Download CWNA 108Certified Wireless Network Administrator Naval Shipbuilders NDT III Specific Magne and more Exams Technology in PDF only on Docsity!
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Question 1. Which characteristic defines a radio frequency (RF) signal’s wavelength? A) The number of cycles per second B) The distance between two consecutive wave peaks C) The strength of the signal D) The change in signal direction Answer: B Explanation: Wavelength is the physical distance between two consecutive peaks (crests) of a wave. Question 2. What is the main function of an omnidirectional antenna in a WLAN?
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
A) Focuses RF energy in a narrow beam B) Radiates RF energy equally in all horizontal directions C) Reflects RF signals to another antenna D) Absorbs unwanted RF interference Answer: B Explanation: Omnidirectional antennas distribute energy evenly in all horizontal directions, providing broad coverage. Question 3. Which IEEE standard defines the original wireless LAN protocols? A) 802. B) 802.
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Answer: B Explanation: MT is only effective on ferromagnetic materials, which can be magnetized. Question 5. What is the primary purpose of performing a site survey before WLAN deployment? A) To install access points B) To determine optimal AP placement and verify coverage C) To configure VLANs D) To set up authentication servers Answer: B
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Explanation: Site surveys help determine the best AP placement for optimal coverage and performance. Question 6. Which property of a sine wave relates to its height from the baseline? A) Frequency B) Wavelength C) Amplitude D) Phase Answer: C Explanation: Amplitude is the height of the wave from the baseline and relates to signal strength.
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Question 8. Which method is used to magnetize a long, tubular naval component for MT? A) Yoke method B) Coil method C) Central conductor method D) Prod method Answer: C Explanation: The central conductor method is ideal for long, tubular components, providing circular magnetization. Question 9. What is the main difference between dBm and dBi?
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
A) dBm refers to power relative to 1 mW; dBi is antenna gain relative to an isotropic radiator B) dBm is always negative; dBi is always positive C) dBm is for voltage; dBi is for current D) dBm is used for fiber optics; dBi is for radio Answer: A Explanation: dBm measures power relative to 1 milliwatt; dBi measures antenna gain compared to an isotropic antenna. Question 10. Which 802.11 amendment introduced the concept of MIMO (Multiple Input, Multiple Output)? A) 802.11a
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
D) Requires less magnetizing current Answer: B Explanation: Fluorescent particles are more sensitive and provide better indication contrast under UV light. Question 12. What does the term “Free Space Path Loss (FSPL)” refer to in RF theory? A) Loss due to absorption by materials B) Loss of signal strength as it travels through open air C) Loss due to multipath interference D) Loss caused by antenna impedance mismatch Answer: B
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Explanation: FSPL is the loss in signal strength as it propagates through free space. Question 13. Which device is used to measure the strength of a magnetic field during MT? A) Thermometer B) Gaussmeter/Tesla meter C) Multimeter D) Pressure gauge Answer: B Explanation: A Gaussmeter or Tesla meter measures the strength of a magnetic field.
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Question 15. In Magnetic Particle Testing, what is the effect of increasing the magnetizing current? A) Decreases field strength B) Increases depth of penetration of the magnetic field C) Increases surface roughness D) Decreases test sensitivity Answer: B Explanation: Higher magnetizing current increases the depth of magnetic field penetration. Question 16. What is the purpose of the Service Set Identifier (SSID) in WLANs?
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
A) To assign IP addresses B) To identify a specific wireless network C) To provide encryption D) To define channel bandwidth Answer: B Explanation: The SSID uniquely identifies a wireless network for clients. Question 17. Which organization is responsible for Wi-Fi certification and interoperability testing? A) IEEE B) IETF
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Answer: D Explanation: Power can be measured in Watts or referenced in dBm. Question 19. Which type of magnetic particle media provides the best sensitivity for fine, shallow discontinuities? A) Dry powder, visible B) Wet suspension, fluorescent C) Dry powder, fluorescent D) Wet suspension, visible Answer: B Explanation: Wet fluorescent media offer the highest sensitivity for detecting small, shallow flaws.
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Question 20. What is the function of the Distribution System (DS) in WLAN architecture? A) To manage VLANs B) To interconnect access points and the wired network C) To distribute encryption keys D) To authenticate users Answer: B Explanation: The DS links APs to the wired infrastructure, enabling communication beyond a single AP. Question 21. What does the term “reflection” mean in RF propagation?
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
C) Wi-Fi Alliance D) IETF Answer: B Explanation: The FCC (Federal Communications Commission) regulates wireless devices in the US. Question 23. What is the purpose of a “Pie Gauge” in Magnetic Particle Testing? A) To measure electrical resistance B) To indicate the direction and relative strength of a magnetic field C) To measure temperature during testing D) To check particle concentration
Administrator Naval Shipbuilders NDT
III Specific Magnetic Particle Testing
Exam
Answer: B Explanation: The Pie Gauge is a field indicator used to assess direction and strength of magnetic fields. Question 24. Which modulation technique is used by 802.11a and 802.11g PHYs? A) DSSS B) FHSS C) OFDM D) MIMO Answer: C Explanation: Both 802.11a and 802.11g use OFDM modulation.
