InterviewSolution

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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.	If we compared to the core, the index of refraction of cladding must be ________(a) same(b) greater(c) less(d) infiniteI got this question in an online quiz.My question is from Baseband Channel topic in portion Baseband Data Transmission of Analog Communications
Answer» Right answer is (C) less To ELABORATE: 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) aluminiumThe question was posed to me by my college director while I was bunking the class.Query is from Baseband Channel topic in section Baseband Data Transmission of Analog Communications
Answer» Right answer is (b) GLASS To EXPLAIN: 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 dispersionThis question was addressed to me in an interview.This question is from Baseband Channel topic in section Baseband Data Transmission of Analog Communications
Answer» The correct option is (c) MODAL dispersion For EXPLANATION I would SAY: 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 InterferenceThis question was addressed to me during a job interview.This interesting question is from Baseband Channel topic in section Baseband Data Transmission of Analog Communications
Answer» Correct CHOICE is (a) Inter Symbol INTERFERENCE To explain I would say: 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 InterfaceI got this question during an online exam.This intriguing question originated from Baseband Channel topic in chapter Baseband Data Transmission of Analog Communications
Answer» Right choice is (c) Fiber Distributed Data INTERFACE Easy explanation: 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 fibreI had been asked this question during an interview.Asked question is from Baseband Channel topic in portion Baseband Data Transmission of Analog Communications
Answer» RIGHT answer is (C) it is a type of pulse Easy explanation: 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) FalseThis question was posed to me during a job interview.This intriguing question originated from Baseband Channel topic in section Baseband Data Transmission of Analog Communications
Answer» Right ANSWER is (B) False Explanation: 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.	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 progressThe question was asked in semester exam.Origin of the question is Baseband Channel topic in portion Baseband Data Transmission of Analog Communications
Answer» Right choice is (d) to MAKE sure that all other nodes hear a collision in progress The explanation: 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.

9.	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 capacitorThe question was asked during an interview.The origin of the question is Baseband Channel in chapter Baseband Data Transmission of Analog Communications
Answer» The correct option is (d) it is a diode used in tuned circuit and also has a voltage-CONTROLLED CAPACITOR Explanation: Varacter is a diode used in COMMUNICATION for tuning the circuit. It is also known as voltage controlled capacitor (VCC).

10.	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 generatorThis question was posed to me during an interview.My doubt stems from Baseband Channel in portion Baseband Data Transmission of Analog Communications
Answer» Correct choice is (a) A VCO phase LOCKED to a reference frequency Explanation: Frequency SYNTHESIZER generates a RANGE of frequencies from a single reference frequency.

11.	Radians per second is equal to _________(a) 2πf(b) phase angle(c) phase deviation(d) phase swingI had been asked this question by my college director while I was bunking the class.My doubt is from Intersymbol Interference topic in portion Baseband Data Transmission of Analog Communications
Answer» Right CHOICE is (a) 2πf To elaborate: Radians per second is equal to the VALUE 2πf.

12.	What is the full-form of UTP?(a) Unshielded Twisted-Pair copper wire(b) Unshielded Twisted-Pair Coaxial wire(c) Uniquely Twisted-Pair copper wire(d) Uniquely Twisted-Pair Coaxial wireI had been asked this question in an interview for internship.My question comes from Intersymbol Interference topic in chapter Baseband Data Transmission of Analog Communications
Answer» CORRECT ANSWER is (a) Unshielded Twisted-Pair copper wire The BEST explanation: UTP stands for Unshielded Twisted-Pair copper wire. Unshielded in UTP refers to the LACK of metallic shielding around copper wires. The twisted pair helps to minimize ELECTRONIC interference.

13.	NIC stands for ________(a) Network Interface Card(b) Network Interface Cable(c) Network Interface Code(d) Network Internal CordThe question was posed to me in an interview.Question is from Intersymbol Interference topic in division Baseband Data Transmission of Analog Communications
Answer» Correct option is (a) Network INTERFACE Card For EXPLANATION I WOULD say: NIC stands for Network Interface Card. It is a computer circuit board that is installed in a computer so that it can be CONNECTED to a network.

14.	Why CSMA/CD network has a maximum length for cables?(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 progressThe question was asked by my college professor while I was bunking the class.Question is from Intersymbol Interference in division Baseband Data Transmission of Analog Communications
Answer» Correct choice is (d) to make SURE that all other NODES hear a collision in PROGRESS To explain: CSMA/CD is a media access control used in early Ethernet TECHNOLOGY for local area networking. Cables used in CSMA/CD has a maximum length when compared to OTHERS to make sure that all other nodes hear a collision in progress.

15.	The Clapp oscillator is _________(a) an oscillator made using FET(b) a type of crystal controlled oscillators(c) modified form of Colpitts oscillator(d) modified form of Hartley oscillatorThis question was addressed to me during an online exam.Question is from Intersymbol Interference topic in chapter Baseband Data Transmission of Analog Communications
Answer» The CORRECT choice is (c) modified form of COLPITTS OSCILLATOR The best explanation: CLAPP oscillator is just an advanced form of Colpitts oscillator.

16.	What is the total voltage, when two noise voltage V1 and V2 are combined?(a) \(\sqrt{V_1 \times V_1 + V_2 \times V_2}\)(b) \(\frac{V_1 + V_2}{2}\)(c) \(\sqrt{V_1 \times V_2}\)(d) V1 + V2The question was asked in a national level competition.The question is from Intersymbol Interference in division Baseband Data Transmission of Analog Communications
Answer» RIGHT option is (a) \(\sqrt{V_1 \TIMES V_1 + V_2 \times V_2}\) The explanation: When two NOISE voltage V1 and V2 are combined, the resulting total voltage VT comes out to be \(\sqrt{V_1 \times V_1 + V_2 \times V_2}\).

17.	Shot noise is generated in ________(a) resistors(b) inductors(c) transistors and diodes(d) capacitorsI have been asked this question in an interview.I'm obligated to ask this question of Intersymbol Interference topic in portion Baseband Data Transmission of Analog Communications
Answer» The CORRECT CHOICE is (c) transistors and diodes Explanation: SHOT noise originate from the discrete nature of electric CHARGE. It is mostly generated in transistors and diodes.

18.	Repeaters are not required for fiber optic cable lengths upto ________(a) 10km(b) 100km(c) 5km(d) 12kmI got this question in an international level competition.My query is from Intersymbol Interference topic in division Baseband Data Transmission of Analog Communications
Answer» The correct CHOICE is (b) 100km The best I can explain: Repeaters are devices which HELP in retransmitting a signal more powerfully. If the LENGTH of fiber optic cable is up to 100 km, there is no NEED for repeaters in that circuit.