Maintenance Tech I-II Conventional
EXAM QUESTIONS WITH ANSWERS
What advantage is realized by increasing the voltage in a
broadband cable network from 60 volts alternating
current (VAC) to 90 volts? - CORRECT ANSWERS
✔✔Operating with 50% more voltage reduces the voltage
drop and current drawn in the network for more efficient
power utilization.
How does surge protection at the input and output of a
ferroresonant power supply defend against voltage
surges? - CORRECT ANSWERS ✔✔By passing voltage
surges (within the surge device rating) to ground without
damage.
Which part of a ferroresonant transformer regulates the
load on the secondary winding? - CORRECT ANSWERS
✔✔The magnetic shunt.
In a standby network power supply, what comes online to
convert the battery voltage to alternating current (AC),
which then goes to the ferroresonant transformer? -
CORRECT ANSWERS ✔✔The battery-powered inverter.
,In a power inserter with three filtering networks, what is
the purpose of the high-pass filter? - CORRECT ANSWERS
✔✔To prevent the 60 hertz (Hz) alternating current (AC)
from passing between the two radio frequency (RF)/AC
ports.
What inserts alternating current (AC) into the network
with a direct connection to an amplifier rather than using
a power inserter? - CORRECT ANSWERS ✔✔The amplifier
AC circuitry.
What is the advantage for supplying alternating current
(AC) to multiple amplifiers from one network power
supply? - CORRECT ANSWERS ✔✔Allows the designer to
place amplifiers without concern about access to
electrical utility power.
Where is a clamp-on ammeter attached to measure the
output current from a network power supply? - CORRECT
ANSWERS ✔✔Clamped around the conductor attached to
the lug that tightens down on the coaxial cable connector
pin.
What is a priority in any standby power supply
maintenance program? - CORRECT ANSWERS ✔✔Battery
care.
, What is the voltage into the second amplifier in cascade,
if each amplifier draws 1.5 amps of current, the loop
resistance of each section of cable is 1.38 ohms, and the
alternating current (AC) source is a 90 volts AC (VAC)
network power supply? - CORRECT ANSWERS ✔✔83.77
VAC.
What enables set-top boxes (STB) and Data Over Cable
Service Interface Specification (DOCSIS) modems to
operate as completely separate systems that operate
independent of each other? - CORRECT ANSWERS ✔✔STB
and DOCSIS modems are assigned different upstream
channels with dedicated receivers in the headend.
What did the 1.1 version of the Data Over Cable Service
Interface Specification (DOCSIS) introduce, incorporating
solutions for transporting real-time data applications
(such as voice traffic) over the cable operator's managed
IP network, and doing so with quality comparable to that
of the telephone company? - CORRECT ANSWERS
✔✔PacketCable.
Why is 38 MHz typically the highest frequency in the sub-
band frequency that is used for upstream modem
transmissions? - CORRECT ANSWERS ✔✔The upper edge
of the sub-band frequency spectrum is prone to group
delay caused by the diplex filters.
EXAM QUESTIONS WITH ANSWERS
What advantage is realized by increasing the voltage in a
broadband cable network from 60 volts alternating
current (VAC) to 90 volts? - CORRECT ANSWERS
✔✔Operating with 50% more voltage reduces the voltage
drop and current drawn in the network for more efficient
power utilization.
How does surge protection at the input and output of a
ferroresonant power supply defend against voltage
surges? - CORRECT ANSWERS ✔✔By passing voltage
surges (within the surge device rating) to ground without
damage.
Which part of a ferroresonant transformer regulates the
load on the secondary winding? - CORRECT ANSWERS
✔✔The magnetic shunt.
In a standby network power supply, what comes online to
convert the battery voltage to alternating current (AC),
which then goes to the ferroresonant transformer? -
CORRECT ANSWERS ✔✔The battery-powered inverter.
,In a power inserter with three filtering networks, what is
the purpose of the high-pass filter? - CORRECT ANSWERS
✔✔To prevent the 60 hertz (Hz) alternating current (AC)
from passing between the two radio frequency (RF)/AC
ports.
What inserts alternating current (AC) into the network
with a direct connection to an amplifier rather than using
a power inserter? - CORRECT ANSWERS ✔✔The amplifier
AC circuitry.
What is the advantage for supplying alternating current
(AC) to multiple amplifiers from one network power
supply? - CORRECT ANSWERS ✔✔Allows the designer to
place amplifiers without concern about access to
electrical utility power.
Where is a clamp-on ammeter attached to measure the
output current from a network power supply? - CORRECT
ANSWERS ✔✔Clamped around the conductor attached to
the lug that tightens down on the coaxial cable connector
pin.
What is a priority in any standby power supply
maintenance program? - CORRECT ANSWERS ✔✔Battery
care.
, What is the voltage into the second amplifier in cascade,
if each amplifier draws 1.5 amps of current, the loop
resistance of each section of cable is 1.38 ohms, and the
alternating current (AC) source is a 90 volts AC (VAC)
network power supply? - CORRECT ANSWERS ✔✔83.77
VAC.
What enables set-top boxes (STB) and Data Over Cable
Service Interface Specification (DOCSIS) modems to
operate as completely separate systems that operate
independent of each other? - CORRECT ANSWERS ✔✔STB
and DOCSIS modems are assigned different upstream
channels with dedicated receivers in the headend.
What did the 1.1 version of the Data Over Cable Service
Interface Specification (DOCSIS) introduce, incorporating
solutions for transporting real-time data applications
(such as voice traffic) over the cable operator's managed
IP network, and doing so with quality comparable to that
of the telephone company? - CORRECT ANSWERS
✔✔PacketCable.
Why is 38 MHz typically the highest frequency in the sub-
band frequency that is used for upstream modem
transmissions? - CORRECT ANSWERS ✔✔The upper edge
of the sub-band frequency spectrum is prone to group
delay caused by the diplex filters.
