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Q1: Bandwidth of Optical Fibre is
6Khz
20Khz
10Khz
5Khz
Unlimitted
Q2: PCS stands for
Personal Communication Systems
Personal Communication Services
Previous Communication Services
Present Communication Services
Q3: Snell s law relates
Light refraction
Light Absorption
Light relfection
Light transmission
Q4: Human laser was developed by A. Javen at Bell laboratory
1964
1964
1962
1960
Q5: Planck’s constant
6.62×10-34 Cal.sec
6.62×10-34 J.min
6.62×10-34 Cal.min
6.62×10-34 J.sec
Q6: Sum of these is unity
Reflectivity + Refractivity
Any
Reflectivity + Refractivity + Transmitivity
Reflectivity
Q7: Metals can the light beams.
Refract
Transmit
Any
Reflect
Q8: When would optical fibers be used in an Ethernet-type LAN?
“Routinely, the standard allows for optical fiber”
Always
Never
When transmission speeds exeed 50 Mbit/s
Q9: The ultrapure glass used to manufacture optical fibers is approximately ___pure
99.9999
99.99
99.9
99.999
Q10: What is the typical wavelength of light emitted from epitaxially grown LEDs
990
320
940
840
Q11: “When the angle of incidence is _______ the critical angle, the light beam bends along the interface.”
equal to
more than
less than
none of the above
Q12: Signals with a frequency between 2 MHz and 30 MHz use ______ propagation.
none of the above
line-of-sight
sky
ground
Q13: Type of lasers that use organic dyes enclosed in glass tube for an active medium.
plasma lasers
liquid lasers
ruby lasers
neon lasers
Q14: Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle?
Zero
less than
Equal
Greater than
Q15: The core of a fiber-optic cable is made of
diamond
Glass
Air
Quartz
Q16: ________ cable consists of two insulated copper wires twisted together.
Twisted-pair
Fiber-optic
Coaxial
none of the above
Q17: __________ consists of a central conductor and a shield.
Twisted-pair
none of the above
Coaxial
Fiber-optic
Q18: The main benefit of light wave communications over microwaves or any other communications media are
lower cost
freedom from interface
wider bandwidth
better security
Q19: Which of the following is not a part of the optical spectrum
Visible color
X-ray
Infrared
Ultraviolet
Q20: The term power budgeting refers to
“the cost of cable, connectors, equipment and installation”
the loss of power due to defective components
the total power available minus the attenuation losses
the comparative costs of fiber and copper installations
Q21: Which of the following cables will have the highest launch power capability
85/125/0.275
100/140/0.3
50/125/0.2
62.5/125/0.275
Q22: “Under normal condition, a single fiber should not be used for a two-way communication mainly because of”
noise
Attenuation
fading
loss
Q23: A single mode optical fiber has a core diameter of _____ nm.
0.05
0.1
0.01
0.2
Q24: The ratio of the speed of light in a vacuum and the speed of light in the material used.
S/N ratio
Refractive index
Intermodal dispersion
Monomode ratio
Q25: A function of an optic isolator
Amplifies signal transmitted
All
Cancels reflective waves
Filters unnecessary signals
Q26: Light traveling in optical fiber follows which of the following principles.
Huygen s principle
Light theory
Snells Law
Reflection theory
Q27: The bandwidth of a fiber is limited by
frequency
Dispersion
Wavelength
Mode
Q28: The _____ of a detector is the fraction of incident photons that produce a photoelectron or electron-hole pair
Aperture
quantum theory
Photon efficiency
Responsitivity
Q29: “In an optical fiber, the light is transmitted through the”
Jacket
Cladding
Buffer
Core
Q30: Rays of light transmitted in multimode fiber are called
Reflections
Refractions
Modes
Waves
Q31: Which of the cable length has the highest attenuation
1KM
2 km
95 feet
5500 Feet
Q32: “Medium 1 is a glass (n1 = 1.5) and medium 2 is an ethyl alcohol (n2 = 1.36). For an angle of incidence of 30 degrees, determine the angle of refraction.”
33.47
14.56
75
44.5
Q33: Infrared light has a wavelength that is
more than 700 nm
less than 400 nm
a little over 400 nm
less than 700 nm
Q34: “In fiber optics, the signal source is ______waves”
Radio
Very low Infrared
Infrared
Light
Q35: The operation of the fiber-optic cable is based on the principle of
Reflection
Absorbtion
Dispersion
Refraction
Q36: Which of the following is not a common application of fiber-optic cable
Computer networks
Long-distance telephone systems
Closed circuit TV
Consumer TV
Q37: “If a noisy channel has a bandwidth of 4 MHz with signal to noise ratio of about 1, what would be the maximum capacity of the channel ”
8Mb/Sec
2Mb/Sec
6Mb/Sec
4Mb/Sec
Q38: “For a sine wave, the frequency is represented by the cycles per ______ ”
None
minute
second
Hour
Q39: What type of optical fiber would best be used in the Multiple Channel Architechture (MCA)
none of the above
Step
Graded
Refractive
Q40: Speeds of laboratory fiber optic Local Area Networks are now in the range of
Gigabits/s
10Mbits/s
Hundreds of Mbits/s
1Mbits/s