NICET IB PSC TECHNICIAN
CERTIFICATION EXAM PREP COMPLETE
150 Q and A BANK
NICET IB-PSC Level II Practice Exam
1. A technician is conducting a grid test for an Emergency Radio
Coverage Enhancement System (ERCES) in a 10-story building.
According to NFPA 1221 and IFC 510, what is the minimum
required signal strength that must be measured across 95% of the
designated areas?
A. -85 dBm
B. -95 dBm
C. -105 dBm is the correct answer.
D. -115 dBm
Rationale: Both NFPA 1221 and the International Fire Code
(IFC) Section 510 establish that a minimum signal strength of -
105 dBm is mandatory for both inbound and outbound radio
communications across 95% of the floor areas.
2. During a routine inspection of a Class B Bi-Directional Amplifier
(BDA), the technician notes the system is oscillating. Which of the
following field adjustments is the most effective immediate fix to
eliminate oscillation while maintaining system integrity?
A. Increase the uplink attenuation.
B. Decrease the donor antenna height.
C. Increase attenuation on both uplink and downlink to
ensure the isolation is at least 20 dB greater than the
maximum gain is the correct answer.
D. Swap the donor antenna with an omnidirectional antenna.
Rationale: To prevent feedback loops and oscillation in a BDA
system, the structural isolation between the donor antenna and
the distributed antennas must be at least 20 dB higher than the
operating gain of the amplifier.
3. When installing coaxial cable for a public safety DAS in a vertical
riser, what is the minimum fire-resistance rating required for the
, enclosure protecting the cable backbone according to NFPA code?
A. 1 hour
B. 2 hours is the correct answer.
C. 3 hours
D. No rating is required if plenum cable is used.
Rationale: NFPA regulations mandate that the backbone
cables for public safety communication systems must be protected
by a 2-hour fire-rated enclosure or consist of 2-hour fire-rated
cables to ensure survival during an active fire.
4. A public safety responder radio system utilizes a donor antenna
aimed at a remote public safety communication tower. If the donor
antenna experiences significant physical misalignment due to a
severe windstorm, which system metric will show the most
immediate degrading impact?
A. VSWR at the dummy load.
B. Downlink Received Signal Strength Indicator (RSSI)
and Carrier-to-Interference-plus-Noise Ratio (CINR) is
the correct answer.
C. 120VAC input current draw.
D. Class A filter bandpass width.
Rationale: Physical misalignment of a highly directional
donor antenna directly degrades the line-of-sight path to the
donor tower, causing a severe drop in the downlink RSSI and RF
signal quality (CINR).
5. Which type of NEMA enclosure is strictly required by IFC 510 for
housing the central processing units, power supplies, and bi-
directional amplifiers of an in-building public safety radio
enhancement system?
A. NEMA 1
B. NEMA 3R
C. NEMA 4 or NEMA 4X is the correct answer.
D. NEMA 12
Rationale: Fire codes explicitly require all primary ERCES
equipment (BDAs, battery backups) to be housed in NEMA 4 or
4X weatherproof, dust-tight, and water-spray resistant
enclosures painted red.
6. While calculating the link budget for an ERCES installation, a
technician must factor in the attenuation of 1/2-inch coaxial cable.
, If a run of 200 feet has a spec loss of 2.5 dB per 100 feet at 800
MHz, what is the total cable loss?
A. 2.5 dB
B. 5.0 dB is the correct answer.
C. 7.5 dB
D. 10.0 dB
Rationale: Total loss is calculated by multiplying the length
by the loss per unit. 200 feet at 2.5 dB per 100 feet equals exactly
5.0 dB of RF attenuation.
7. What is the fundamental operational difference between a Class A
and a Class B Bi-Directional Amplifier used in public safety
communications?
A. Class A filters narrow individual channels, while Class
B filters broader passbands encompassing multiple
channels is the correct answer.
B. Class A operates on DC power, while Class B operates
exclusively on AC power.
C. Class A is for outdoor use, while Class B is strictly for indoor use.
D. Class A handles analog signals, while Class B handles P25 Phase
II digital signals.
Rationale: Class A channelized amplifiers target specific,
narrow radio frequencies (typically 12.5 to 25 kHz wide), whereas
Class B amplifiers process wide blocks of frequencies
(broadband), making Class B more prone to amplifying out-of-
band noise.
8. According to NFPA rules, the secondary power supply (Battery
Backup System) for an in-building public safety radio
enhancement system must be capable of operating at 100%
capacity for a minimum of how many hours?
A. 4 hours
B. 12 hours
C. 24 hours is the correct answer.
D. 48 hours
Rationale: NFPA 1221 and IFC 510 require the autonomous
backup battery system to support continuous, full-load operation
of the ERCES system for at least 24 hours during a primary
power outage.
, 9. A technician connects a spectrum analyzer to the test port of a
downlink BDA and observes an elevated noise floor even when no
active radios are transmitting in the building. What is the most
likely cause of this phenomenon?
A. The donor tower is turned off.
B. Excessive uplink or downlink gain causing thermal
noise amplification or system oscillation is the correct
answer.
C. A broken passive tap connector.
D. Incorrect color coding on the coaxial jacket.
Rationale: Setting the gain too high on an amplifier increases
the system's thermal noise floor, which can cause severe
desensitization to the donor site receiver, disrupting public safety
transmissions.
10. What type of test equipment is explicitly required to measure
the Voltage Standing Wave Ratio (VSWR) and distance-to-fault
(DTF) along a newly installed transmission line?
A. Digital Multimeter
B. Sound Level Meter
C. Cable and Antenna Analyzer / Vector Network
Analyzer is the correct answer.
D. Oscilloscope
Rationale: A Cable and Antenna Analyzer (often called a
SiteHawk or Anritsu Site Master) uses Frequency Domain
Reflectometry to measure VSWR, return loss, and precise
distance-to-fault locations on RF cables.
11. During a system verification test, the fire marshal demands a visual
demonstration of the system's dedicated trouble signals. Which
alarm condition is NOT required to be supervised by the building’s
fire alarm control panel?
A. Loss of normal AC power.
B. BDA component malfunction/failure.
C. Low battery capacity (below 70%).
D. High ambient temperature in the BDA room is the
correct answer.
Rationale: Code dictates tracking specific dedicated alarms:
AC power failure, donor antenna trouble, BDA malfunction, and
CERTIFICATION EXAM PREP COMPLETE
150 Q and A BANK
NICET IB-PSC Level II Practice Exam
1. A technician is conducting a grid test for an Emergency Radio
Coverage Enhancement System (ERCES) in a 10-story building.
According to NFPA 1221 and IFC 510, what is the minimum
required signal strength that must be measured across 95% of the
designated areas?
A. -85 dBm
B. -95 dBm
C. -105 dBm is the correct answer.
D. -115 dBm
Rationale: Both NFPA 1221 and the International Fire Code
(IFC) Section 510 establish that a minimum signal strength of -
105 dBm is mandatory for both inbound and outbound radio
communications across 95% of the floor areas.
2. During a routine inspection of a Class B Bi-Directional Amplifier
(BDA), the technician notes the system is oscillating. Which of the
following field adjustments is the most effective immediate fix to
eliminate oscillation while maintaining system integrity?
A. Increase the uplink attenuation.
B. Decrease the donor antenna height.
C. Increase attenuation on both uplink and downlink to
ensure the isolation is at least 20 dB greater than the
maximum gain is the correct answer.
D. Swap the donor antenna with an omnidirectional antenna.
Rationale: To prevent feedback loops and oscillation in a BDA
system, the structural isolation between the donor antenna and
the distributed antennas must be at least 20 dB higher than the
operating gain of the amplifier.
3. When installing coaxial cable for a public safety DAS in a vertical
riser, what is the minimum fire-resistance rating required for the
, enclosure protecting the cable backbone according to NFPA code?
A. 1 hour
B. 2 hours is the correct answer.
C. 3 hours
D. No rating is required if plenum cable is used.
Rationale: NFPA regulations mandate that the backbone
cables for public safety communication systems must be protected
by a 2-hour fire-rated enclosure or consist of 2-hour fire-rated
cables to ensure survival during an active fire.
4. A public safety responder radio system utilizes a donor antenna
aimed at a remote public safety communication tower. If the donor
antenna experiences significant physical misalignment due to a
severe windstorm, which system metric will show the most
immediate degrading impact?
A. VSWR at the dummy load.
B. Downlink Received Signal Strength Indicator (RSSI)
and Carrier-to-Interference-plus-Noise Ratio (CINR) is
the correct answer.
C. 120VAC input current draw.
D. Class A filter bandpass width.
Rationale: Physical misalignment of a highly directional
donor antenna directly degrades the line-of-sight path to the
donor tower, causing a severe drop in the downlink RSSI and RF
signal quality (CINR).
5. Which type of NEMA enclosure is strictly required by IFC 510 for
housing the central processing units, power supplies, and bi-
directional amplifiers of an in-building public safety radio
enhancement system?
A. NEMA 1
B. NEMA 3R
C. NEMA 4 or NEMA 4X is the correct answer.
D. NEMA 12
Rationale: Fire codes explicitly require all primary ERCES
equipment (BDAs, battery backups) to be housed in NEMA 4 or
4X weatherproof, dust-tight, and water-spray resistant
enclosures painted red.
6. While calculating the link budget for an ERCES installation, a
technician must factor in the attenuation of 1/2-inch coaxial cable.
, If a run of 200 feet has a spec loss of 2.5 dB per 100 feet at 800
MHz, what is the total cable loss?
A. 2.5 dB
B. 5.0 dB is the correct answer.
C. 7.5 dB
D. 10.0 dB
Rationale: Total loss is calculated by multiplying the length
by the loss per unit. 200 feet at 2.5 dB per 100 feet equals exactly
5.0 dB of RF attenuation.
7. What is the fundamental operational difference between a Class A
and a Class B Bi-Directional Amplifier used in public safety
communications?
A. Class A filters narrow individual channels, while Class
B filters broader passbands encompassing multiple
channels is the correct answer.
B. Class A operates on DC power, while Class B operates
exclusively on AC power.
C. Class A is for outdoor use, while Class B is strictly for indoor use.
D. Class A handles analog signals, while Class B handles P25 Phase
II digital signals.
Rationale: Class A channelized amplifiers target specific,
narrow radio frequencies (typically 12.5 to 25 kHz wide), whereas
Class B amplifiers process wide blocks of frequencies
(broadband), making Class B more prone to amplifying out-of-
band noise.
8. According to NFPA rules, the secondary power supply (Battery
Backup System) for an in-building public safety radio
enhancement system must be capable of operating at 100%
capacity for a minimum of how many hours?
A. 4 hours
B. 12 hours
C. 24 hours is the correct answer.
D. 48 hours
Rationale: NFPA 1221 and IFC 510 require the autonomous
backup battery system to support continuous, full-load operation
of the ERCES system for at least 24 hours during a primary
power outage.
, 9. A technician connects a spectrum analyzer to the test port of a
downlink BDA and observes an elevated noise floor even when no
active radios are transmitting in the building. What is the most
likely cause of this phenomenon?
A. The donor tower is turned off.
B. Excessive uplink or downlink gain causing thermal
noise amplification or system oscillation is the correct
answer.
C. A broken passive tap connector.
D. Incorrect color coding on the coaxial jacket.
Rationale: Setting the gain too high on an amplifier increases
the system's thermal noise floor, which can cause severe
desensitization to the donor site receiver, disrupting public safety
transmissions.
10. What type of test equipment is explicitly required to measure
the Voltage Standing Wave Ratio (VSWR) and distance-to-fault
(DTF) along a newly installed transmission line?
A. Digital Multimeter
B. Sound Level Meter
C. Cable and Antenna Analyzer / Vector Network
Analyzer is the correct answer.
D. Oscilloscope
Rationale: A Cable and Antenna Analyzer (often called a
SiteHawk or Anritsu Site Master) uses Frequency Domain
Reflectometry to measure VSWR, return loss, and precise
distance-to-fault locations on RF cables.
11. During a system verification test, the fire marshal demands a visual
demonstration of the system's dedicated trouble signals. Which
alarm condition is NOT required to be supervised by the building’s
fire alarm control panel?
A. Loss of normal AC power.
B. BDA component malfunction/failure.
C. Low battery capacity (below 70%).
D. High ambient temperature in the BDA room is the
correct answer.
Rationale: Code dictates tracking specific dedicated alarms:
AC power failure, donor antenna trouble, BDA malfunction, and
