MISSISSIPPI COMMUNICATION SYSTEMS
CONTRACTOR EXAM|350 PRACTICE
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES LATEST UPDATE ALREADY
GRADED A+ ASSURED PASS
The Mississippi Communication Systems, Low Voltage Electrical contractor
examination is administered by PSI Services LLC on behalf of the Mississippi
State Board of Contractors (MSBOC). This is an open-book exam consisting of 50
multiple-choice questions with a two-hour time limit and a 70% passing score
required. The exam covers six primary subject areas: sound and communications,
services and overcurrent protection, conductors and raceways, general knowledge
and calculations, grounding and bonding, and power supplies. This classification
covers energy-limited communication and low-voltage systems not exceeding 91
volts, including telephone systems, sound systems, cable television, computer
installations, closed-circuit video, music systems, and satellite dish antennas — but
excludes alarm systems. Permitted reference materials include the 2020 National
Electrical Code, Code of Federal Regulations Title 47, Telecommunications Wiring
by Clyde N. Herrick, and other approved texts.
The following 350 practice questions are organized with randomized correct
answers and detailed rationales to prepare candidates for all subject areas tested on
the Mississippi Communication Systems exam.
SUBJECT AREA 1: SOUND AND COMMUNICATIONS
1. Which of the following systems is expressly covered under the Mississippi
Communication Systems classification?
,A. Fire alarm systems
B. Closed-circuit video systems
C. HVAC control systems
D. Elevator motor circuits
Correct Answer: B
Rationale: The MSBOC classification specifically lists closed-circuit video as an
example of covered low-voltage work. Low-voltage alarm systems are explicitly
excluded from this classification.
2. According to NEC Article 100, "readily accessible" means:
A. Accessible after removal of a panel cover only
B. Capable of being reached quickly without using tools
C. Accessible only by qualified personnel
D. Accessible only after lockout-tagout
Correct Answer: B
Rationale: NEC Article 100 defines "readily accessible" as capable of being
reached quickly for operation, renewal, or inspections without requiring those to
whom ready access is requisite to climb over or remove obstacles or to resort to
portable ladders.
3. What is the maximum voltage threshold for the Mississippi Communication
Systems, Low Voltage Electrical classification?
A. 50 volts
B. 75 volts
C. 91 volts
D. 120 volts
Correct Answer: C
Rationale: The MSBOC classification covers energy-limited communication and
low-voltage systems that do not exceed 91 volts.
,4. In a 70-volt speaker distribution system, which transformer tap provides
the highest output power to a single speaker?
A. 16 Ω tap
B. 8 Ω tap
C. 4 Ω tap
D. 2 Ω tap
Correct Answer: D
Rationale: The lowest impedance tap (2 Ω) allows the most current to flow,
delivering the highest power to a single speaker in a constant-voltage speaker
system.
5. According to TIA-568 standards, "horizontal cabling" connects the:
A. Building entrance to the main cross-connect
B. Main cross-connect to the intermediate cross-connect
C. Telecommunications room to the work area outlet
D. Work area outlet to the end equipment
Correct Answer: C
Rationale: Horizontal cabling is the permanent cable run from the patch panel in
the Telecommunications Room (TR) to the telecommunications outlet in the work
area.
6. What is the primary safety concern when working on aerial telephone cable
lines?
A. Sun exposure
B. Contact with parallel power lines
C. The height of the cable
D. The weight of the cable
Correct Answer: B
, Rationale: Contact with parallel power lines is an extreme electrocution hazard.
Communication lines are often strung on the same poles as high-voltage power
lines.
7. Which of the following is NOT a standard telecommunications outlet
recognized by TIA-568?
A. RJ-11
B. RJ-45
C. LC Duplex
D. BNC
Correct Answer: D
Rationale: RJ-11, RJ-45, and LC Duplex are standard telecommunications outlets.
BNC is a coaxial connector primarily used in video and RF applications, not a
standard TIA-568 telecommunications outlet.
8. "Backbone cabling" in a structured cabling system provides
interconnection between:
A. The work area and the floor distributor
B. Telecommunications rooms, equipment rooms, and entrance facilities
C. The patch panel and the switch
D. The computer and the outlet
Correct Answer: B
Rationale: Backbone cabling (also called vertical or riser cabling) runs between
floors and buildings, connecting the various distribution points of the structured
cabling system.
9. Power over Ethernet (PoE) as defined by IEEE 802.3bt can deliver up to
how much power?
CONTRACTOR EXAM|350 PRACTICE
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES LATEST UPDATE ALREADY
GRADED A+ ASSURED PASS
The Mississippi Communication Systems, Low Voltage Electrical contractor
examination is administered by PSI Services LLC on behalf of the Mississippi
State Board of Contractors (MSBOC). This is an open-book exam consisting of 50
multiple-choice questions with a two-hour time limit and a 70% passing score
required. The exam covers six primary subject areas: sound and communications,
services and overcurrent protection, conductors and raceways, general knowledge
and calculations, grounding and bonding, and power supplies. This classification
covers energy-limited communication and low-voltage systems not exceeding 91
volts, including telephone systems, sound systems, cable television, computer
installations, closed-circuit video, music systems, and satellite dish antennas — but
excludes alarm systems. Permitted reference materials include the 2020 National
Electrical Code, Code of Federal Regulations Title 47, Telecommunications Wiring
by Clyde N. Herrick, and other approved texts.
The following 350 practice questions are organized with randomized correct
answers and detailed rationales to prepare candidates for all subject areas tested on
the Mississippi Communication Systems exam.
SUBJECT AREA 1: SOUND AND COMMUNICATIONS
1. Which of the following systems is expressly covered under the Mississippi
Communication Systems classification?
,A. Fire alarm systems
B. Closed-circuit video systems
C. HVAC control systems
D. Elevator motor circuits
Correct Answer: B
Rationale: The MSBOC classification specifically lists closed-circuit video as an
example of covered low-voltage work. Low-voltage alarm systems are explicitly
excluded from this classification.
2. According to NEC Article 100, "readily accessible" means:
A. Accessible after removal of a panel cover only
B. Capable of being reached quickly without using tools
C. Accessible only by qualified personnel
D. Accessible only after lockout-tagout
Correct Answer: B
Rationale: NEC Article 100 defines "readily accessible" as capable of being
reached quickly for operation, renewal, or inspections without requiring those to
whom ready access is requisite to climb over or remove obstacles or to resort to
portable ladders.
3. What is the maximum voltage threshold for the Mississippi Communication
Systems, Low Voltage Electrical classification?
A. 50 volts
B. 75 volts
C. 91 volts
D. 120 volts
Correct Answer: C
Rationale: The MSBOC classification covers energy-limited communication and
low-voltage systems that do not exceed 91 volts.
,4. In a 70-volt speaker distribution system, which transformer tap provides
the highest output power to a single speaker?
A. 16 Ω tap
B. 8 Ω tap
C. 4 Ω tap
D. 2 Ω tap
Correct Answer: D
Rationale: The lowest impedance tap (2 Ω) allows the most current to flow,
delivering the highest power to a single speaker in a constant-voltage speaker
system.
5. According to TIA-568 standards, "horizontal cabling" connects the:
A. Building entrance to the main cross-connect
B. Main cross-connect to the intermediate cross-connect
C. Telecommunications room to the work area outlet
D. Work area outlet to the end equipment
Correct Answer: C
Rationale: Horizontal cabling is the permanent cable run from the patch panel in
the Telecommunications Room (TR) to the telecommunications outlet in the work
area.
6. What is the primary safety concern when working on aerial telephone cable
lines?
A. Sun exposure
B. Contact with parallel power lines
C. The height of the cable
D. The weight of the cable
Correct Answer: B
, Rationale: Contact with parallel power lines is an extreme electrocution hazard.
Communication lines are often strung on the same poles as high-voltage power
lines.
7. Which of the following is NOT a standard telecommunications outlet
recognized by TIA-568?
A. RJ-11
B. RJ-45
C. LC Duplex
D. BNC
Correct Answer: D
Rationale: RJ-11, RJ-45, and LC Duplex are standard telecommunications outlets.
BNC is a coaxial connector primarily used in video and RF applications, not a
standard TIA-568 telecommunications outlet.
8. "Backbone cabling" in a structured cabling system provides
interconnection between:
A. The work area and the floor distributor
B. Telecommunications rooms, equipment rooms, and entrance facilities
C. The patch panel and the switch
D. The computer and the outlet
Correct Answer: B
Rationale: Backbone cabling (also called vertical or riser cabling) runs between
floors and buildings, connecting the various distribution points of the structured
cabling system.
9. Power over Ethernet (PoE) as defined by IEEE 802.3bt can deliver up to
how much power?
