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Purdue Global University *
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273
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Electrical Engineering
Date
Feb 20, 2024
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docx
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9
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Individual ResponsesObjective Analysis
Question 1.
Correct
Which of the following are advantages of using fiber optic cabling for a network? (Select two.)
answer
Correct Answer:
Greater cable distances without a repeater
Easy to work with
Lower installation cost
Correct Answer:
Immunity to electromagnetic interference
No special training or equipment is required
Explanation
Compared to other types of cabling, fiber optic cabling allows greater cable distances without a repeater
and is immune to electromagnetic interference. However, it is more costly, difficult to work with, and specialized training and equipment is required for installation.
References
o
3.2.2 Fiber Optic Facts
q_fiber_cables_advantage_np6.question.fex
Question 2.
Correct
Which of the following connectors are used with fiber optic cables and include both cables in a single connector? (Select two.)
answer
BNC
Correct Answer:
LC
ST
SC
Correct Answer:
MTRJ
Explanation
LC and MTRJ connectors have both fiber optic cables in a single connector.
ST and SC connectors hold a single strand of fiber optic cabling. A cable using either one has two connectors on each end.
A BNC connector is used with coaxial cable.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
o
3.4.4 Fiber Optic Wiring Troubleshooting Facts
q_fiber_cables_connector_np6.question.fex
Question 3.
Correct
Which of the following cables offers the best protection against EMI?
answer
Correct Answer:
Single-mode fiber optic
Cat 5e
RG-6
Cat 5
Explanation
Fiber optic cables offer the best protection against electromagnetic interference (EMI).
References
o
3.2.2 Fiber Optic Facts
q_fiber_cables_emi_np6.question.fex
Question 4.
Correct
Which of the following are characteristics of an LC fiber optic connector? (Select two.)
answer
They are threaded.
They can be used with either fiber optic or copper cabling.
Correct Answer:
They use a housing and latch system similar to an RJ45 UTP connector.
Correct Answer:
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They are half the size of standard connectors.
They use a one-piece bayonet connecting system.
Explanation
LC fiber optic connectors are small, at about half the size of other fiber optic connectors. Their appearance is similar to a typical RJ45 connector used with UTP wiring. Like an RJ45 connector, an LC fiber optic connector uses a small latch to lock the connector in a jack.
ST uses a one-piece bayonet connecting system.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
o
3.4.4 Fiber Optic Wiring Troubleshooting Facts
q_fiber_cables_lc_01_np6.question.fex
Question 5.
Correct
Which of the following connectors is used with fiber optic cables and requires that you use a twisting motion to connect it?
answer
F-type
Correct Answer:
ST
SC
BNC
Explanation
An ST connector is used with fiber optic cables and uses a twist-type connector. Use the mnemonic S
et and T
wist.
An SC connector is used with fiber optic cables, but you plug it in instead of twist it in.
F-type and BNC connectors employ a twist to connect, but they're used with coaxial cables.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
o
3.4.4 Fiber Optic Wiring Troubleshooting Facts
q_fiber_cables_lc_02_np6.question.fex
Question 6.
Correct
Which of the following are characteristics of an MTRJ fiber optic connector? (Select two.)
answer
They must never be used with single-mode fiber optic cables.
Correct Answer:
They use metal guide pins to ensure accurate alignment.
They're called push-in-and-twist connectors.
Correct Answer:
They can be used with multi-mode fiber optic cables.
They use a keyed bayonet.
Explanation
MTRJ connectors can be used with either multi-mode or single-mode fiber optic cabling. The connector is made from plastic and uses metal guide pins to ensure that it's properly aligned in the jack.
ST has a keyed bayonet connector and is called a push-in-and-twist connector.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
o
3.4.4 Fiber Optic Wiring Troubleshooting Facts
q_fiber_cables_mtrj_np6.question.fex
Question 7.
Correct
Multi-mode fiber is designed to operate at which of the following wavelengths?
answer
1310 nm and 1550 nm
Correct Answer:
850 nm and 1300 nm
1300 nm and 1550 nm
850 nm and 1310 nm
Explanation
Multi-mode fiber is designed to operate at 850 nm and 1300 nm.
Single-mode fiber is optimized for 1310 nm and 1550 nm.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
q_fiber_cables_multi_np6.question.fex
Question 8.
Correct
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Which of the following connectors usually require polishing as part of the assembly process? (Select two.)
answer
Correct Answer:
SC
Correct Answer:
ST
RJ45
BNC
F-type
Explanation
The fiber optic cable assembly process is more complex than other assemblies. It's necessary to polish the exposed fiber tip to ensure that light is passed from one cable to the next with minimal dispersion.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
o
3.4.4 Fiber Optic Wiring Troubleshooting Facts
q_fiber_cables_polish_np6.question.fex
Question 9.
Correct
Which of the following is true about single-mode fiber optic network cabling?
answer
It has shorter segment lengths than multi-mode fiber optic cabling.
It's less expensive than multi-mode fiber optic cabling.
Correct Answer:
Its central core is smaller than the standard multi-mode fiber optic cabling core.
It's optimized for 850 nm and 1300 nm light sources.
Explanation
Single-mode fiber optic cabling provides one path (or mode) for light to travel. It supports longer transmission distances than multi-mode fiber optic cabling, and it's also more expensive.
Single-mode cabling also has a central core that's much smaller than the standard multi-mode fiber optic
cabling core.
Single-mode fiber cabling is optimized for 1310 nanometer (nm) and 1550 nm light sources.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
q_fiber_cables_single_01_np6.question.fex
Question 10.
Correct
Which type of optical fiber is normally used to connect two buildings that are several kilometers apart?
answer
Multi-mode fiber
Shielded twisted pair
Correct Answer:
Single-mode fiber
Coaxial cable
Explanation
In this scenario, you would use single-mode fiber optic cables. Fiber optic is graded as single-mode or multi-mode. Single-mode consists of a very thin singular core, which produces fewer reflections. This provides greater effective bandwidth over greater distances.
Multi-mode is less costly than single-mode fiber. Multi-mode is used to transmit over shorter distances, as the rays tend to disperse as the transmission distance increases.
Coaxial and shielded twisted pair are not suitable for long distances between buildings.
References
o
3.2.1 Fiber Optic
o
3.2.2 Fiber Optic Facts
q_fiber_cables_single_02_np6.question.fex
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