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1. For comparison purposes, it is common to express the
bandwidth of an analog communications system as a percentage of its
carrier frequency.
A. Bandwidth Utilization RatioB. Frequency Utilization RatioC.
Carrier frequency percentage ratioD. Bandwidth percentage ratio
Answer: A
2. In 1988, the American National Standards Institute (ANSI)
published the _______.
A. Asynchronous Optical NetworkB. Synchronous Optical NetworkC.
Synchronous Digital HierarchyD. Asynchronous Digital Hierarchy
Answer: B
3. The _____________ in metallic cables cause them to act like
low-pass filters,which limit their transmission frequencies,
bandwidth, bit rate, and information-carrying capacity.
A. InsulatorsB. Secondary electrical constantC. Primary
electrical constantD. Conductors
Answer: C
4. The coating protects the fiber from moisture, which reduces
the possibility of the occurrence of a detrimental phenomenon
caused by high humidity. This phenomenon is known as:
A. RustingB. Stress corrosion
C. Fiber sensitivityD. Fiber discoloration
Answer: B
5. What phenomenon can result if the glass fiber is exposed to
long periods of high humidity?
A. Static figureB. Fiber discolorationC. Stress corrosionD. both
A and C
Answer: D
6. It includes a steel central member and a layer of Mylar tape
wrap to increasethe cables tensile strength.
A. Coax fiber cableB. Strandless cable configurationC.
Multiple-strand cable configurationD. Single-strand cable
configuration
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Answer: C
7. What is the process of decaying from one energy level to
another energy level?
A. Electron-hole pairingB. Spontaneous delayC. Energy decayD.
Band gap collapse
Answer: B
8. The spectral separation of white light in this manner is
called
A. Prismatic refractionB. EvanescenceC. Rainbow effectD. Mirror
effect
Answer: A
9. In angular misalignment, a displacement less than 2deg will
have a typical loss of
A. 0.2 dBB. 0.5 dBC. 0.3 dBD. 0.4 dB
Answer: B
10. A process when mirror-like ends trap the photons in the
active region and, as they reflect back and forth, stimulate free
electrons to combine with holes ata higher-than-normal energy
level.
A. DrinkingB. Lasing
C. RayleighingD. Blanking
Answer: B
11. A loss due to the mechanical interface used to house the
light detector andattach it on cable that is not perfect and
therefore, prevents a small percentage of the power leaving the
cable from entering the light detector.
A. Cable bendsB. Cable-to-light detector interface lossC.
Splicing lossD. Coupling loss
Answer: B
12. Loss in cable sections that uses a splice that is not
perfect.
A. Cable bendsB. Cable-to-light detector interface lossC.
Splicing lossD. Coupling loss
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Answer: C
13. The following are parts of the optical spectrum, except
A. InfraredB. UltravioletC. Visible colorD. X-rays
Answer: D
14. In fiber-optic cable, the popular light wavelength is
A. 0.7 umB. 1.3 umC. 1.5 umD. 2.4 um
Answer: B
15. Also known as the energy given to or absorbed by an electron
that moves through a potential difference of one volt.
A. Energy gap
B. Potential differenceC. Ionization energyD. Electron-volt
Answer: D
16. It is the proportion of the power entering a coupler that is
lost inside thecoupler.
A. Absorption lossB. Radiation lossC. Excess lossD. Dissipation
loss
Answer: C
17. The smallest amount in which energy can exist. Its size
depends on the wavelength of the energy.
A. LightB. PhotonC. QuantumD. Calorie
Answer: C
18. _______________ is the synchronization of digital signals by
adding extra bits to one signal.
A. Bit stuffingB. SynchronizationC. AsynchronizationD.
Pleisynchronizing
Answer: A
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19. What is a 100 Mb/s LAN signaling standard intended for use
with fiber opticsbut also used with coaxial cable?
A. ISDNB. SONETC. FDDID. SDH
Answer: C
20. It is the use of fiber-optic cable for telephone subscriber
connections
A. Fiber to the buildingB. Fiber to the curbC. Fiber in the
loopD. Fiber in the box
Answer: C
21. It is the use of fiber for all telephone system except for
the subscriber loop.
A. Fiber to the buildingB. Fiber to the curb
C. Fiber in the loopD. Fiber in the box
Answer: B
22. Is defined as the calculation of received power in a system
in order to compare it with the power required for satisfactory
performance
A. Loss budgetB. Budget cutC. Loss marginD. Budget margin
Answer: A
23. Which laser is used as an energy source to excite electrons
into a higher energy state?
A. Hot laserB. Pump laserC. Arc laserD. Cold laser
Answer: B
24. Is referred as the time required for the voltage level at
the beginning of a
pulse to increase from 10% to 90% of its maximum value
A. periodB. Time constantC. Pulse widthD. Rise time
Answer: D
25. What do you call the single pulse that can travel through a
medium with no d
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ispersion?
A. UnitonsB. TrinitronsC. SolitonsD. Positrons
Answer: C
26. _______________ is the European standard for synchronous
transmission over afiber-optic network
A. FDDIB. SONETC. SDHD. PDH
Answer: C
27. ____________ is the North American standard for synchronous
transmission over a fiber-optic network.
A. FDDIB. SONET
C. SDHD. PDH
Answer: B
28. It is the use of two or more light sources at different
wavelengths, each separately modulated, with the same fiber
A. Code-division multiplexingB. Frequency-division
multiplexingC. Time-division multiplexingD. Wavelength-division
multiplexing
Answer: D
29. No material could have a refractive index of:
A. 1.5B. 1.6C. 1.1D. 0.9
Answer: D
30. The primary buffer:
A. reflects the light back into the core to allow propagation of
light down theoptic fiberB. must have a lower refractive index than
the coreC. is a plastic layer around the cladding to protect the
optic fiber from mechanical damageD. none of the above
Answer: C
31. As the meridional ray is propagated along the optic fiber,
it:
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A. travels in a sort of spiral shapeB. propagates always in the
center of the fiberC. passes repeatedly through the center of the
coreD. is reflected off the inside surface of the primary buffer.
This is called TIR
Answer: C
32. If the wavelength of the transmitted light were to be
decreased, the numberof modes would
A. increaseB. decreaseC. not changeD. halved in a graded index
fiber
Answer: A
33. A type of cable containing both copper conductor and optical
fiber is called:
A. an armored cableB. a dual grade cableC. tight jacketed
cable
D. a hybrid cable
Answer: D
34. A white fiber with a black tracer is most likely to be fiber
number
A. 18B. 16C. 13D. 12
Answer: A
35. If light is launched from a fiber with a core diameter of 50
um into a fiberof core 62.3 um diameter, the loss would be:
A. +1.9 dBB. zeroC. -1.9 dBD. 19 dB
Answer: B
36. What is cleaving?
A. removing the cladding before connecting fibers together
B. cutting the end of the fiber in preparation for connecting
two fibersC. cleaning the surface of optical fiberD. melting the
ends of the fiber
Answer: B
37. A tang is most likely to give rise to:
A. increased values of NAB. eccentricity
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C. amplificationD. gap loss
Answer: D
38. The typical monomode fiber core would have a
A. 40 umB. 50 nmC. 8 umD. 1 mm
Answer: C
39. The duration of main fusing arc is likely to be
A. 15 sB. 63.6 nsC. 10-20 minutesD. less than a second
Answer: A
40. Insertion loss for a mechanical splice is
A. -50 dBB. 0.2 dBC. 12 mmD. 3 dB
Answer: B
41. Total ports for a 4x4:
A. 16 portsB. 4 portsC. 7 ports
D. 8 ports
Answer: D
42. The laser of the safest type is referred to as:
A. infraredB. class 1C. class 0D. class 4
Answer: B
43. A typical value of tr for a laser would be
A. 3.5 nsB. 3 nmC. 80%D. 0.3 ns
Answer: D
44. Brown color in fiber optics represent what fiber number?
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A. 1B. 2C. 3D. 4
Answer: D
45. For fiber optics installation tension, the values start at
about _______ forlightweight internal cables
A. 100 NB. 10 000 NC. 10 ND. 1 N
Answer: A
46. For fiber optics installation tension, the tension value for
ruggedized cable is
A. 100 NB. 10 000 NC. 10 N
D. 1 N
Answer: B
47. For a lightweight cable the bending radius are about
________ for long termuse and ______ during installation
A. 50 mm; 70 mmB. 175 mm; 350 mmC. 200 nm; 390 nmD. 10 mm; 24
mm
Answer: A
48. For external armored cable bending radius are about ________
for long term use and _____ during installation
A. 50 mm; 70 mmB. 175 mm; 350 mmC. 200 nm; 390 nmD. 10 mm; 24
mm
Answer: B
49. The typical temperature range for fiber installation
A. 0 degC to +60 degCB. -30 degC to +70 degCC. -40 degC to +80
degCD. -100 degC to + 100degC
Answer: A
50. The typical temperature range for fiber operation
A. 0 degC to +60 degC
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B. -30 degC to +70 degCC. -40 degC to +80 degCD. -100 degC to +
100degC
Answer: B
51. The typical temperature range for fiber storage
A. 0 degC to +60 degCB. -30 degC to +70 degCC. -40 degC to +80
degCD. -100 degC to + 100degC
Answer: C
52. Multi-mode fibers come in a wide variety of core sizes, the
industry standard is now _______ using silica fiber
A. 62.5 umB. 0.25 mmC. 1 mmD. 25.7 mm
Answer: A
53. The all-plastic fibers range from 0.25 mm to 3 mm of which
______ is the most common
A. 62.5 umB. 0.25 mmC. 1 mmD. 25.7 mm
Answer: C
54. With an air gap, angles of misalignment up to 3 or 4 degrees
cause losses ofless than:
A. 1 dBB. 10 dBC. 1 dBD. -10 dB
Answer: A
55. Most splicers consider an end angle of better than about
_______ as satisfactory
A. 1 degB. 10 deg
C. 3 degD. 30 deg
Answer: C
56. In fusion splicing of the fibers, the arc that occurs
between the two electrodes is about ________ with an adjustable
current up to _________
A. 7,000 volts; 25 mAB. 10,000 volts; 125 mA
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C. 1,000 volts; 251 mAD. 70,000 volts; 125 mA
Answer: A
57. Violet color in fiber optics represents what fiber
number?
A. 9B. 10C. 11D. 12
Answer: B
