Analog Communications Multiple Choice Questions focuses on “Baseband Channel”.
1. If we compared to the core, the index of refraction of cladding must be ________
a) same
b) greater
c) less
d) infinite
Answer: c
Clarification: Core of a optical fiber is a cylinder of glass or plastic that runs along the fiber’s length. The core is surrounded by a medium with a lower index of refraction, called cladding.
2. What is used in making single-mode fiber?
a) plastic
b) glass
c) copper
d) aluminium
Answer: b
Clarification: Single mode fiber is usually made up of glass. Single-mode fiber is designed to carry light directly down the fiber.
3. A single-mode cable does not suffer from?
a) chromatic dispersion
b) waveguide dispersion
c) modal dispersion
d) material dispersion
Answer: c
Clarification: Modal dispersion can’t be seen in a single mode cable. It is used for transmission of a single ray.
4. ISI stands for ________
a) Inter Symbol Interference
b) Inter Signal Interference
c) Inter System Interference
d) Inter Sound Interference
Answer: a
Clarification: ISI stands for Inter Symbol Interference. It is a form of distortion of a signal in which one symbol gets interfered with different signals.
5. FDDI stands for __________
a) Fiber Digital Data Interface
b) Fiber Digital Delay Interface
c) Fiber Distributed Data Interface
d) Fiber Distributed Delay Interface
Answer: c
Clarification: FDDI stands for Fiber Distributed Data Interface. It is used for data transmission on optical fiber lines in a LAN that can also extend in range upto 200km. LAN is a local area network that connects various devices belonging to the same network.
6. What you understand by the term Soliton?
a) it is a defect in the glass
b) it is a type of particle
c) it is a type of pulse
d) it is a type of optical fibre
Answer: c
Clarification: Soliton is a self-reinforcing solitary wave packet that maintains its shape, when it propagates with a constant velocity. So, it is a type of pulse only.
7. Signal to noise ratio is calculated as signal voltage divided by noise voltage.
a) True
b) False
Answer: b
Clarification: Signal to Noise ratio is the measure of signal present with respect to the surrounding noise. Signal to noise ratio is calculated as signal power divided by noise power.
8. Which statement is true about varacter?
a) it is a diode
b) it is a voltage-controlled oscillator
c) it is used in tuned circuits
d) it is a diode used in tuned circuit and also has a voltage-controlled capacitor
Answer: d
Clarification: Varacter is a diode used in communication for tuning the circuit. It is also known as voltage controlled capacitor (VCC).
9. A frequency synthesizer is _________
a) A VCO phase locked to a reference frequency
b) A VFO phase locked to a reference frequency
c) A fixed RF generator
d) A variable RF generator
Answer: a
Clarification: Frequency synthesizer generates a range of frequencies from a single reference frequency.
10. Why CSMA/CD network has a minimum length for packets?
a) to increase the data rate
b) to decrease the data rate
c) to prevent packets from reaching all other nodes
d) to make sure that all other nodes hear a collision in progress
Answer: d
Clarification: CSMA/CD is a media access control used in early Ethernet technology for local area networking. Its packets has less length when compared to others to make sure that all other nodes hear a collision in progress.
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