appropriate cable by clicking anywhere on the correct cable.

  

  

  ---

  The fourth cable from the left (black coaxial cable)

  The coaxial cable (the fourth cable from the left) is least susceptible to electromagnetic interference (EMI) due to its construction, which includes a central conductor surrounded by a shielding layer. This shielding, often made of metal foil or braided wire, effectively blocks external electromagnetic fields, preventing them from interfering with the signal.

  Here's a breakdown of each cable type:

  Twisted Pair Cable (first from the left): Susceptible to EMI unless shielded, though twisted pairs can reduce interference somewhat.

  Multi-conductor Cable (second from the left): More susceptible to EMI, depending on the shielding used.

  Fiber Optic Cable (third from the left): Immune to EMI, as it transmits data as light rather than electrical signals.

  Coaxial Cable (fourth from the left): Highly resistant to EMI due to its shielding, making it ideal for environments with significant electrical interference.

  CTS Technology Specialist Reference

  The CTS curriculum discusses the benefits of coaxial cable in environments with potential EMI due to its robust shielding properties. It's often recommended for AV installations where EMI is a concern. Fiber optic, which is not affected by EMI, is another choice, but coaxial is traditionally favored for certain AV applications due to cost and compatibility.

• Question 163:

  Which of the following is the BEST placement for studio monitor loudspeakers in a 4 m x 6 m room from an acoustic standpoint?

  

  A. Setup A
  B. Setup B
  C. Setup C
  D. Setup D
  B. Setup B

  ---

  Explanation

  In Setup B, the speakers are positioned symmetrically at ear level and angled towards the listener, which is the optimal configuration for achieving accurate sound reproduction and a balanced stereo image. In a small studio or listening environment, placing the speakers near the front wall and aimed directly at the listener minimizes acoustic issues such as reflections and standing waves. This setup maximizes direct sound while reducing unwanted room interactions.

  CTS Technology Specialist Reference

  According to CTS guidelines on sound reinforcement and speaker placement, monitor speakers should be positioned symmetrically and at ear level to ensure the best listening experience. Proper speaker placement enhances audio clarity and accuracy, which is essential for environments like studios and classrooms where sound quality is paramount.

• Question 164:

  A loud hiss is coming from the audio system. This is MOST LIKELY caused by

  A. fluorescent lighting.
  B. poor gain structure.
  C. phase cancellation issues.
  D. the microphones being off.
  B. poor gain structure.

  ---

  Explanation

  A loud hiss in an audio system is most commonly caused by poor gain structure. Gain structure refers to the optimal setting of input and output levels throughout an audio system to minimize noise and distortion while maximizing signal quality. Incorrectly set gain levels can amplify the inherent noise floor of the system, leading to audible hiss. Ensuring proper gain staging at each step-from microphones to mixers to amplifiers-helps reduce this noise.

• Question 165:

  After replacing a projector in a serviced room, which verification is most appropriate before closing the ticket?

  A. Confirm alignment, focus, image size, input routing, color or brightness settings, control commands, and user workflow against the room requirement.
  B. Close the ticket as soon as the projector lamp or light source turns on.
  C. Skip control testing because only the projector hardware changed.
  D. Leave image geometry for the client to adjust during the next meeting.
  A. Confirm alignment, focus, image size, input routing, color or brightness settings, control commands, and user workflow against the room requirement.

  ---

  Explanation

  A replacement device must be verified as part of the installed AV system, not only as a powered device. Alignment, focus, image size, routing, image settings, control, and user workflow checks confirm that the repair restores the room's intended function. Closing the ticket after a power check can leave operational failures behind.

• Question 166:

  The limits of the vertical visual field indicate that displays should be positioned where in relation to the viewers' standard line of sight?

  A. center of the image is precisely on-axis
  B. center of the image is at least 10 degrees above
  C. top of the image is no more than 30 degrees above
  D. bottom of the image is no more than 30 degrees below
  C. top of the image is no more than 30 degrees above

  ---

  Explanation

  For optimal viewing comfort, the top of a display should not be positioned more than 30 degrees above the viewer's line of sight. This guideline ensures that viewers do not have to strain their necks to see the entire screen. While Options A and B might seem reasonable, 30 degrees is considered the upper limit for comfortable viewing, with viewers ideally positioned to see the full display without needing to look up excessively.

  References:

  AVIXA CTS Exam Guide, Chapter on Display Mounting and Viewing Angles CTS Handbook, Section on Ergonomic Viewing Considerations.

• Question 167:

  A support technician resolves a recurring issue by changing a DSP preset and replacing a faulty patch cable.

  What should be recorded in the service log?

  A. Symptoms, date and time, room or system ID, observed cause, actions taken, parts used, test results, and follow-up needs.
  B. Only a note that the system works now.
  C. Only the technician's arrival time, with no description of the repair.
  D. Only the client's complaint, without the corrective action.
  A. Symptoms, date and time, room or system ID, observed cause, actions taken, parts used, test results, and follow-up needs.

  ---

  Explanation

  A useful service log supports trend analysis, warranty review, future troubleshooting, billing, and customer communication. It should capture symptoms, timing, location, cause, corrective actions, parts, verification, and follow-up items. Minimal notes do not give the next technician enough information to understand or maintain the system.

• Question 168:

  After installation, the system does not pass audio.

  Based on the information in the drawing, what is the MOST LIKELY cause?

  

  A. cable lengths
  B. system needs a DSP
  C. phantom power is required
  D. speaker requires a 70 V transformer
  C. phantom power is required

  ---

  Explanation

  The microphone in the setup may require phantom power to operate. Phantom power is a DC voltage (usually 48V) supplied through the microphone cable to power condenser microphones. Without phantom power, a condenser microphone will not function, resulting in no audio being passed through the system. Since the drawing shows a microphone connected to a digital audio transmitter, it's likely a condenser microphone, and if it isn't receiving phantom power, this would be the most probable cause of the system not passing audio.

• Question 169:

  A technician sets up a 1080p LCD screen and connects a 720p source via an 8 m (26 ft) HDMI cable. Later, the source is switched to 1080p output and the image appears on screen, but with sparkling pixels and occasional dropouts.

  Why has the image quality degraded?

  A. Color depth requirement
  B. Change to aspect ratio needs to register
  C. Signal bandwidth exceeds cable capabilities
  D. EDID information is incorrect for new image
  C. Signal bandwidth exceeds cable capabilities

  ---

  Explanation

  Higher resolution (like 1080p) increases bandwidth demands. While the cable was sufficient for 720p, switching to 1080p may exceed its capabilities-especially over longer distances (like 8 meters), leading to sparkling, dropouts, or signal instability.

  "HDMI signal degradation over long runs is often caused by insufficient bandwidth handling, particularly at higher resolutions like 1080p or 4K." -CTS Exam Guide, Signal Integrity and Cabling Standards

• Question 170:

  Noting the position of ventilation ducts is useful when determining.

  A. the best position for the lectern.
  B. the heat gain of the equipment rack.
  C. where a projector can be suspended.
  D. where people can be seated in the room.
  C. where a projector can be suspended.

  ---

  Explanation

  When installing a projector, it is essential to account for ventilation ducts as they affect where a projector can be suspended. Ventilation ducts influence airflow and can affect the cooling requirements of AV equipment. Positioning near ducts may cause issues like vibration, interference with airflow, and temperature inconsistencies. CTS Technology Specialist Reference.

  The CTS materials emphasize checking ventilation, HVAC placement, and airflow during site surveys to determine optimal equipment placement and avoid interference with cooling and sound.