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NCTI MTIII (Questions & Solutions)
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NCTI MTIII (Questions & Solutions)The number of rectifiers used in DC power plant design Correct Ans -
Is dependent upon the load place on the system.
What is true of online uninterruptible power supply (UPS) system?
Correct Ans - They are recommended for commercial applications such as
data centers and telecommunications operations.
Which of these are concerns for radio frequency over grass (RFoG) and, fiber-
to-the-x (FTTx) Correct Ans - Consideration of how and who will
provide AC power to the optical network terminal (ONT) at the customer
premises.
What is true of the following types of uninterruptible power supplies (UPS)?
Correct Ans - The offline type routes incoming power directly to connected
devices and switches to battery backup during a power interruption.
Why are backup AC generators included in many commercial AC
uninterruptible power supply (UPS) and DC power systems? Correct Ans
- To provide AC power in the event of a prolonged utility power
interruption.
Why is -48 VDC ( volts of direct current ) whit a positive ground used by the
telecommunications industry ? Correct Ans - This reverse polarity is a
means of mitigating electrolytic corrosion on the outside plant.
Which of the following is true of a centralized power node ? Correct Ans -
It can provide sufficient power for a fiber-optic node, including plant
amplifiers and customer premises network interface devices ( NID) for
telephony services.
What is an option available on most optical nodes for connecting to the power
supply? Correct Ans - Through a power cable that is connected from
the power supply directly to the power port of the node.
Why do many optical nodes accept two independent power supplies?
Correct Ans - For redundant powering of the node.
, In a hybrid fiber/coax (HFC) fiber optic node, what are common voltages
produced by DC power supplies? Correct Ans - Common voltage
produced by DC power supplies include +5, +12, and +24 VDC.
Which type of fusion Spicer is ideal for fiber - to - the - x ( FTTx) splicing ?
Correct Ans - The fixed V-groove splicer.
What are some prerequisites before performance a fusion splice of optical
fiber ? Correct Ans - A controlled environment such as a splicing van,
trailer, or tent and a stable work surface that is large enough to accommodate
the fusion splicer, tools, and the splice closure.
When would a mid-entry splice is a fiber-optic network be used ? Correct
Ans - In a self-healing ring network that requires only two fibers to feed an
optical fiber drop.
What is required of mechanical splices used for acceptance testing ?
Correct Ans - A mechanical splice used for acceptance testing should be
simple to use and reusable .
Why are Velcro straps preferred over standard plastic tie wraps when
bundling pigtails for storage in a splice panel ? Correct Ans - Because
Velcro straps are removable and can hold the pigtails together without placing
undue strain on the optical fibers.
When preparing fiber-optic cable for connection to a patch panel, how much
buffer tube and fiber slacks should be provide ? Correct Ans - leave
enough slack in the buffer tubes to allow the splice trays to reach the splicing
equipment and enough fiber slack to store on individuals trays for later
additions, moves, and changes.
If tight-buffered distribution fiber-optic cable is installed between the master
splice panel in an optical entrance enclosure (0EE) and a rack-mounted fiber-
optic distribution panel, where in the facility must the distribution panel be
located? Correct Ans - The distribution panel can be located anywhere
in the facility since the distribution cable complies with indoor code
requirements for rise or plenum installations.
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