VOICE DATA VIDEO VDV COMPREHENSIVE EXAM 2025
QUESTIONS WITH SOLUTIONS RATED A+
✔✔___ problems are the number one cause of problems within a VDV system.
a. Cable
b. EMI
c. RFI
d. none of the above - ✔✔a. Cable
✔✔T/F
EMI and RFI problems can be reduced by using shielded cables and proper separation
of VDV cables from power cables and other electrical loads that produce EMI. - ✔✔True
✔✔Knowing the length of VDV cable is important because VDV cable, like all
conductors, has __ that reduces the amount of power passed through the cable.
a. conductivity
b. copper
c. insulation
d. resistance - ✔✔d. resistance
✔✔A(n) ____ test is used to ensure that a cable is properly terminated to the correct
terminals and that there are not any wires left unconnected or connected to the wrong
terminal.
a. attenuation
b. NEXT
c. resistance
d. wire map - ✔✔d. wire map
✔✔T/F
The source of crosstalk is typically from another pair of wires in the same group or from
another, adjacent group of wires. - ✔✔true
✔✔A(n) _____ test is a test that measures the time, (in nS), required for a signal to
travel the length of a cable pair.
a. attenuation
b. delay skew
c. NEXT
d. propagation delay - ✔✔d. propagation delay
✔✔A ____ reads the size, shape, and return time of reflected pulses to identify the type
of problem.
a. cable fault locator
b. oscilloscope
c. SWR meter
, d. Time Domain Reflectometer - ✔✔d. Time Domain Reflectometer
✔✔How much variance in the length measurements between twisted pairs should be
expected?
a. Expect a 1% to 3% difference between twisted pairs.
b. Expect a 2% to 5% difference between twisted pairs.
c. Expect a 5% to 8% difference between twisted pairs.
d. Expect a 5% to 10% difference between twisted pairs. - ✔✔b. Expect a 2% to 5%
difference between twisted pairs.
✔✔A(n) ____ wire is any conductor (cable or wire) that has an unwanted low resistance
path between two conductors or to ground.
a. open
b. shorted
c. split
d. all of the above - ✔✔b. shorted
✔✔A(n) ____ cable pair occurs when two common cable pairs are connected at the
terminals of another.
a. crossed
b. open
c. reversed
d. shorted - ✔✔a. crossed
✔✔A tone generator is a test instrument that is used to place a tone on a cable that can
be received by a(n) ____ at the other end of the cable.
a. amplified probe
b. Butt Set
c. frequency counter
d. TDR - ✔✔a. amplified probe
✔✔T/F
Cable fault analyzers display information in numerical values, in words (PASS or FAIL),
or with graphic displays - ✔✔true
✔✔T/F
When using a cable fault analyzer, it is important to have the current manufacturer's
reference points established. - ✔✔true
✔✔___is a method of using light to transport information from one location to another
through thin filaments of glass or plastic
a. Fiber optics
b. Internet Protocol (IP)
c. Transmission Control Protocol (TCP)
QUESTIONS WITH SOLUTIONS RATED A+
✔✔___ problems are the number one cause of problems within a VDV system.
a. Cable
b. EMI
c. RFI
d. none of the above - ✔✔a. Cable
✔✔T/F
EMI and RFI problems can be reduced by using shielded cables and proper separation
of VDV cables from power cables and other electrical loads that produce EMI. - ✔✔True
✔✔Knowing the length of VDV cable is important because VDV cable, like all
conductors, has __ that reduces the amount of power passed through the cable.
a. conductivity
b. copper
c. insulation
d. resistance - ✔✔d. resistance
✔✔A(n) ____ test is used to ensure that a cable is properly terminated to the correct
terminals and that there are not any wires left unconnected or connected to the wrong
terminal.
a. attenuation
b. NEXT
c. resistance
d. wire map - ✔✔d. wire map
✔✔T/F
The source of crosstalk is typically from another pair of wires in the same group or from
another, adjacent group of wires. - ✔✔true
✔✔A(n) _____ test is a test that measures the time, (in nS), required for a signal to
travel the length of a cable pair.
a. attenuation
b. delay skew
c. NEXT
d. propagation delay - ✔✔d. propagation delay
✔✔A ____ reads the size, shape, and return time of reflected pulses to identify the type
of problem.
a. cable fault locator
b. oscilloscope
c. SWR meter
, d. Time Domain Reflectometer - ✔✔d. Time Domain Reflectometer
✔✔How much variance in the length measurements between twisted pairs should be
expected?
a. Expect a 1% to 3% difference between twisted pairs.
b. Expect a 2% to 5% difference between twisted pairs.
c. Expect a 5% to 8% difference between twisted pairs.
d. Expect a 5% to 10% difference between twisted pairs. - ✔✔b. Expect a 2% to 5%
difference between twisted pairs.
✔✔A(n) ____ wire is any conductor (cable or wire) that has an unwanted low resistance
path between two conductors or to ground.
a. open
b. shorted
c. split
d. all of the above - ✔✔b. shorted
✔✔A(n) ____ cable pair occurs when two common cable pairs are connected at the
terminals of another.
a. crossed
b. open
c. reversed
d. shorted - ✔✔a. crossed
✔✔A tone generator is a test instrument that is used to place a tone on a cable that can
be received by a(n) ____ at the other end of the cable.
a. amplified probe
b. Butt Set
c. frequency counter
d. TDR - ✔✔a. amplified probe
✔✔T/F
Cable fault analyzers display information in numerical values, in words (PASS or FAIL),
or with graphic displays - ✔✔true
✔✔T/F
When using a cable fault analyzer, it is important to have the current manufacturer's
reference points established. - ✔✔true
✔✔___is a method of using light to transport information from one location to another
through thin filaments of glass or plastic
a. Fiber optics
b. Internet Protocol (IP)
c. Transmission Control Protocol (TCP)
