1.
) Fiber optic communication works on the principle of
a) Seebeck effect
b) Piezoelectric effect
c) Total internal reflection
d) Refraction
Ans. Total internal reflection
2.) Fiber optic cables are
a) Stronger
b) More efficient
c) Less costly
d) All of these
Ans. All of these
3.) Which of the following is not an advantage of optic fiber cable
a) Large number of repeaters
b) Higher bandwidth
c) High security
d) Less signal attenuation
Ans. Large number of repeaters
4.) Fiber core diameter is
a) 10-20micron
b) 50-100 micron
c) 50-200 micron
d) 10-100 micron
Ans. 10-100 micron
5.) Fiber cladding diameter is
a) 100-200 micron
b) 125-500 micron
c) 150-300 micron
d) 200-400 micron
Ans. 125-500 micron
6.) What is the numerical aperture of optic fiber cable
a) 0.1 to 0.4
b) 0.2 to 0.4
c) 0.3 to 0.5
d) 0.4 to 0.5
Ans. 0.1 to 0.4
7.) Spreading of light signal in time is called
a) Dispersion
b) Scattering
c) Attenuation
d) Splicing
Ans. Dispersion
8.) What is the other name for maximum incident angle
a) Incident angle
b) Reflected angle
c) Refraction angle
d) Acceptance angle
Ans. Acceptance angle
9.) Which of the following suffers maximum distortion
a) Single mode fiber
b) Multimode step index fiber
c) Multimode graded index fiber
d) None of these
Ans. Multimode step index fiber
10.) Reduction in strength of light signal during its journey through fiber optic cable is called
a) Refraction
b) Attenuation
c) Splicing
d) Dispersion
Ans. Attenuation
11.) Identify the type of optic fiber cable in the figure
a) Single mode fiber
b) Multimode step index fiber
c) Multimode graded index fiber
d) None of these
Ans. Multimode graded index fiber
12.) Identify the type of optic fiber cable in the figure
a) Single mode fiber
b) Multimode step index fiber
c) Multimode graded index fiber
d) None of these
Ans. Multimode step index fiber
13.) The source of light for optic fiber transmission is
a) LED
b) PIN diode
c) Avalanche diode
d) Mercury lamp
Ans. LED/LASER
14.) Material for manufacture of optic fiber cable
a) Wood
b) Silicon
c) Glass
d) Aluminum
Ans. Glass
15.) Fiber cable used for “Fiber to Home” installations are
a) Singlemode fiber
b) Multimode step index fiber
c) Multimode graded index fiber
d) Coaxial cable
Ans. Single mode fiber
16.) Which of the following is used as receiver for optic fiber communication
a) Varactor diode
b) Photodiode
c) LDR
d) LED
Ans. Photodiode
17.) Multimode step index fiber has
a) Large core diameter and large numerical aperture
b) Large core diameter and small numerical aperture
c) Small core diameter and large numerical aperture
d) Small core diameter and small numerical aperture
Ans. Large core diameter and large numerical aperture
18.) Single mode fibers allow single mode propagation; the cladding diameter must be at least
___________
a) Twice the core diameter
b) Thrice the core diameter
c) Five times the core diameter
d) Ten times the core diameter
Ans. Ten times the core diameter
19.) Multimode step index fibers have a bandwidth of ___________
a) 2 to 30 MHz km
b) 6 to 50 MHz km
c) 10 to 40 MHz km
d) 8 to 40 MHz km
Ans. 6 to 50 MHz km
20.) Multimode graded index fibers are manufactured from materials with ___________
a) Lower purity
b) Higher purity than multimode step index fibers.
c) No impurity
d) Impurity as same as multimode step index fibers.
Ans. Higher purity than multimode step index fibers.
21.) The performance characteristics of multimode graded index fibers are ___________
a) Better than multimode step index fibers
b) Same as multimode step index fibers
c) Lesser than multimode step index fibers
d) Negligible
Ans. Better than multimode step index fibers
22.) Multimode graded index fibers have overall buffer jackets same as multimode step index fibers but
have core diameters ___________
a) Larger than multimode step index fibers
b) Smaller than multimode step index fibers
c) Same as that of multimode step index fibers
d) Smaller than single mode step index fibers
Ans. Smaller than multimode step index fibers
23.) In optical fiber, the outer layer is _________ and inner layer is ________________ .
a) core, cladding
b) cladding, core
c) transmit, reflect
d) reflect, transmit
Ans. cladding, core
24.) Optical fiber cables are highly immune to EMI(electromagnetic interference) because information is
carried by:
a) light
b) electrical means
c) magnetic means
d) acoustic means
Ans: light
25.) _________ is a guided medium.
a) Microwave
b) Radio
c) Fiber optic cable
d) Atmosphere
Ans. Fiber optic cable
