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Free download in PDF Optical Fiber Communication Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Which rays exhibit the variation in the light acceptability ability of the fiber?
[A]
Meridional
[B]
Skew
[C]
Leaky
[D]
All of the above
(22)
Which is the transmission medium for VLF electromagnetic waves especially applicable for aeronautical and submarine cables?
[A]
Paired wires
[B]
Coaxial cable
[C]
Waveguide
[D]
Wireless
(23)
In the structure of a fiber, which component provides additional strength and prevents the fiber from any damage?
[A]
Core
[B]
Cladding
[C]
Buffer Coating
[D]
None of the above
(24)
In the structure of fiber, the light is guided through the core due to total internal ______
[A]
reflection
[B]
refraction
[C]
diffraction
[D]
dispersion
(25)
Which line code in PCM indicates the return of signal to zero between each pulse & takes place even due to occurrence of consecutive 0’s & 1’s in the signal?
[A]
Return-to-zero (RZ)
[B]
Non-Return to zero space
[C]
Return to zero inverted
[D]
Non-return to zero inverted
Answer: Return-to-zero (RZ)
(26)
In fiber fault location, the equation of length (l) for time difference (t) is expressed as L = ct / 2n1 . Which factor in this equation implies that the light travels a length from source to break point and then through another length on the return trip?
(27)
From the tests carried out in fiber characterization, which among the following measures the total light reflected back to the transmitter caused by the fiber as well as the components like connector pairs and mechanical splices?
[A]
ORL
[B]
OTDR
[C]
LTS
[D]
PMD
(28)
Which among the following is/are determined by the fiber characterization?
[A]
Fiber integrity & performance for desired transmission rate
[B]
Installation practices
[C]
Service Implementation
[D]
All of the above
(29)
Speckle pattern is generated due to interference of nodes from a coherent source especially when the coherence time of source is _________ the intermodal dispersion time in the fiber.
[A]
Less than
[B]
Greater than
[C]
Equal to
[D]
None of the above
(30)
Which phenomenon causes the dynamic line width broadening under the direct modulation of injection current?
[A]
Modal Noise
[B]
Mode-partition Noise
[C]
Frequency Chirping
[D]
Reflection Noise
Answer: Frequency Chirping
31
Which method determines the dispersion limitation of an optical link?
[A]
Link power budget
[B]
Rise time budget
[C]
Both a and b
[D]
None of the above
32
Which feature of an eye-diagram assists in the measurement of additive noise in the signal?
[A]
Eye opening (height, peak to peak)
[B]
Eye overshoot/ undershoot
[C]
Eye width
[D]
None of the above
Answer: Eye opening (height, peak to peak)
33
In digital receivers, which codes are used to designate the sampled analog signals after their quantization into discrete levels?
[A]
Binary
[B]
Decimal
[C]
ASCII
[D]
Excess-3
34
Which component of an optical receiver is a linear frequency shaping filter used for the compensation of signal distortion and Inter Symbol Interference (ISI)?
[A]
Photodetector
[B]
Amplifier
[C]
Equalizer
[D]
None of the above
35
For a photo-diode with responsivity of 0.50 A/W & optical power of about 12μW, what would be the value of generated photocurrent?
[A]
3 μA
[B]
6 μA
[C]
9 μA
[D]
12 μA
36
Which among the following results in the removal of LED lens interface for achieving high coupling efficiency?
[A]
Spherical lens
[B]
Cylindrical lens
[C]
Integral lens LED
[D]
All of the above
Answer: Integral lens LED
37
While coupling of LEDs with fiber, on which factor/s does the size of source and lighting angle generated within the semiconductor depend/s?
[A]
Geometry of die
[B]
Refractive index of semiconductor
[C]
Encapsulation Medium
[D]
All of the above
38
Which among the following is a key process adopted for the laser beam formation as it undergoes the light amplification?
[A]
Spontaneous Emission
[B]
Stimulated Emission
[C]
Both a and b
[D]
None of the above
Answer: Stimulated Emission
39
In spontaneous emission, the light source in an excited state undergoes the transition to a state with _______
[A]
Higher energy
[B]
Moderate energy
[C]
Lower energy
[D]
All of the above
40
In the fiber optic link, power transfer from one fiber to another and from fiber to detector must take place with _________coupling efficiency.
[A]
maximum
[B]
stable
[C]
minimum
[D]
unpredictable
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